Thread: CR vs weight

Tweet

Interesting. The 408 stroker kits do use a longer than stock rod. Looks like if I get really fussy on the cam opening rates and run the aluminum heads I should be able to get away with a little higher CR. I would imagine squish is also critical on controlling the detonation???

Dave, check out what they are doing in the engine masters series in popular hotrodding. Now there's some real food for thought. they don't hide much either. Hank

I've been watching that with some interest, neat stuff.

Dave, I'm running 11:1 CR with 215 pounds of cranking pressure with flattops and 37 degrees timing on 91 octane. The most important part of the high CR is to get the squish right. I'm running zero deck and .038" head gasket. My heads are iron, and while smoothing the corners is good, polishing the chambers is not. When you first start your engine, within the first ten minutes of running, a carbon buildup develops in the chamber and this is your best protection against detonation. Even better than some high dollar coatings.(Courtesy of Curtis Boggs of Race Flow Technologies) It works. If you polish the chambers, the carbon flakes off.

Originally posted by camaro_fever68
When you first start your engine, within the first ten minutes of running, a carbon buildup develops in the chamber and this is your best protection against detonation. Even better than some high dollar coatings.(Courtesy of Curtis Boggs of Race Flow Technologies) It works. If you polish the chambers, the carbon flakes off.

Hmm that's interesting, I always thought that carbon build up was bad because it would shrink the combustion chamber that much more and only aggrivate the problem.....learn sumthin' new everyday I guess

Thanks,
Dutch

like them at o deck and make sure the head gaskets are right for the bore size i see this alot having the fire ring hanging in. and had a big block with 285 cranking psi thought the glass was going to brake on the gauge .the comp gauge standed up like a snake . i allway polished my head it a bit of work but i have never try any coating like to get some pistons tops done .

I've tried a couple sets of pistons with coated tops on drag cars. Interesting thought on the carbon buildup Fever, sure does make sense!!! I take it you're referring to the light black film in the combustion chamber, right????

Originally posted by Dave Severson
I've tried a couple sets of pistons with coated tops on drag cars. Interesting thought on the carbon buildup Fever, sure does make sense!!! I take it you're referring to the light black film in the combustion chamber, right????

Yep. Serves as a pretty good shield against hot spots.