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

vladimir240 · 01-08-2009, 11:17 AM

hey guys. im currently blowing a crap ton of white/blue smoke on deccel. i had th turbo off the other day and there was some shaft play in and out, but not up and down. did the compression test last night(and wow starter is about to go out) and here are the results.
1 cyl- 145 psi
2 cyl- 140 psi
3 cyl- 140 psi
4 cyl- 145 psi

i tried reading googling around and got that numbers are supposed to be around 160?? so if you'all could tell me weather my numbers up there mean that i have bad rings?? or just a bad test?

any help will be appreciated. thanks

Sileighty_85 · 01-08-2009, 11:23 AM

Thats not too bad

A brand new SR according to the FSM is 157psi
Adverage is about 150

I got a friend whos is around 130-135 still runs and pulls hard

More than likely is the turbos oil seals are shot

Im sure if you pull the turbo off and check the exhaust side it would be oily.

How does the Compressor side look? Clean or oily?

vladimir240 · 01-08-2009, 10:58 PM

thanks man, oil is all in the piping, even some that just barely come out by the blow off valve. how about shaft play with it going in and out considerbly more, alot, way more, then up and down

Sileighty_85 · 01-09-2009, 01:45 AM

that turbo's toast, time for a rebuild or perhaps an upgrade?

Be sure to clean all that oil out of th IC system too

*GSXRJJordan* · 01-09-2009, 05:06 AM

Yup, /thread, it's your turbo. Your motor's not too happy either, but it's aiight. It's not so much the number, as the variance between the cylinders, that'll kill ya - you want <10% variance (you've got much more than that, but that could just be how you measured).

*fliprayzin240sx* · 01-09-2009, 08:16 AM

Some up and down is acceptable, lots of in and out is bad. Thats how you know the bearings are done and with the oil in your compressor side, seals are done too.

vladimir240 · 01-09-2009, 12:41 PM

yea Sileighty a upgrade would be nice, but not in the budged right now...

thanks for all the replys guys

handinpants · 01-10-2009, 09:03 PM

"My Penis is so big that if I laid it out on a keyboard, it would go from A to Z!!"
Hah! A and z are really close to eachother

handinpants · 01-10-2009, 09:23 PM

"My Penis is so big that if I laid it out on a keyboard, it would go from A to Z!!"
Hah! A and z are really close to eachother

vladimir240 · 01-11-2009, 01:18 PM

..........wtf?

Sileighty_85 · 01-11-2009, 01:39 PM

Quote:

Originally Posted by vladimir240

..........wtf?

hes talking about fliprayzin's Sig

01-08-2009, 11:17 AM	#1
vladimir240 Join Date: Jan 2008 Location: Oxnard Age: 21 Posts: 44 Trader Rating: (0)	compression test... hey guys. im currently blowing a crap ton of white/blue smoke on deccel. i had th turbo off the other day and there was some shaft play in and out, but not up and down. did the compression test last night(and wow starter is about to go out) and here are the results. 1 cyl- 145 psi 2 cyl- 140 psi 3 cyl- 140 psi 4 cyl- 145 psi i tried reading googling around and got that numbers are supposed to be around 160?? so if you'all could tell me weather my numbers up there mean that i have bad rings?? or just a bad test? any help will be appreciated. thanks

01-08-2009, 11:23 AM	#2
Sileighty_85 Nissanaholic! Join Date: Dec 2006 Location: Wishing Back in Okinawa -_- Posts: 2,321 Trader Rating: (0)	Thats not too bad A brand new SR according to the FSM is 157psi Adverage is about 150 I got a friend whos is around 130-135 still runs and pulls hard More than likely is the turbos oil seals are shot Im sure if you pull the turbo off and check the exhaust side it would be oily. How does the Compressor side look? Clean or oily? __________________ 後輪駆動車１番 1991 Built SR GT2871R -363whp 1998 S14 W/RB25- Rebuild in Progress

01-09-2009, 01:45 AM	#4
Sileighty_85 Nissanaholic! Join Date: Dec 2006 Location: Wishing Back in Okinawa -_- Posts: 2,321 Trader Rating: (0)	that turbo's toast, time for a rebuild or perhaps an upgrade? Be sure to clean all that oil out of th IC system too __________________ 後輪駆動車１番 1991 Built SR GT2871R -363whp 1998 S14 W/RB25- Rebuild in Progress

01-09-2009, 05:06 AM	#5
GSXRJJordan [JEFE S14] Join Date: May 2006 Location: << 626 >> Posts: 7,168 Trader Rating: (14) Rides Gallery: GSXRJJordan	Yup, /thread, it's your turbo. Your motor's not too happy either, but it's aiight. It's not so much the number, as the variance between the cylinders, that'll kill ya - you want <10% variance (you've got much more than that, but that could just be how you measured). __________________ TEAM SUSPECT is alive. www.JordanInnovations.com*

01-09-2009, 08:16 AM	#6
fliprayzin240sx SLINKY + ESCULATOR = Fun Times Join Date: Aug 2002 Location: Ass Crack of Japan Posts: 8,412 Trader Rating: (5) Rides Gallery: fliprayzin240sx	Some up and down is acceptable, lots of in and out is bad. Thats how you know the bearings are done and with the oil in your compressor side, seals are done too. __________________

01-08-2009, 10:58 PM	#3
vladimir240 Join Date: Jan 2008 Location: Oxnard Age: 21 Posts: 44 Trader Rating: (0)	thanks man, oil is all in the piping, even some that just barely come out by the blow off valve. how about shaft play with it going in and out considerbly more, alot, way more, then up and down

01-09-2009, 12:41 PM	#7
vladimir240 Join Date: Jan 2008 Location: Oxnard Age: 21 Posts: 44 Trader Rating: (0)	yea Sileighty a upgrade would be nice, but not in the budged right now... thanks for all the replys guys

01-10-2009, 09:03 PM	#8
handinpants BANNED Join Date: Feb 2008 Location: los Angeles Age: 27 Posts: 1,563 Trader Rating: (26) Rides Gallery: handinpants	"My Penis is so big that if I laid it out on a keyboard, it would go from A to Z!!" Hah! A and z are really close to eachother

01-10-2009, 09:23 PM	#9
handinpants BANNED Join Date: Feb 2008 Location: los Angeles Age: 27 Posts: 1,563 Trader Rating: (26) Rides Gallery: handinpants	"My Penis is so big that if I laid it out on a keyboard, it would go from A to Z!!" Hah! A and z are really close to eachother

01-11-2009, 01:18 PM	#10
vladimir240 Join Date: Jan 2008 Location: Oxnard Age: 21 Posts: 44 Trader Rating: (0)	..........wtf?

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