clearance volume
Thread Starter
Racer
Joined: Sep 2010
Posts: 327
Likes: 2
From: se iowa
clearance volume
Hi all I would like to try and calculate the approximate CR that my motor will have with various thickness head gaskets before I buy one. I'm using stock pistons with the 4 eyebrow looking reliefs. However I'm changing the cam to have a lift of .512/.519. I haven't received the cam yet to have it installed and just measured but was wondering how to estimate this portion of the formula.
Also with the stock piston would I be far off assuming a 4.5cc for +.275 volume in the cylinder? Thanks to anyone willing to set me on the right path.
Also with the stock piston would I be far off assuming a 4.5cc for +.275 volume in the cylinder? Thanks to anyone willing to set me on the right path.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Allows you to calc CR ( and change inputs to see affect on CR ) and if you have cam specs available can calc DCR
http://members.uia.net/pkelley2/DynamicCR.html
Also good explanation of how cam specs can change engine performance
