Compression check - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Revolver Ocelot · 06-30-2005, 02:23 AM

Do these compression numbers sound good to you guys? 130,145,132,135,130,128. They are all pretty close except the 145 and 128. These numbers are all for an Rb25.

Father Time · 06-30-2005, 05:38 AM

dont know for sure what rb service limits are ( ~150's?) but those are low numbers.

prophet_19 · 06-30-2005, 09:59 PM

it says it in the FSM

sdtouge · 06-30-2005, 10:47 PM

doesnt sound too good. not terrible but unless your rebuilding it i would stay away from it.

check the skyline factory servie manual and see what the specs are for high/low and see what the max diff% between cylinders is.

nismo101 · 07-01-2005, 09:40 AM

Quote:

Originally Posted by TheONE

Do these compression numbers sound good to you guys? 130,145,132,135,130,128. They are all pretty close except the 145 and 128. These numbers are all for an Rb25.

did you do it with the engine warm? Compression numbers go up with warm parts.

I bought a FWD SR20DE for my old sentra SE-R, I did compression check right when I got the engine, it was pitiful. One cylinder was down 50 psi! the others were all low. This engine may had been sitting in a JDM wrecking yard for a few years, so there was probably some oxidation in the cylinder walls.

After getting the engine running and driving it for a month, I did another compression check, with the engine warm, they all came out to 210psi dead even in every cylinder, and it stayed that way until I sold the car.

ledzeppelin240 · 07-01-2005, 04:28 PM

There can be a 20% difference between cylinders generally speaking. Did you have the throttle plate blocked open, if not you will get lower numbers...

07-01-2005, 04:28 PM	#6
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	There can be a 20% difference between cylinders generally speaking. Did you have the throttle plate blocked open, if not you will get lower numbers... __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

06-30-2005, 05:38 AM	#2
Father Time Leaky Injector Join Date: Jun 2005 Location: AR Posts: 113 Trader Rating: (0) Feedback Score: 0 reviews	dont know for sure what rb service limits are ( ~150's?) but those are low numbers.

06-30-2005, 09:59 PM	#3
prophet_19 Zilvia Member Join Date: Sep 2004 Location: Banned Forever Posts: 285 Trader Rating: (0) Feedback Score: 0 reviews	it says it in the FSM

06-30-2005, 10:47 PM	#4
sdtouge BANNED Join Date: Dec 2004 Location: san diego Posts: 479 Trader Rating: (0) Feedback Score: 0 reviews	doesnt sound too good. not terrible but unless your rebuilding it i would stay away from it. check the skyline factory servie manual and see what the specs are for high/low and see what the max diff% between cylinders is.