General Category > Quadrajet Carb Talk and Tips

2x4 Oldsmobile 455

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Marx3:
I got ya! :-) it's time for some good old trial and error!

It makes sense why the idle systems will need to be dealt with as the draw of air will be lesser since the "bleed" surface (around each throttle plate ) will be twice that of a singe carb.
I guess this will mean the idle systems will have to be calibrated more like for a big cam...

I will most certainly post updates AND pictures once this gets on the road. The engine it is meant for, I haven't even begun rebuilding it yet, though. saving up some money to buy the 495 cui strokerkit.
Come spring I might be far enough in the whole engine build, that I can start looking into this part of the setup.

Cliff Ruggles:
Cool, sounds like a fun project, let us know how it turns out?.....Cliff

Marx3:
sure thing!

von:
I'm wondering if it would work to adjust the front carb idle so the primary blades are all the way closed and plug the idle air bypass to in effect take its idle circuit away until the throttle is opened. The primaries of the rear carb would be the only idle circuit. This would make it effectively like the Pontiac and BB Chevy 3x2 setups of the 60's where the end carbs had no idle circuits and blades were all the way closed until called upon.

Marx3:
I think that could work also, but I have an idea it would create a potentially stronger idle if the engine is supplied fuel from both carbs.

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