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Thread: Just got the Teg back from a compression test

  1. #1
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    Default Just got the Teg back from a compression test

    1 - 175
    2 - 170
    3 - 165
    4 - 170

    phew! rings are still good. Now I know it was the old PCV valve was causing the oil loss + blue smoke at high rpm.

    I guess I also needed new spark plugs so those are in.
    The mechanic said that one of my axle boots are torn and the other is cracked but not leaking. I'm getting those boots replaced soon now.

    Yaaaaaa, no expensive rebuild.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  2. #2
    Dirty_SOHC's Avatar
    Dirty_SOHC is offline 0.2 liters away from a good engine
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    Where did you take it and how much was the test.??? I think I may need one done. Thnxs Graham

  3. #3
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    Ron's Propane Ltd.
    Bay 7,3815 - 61st Ave S.E.
    236-5535

    4 plugs
    comp test
    oil + service
    = $91.00
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  4. #4
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    those compression numbers seem pretty high for a ls engine.

    i compression tested my engine with a $50 self tester. some how i got 185psi on all 4. i think i did it worng...

  5. #5
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    My car has a CR of 9.2:1 !! that's loooooow.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  6. #6
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    Originally posted by Ekliptix
    My car has a CR of 9.2:1 !! that's loooooow.

    Ahaha, mines 8.3:1
    Travel

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    isn't the stock compression only around 9.6?

  8. #8
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    nope:

    http://www.g2ic.com/specs.html



    my dad's porsche is 7.0:1
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  9. #9
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    Compression numbers depend on how the test was done, u can get 240 on all 4 cylinders, it just depends on how many times u crank it over. U can still have done rings and get normal compression numbers, theres so much carbon buildup in the cylinders that it shows good compression. I think the only thing a comp test is good for is showing a loss of comprssion in one or 2 cylinders. Like if u blow your engine it could look like 185 185 43 185. A blown head gasket could look like 175 175 132 175.
    Last edited by legendboy; 09-14-2002 at 10:01 AM.
    Machining, Fabricating, Welding etc.

  10. #10
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    I just found this too:
    "You can have good compression and still be blowing tons of oil through the rings.
    There are 3 sets of rings on your pistons...

    Compression Rings
    Oil Control Rings
    Oil Scraper Rings

    I am way too tired to go into detail of how each of them work, but they each do their own part in making the bottom end of your engine work right.

    I have a 91 LS with 180 all the way across on my compression test and I am still blowing through 1-2 quarts of oil every week."

    If I am still using oil, I'll get a leakdown test to ID the source.
    Current Cars:
    1970 Chevy Blazer, 2wd
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2003 BMW X5 4.6IS Doushmobile
    2004 GMC 2500HD 8.1L Snow plow, dog hauler

    Past Cars:
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  11. #11
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    A leakdown test is about as good as a compression test , if ur burning oil at high revs ur rings are shot, if u burn oil when u start the car up its your valve seals, The only way to be sure is take your engine apart and measure the tolarances!
    Machining, Fabricating, Welding etc.

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