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ChadS
09-17-2007 07:10:21
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Re: stupid motor in reply to smdv806, 09-16-2007 19:03:21
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Its not breathing. If your going from idle to full throttle, "cracking the throttle" It stumbles, hesitates, pops thru the carb. To help aid the stumble, you can go smaller on the venturi size, a 33 or a 29. Next, timing is off,,, they like their timing,,, and make em run a little labored at idle,,, (by ear) then dial the carb in to help smooth it out. Could have an intake valve too tight,,, double check em,,, Make sure the coil isnt getting hot,,, if it has a resistor, you should be ok. I ran points, with a spring set for the advance from a HEI chevy distributor, that speeds up the distributors reaction time,,, you want the distributor giving you full advance right at 1500, but, Id say it was all in on mine at 1300,,, helped crispen the throttle responce,,,,, When you do all the adjustments,,, get it warmed up to the weather conditions, Lately, its been a fly by night, up and down temps. So if its all warmed up to operating temp, weather may not affect the carb settings as much. A real good solution is the port the exhaust and manifold. That will uncork the severly backpressured cyl head on the exhaust side. At higher rpms, the air flow is fast enough,, things are moving,,, when your going from idle to full throttle, it backbuilds in the exhaust ports, and the engine can hesitate, be kinda sluggish on accleration and be tempermental. Shoot me an email sometime at [email protected],,, I have a 806 head with no valves and another head that has been ported,,, that I can send some pictures of. Just a simple gasket match port,,, but when you see the gasket, and the actual port in the head,,, big difference. JMHO, it needs it, but the venturis and the timing and the weight springs will help it out. Autolite plugs,,,,, 3116 or 386's . gap em at .032-.035 for starters,,, and work your way up,,, plug gap can affect acceleration too,,, especially if the timing is too far advanced. Hope this helps! Chad
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