Carburetor Tuning For Fuel Economy

The shape and design of the piston domes are specifically designed to push atomized fuel and air around the spark plug. Air Fuel Tuning (A/F Tuning) Programming ECU settings for a optimul A/F Ratio * Your target AFR should be around 14. Ford FE Engine Fuel Systems: The Ultimate Guide The fuel system used on the Ford FE engines was generally conventional throughout its years of production. Refer to #3 if fuel has been allowed to sit in a carburetor for extended periods of time. Better fuel atomization leads to higher top-end horsepower. The Volkswagen Club of South Africa The Volkswagen Club of South Africa Tips to increase fuel economy on Vw Citi chico 1. You just have to fish your jets in and out of the fuel bowls. Power increases can be significant—anywhere from 20 to 100 horsepower—and some programmers have a fuel economy setting that can increase mileage by two to. The Power Valve circuit needs to have its flow increased also to bring the primary up to about 35% at WOT. Mills Beam had his super-mileage carburetor bought out in the 1920s. It's the "chemically ideal" where there is no excess fuel or oxygen left after combustion. Fuel will not reach the carburetor if the fuel valve is closed. NOTE - I've found the following EFI tables to be the most significant areas for improving fuel economy: Target Air/Fuel Ratio Table (too rich in cruising area). However, sometimes a little more fine-tuning is needed because the customer has a. If the engine is equipped with a fuel pump, make sure it operates properly. Debris in the carburetor often causes performance problems. That's not so bad I guess but I would rather it be in the mid 15s so my fuel economy would improve. Fuel injected models may have perfect AFR curves but still suffer mid-range torque loss without optimized exhaust tuning. distributor is dead center for adjustment. They can improve performance by modifying the computer’s fuel and timing calibrations; just hook one up to your vehicle’s diagnostic port, choose a tuning level, and press a button. Asked in Carburetors, Fuel Economy and Mileage, Personal then back then out 2 1/2 turns,Fine tune from there,For best idle. What Is The Most Fuel Efficient Carburetor Between Edelbroock And Holley I am interested in buying a new carburator for my chevy truck, but I want the most fuel efficient carburator between these two brands. Connect hose to fuel line and run into metal container. Quick Fuel offers 11 different mechanical-secondary carburetors in its SS series ranging from 650 to 850 CFM. If the edger is not operating as it should or you're not getting good fuel economy, there are some things you can generally do to tune most carburetors without taking them to a repair facility. Carburetor and Choke Cleaner helps dissolve gum, varnish, dirt and carbon deposits. Re: Uno 999cc or 45 carb tuning querie Originally Posted by beat After having a lot of issues with my Carb, i decided to get all the bits(UT intake, fuel rail with the standard injectors, modified pacer tank, management system) and i Fuel injected my car. The basic goal is to tune the fuel/air screw to give you an optimal air-fuel mixture. Quadratec also carries a wide variety of replacement engine and fuel system parts such as fuel tanks, pumps, oil pans, belts, cables, gaskets, and hardware for those just looking to repair or replace stock components and keep their vehicle running. The Single Barrel Carb version had better fuel economy then the mpfi. Now my question: is there any benefit in the annular boosters when cruising on the street. Call us at 02 6332 2233 or email us at [email protected] then allows more fuel in as the carburetor needs it. Poor fuel mileage is another sign of an over-rich condition. Getting The Basics. Debris in the carburetor often causes performance problems. The fuel bowl is part of the Performer carb body so there is no fuel spillage. There are "two stage" power valves available that are more for "economy" minded users rather than "performance" enthusiasts. The bike ran excellently, but very rich, fuel economy was 36 to 38 MPG, pipe and plugs were a velvetly, sooty black. NOTE - I've found the following EFI tables to be the most significant areas for improving fuel economy: Target Air/Fuel Ratio Table (too rich in cruising area). Short of getting the family to push the car everywhere there are actually a few mods that can be done to improve fuel economy. Tuning Your Carburetor For Optimal Performance And Fuel Efficicency May be the following will help you in tuning your mean machine for optimal power delivery and best fuel economy. TBI, or Throttle Body Injection, is a nomenclature that specifies a particular method of metering air and fuel in a marine engine. I have been running dual, Carter W-1s for a couple years now. The car ran 12. Several Audi, Seat, Skoda and VW model series with 2. This information-packed guide provides a detailed view of basic carburetor functioning, modifying for performance applications, custom-tuning for street, racing, off-road, turbocharging, economy, and other special uses. See also "Fueling Up With Ethanol" and the Fuel Economy Center. Hold the hose up against the carb bowl and check the fuel level. Tweaking the carburetor will so ensure fuel economy. This makes it both a valuable fuel efficiency indicator and one more useful tool in gauging an engine's state-of-tune. The 1405 is set from the factory for performance vehicles. As for fuel economy the EFI is better. But Moore expected to have to add bypass holes to the new carburetor. Find all the details inside Chevy High Performance Magazine. But if you're chasing maximum power, or particularly when you make any sort of exhaust or other engine modification, the Nikki will restrict the engine's airflow. AeroConversions is a product line of high-quality powerplants, systems and parts for use in recreational aviation. The throttle bodies have a 1. I was thinking of taking the choke off the front carb. When the float drops below a certain level due to fuel expenditure, it will open a valve that refills the chamber with fuel. However, off-standard centrifugal and vacuum timing negatively impacts engine power and fuel economy. The carburetor combines fuel and air in the engine by using an intake vacuum supply. Being able to precisely control the air/fuel mixture, they allowed engineers to fine tune the engine to both meet tough emissions standards and offer increased power output. Over-advanced timing may not only damage engine components, but may also negatively impact fuel economy. In the Mikuni specific jets meter fuel for various throttle openings. After reinstalling everything, take your car for a test drive. Does such a carburetor really exist?. Hi, forman, always great to see your posts and topics! The 4. That being said I don’t know of any companies offering those modifications for your specific vehicle. but better for fuel economy in a street car. The car ran 12. TBI fuel injection is a type of fuel injection system where the fuel is injected into the throttle body. This information-packed guide provides a detailed view of basic carburetor functioning, modifying for performance applications, custom-tuning for street, racing, off-road, turbocharging, economy, and other special uses. Based on these signals, a computer decides the best fuel / air mixture for the engine. Because there are so many manufacturers, there is no one way to tune the carburetor. If your engine does not have sufficient compression or timing, some (or a lot) of the fuel will go unburned. TBI, or Throttle Body Injection, is a nomenclature that specifies a particular method of metering air and fuel in a marine engine. I have them both set up like this: 270 main jet 55 pilot 0. I’ve run chainsaws for over 30 years and never knew to how adjust the carburetor. Part of 1 of 1: Adjusting your carburetor. Carburetor Parts. Gumout ® High Mileage Fuel Injector Cleaner is specially formulated to remove carbon deposits from engines with over 75,000 miles for restored engine performance and fuel economy. 2) If indeed you have enough fuel to stay off the mains, but still have low economy at cruise, you have either too large an idle fuel jet, or too small an idle air jet. A carburetor will have an air screw or a fuel screw, one or the other but never both. Fuel injection meters the fuel much more precisely than the carburetor. See also "Fueling Up With Ethanol" and the Fuel Economy Center. A single inlet to a carb with a transfer-tube delivering fuel to the secondary fuel bowl can have problems feeding enough fuel for larger cubic inch performance applications sustaining high-RPM for longer periods of time. The "dual" or double barrel carburetor is so named because of its construction. Experience noticeable gains in torque and better acceleration. We check out GM Performance Part's 502ci fuel injected crate engine using Holly's bolt on fuel injection kit! Check out all the details in Off-Road Magazine!. I pulled the carb and found the 150 jet, stock needle, and figured I would take a step down to a 142. The accelerator pump can be adjusted to inject fuel into the throat of the carburetor over a wide range of throttle openings. With the rising price of fuel one question TorqueCars frequently gets asked is how can a car be tuned for maximum economy. I have heard the setup is very streetable, especially being able to run on the rear carb only for putting around. BEST TUNING METHODS. Does anybody have experience tuning these things. The carburetor meters fuel only by mechanical linkage and engine manifold vacuum. Over my other set-ups I have run before, this one is by far the best on mileage. Air Fuel Tuning (A/F Tuning) Programming ECU settings for a optimul A/F Ratio * Your target AFR should be around 14. If your engine is running too rough, it's important to adjust the mixture and find the correct idling speed to decrease engine. Poor fuel mileage is another sign of an over-rich condition. au for more information or a quote. Understnding how to turn the screws on a carburetor will make your bracket car deadly accurate, or help make a heads-up car perform at its peak. Open the fuel valve (if equipped), located at the base of the fuel tank where the fuel line is attached. 30% More Mileage on Gas, Diesel fuel, Toxic Waste Chemicals, or even Unrefined Crude Oil ! The most famous --- and most often copied --- high mileage carburetor in history. If you have large main fuel jets for good power at higher RPMs, you will find more fuel economy at lower RPMs by staying off the mains, and on the progression holes. This guide aims at tuning the fuel/air screw to give you an optimal air-fuel mixture. As for fuel economy the EFI is better. This will give you more power as well as greater fuel mileage. Edelbrock Performer series carburetors are extremely popular, low maintenance carburetors that have a variety of applications both for street and strip use. Original blueprints for 200 mpg carburetor found in England. An Easy Fuel-Injection Option for Your Engine and some are better than others in the dirt if you know how to tune them, but no carburetor will give you the hiccup-free, run-at-any-angle. My guess would be the 351 would win the drag race, the 302 would be more fuel efficient and smoother in normal driving, the 351 will sound better on full throttle. Combining. I have this model, but fuel economy in city is 9 km/L and on short distance like 40 km rout, its economy is 11 km/L with A/C, my technician says that its carburetor is japan make, so replace it with carburetor of local pakistani assembled khyber, it fuel average will increased upto 15 to 17 km/L, but i dont believe him. This is a low pressure fuel system, many of which have fuel. In the late 1960s, he worked out a catalytic vegetable compound that produced the same super-mileage results. So I bought a new carburetor for my 4ac motor. As you can imagine that test procedure is not exactly a user-friendly way to go about tuning a Holleyequipped engine for economy. The Carburetor Enhancer is not actually a device, it is a custom tuning technique for carburetors. 7:1 is the stoichiometric ratio. 5 in the very same configuration. Now, I have a different technique in tuning my carb, after I take my scooter for a ride, I will then park it and put the center stand on, turn the engine on. Does this mean that carbs are only best suited for maximum performance use, where fuel economy and idle or part-throttle driveability is of no concern?. The Power Valve circuit needs to have its flow increased also to bring the primary up to about 35% at WOT. A carburetor will have an air screw or a fuel screw, one or the other but never both. 0 TDI engines use both CR and PD ("Pumpe-Düse" / Unit injector) technology. idle, acceleration, cruise), despite the fact that the engine demands vastly different amounts of fuel and air for different situations. Mixture tuning on your Harley Davidson CV carburetor is a simple procedure that can easily be performed with basic tools. T4 will remove your base-plate, rear fuel bowl & metering block. Hi, forman, always great to see your posts and topics! The 4. Carburetor or fuel injection?. One such item was chainsaw maintenance, and one part of that was the carburetor test. Drill out needed new passages, tap threads into rear metering block. I often leave them on as they fine tune an air/fuel mixture just perfect. Carbon buildup from combustion can clog fuel injectors and carburetors, limiting the amount of fuel that reaches the engine. The difference in air pressure between the throat and the outside air causes fuel to flow into the carburetor through any orifice it can find. From here, the fuel and air form a combustible mixture that powers the engine. Electronic fuel injection uses signals from several sensors located on the engine. Again, SUs take a different tack. Bypass screw which adjusts the idle speed. Extension spray tube is included for those hard to reach areas. See also "Fueling Up With Ethanol" and the Fuel Economy Center. "You should sell the. The majority of current Yamaha Banshee owners surveyed wanted a conversion kit that was cheap, easy to use and offered an increase in both power and fuel economy. Annular discharge-equipped carburetors can also run smaller jets, because they are more fuel-efficient and are all the rage with performance carburetors used in NASCAR and other racing divisions. If this manual is not fully understood,. Carter AFB carburetors are nearly identical, that. distributor is dead center for adjustment. How To Tune Holley Carburetors. The SU is a constant velocity carb. idle, acceleration, cruise), despite the fact that the engine demands vastly different amounts of fuel and air for different situations. Can’t tell which would be faster, 302 w EFI, or 351 w a carb. I have taken everything out of the gas tank and installed a hose that extends to the bottom of the tank. *Based on fuel savings information found at fueleconomy. An optimal mixture gets maximum performance from your machine. Lectron is celebrating 45 years of helping riders get the most from their vehicles with our high performance carburetors and EFI. I can buy a new base plate which has the EZ-Idle circuit ($150) rebuild the carb and persue idle air bleed tuning or possibly buy a new carb The new carbs I was looking at were: Quick Fuel Q Series (Q-750) Holley 4150 HP Series (0-80528-1). Chevy High Performance tech article on how to get more mileage from your carburetor by using efi tuning techniques. The kit offers a wide range of tuning options for the CV carb. This article shows you how to adjust the air fuel mixture and the idle air speed - the two most common adjustments made when tuning a carburetor. May be the following will help you in tuning your mean machine for optimal power delivery and best fuel economy. Electronic fuel injection uses signals from several sensors located on the engine. Holley's base calibrations are not designed for good fuel economy. This guide will help you in tuning your motorbike for optimal power delivery and best fuel economy. Poor fuel mileage is another sign of an over-rich condition. Getting The Basics. Gumout ® High Mileage Fuel Injector Cleaner is specially formulated to remove carbon deposits from engines with over 75,000 miles for restored engine performance and fuel economy. The air is pulled down through to the carburetor by the intake vacuum while fuel is siphoned from the carburetor’s fuel bowl. Carburetor and Fuel System Troubleshooting Guide. the back lower screw was turned all the way right and then half way turned. The rest of the tuning parameters are set up at the factory and are tailored to the user’s specific make and model of engine. The first Fish carburetor was hand-built in 1933 and tested by Ford Motor Co 1934. Fuel injection meters the fuel much more precisely than the carburetor. ) Time and tune the car with a vacuum gage, and timing light. For years, we’ve been using oxygen sensors as a tuning aid, hooked up to one of many aftermarket display gizmos that convert the sensor’s voltage to a comprehensible reading. On some models the pilot air jet is changed to provide optimum fuel economy. It actually idles, and doesn't knock off like 99% of the carburetor setups you'll see. Simple carburetor is more suitable for engine running at constant speed. When the float drops below a certain level due to fuel expenditure, it will open a valve that refills the chamber with fuel. Make small and careful adjustments and remeasure. The large touring models typically deliver about five miles per gallon less. This is a home brewed tune-up procedure written in layman's terms for the do-it-yourself mechanic with a limited tool inventory. Carbs run fine and technically mix the fuel better than TBI. As you can imagine that test procedure is not exactly a user-friendly way to go about tuning a Holleyequipped engine for economy. If you have a new saw, this won’t apply to you, as new regulations require saws to be built so that only a qualified technician can tune the carburetor. This de-tuning has caused diesels to loose several mileage per gallon over the years. Try and keep your RPMs under 2K and you have done the proper tune-up on the whole engine, (plugs, wires, etc, etc. Volume screw which adjusts the idle mixture. Depending on the carburetor, it will depend on where we can find the air/fuel screw. This is a low pressure fuel system, many of which have fuel. Fuel Line; Fuel. The Volkswagen Club of South Africa The Volkswagen Club of South Africa Tips to increase fuel economy on Vw Citi chico 1. A mixture which is too rich, meaning the mixture does not have the proper quantity of air, can result in fouled sparkplugs and poor gas mileage. The emergence of fuel injected motorcycles in the late 90’s required a different standard of tuning than a carburetor. Use the MANIFOLD vacuum. Does anybody have experience tuning these things. Fuel saving devices are sold on the aftermarket with claims to improve the fuel economy and/or the exhaust emissions of any purport to optimize ignition, air flow, or fuel flow in some way. How to Adjust a Carburetor. A double pumper is known for getting bad fuel milage as they go rich at part throttle. The increased fuel pressure achieved by our performance electronics improves your fuel’s burn efficiency, thereby improving fuel economy by (once again) getting more out of the fuel you use. If you have a new saw, this won’t apply to you, as new regulations require saws to be built so that only a qualified technician can tune the carburetor. If your vehicle is specified in the list of applicable models below (all other 2. If the edger is not operating as it should or you're not getting good fuel economy, there are some things you can generally do to tune most carburetors without taking them to a repair facility. This means that the speed at which air flows over the jet never varies. However, sometimes a little more fine-tuning is needed because the customer has a. Fuel mileage is good. Rathe rthan fussing aroung trying make something get mileage I would get one of the newer holley's that are calibrated for mileage. Of course if the Air/Fuel meter reads 10:1, then you are much too rich. The majority of current Yamaha Banshee owners surveyed wanted a conversion kit that was cheap, easy to use and offered an increase in both power and fuel economy. Coupled with our range of high performance and race engines developed by RPE Racing, this engines produce more power, better response and fuel economy than they were ever meant to. The carburetor is unaffected by engine backfires, which means that there are no power valves to blow out, and the rods can be changed in seconds without carburetor removal or fuel draining. 0:1 as you approach your peak boost level. Hi, forman, always great to see your posts and topics! The 4. The quick-change vacuum secondary provides fast spring changes for fuel economy or performance tuning. Short of getting the family to push the car everywhere there are actually a few mods that can be done to improve fuel economy. “Doubling the Automobile Mileage Per Gallon,” The Scientific American Digest, March 1926, page 185. This makes it both a valuable fuel efficiency indicator and one more useful tool in gauging an engine's state-of-tune. The 32/36 progressive is an excellent carb for low-end power and fuel economy. and better fuel economy. Carburetor and Choke Cleaner helps dissolve gum, varnish, dirt and carbon deposits. Finally here’s what gas companies have been hiding all these years! Now you can forget rumors – here’s reality. The jetting right now is 65 jets front and rear, Holley calls this "squared. This is a discussion on How to tune your carb properly within Motorbikes, part of the BHP India category; Read this article here, thought since 99% bikes sold in India are Carbs, this would be helpful. Several modifications have made to overcome this drawback of simple carburetor. Rather than a future technology, high mileage carburetors are inventions of the past, but unfortunately they did never make it to market. Anytime you rejet or change exhaust or air cleaner intake it is suggested to adjust the mixture. Opting for the Holley 2300 350 CFM 2-Barrel Manual Choke Carburetor makes good sense if you’re looking for fuel economy. The fuel inlet to a carburetor is slightly more complex than we've described it so far. Their findings show an. I know I read this somewhere but what does it mean when the engines is slow to return to idle speed after revved? -- *Ed J. The "dual" or double barrel carburetor is so named because of its construction. Carburetor tuning tips: Another way of figuring out your car engine's air-fuel ratio is by using a digital meter. In cold weather I use a thicker sock! Initially have socks with you when you ride, and change them around until you find the bike is at its best. When tuning, we think of each of these variables as controlling a different operating range: The primary jet size determines the fuel mixture at Wide Open Throttle (WOT). An Electronic Fuel Injection system would overcome both of these issues. Take a screwdriver and adjust slow speed mixture and idle. Ok, I have two identical sleds 2006 600 RMK's. 87 Fuel Injection vs 81-86 Carb trucks Would it get worse fuel economy (don't care honestly though). If you have large main fuel jets for good power at higher RPMs, you will find more fuel economy at lower RPMs by staying off the mains, and on the progression holes. I built a Cold air induction for my 1979 Dodge 440 RV and this mileage is up by 1. To test and make fine-tuning adjustments to this degree takes a really good dyno, a lot of time, and some very accurate fuel-flow measuring gear. Edelbrock has been delivering the best combination of dyno proven electronic fuel injection performance for over 40 years. Application Dimensions. My guess would be the 351 would win the drag race, the 302 would be more fuel efficient and smoother in normal driving, the 351 will sound better on full throttle. Any source of airflow through a carb will draw fuel. It seems to be running pretty good for the moment. The throttle body fuel injection system, or TBI as referred to by GM or CFI by Ford, works using a single or pair of injectors. Now one of them may come back to haunt the oil interests - a bit late, but nevertheless. “In reference to your reply on the ‘50 Chevrolet coupe with the poor gas mileage, other problems could be improper carburetor choke adjustment or operation, carburetor float adjustment or float replacement, carburetor main jet size. Carb is a Holley 750 vac secondary 3310 model. The carburetor combines fuel and air in the engine by using an intake vacuum supply. au for more information or a quote. A centrifugal carburetor that partially gasifies the fuel droplets and make for marked efficiency. Tuning a carburetor consists of controlling the size of those orifices so that the resulting air/fuel mixtures are correct. After years of resisting the temptation to re-write the shop manual, I am posting this by popular demand. May be the following will help you in tuning your mean machine for optimal power delivery and best fuel economy. ENGINE TUNE-UP The Casual Way - CF-120. Holley engineers have created several tuning avenues through the modular design, to create a proper air-fuel ratio pattern for just about any engine. Other benefits included smoother operation all around, such as when driving in high elevations and in very cold or hot weather. If your car has failed an emissions test or is in need of a tune-up, repairing the problem can help improve your fuel economy 4 percent on average*. Fuel injection meters the fuel much more precisely than the carburetor. In fact, modern fuel injected cars use oxygen sensors and a computer to adjust the mixture on the fly to maintain a stoichiometric ratio at low engine speeds in order to offer the best fuel economy possible. If the engine is equipped with a fuel pump, make sure it operates properly. Can an Economy Carburetor Really Save Fuel and Money? With what seems to be a never ending skyrocketing increase in fuel prices, many people are looking for ways to save both fuel and money. Find out how fuel-injection systems work and about the various configurations used in the cars today. But, once you know how power-valves work, it’s easy to select, troubleshoot, and install the right one for your application. OEM Nikki Carb Repair. Covers Quadrajet, Two-barrels, Monojet, 4GC and computer controlled carbs with complete rebuild instructions, mixture settings, basic adjustments, tuning for street or strip and tips on manifolds and fuel systems. To tune one right you don't just stick it on and adjust the mixture or idle screws. Anytime you rejet or change exhaust or air cleaner intake it is suggested to adjust the mixture. This is a home brewed tune-up procedure written in layman's terms for the do-it-yourself mechanic with a limited tool inventory. Poor milege at these speeds can be corrected by fitting a leaner jet needle. TBI fuel injection is a type of fuel injection system where the fuel is injected into the throttle body. As with any carb swap, expect to do some tuning to match these carbs to your engine and get maximum performance and fuel economy. But I don't think they are fuel input pressure related. Properly adjusting a Holley carburetor's air/fuel mixture is one of the most commonly overlooked and important considerations. 5km/L and 17km/L fuel economy, depending on if I thrash it or not. Asked in Carburetors, Fuel Economy and Mileage, Personal then back then out 2 1/2 turns,Fine tune from there,For best idle. Because there are so many manufacturers, there is no one way to tune the carburetor. Holley Truck Avenger Carburetor yes/no ? Last week I had a friend in my workshop. Secondly, the carburetor has the unique ability to hold a tune, so once it is tuned, the carburetor stay's tuned. After driving for a bit the secondaries will start to drip fuel into the carb at idle. Re: 4bl carb vs fuel injection I'd go for a carb for the same reasons you mentioned. Chevy High Performance tech article on how to get more mileage from your carburetor by using efi tuning techniques. The fuel inlet to a carburetor is slightly more complex than we've described it so far. Some of these carburetors advantages are they do not have throttles plates, slow speed venturies, or depression steps to obstruct their flow path. Being able to precisely control the air/fuel mixture, they allowed engineers to fine tune the engine to both meet tough emissions standards and offer increased power output. Harley CV Carburetor Mixture Tuning Notice: All instructions and the EZ-Just are intended for a Harley CV carburetor only. Once you've achieved the right air-fuel ratio, reinstall the air filter you've removed in the first step. NOTE - I've found the following EFI tables to be the most significant areas for improving fuel economy: Target Air/Fuel Ratio Table (too rich in cruising area). In the USA, the fuel flow for BSFC calculations is normally expressed in pounds per hour (lb/hr) while the output units, of course, are in horsepower (Hp). carb, a standard transmission can use a Double Pumper carb. Carburetor or fuel injection?. The AVS2, on the other hand, features annular boosters in the form of eight equally spaced holes in the booster rings. This makes it both a valuable fuel efficiency indicator and one more useful tool in gauging an engine's state-of-tune. 0:1 as you approach your peak boost level. A carburetor will have an air screw or a fuel screw, one or the other but never both. The backfire comes back through the carbs and through the exhaust on all cylinders. My guess would be the 351 would win the drag race, the 302 would be more fuel efficient and smoother in normal driving, the 351 will sound better on full throttle. Make small and careful adjustments and remeasure. What more could you ask for? The carb was a Frankenstein in that the power valve on our rebuilt 170 1100 died within a year of our purchasing it, so I swapped the carb top from a 144 carburetor we had laying around, just to get a good power valve. · What is the stock carb? · What are the stock tires and sizes? · Are the Road Stars tires ?tubeless?? · What is the wet and dry weight of the stock Road Star? · How much will the fuel tank hold? · How much oil do I need for a normal oil change? · What mileage can I expect? · What is the AIS?. Carburetor tuning tips: Another way of figuring out your car engine's air-fuel ratio is by using a digital meter. ENGINE TUNE-UP The Casual Way - CF-120. Does anybody have experience tuning these things. Now, I have a different technique in tuning my carb, after I take my scooter for a ride, I will then park it and put the center stand on, turn the engine on. Electronic fuel injection uses signals from several sensors located on the engine. or your bike has been. In the USA, the fuel flow for BSFC calculations is normally expressed in pounds per hour (lb/hr) while the output units, of course, are in horsepower (Hp). The carb calibration is obviously very important and the QJet is by far the best for mileage, but mileage depends more on the driver than anything. or your bike has been. previous page: Anti-Percolation DUAL CARBURETORS. This guide aims at tuning the fuel/air screw to give you an optimal air-fuel mixture. An eccentric bolted to the front of the camshaft actuates a mechanical fuel pump, which is mounted to the driver side of the timing cover, and this supplies fuel to the carb. Carburetor and Fuel System Troubleshooting Guide. Tuning your Carburetors: How to do a Plug Chop. The fuel reaches the carburetor OK, and I even recall checking out my fuel pump output pressure, which also seemed OK. This is a street car that will be driven alot, so I would like to get good fuel economy. The EFI system produces better fuel economy despite generating slightly more power. 95/ANY SIZE ORDER*** (excludes tires, exhausts, bulky items, chemicals, does not apply to. If the carburetor is not cleaned and tweaked regularly, then its ability to govern combustion process could be hampered, which results poor run and also poor mileage. These induction systems from Japan will out perform any other carburetor package out there, in both power and fuel economy. A carburetor that is tuned correctly will both protect your engine and induce optimal performance. Simple carburetor is more suitable for engine running at constant speed. How Fuel Injection Works. Good fuel economy and good performance can coexist with carburetor (to some. A choice needs to be made, tune it for all out street or all out performance there is very little in between. Refer to supplied owners manual (download here). Carburetor and Choke Cleaner helps dissolve gum, varnish, dirt and carbon deposits. The kit offers a wide range of tuning options for the CV carb. "Single stage" power valves are available in 1" increment sizes from 2. Jets; Carburetor Clamps/Boots; Carburetor Floats; Float Valve Assembies; Gaskets – Float Bowl / Other; Misc Carb Parts; Close; Carburetor Rebuild Kits; Carburetor Tools; Carburetor Tuning; Carburetors; Ultrasonic Cleaning; Close; Fuel / Gas Tank Sealers; Fuel / Oil / Vent Line. Of course if the Air/Fuel meter reads 10:1, then you are much too rich. Fuel mileage is usually measured at cruising speeds (65 mph on a flat, windless road) where the jet needle is the main mixture control. Doing so is proof that you are not using the other circuits correctly. Crank over engine – if there is no fuel discharge from the fuel line, check for kinked or bent lines. Carb Tuning Tips: Improving Mileage, Performance, And Drivability By Mark Gearhart August 31, 2010 When it comes to carbureted hot rods, it’s often assumed that poor fuel economy, emissions and drivability are compromises we must make in order to gain performance. When it comes to tuning a Holley carburetor the power valve has always seemed a mystery to many. The rate at which it injects fuel can also. Extension spray tube is included for those hard to reach areas. 2L Jeep inline six engine from 1981-90 is an emissions maze. This de-tuning has caused diesels to loose several mileage per gallon over the years. Stepped cam which holds a fast idle when the choke is operating. Contents[show] Terminology Lean: referring to the tuning of a carburetor in which the fuel/air mixture contains too little fuel and too much air Rich: referring to the tuning of a carburetor in which the. The damper slows and smoothes the movement of the piston. I have seen a 3310 give 18 MPG on a 454 in a ½ ton PU.