platinum00

je, 8.5.1 pistons

1: 205
2: 210
3: 205
4: 205

seems high to me, but hey at least there solid numbers.

platinum.

turbo Si

DAMN.....I have 8.8:1 and mine is at 130 across the board!

arsenaldragster

pretty high for low compression pistons.. have you milled the head??

platinum00

so is there a problem. should i be woried.

i belive the head was milled when i had it built. no sure how much.

i could check my notes.

i just took it out for the 1st time and really got on it. car only has 500 miles on it. and 6psi. WOW. really fun. 1st gear is usless. . i need my fuel pump and my new injectors so i can bump this up bit. .

so anyway let me know about this compression. is it a issue.

thanks everyone.

platinum.

eg6turbo

damn those are pretty high...my friends jdm h22a with 10.6:1 was tested 210 across...milled would acount for a little of that...try a leak down and see whats the deal

platinum00

is there a way to do a leakdown test myself. or do i need a air compressor..


thanks

platinum.

eg6turbo

yes u do...do a search there is a topic descibing how to do it..

Quiklude

well on my h23 when it blew , i ran a compression test and got 195 195 0 195, minus the zero they were pretty high and im running arias 8.5:1's, now remember that the #'s you get from a compression tester shows you how well the cylinder is "sealing" not what compression ratio you, but with a lower comp ratio you can expect to see slighty lower #'s and vice versa with a higher comp. ratio.

platinum00

so why did you engine blow. did you have any fuel ...

great. so now im affraid im going to blow my motor.

platinum

eg6turbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quiklude &raquo;</TD></TR><TR><TD CLASS="quote">well on my h23 when it blew , i ran a compression test and got 195 195 0 195, minus the zero they were pretty high and im running arias 8.5:1's, now remember that the #'s you get from a compression tester shows you how well the cylinder is "sealing" not what compression ratio you, but with a lower comp ratio you can expect to see slighty lower #'s and vice versa with a higher comp. ratio.</TD></TR></TABLE>
well the difference from 8.5 and 10.6 is pretty damn big and having a difference of say 30psi could be the difference in CR but like imentions above do a leak down and see the differnce

platinum00

if the leakdown comes back good.

does that mean i just have a killer engine.

platinum.

racinskittle

If you got the head milled, that would have caused it. Sometimes they put a shim in there to prevent the increased compression. (not sure if they do that for all cars)