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Thread: Compression

  1. #11
    Join Date
    May 2011
    Location
    Ottawa, Ontario
    Posts
    1,347
    burning oil?
    could be you are using too thin oil.

    I had oil burning (new car) using 5w30. once I switched bk yo Suzuki rrcommened 10w30. problem solved. now higher mileage. there is some oil lost but not critical.
    2007AWD auto.200k km..K/N air filter,AUXinput,Grp34size Battery
    Fixes..alternator,swybarlnk,cntrlarm,innertierod,P wiperarm,Rexhaustjnt,Raxleseals,Ujoints,idler,tens ioner pulleys.

  2. #12
    Join Date
    Nov 2018
    Location
    South America (Tropical)
    Posts
    20
    I use oil 10w40 and when I measured engine compression I measured 160psi. If the compression is low means the car (engine) burning oil because of the problem with the rings.
    My car burning oil and I use oil 10w40, looks like I have a problem with the rings.

  3. #13
    Join Date
    May 2011
    Location
    Ottawa, Ontario
    Posts
    1,347
    could be valve seals, sests, abd valve itself.
    pls update your signature with current mileage.
    2007AWD auto.200k km..K/N air filter,AUXinput,Grp34size Battery
    Fixes..alternator,swybarlnk,cntrlarm,innertierod,P wiperarm,Rexhaustjnt,Raxleseals,Ujoints,idler,tens ioner pulleys.

  4. #14
    Join Date
    Nov 2018
    Location
    South America (Tropical)
    Posts
    20
    Thanks for your reply.
    All that you have written has changed. My car has 85,000 miles.

    About my 'signature' in this forum, I do not have the option to fix it my 'signature' probably because I'm a new user.
    Last edited by Brian84; December 5th, 2018 at 06:17 AM.

  5. #15
    Join Date
    May 2011
    Location
    Ottawa, Ontario
    Posts
    1,347
    check your pcv and valve cover for leaks
    2007AWD auto.200k km..K/N air filter,AUXinput,Grp34size Battery
    Fixes..alternator,swybarlnk,cntrlarm,innertierod,P wiperarm,Rexhaustjnt,Raxleseals,Ujoints,idler,tens ioner pulleys.

  6. #16
    Join Date
    Oct 2017
    Posts
    186
    I wouldn't worry much about there being *only* 160 PSI being indicated. Make sure you check all the cylinders.

    The reason I say not to worry about it is because there isn't much you can do about it, shy of tearing the engine down and rebuilding it.

    Some compression gauges are a piece of crap, and "low" compression is not necessarily an indicator of an engine's health. If it runs good, doesn't consume much oil, and gets decent fuel economy, then just run it.

    Compression figures are also not definitively indicative of how much oil it will consume. Sometimes they go hand in hand, sometimes not. My old Geo Metro was making a pretty normal 175 PSI on all three cylinders, yet went through a quart of oil in 500 miles.

  7. #17
    Join Date
    Nov 2018
    Location
    South America (Tropical)
    Posts
    20
    My engine spends around 1.5 - 2 liter for 3,000 miles. Engine compression 160 psi is a little bit for me because the new car has 200 psi (reading manual). I would accept up to 170 psi.
    In my case, it's time to change the engine rings.

  8. #18
    Join Date
    May 2011
    Location
    Ottawa, Ontario
    Posts
    1,347
    If you are going ahead replacing ring, seals, bearing plates etc. should take pic every steps to benefit other members
    2007AWD auto.200k km..K/N air filter,AUXinput,Grp34size Battery
    Fixes..alternator,swybarlnk,cntrlarm,innertierod,P wiperarm,Rexhaustjnt,Raxleseals,Ujoints,idler,tens ioner pulleys.

  9. #19
    Join Date
    Dec 2011
    Location
    Chicoutimi, Quebec, Canada
    Posts
    568
    Quote Originally Posted by phantomrt View Post
    I wouldn't worry much about there being *only* 160 PSI being indicated.......etc.
    I agree.....
    10:1 compression ratio means (14.7 psia (sea level) x 10)-1 = 132 psig at constant temperature (isothermic) but rapid compression causes temperature increase, tends toward adiabatic..hence a higher pressure is expected...but it depends on engine temperature, if compression is rapid, etc...so the exact value can vary.....
    FOr me....adding some oil from time to time....ehhh....extends the oil change interval ....
    But..brian, ..if you are in the mood for an adventure.....that is your choice, period. BUt keep us informed
    Last edited by LMP; December 11th, 2018 at 12:40 PM.
    2011 sx4 JX AWD CVT 35500km(May19) Also drives 2015 KIA Sorento AWD 2.4

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