Whats my compression?

S

steveep82

Member +
Ive taken 3 thousands of an inch off my head and block faces and i have 74.5mm weisco pistons with a 10cc dish installed and run a 1.2mm headgasket, can someone work out what compression im running please, and also the new capacity of the engine? Thanks!
 
G

gorganl2000

Lifer
your new engine capacity appears to be 1350cc
here's the formula [22/7*(3.725^2)*7.74*4] OR (22/7*3.725*3.725*7.74*4)

i'm getting out your compression to be approximately 7.5 with estimated cylinder pressures of between 130-145 psi per cylinder

PS---this is based on my own calculations....and may be not be 100% accurate---as u have to estimate somethings/rounding

maybe some1 with a program can do it for u........but my calculations are usually pretty close based on what i've seen before
 
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HYBRID

HYBRID

Super Moderator <a href="http://www.toyotagtturbo.
GP82 said:
Haha. If there was a program it would be very useful. Is there one?
Click to expand...


speak to slostar on austarletclub hes got the program ;)

ps, @ gorganl.. see all those hours in the office do pay off man lol :D awesome calculation dude!! :rockon:

kon
 
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gorganl2000

Lifer
yeah.....just got to love the office work.....lol

i created something of an excel spread sheet that calculates compression for 4e/5e based on the user's specs......i must say.....it does tend to be VERY close if not 100% accurate.....this calculator took me less than and hour to get all the formulas in.......BUT it was finding certain information on the 4e/5e that took a long time

so if any of u guys doing a build and want to find out your CR....u can drop me a line....and i'll see what i can do--that's if u cant find slostar, as pointed out by hybrid
 
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