SR20de HI-port compression

StevenLK · Oct 5th, 2004, 11:00 AM

i have searched but found diffrent answers but awhile ago i did a comp.test and i had all four cyl. come up 181-183psi... i thought it was suppose to be like 161? but what is the correct psi. and is it too low or too high, and is high port and low port make a diff at all? i dint think so but anyway...
thanks !

SR20dee · Oct 5th, 2004, 11:45 AM

theres such thing as too high

i think that the Limits are supposed to be like 156 average or something around there. i lost my classic's manual or id verfify that info.

mine ran 187 accross 4 cylinders so it doesnt sound bad if thats what your worried about.

lshadoff · Oct 5th, 2004, 12:33 PM

According to the FSM:
Compression Pressure
Standard - 178psi
Minimum - 149psi
Difference between cylinders - 14psi

Lew

StevenLK · Oct 5th, 2004, 06:34 PM

Quote:

Originally Posted by SR20dee

theres such thing as too high

i think that the Limits are supposed to be like 156 average or something around there. i lost my classic's manual or id verfify that info.

mine ran 187 accross 4 cylinders so it doesnt sound bad if thats what your worried about.

in the haynes manual it said that there is something like too high of compression. that its bad because there is carbon build up and stuff but i dont know thats why i asked. thanks!

sr20steve · Oct 6th, 2004, 07:50 PM

I got 180 (+ or - 1 or 2 psi) all accross.

Radioaktiv · Oct 7th, 2004, 08:34 AM

did you swap in a JDM sr20 by chance?
iirc some of them come 10:1 from the factory

B14Boost · Oct 8th, 2004, 10:47 AM

I think for USDM SR20 its 9.5:1. At least for a motor from 91-93 N/A.

StevenLK · Oct 13th, 2004, 12:05 PM

when i bought it on the engine had marked "NX2000" and i know it is high port and but yeah.