Engine/Power - EJ20T (pre-2006 WRX and JDM) There is replacement for displacement, it is forced induction - OEM 2.0 liter turbo engines in the USDM WRX. 90-94 Legacy Turbo EJ22 turbo engines can also be discussed here.

Did a compression test

Old Feb 22, 2005 | 09:57 PM
  #1  
JDM SiR's Avatar
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From: Pembroke Pines, FL
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?
Old Feb 22, 2005 | 10:33 PM
  #2  
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Car Info: 1993/2000/2001 GF4 mostly red
Those are within the FSM specs I believe.
Old Mar 8, 2005 | 12:43 PM
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From: Bay Area, Calif.
Those reading are very good. If one cyclinder was to read 140 or lower then I would start to worry.
Old Mar 8, 2005 | 09:47 PM
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From: Flying on the H1 w/ 75 psi of compression on all 4 cyl
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?
Old Mar 8, 2005 | 10:18 PM
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Mario do you still have your original block and heads in? Assuming the CT was done right, I'm surprised you can pull away from a stop in that thing.
Old Mar 9, 2005 | 10:36 PM
  #6  
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From: Flying on the H1 w/ 75 psi of compression on all 4 cyl
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.
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