Did a compression test
02-22-2005, 09:57 PM
#1
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Thread Starter
Join Date: Jan 2003
Location: Pembroke Pines, FL
Posts: 128
Car Info: 2004 WRX
Did a compression test
I was swapping out plugs so I figured I might as well check compression while everything was out. I did it just after driving, so the engine was pretty hot.
first try engine hot:
Cylinder 1: ~150-153
Cylinder 2: ~155-160
Cylinder 3: 155
Cylinder 4: ~155-160
second try engine hot:
Cylinder 1: 150
Cylinder 2: 155
Cylinder 3: 150
Cylinder 4: 155
third time about an hour or two later, engine was warm, not hot:
Cylinder 1: 155
Cylinder 2: ~160
Cylinder 3: 150
Cylinder 4: ~158
Last try, about 30 mins. after third, engine warm to touch:
Cylinder 1: 150
Cylinder 2: ~160
Cylinder 3: 150
Cylinder 4: ~160
How do these number look? I can see a general trend in that my passenger side bank of cylinders(1+3) seem to be slightly lower than my driver side bank. Should I be worried, or does this sound within normal spec?
first try engine hot:
Cylinder 1: ~150-153
Cylinder 2: ~155-160
Cylinder 3: 155
Cylinder 4: ~155-160
second try engine hot:
Cylinder 1: 150
Cylinder 2: 155
Cylinder 3: 150
Cylinder 4: 155
third time about an hour or two later, engine was warm, not hot:
Cylinder 1: 155
Cylinder 2: ~160
Cylinder 3: 150
Cylinder 4: ~158
Last try, about 30 mins. after third, engine warm to touch:
Cylinder 1: 150
Cylinder 2: ~160
Cylinder 3: 150
Cylinder 4: ~160
How do these number look? I can see a general trend in that my passenger side bank of cylinders(1+3) seem to be slightly lower than my driver side bank. Should I be worried, or does this sound within normal spec?
03-08-2005, 09:47 PM
#4
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iTrader: (7)
Join Date: Dec 2002
Location: Flying on the H1 w/ 75 psi of compression on all 4 cyl
Posts: 2,859
Car Info: PnP VF30 w/ STi injectors Perrin intake walbro fuel pump w/ a TXS TBE
I know this is going to sound funny but i did a compression test on my car and it read 70,75,75,65. Car won't hold boost past 11.9 PSI sucks really bad.
I guess what i'm trying to get at is one day i started the car and it was just idling real ruff, but before that when i drove it felt fine. What is the lowest it can read before your car is not drivable? I still drive the car now till i get pistons for my 2.2T but i'm just wondering if i'm going to boost driving up hill and its going to just die?
I guess what i'm trying to get at is one day i started the car and it was just idling real ruff, but before that when i drove it felt fine. What is the lowest it can read before your car is not drivable? I still drive the car now till i get pistons for my 2.2T but i'm just wondering if i'm going to boost driving up hill and its going to just die?
03-09-2005, 10:36 PM
#6
Registered User
iTrader: (7)
Join Date: Dec 2002
Location: Flying on the H1 w/ 75 psi of compression on all 4 cyl
Posts: 2,859
Car Info: PnP VF30 w/ STi injectors Perrin intake walbro fuel pump w/ a TXS TBE
Yes i still have the original block and heads in. I hope i did the compression test right even though i think its really hard to screw up. I let the engine turn over 8 times and checked the gauge i still pull away from stop lights and sometimes it stil feels strong except when i have the AC on then it really sucks. Car shakes alot too when just sitting there and idling w/ AC on.
i still pull away from stop lights and sometimes it stil feels strong except when i have the AC on then it really sucks. Car shakes alot too when just sitting there and idling w/ AC on.
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