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Original Message
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| RE: Whenever I read about someone... |
| By Gerry Proctor - 01/28/2003 10:10:44 AM; IP 207.133.188.254 |
The area where you find the main difference is in the air and fuel metering in the idle circuit. If you look at the specs for a single four barrel Ford Holley application vs a Ford Holley dual quad set up, the idle air bleeds are a different size and the metering blocks are different. I'm working from a foggy memory on this but the single four application uses a .0019 air bleed orifice while the dual quad uses a .0041 air bleed. I don't recall what the main air bleed sizes are. The idle fuel circuit is also slightly different. That is why the metering blocks and throttle bodies have different part numbers. This is also why putting a brace of 1850 or 3310 Holleys on a dual quad intake doesn't work very well at idle and light cruise. They tend to run rich when not on the enrichment and main metering circuits. You can only partially address this through the idle air bleed. This is a great reason to get a brace of Webers since the emulsion tubes for both the air and fuel circuits are fully tuneable. Of course, by then the $900 for the correct dual quads will seem cheap by comparison.
If you want proof you can see for yourself, go to Edelbrock's web site and notice that they offer two 500 cfm performer carbs. One is for the single quad apps, the other for the dual quad apps. The only difference is in the air and fuel metering circuits.
The bottom line is still as Royce wrote. A properly set up multi-carb system is astounding both in performance and aesthetics. |
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