Quench question

[phat46]

Another question for the engine building gurus here. What quench number do you like or recommend? I know the standard answer is .035-.045 for a mild SBC. I am looking at .037 with an .051 head gasket and was told that might cause pinging. I would like to be closer to .040 quench, but can't find a .054  gasket. Am I too worried?

[chimp koose]

too worried. When quench gets MORE than .060 then you can get a problem with detonation . The proper term is squish, it is used to generate turbulence in the chamber to promote even charge density. I looked into Singh grooves but it seems more of an observation evaluation more than empirical data to support it . If you want to do some research into deck heights I would suggest you go to a site called speed talk and search out the topics you are interested in .

[phat46]

too worried. When quench gets MORE than .060 then you can get a problem with detonation . The proper term is squish, it is used to generate turbulence in the chamber to promote even charge density. I looked into Singh grooves but it seems more of an observation evaluation more than empirical data to support it . If you want to do some research into deck heights I would suggest you go to a site called speed talk and search out the topics you are interested in .

Thanks, I understand the term and the reason for it, just worried that I might be too tight. You can read all kinds of things online, like Smokey Yunick saying absolutely never less than .038.and others saying .030 is fine. I see the terms quench and squish used interchangeably and also as two separate things....I should quit reading so much and just screw the motor together! 😄

[rumrumm]

You should be fine. It doesn't get iffy unless you are running on the edge of dynamic compression parameters.