how to calculate compression ratio?
Thread Starter
Supreme Member
iTrader: (9)
Joined: Sep 1999
Posts: 3,871
Likes: 24
From: Mass
Engine: 350 TPI
Transmission: A4
Axle/Gears: 3.23
how to calculate compression ratio?
I am looking for the formula to calculate CR. what will the ball park compression be with a pair of 58cc heads on a stock 350 block.
Supreme Member
Joined: Nov 2001
Posts: 1,886
Likes: 0
From: Jacksonville, NC
Car: Guess
Engine: Crazy 8
Transmission: So close to being a manual I can taste it
Here is a formula out of a book I have.
CR=C-(P) + G + V / C-(P) + G
C= combustion chamber volume
P= displaced dome volume
G= compressed head gasket volume
V= swept volume in the cylinder
I don't know if you will find this helpful, but there it is...
When I figured my compression ratio on my latest engine, it took me a while to figure it all out. I don't estimate, I measure the volumes and get an exact answer...
CR=C-(P) + G + V / C-(P) + G
C= combustion chamber volume
P= displaced dome volume
G= compressed head gasket volume
V= swept volume in the cylinder
I don't know if you will find this helpful, but there it is...
When I figured my compression ratio on my latest engine, it took me a while to figure it all out. I don't estimate, I measure the volumes and get an exact answer...
Supreme Member
Joined: Jul 2003
Posts: 1,096
Likes: 0
From: Lima, OH
Car: '89 Formula 350 & '86 Z28
Engine: L98 & 355ci
Transmission: 700r4 in both
do a google search, "compression calculator" and youll get a buch of sites where you can just punch in a bunch of your numbers and it will calculate it for you.....yeah im lazy....
Supreme Member
Joined: Aug 1999
Posts: 2,441
Likes: 1
From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
Thread
Thread Starter
Forum
Replies
Last Post
Damon
Tech / General Engine
8
Sep 26, 2015 04:29 PM
