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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,022
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I used to build Holley race carbs for a bunch of people. Pretty good results. Had a daily driven street Vega that was in the low 12s. Cold weather starting wasn't an issue. (manual choke and used the "below 0° give it a pump of gas and count to 10 before cranking to let the gas atomize" method) Obviously it worked really good to do 12s thru the mufflers. (even delivered pizzas for a while in that monster) ...
... That is, it worked good until I added real road racing springs, sway bars, brakes, and rubber. The Holley fuel bowls can't control the fuel under very high G cornering and braking forces. You can add plastic vent baffles which help a little. You can run a hose from one float vent to the other (slit in the middle to provide venting) to keep from sloshing directly into the venturies. You can solder extension tubes to the jets so they pick up in the middle of the float bowl and that will help a little. And they sell foam floats that are trimmed to help control fuel level during cornering. Quite a stack of bandaids but in the end nothing will totally solve the issues of truly high G forces.
If you look at any traditional "performance" intake manifold you will see they mount the carb tilted forward to help counteract acceleration Gs (which are the lowest ultimate G forces on a car). Under truly hard braking the front float bowl will tend to over fill and you will see slosh either into the venturies or from the rear bowl to the front bowl.
When real cornering is added the problems get worse. The car would stumble for a couple hundred yards coming out of a corner until it cleared the flooded cylinders. If you look at applications where Holleys are successfully used you'll see it is drag racing, muscle cars (that don't come near Porsche levels of lateral Gs), and circle track racing where you can compensate for lateral Gs that are only in left hand turns.
Feel free to try it instead of any number of much more successful solutions. (Even Holley figured out that a generic EFI solution works much better and when you add in the costs of "screwing with it to try and get it to work" the EFI is much cheaper.)
__________________
- "Speed kills! How fast do you want to go?" - anon.
- "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh
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Wayne - 87 Carrera coupe -> The pooch.
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