08-10-2015, 06:37 AM
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CC Member
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Join Date: May 2009
Location: American Fork,
Ut
Cobra Make, Engine: 66 Cobra
Posts: 930
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Not Ranked
X2 with blykins. Too high compression ratio for gas used. Advance to high for compression. It does not take high rpms to damage the engine under these conditions. With loud exhaust it makes it hard to hear it knocking. Since you have some pistons out measure or find the CCs of the heads and find or calculate piston valve relief CCs and piston height. Do some reading on Dynamic Compression ratio. If you have the cams specs you can calculate it here.
https://www.uempistons.com/index.php...bc6726aec853da
Generally, you want dynamic compression between 8 to 8.5.
Static compression does not take into consideration your cam, which is critical.
I have a friend that can't drive his Cobra on the street without race gas. Big mistake on the engine design. Good luck.
__________________
Wayne
"Everything is alive. If you get angry at a vehicle or the trans, it won't fix until you apologize and say you are sorry." "The vehicle always knows what it is doing and what the cause of it's bad feeling is. If you ask it humbly what the problem is, it will tell you. Then you and it will both be happy."
Gil Younger
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