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Original Message
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| Idle Circuits |
| By John - 01/29/2003 9:11:51 PM; IP 142.177.79.184 |
| The problem with 2X4 Holleys is, as noted earlier in this thread, the idle circuits. Although the engine may draw the right mixture at speed, as the air fuel ratio is governed by the main venturis, the idle circuits are set with the assumption that only one carb is on the engine. Two carbs...twice the needed fuel at idle. The mixture screws are only a "fine" adjustment, so you can turn them in all the way and it's still too rich. The idle jets must be reduced in size until they are close enough to allow the mixture screws to lean out the engine to a stall. They can be replaced, or a small wire bent into a "V" with little feet bent on the ends, can be inserted in the jets. The secondary idle circuit (used to bleed off fuel in a lightly used car so it doesn't get stale) don't really require the same attention. You can fiddle around with the wires till you get it right and probably spend $900 in float bowl gaskets, or you can get someone to give you out of the box units with the correct vacumm balance covers. Pony Carbs supplied me with two units that work perfectly with my Offy 360Deg manifold (which many hold in disdain). You guys with other FE's out there might be faster, but I havn't seen a Chevy yet that was. |
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