Compression Question

[K_Hill]

Ok I just rebuilt me motor and put a new port and polished head with crower cam gears, manly valves and springs, and COMP ZEDEX RACING CAMS GRIND NUMBER XE259HR-111 INTAKE LIFT 411. EXHAUST 395 LIFT.. I done a compression test and 1 and 2 have 140 - 160 psi and 3 and 4 only have 30 - 60 psi. What could be my problem here?? Could it be a timing issue?? I need help very badly!!! I can't figure it out.

 

[GILZTSIAWD]

Sounds like it is your timing. Those cams may need to be degreed in.

 

[vaboys2ndgen]

check and make sure all the plugs are plugged in. my power transistor plug wasn't in and that was the reason my compression was lookin like shit. easy miss. i know it was for me.

 

[K_Hill]

So how should i degree it by advancing it or retarding it?? I am pretty sure I have it timed right.

 

[playitlouddsm]

If you want some information on degreeing cams, look at this site http://www.stahlheaders.com/JpgFiles/issue1.pdf and go down to page 4. That might help a little bit.

 

[1fast97gsx]

check and make sure all the plugs are plugged in. my power transistor plug wasn't in and that was the reason my compression was lookin like shit. easy miss. i know it was for me.

What would a power transistor have to do with compression???? Compression is a measure of the air being compressed by the piston / rings against the head. This is totally mechanical...

 

[K_Hill]

http://www.stahlheaders.com/JpgFiles/issue1.pdf doesn't work for me.

 

[vaboys2ndgen]

What would a power transistor have to do with compression???? Compression is a measure of the air being compressed by the piston / rings against the head. This is totally mechanical...

i was just stating what happen to mine. my compression went from 115-50-125-120 to 177-180-180-182 just plugging that plug in. and that was 3 days in between each other. just stated what happen to mine. thats all.


jeremy

 

[K_Hill]

I got it running good now.. All I had to do was get the cams degreed in. Thanks for all the help guys.

 

[1fast97gsx]

i was just stating what happen to mine. my compression went from 115-50-125-120 to 177-180-180-182 just plugging that plug in. and that was 3 days in between each other. just stated what happen to mine. thats all.


jeremy

Maybe your battery was low on your first test or you did it on a cold engine? Then the second time you had more of a charge or the engine temps were up to where they should be? Either way unplugging that transistor won't change compression number ... it's physically impossible.