Exactly what values are needed to compute CR?

scorp508 · 02-01-2003, 08:35 PM

I'm having my heads milled and pressure tested after having one of them welded to repair a bolt that got into the combustion chamber. Anyways I figured now would be a good time to hot tank them and also have them CC'd exactly.

So... what exactly needs to be known?

CC of combustion chamber?
CC of valve reliefs?
Piston to deck clearence?
Thickness of head gasket?

Thanks.

CFI-EFI · 02-01-2003, 09:48 PM

That's most of it. The bore of the gasket X the thickness will allow you to compute the volume of the gasket. Some gasket manufacturers list the CC's of their gaskets in the specs. Don't forget the bore and stroke of the engine. You're well on your way. I am in the process of doing the same thing. Good luck, and...

RACE ON!!!

QuickVet · 02-01-2003, 10:50 PM

That is it. What compression you shooting for?

How did a bold get in there :confused:

danno85 · 02-01-2003, 11:03 PM

This is from my engine. If you have Excel I can send you the spreadsheet
and you can plug in your numbers.

Dan

lspalding · 02-01-2003, 11:47 PM

Here's what you need.
http://www.kb-silvolite.com/calc.phtml

LD85 · 02-02-2003, 11:07 AM

http://www.kb-silvolite.com/page56.htm