11-20-2006, 04:54 PM
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CC Member
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Join Date: Jun 2003
Location: Palma de Mallorca, Spain,
ESP
Cobra Make, Engine: Contemporary with 482 KC/SO, TKO600,IRS Jag/AMP, 3.54 Salisbury PL,
Posts: 582
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Not Ranked
The engine is a 427 FE with 427cid. The cam is a Comp 282S with gross lift of .571 and 236 duration at .50. Lobe separation is 110.
Yes, I got rid of the popping. The problem is that in order to get a good transition you usually fatten up your idle and you main jet. Anything runs on #70 idles I read somewhere and that is absolutely true.
If you follow the instructions in the weber manual as on how to find the correct idle you end up with a 70 idle jet. So you run pig rich and at medium throtle your engine hesitates and surges. That was happening to me. I also was using an enormous amount of gasoline and leaving black clowds all over the place when accellerating hard.
So I went with a 55 idle and noticed the engine going lean on transition. The #60 idle holder fattens the mixture up at the lower transition curve, and for some reason the F11 picks up from there much better than the F7 or F5 and takes you smoothly out where the main jets take over.
I also turn the idle screw out 1/2 turn more than what it should be and the popping goes AWAY.
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Nothing sounds better than a Cobra in a Tunnel !
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