Start out with your total timing the same as on gas then adjust for best mph. Now turn them out 1.5 to 2 turns. Most Datsuns with Weber's idle best with Air/Fuel ratios of 14.7 or lower. 14.7 would be the cleanest with minimal fumes but at a slight sacrifice of idle smoothness. See more answers. Set Idle Mixture This sounds too simple, but many enthusiasts tend to overlook how important it is to set idle mixture correctly. Keep in mind that almost any Holley-equipped V-8 with a good ignition system can run a 16:1 air/ fuel ratio at cruise. Set the idle mixture to the highest vacuum reading by using a vacuum gauge connected to the constant-vacuum port of the carburetor’s base plate. [5] Lastly, the exact amount of fuel needed changes between the overly-lean lower limit of 16:1 and the overly-rich upper limit of 9:1 as the engine operating condition changes. In practice, the ratio may be different. As mentioned above, the idle jet is first selected to obtain the optimal air/fuel ratio when cruising. Ignition timing is even more important with EFI due to the precision that EFI offers for fuel control. Re-set idle speed per instructions on decal in engine compartment. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. Holley's Street Avenger 4-barrel carbs offer trouble-free operation in an easy-to-install package. Find Holley 0-82751SA Holley 4150 Aluminum Street HP Carburetors and get Free Shipping on Orders Over $99 at Summit Racing! Yes No. Rod position, and hence mixture richness, is further controlled by engine vacuum, resulting in a fuel mixture that is always tailored to instantaneous engine load. When adjusting the idle speed be sure that the idle compensator is closed. Unanswered Questions. The carburetor is fully tunable. In fact, you will probably find that the combustion is much more accepting of the fuel/air mixture provided by the Sniper EFI than that of the carburetor. Sign 1 - Sluggish engine performance. The all new Aluminum Street HPs weigh up to 40% less and are even easier on your wallet. They're calibrated to deliver the performance that you need, without the tuning headaches involved with other carbs. Idle speed setting. Holley is proud to introduce the all new Aluminum Street HP™. Any change to engine performance may point to a failing carburetor. The Idle Enrichment Screw merely tweaks the air/fuel ratio at idle. Setting the idle mixture to the highest vacuum can be achieved using a vacuum gauge connected to the constant-vacuum port of the carburetor base plate to adjust each idle-mixture screw to its highest value. Check solenoid operation. Flow must be increased throughout the whole system and fuel curve. In summary, it can be said that the ideal carburetor provides the correct air-fuel mixture ratio, as required by the engine, under all of its operating conditions. External idle mixture screws enable precise adjustment of the idle mixture. A failing carburetor won’t offer the proper fuel-air mixture… Adjust each idle mixture screw (Figures 3 & 4) 1/8 turn at a time, alternating between each screw. 3. With EFI, you are able to use a more aggressive timing curve than you may be able to with a carburetor, because of the ability to control the air/fuel ratio at varying load and RPM. Not Helpful 0 Helpful 1. Your air/fuel mixture is set wrong on the carburetor. To do this, open up the Initial Startup gauge screen that was used in section 17.0. The atomization is generally just a little bit better and ratios more consistent, leading to less rich spots in the RPM range and puddling of fuel in the intake. Find Holley 0-80670 Holley Street Avenger Carburetors and get Free Shipping on Orders Over $99 at Summit Racing! Now, turn mixture screws in until idle speed drops 25 RPM on tachometer. They utilize the best features from Holley's Race Bred … Wheeler Dealers is a British television series produced by Attaboy TV for the Discovery Channel in the UK and Motor Trend Network in the U.S., fronted by Mike Brewer, with mechanic Edd China in Series 1-13 and Ant Anstead starting from Series 14. Keep moving around the carburetor, adjusting each screw an eighth to a quarter turn and waiting for the carburetor to respond. With a car engine, it's a bit more complex. Sign 2 - Difficulty starting. 4. The adjustment should be … Thanks! This is more than just increasing the main jets (in a carburetor) by 30%. Holley regulators are "OK" but don't go below 3psi, and stock carburetors (Solex, Bocar, Brosol, and Kadron) all run best with 1.5-2psi fuel pressure. Tire smoking performance has never been so affordable! Holley 750 Carb vs. HP EFI (Air/Fuel Ratio) Looking at the air/fuel ratio curves generated by the carburetor and fuel injection, we see that the … This problem is evident when acceleration falls off or fuel economy declines. Make one adjustment only to the first screw. Idle mixture adjustment: Adjust idle mixture screws to lean best idle. Generally speaking one jet size represents a 4.5% change in a Holley type main jet. Basic setting for idle mixture screws is 2 turns open from fully closed for 1966-68, 3 turns for 1969, 1 turn for Holley 2300, Air condition to be ON, except Mark IV and all 1972. 2. 2. Artwork: In theory, a car engine needs 14.7 times more air than fuel if the air-fuel mixture is to burn properly. mixture according to throttle position. Repeat the operation on 2 and 4V carburetors. Lightly seat the mixture screws by turning clockwise. Slowly adjust the first idle-mixture screw. Weber IDF, IDA, ICT, DFEV/DFAV, and DCNFs work best with 3-3.5psi, so this regulator works for all of them, … 3. If the mixture ratio changes from one cruise speed to a higher speed, you should consider changing the slope by changing air bleeds (see Chapter 2). This is called a stoichiometric mixture and it works out as 94 percent air and 6 percent fuel. This will give you a good starting point. You need to adjust the settings on the volume control screw, as well as the air bypass screw, to set the proper air fuel ratio. 6 percent fuel HPs weigh up to 40 % less and are even easier on your wallet be throughout! Avenger 4-barrel carbs offer trouble-free operation in an easy-to-install package adjustment of the carburetor’s base plate must... Enable precise adjustment of the carburetor’s base plate Summit Racing, turn mixture screws in until idle speed per on. Shipping on Orders Over $ 99 at Summit Racing headaches involved with other carbs Shipping! 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