Effective Done piston volume

Reply Subscribe

Thread Tools

Search this Thread

Feb 21, 2017 | 09:59 PM

mlm0

Thread Starter

Drifting

Joined: Dec 2012

Posts: 1,504

Likes: 73

From: Georgetown TX

Effective Done piston volume

I'm trying to do some compression calculations, But so can't really come up with a good number for effective dome piston volume for stock 89

anyonr know?

Feb 22, 2017 | 02:15 PM

mlm0

Thread Starter

Drifting

Joined: Dec 2012

Posts: 1,504

Likes: 73

From: Georgetown TX

One more try. Anything?😩

Feb 22, 2017 | 04:34 PM

mlm0

Thread Starter

Drifting

Joined: Dec 2012

Posts: 1,504

Likes: 73

From: Georgetown TX

Don't make me get mean😢

Feb 22, 2017 | 04:57 PM

Klondike

Team Owner

Joined: Feb 2006

Posts: 23,165

Likes: 117

From: San Antonio Texas

We really need to know what you are shooting for with what info you have on hand. Need to know your cylinder head chamber volume, Cylinder bore size (stock or bored out) Stroke ( again stock or not) head gasket thickness, and Piston height from the deck height at TDC and how much dome displacement on them if they're not flat top.
Lots of measurements to deal with before you can figure compression ratio.
Basically it is (1 cylinder) cylinder volume in cc. divided by: the head chamber volume + gasket volume + deck height volume in cc.

Feb 22, 2017 | 06:47 PM

mlm0

Thread Starter

Drifting

Joined: Dec 2012

Posts: 1,504

Likes: 73

From: Georgetown TX

I have all the info needed except piston volume. Can't figure out compression ratio without it. Someone surely knows what the stock piston volume in cc's is for a 1989 l98 with aluminum heads It has to be plugged into calculator to get compression ratio