Low compression on #2 Cyl, valve or ring? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

COstyle · 08-31-2005, 03:14 PM

My S13 blacktop has a serious problem but Im not sure what exactly. Here are my symptoms:

#2 Cylinder shows 90psi, 1,3,4 show 145+

*Oil catch can fills up/overflows in a number of minutes of hard driving

*Found oil on all sparkpulgs (aka in combustion chamber)

*Exhaust stinks badly (much more than usual) but doesnt really smoke

Can you tell from that if its something in the head or a ring? Also I think my turbo is on its way out, that could be adding to it. Please help

statik · 08-31-2005, 04:54 PM

your rings are shot, pour a little oil into the cylinder and then try the compression test again it should go up a bit (mine went from 70->90). Right now your boost is blowing past the rings and taking all your oil with it...time to pull the motor apart =]

Pstl_pete · 08-31-2005, 09:21 PM

Get a leak down test done and that will tell you exactly where you are blowing by. Its cheap and accurate.

08-31-2005, 03:14 PM	#1
COstyle Leaky Injector Join Date: Jul 2003 Location: Southeast PA Age: 38 Posts: 140 Trader Rating: (1) Feedback Score: 1 reviews	Low compression on #2 Cyl, valve or ring? My S13 blacktop has a serious problem but Im not sure what exactly. Here are my symptoms: #2 Cylinder shows 90psi, 1,3,4 show 145+ Oil catch can fills up/overflows in a number of minutes of hard driving Found oil on all sparkpulgs (aka in combustion chamber) *Exhaust stinks badly (much more than usual) but doesnt really smoke Can you tell from that if its something in the head or a ring? Also I think my turbo is on its way out, that could be adding to it. Please help

08-31-2005, 09:21 PM	#3
Pstl_pete Zilvia Junkie Join Date: Nov 2004 Location: LA,CA & Windsor, ON Posts: 443 Trader Rating: (4) Feedback Score: 4 reviews	Get a leak down test done and that will tell you exactly where you are blowing by. Its cheap and accurate. __________________ S14 - New SR Project http://www.speed.academy

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08-31-2005, 04:54 PM	#2
statik Zilvia FREAK! Join Date: Oct 2003 Location: Long Island, NY Age: 37 Posts: 1,358 Trader Rating: (0) Rides Gallery: statik Feedback Score: 0 reviews	your rings are shot, pour a little oil into the cylinder and then try the compression test again it should go up a bit (mine went from 70->90). Right now your boost is blowing past the rings and taking all your oil with it...time to pull the motor apart =] __________________ 97 240sx esaarr \| Current Status: SOLD