Mr Maine

I measured a piston today and it is .025 in the hole. The gasket was .039 for a total quench of .064.

The short block is good so I'm not going to be decking it. There was no sign of spark knock/detonation before.

Its a .040 over 454 that I plan on running 308 dart irons in the 5600 range.

Is this too much quench? I always heard in the .040s to .050. I can run a thinner MLS gasket to get it to .050ish but they are of course twice the price.

Thoughts?
Thanks

SB

iTrader: (1)

NA that's too much and there will be no battle over that. Anything over .050 not ideal. ,060" and over, there really isn't any effective quench.

Black Baja

iTrader: (2)

I'm sure if you measure the rest correctly that measurement is going to be all over the place. If this is the case I would get it square decked by someone that's has a jig or cnc...

Mr Maine

Well, nice to see a thread without a battle, haha. It's amazing the piston looks almost zero decked until you measure it.
I'm sure there are plenty of engines out there running .060 plus with no issues, as I was, but looks like I will tighten it up to what I can.

Mr Maine

I will measure all of them and go from there.
Thanks

phragle

iTrader: (3)

Quenched is what my thirst feels after rapidly consuming a 32 ounce captain and coke.... Just thought I would throw that out there....

SB

iTrader: (1)

If it's low on VE (volumetric effeciency - ie: not filling the cylinders well with air) it's like running at partial throttle (if you will) which we all know will take more timing and less sensitive to knock. Now, fill those cylinders with more air (more VE) and then you run risk of load knock. IE: det under load.

That's my experience and opinion.

Mr Maine

Ok, I'll be running this pretty hard as I'm shooting for 550 horse out of a 462ci 454. I'll get the quench down.
How about compression? I plan to set it after everything is decided by deck the head. I know it depends on the cam for dynamic ratio, but can I go to say 9.2:1 and run regular? With a cam close to a 741 (but maybe less)

SB

iTrader: (1)

You could kill two birds with one stone and make your piston height higher with a bunch of jb weld. I'll pm you with shapes and process you'll want to use.

SB

iTrader: (1)

Are you going to be supercharging.....I'm guessing by the compression, cam, heads, and hp goal. Please say yes, LOL.