09-08-2004, 10:09 AM
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CC Member
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Join Date: Jan 2004
Location: Sacramento, Calif.,
Ca
Cobra Make, Engine:
Posts: 15
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Not Ranked
Detonation
With Keith black Hyp pistons, you have to use much wider ring end gaps due to the heat transfer through the top of the piston. If these are Wiseco pistons, then detonation, and not ring butting is the culprit. With the MTBE in the gas, the cylinder temps are way up compared too what they used to be 5 or 6 years ago. This causes ring gaps to tighten and piston to wall clearance to tighten, along with a easier tendency to detonate. Distributor curves are important here too. If someone is running a vacuum advance distributor in a Cobra,(light car under no load) then when crusing at freeway speeds all of the centrifical and vacuum advance is in. This could mean as much as 55 degrees of total advance-OUCH!!
Hope this helps. Tom
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FE Specialties Your West coast FE source. We build FEs with todays technology, not circa 1970. We can supply you with any type of engine and drive train parts. From mild to wild. We engineer engines, not just throw parts at them. I currently am campaigning a 67 coupe that has C4AE-G iron heads, full interior, 3300 lbs. 10.51 @ 130.5mph. 665 HP(revised) with 11.6 to 1 comp. single 4 barrel.
Thanks Much. Tom
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