budget 273 build
How did you guys calculate the compression on your engines?
Here is a thread to explain how to do it accurately with reasonably priced readily available equipment.
http://www.forabodiesonly.com/mopar/showthread.php?t=278215
There are more than one method for taking the measurements. If the pistons are out of the engine for example, you can use liquid displacement, and measure how much volume is displaced... anyways
I did it by simply adding ot subtracting the volumes of all spaces in the combustion chamber.
A. Bore x stroke cylindrical volume
B. Piston side clearance tube top groove volume to low spot on valve releaf side of piston.
C. Dome volume (measured liquid rise mehod)
D. In the hole volume, Cylindrical from deck to low side of piston.
E. Gasket cylindrical volume
F. Head combustion chamber volume
Compressed volume after unit conversion.
Cv = B - C + D + E + F
Full volume
Fv = A + Cv
Then take the ratio between the two Fv and Cv solving for x; x/Cv=1/Fv
Kinda makes me wonder if the 9.0 reported above they forgot to subtract dome volume...