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How is it possible not to see smoke?

Posted by tk106, Nov 17, 2019

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  1. tk106

    tk106 Supporting Member

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    I’ve had to add 1/2 quart of oil in three fill ups so > 600 miles. No leaks externally. Dual catch can, pcv with dual check valve and vent to pre turbo, and there’s only a few ounces of oil and water in the catch can.

    Plugs are good

    Compression is 120 110 110 100

    The top of the piston is def wet, not soaked.

    But I never see it smoke, start up, driving and in boost. My wife was driving behind me and she said it doesn’t smoke. I know I need new rings. Just curious why it doesn’t smoke. And shouldn’t the plugs be covered in oil?

    5EFC1583-5EF4-4EFF-BE50-E82D6AE9FC9A.jpeg A3E08390-F1D3-49C4-A9E4-15B243DC48D6.jpeg
     

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    1992 Eagle Talon TSi AWD
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  2. Brembo

    Brembo Proven Member

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    Are those compression numbers on cold or hot engine? I think you need to do a leak down because those number are way low in my opinion. I had a case at work that customer complaint was oil consumption and it turned out to be cracked ring lands. The only problem visually was when you remove the oil cap, smoke came out. No misfires and plugs were relatively dry, no smoke out the tail pipe that could be noticed. I will mention that pcv system needs to function properly in order to diagnose consumption issues. Meaning that's where you should start as it is a cheap thing to do. You can also measure how much crank pressure or vacuum you have. Also I will add leak down and compression numbers were not bad on that car. It was under warranty so we replaced the block and opened it up and found cracked ring land. Very interesting topic. Please post your findings as my Chykalo eats 2qts between oil changes. I am scarred to pull the pistons. My compression numbers are 165 on hot across the board tested 3 years ago last. Another part that could eat oil is turbo. I ruled mine out as I changed it.

    I will add that I never did leak down as my dsm is not my DD.
     
    Last edited by a moderator: Nov 17, 2019

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  3. tk106

    tk106 Supporting Member

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    Those numbers are cold and dry. I did a leak down test a while back, no gauge just air in into the combination chamber. Can’t remember if it was before or after rebuilding the head. Anyway, I heard air coming from the oil cap.

    My pcv system is fine. I have two one way check valves.

    I know the numbers are low and I will eventually rebuild the bottom end.
     

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    2000 Jeep Cherokee Sport - Classic
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  4. motomattx

    motomattx Proven Member

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    A half quart in 600 miles likely wont make smoke, thats actually not considered excessive by manufacturers standards these days, a quart every 1500 is considered to be acceptable.
     

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  5. 95_gsx_2g

    95_gsx_2g Supporting VIP

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    I'm not a professional but those are definitely low compression numbers. Plugs look good color to me. The engine must be a bit worn or higher mileage I would assume? Youll be happy with a good rebuild. As said above a worn turbo with shaft play can definitely cause smoke or bad valve seals. But no smoke is a good thing in my opinion. As for the can I prefer vented on a dsm but recirculated isnt bad especially with good baffling and check valves!
     

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  6. Brembo

    Brembo Proven Member

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    This man speaks the truth. Vw and Audi 1qt in 1k miles is normal. They try to hide it for a long time. No wonder they had rings recall. Hahaha
     

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  7. tk106

    tk106 Supporting Member

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    Matt, that’s unacceptable by yesterday’s standards.

    Turbski is good, no play and no oil in exhaust or intake. Also new valve seal installed 700ish miles ago when I rebuilt the head

    I worked for vw for a couple of months. Oil consumption and electrics were an every day complaints. Also worked for Toyota for most of my service adviser years. The only oil consumption issue they had was for their 2000 v6 engines due to poor oil passage causing sludge build up. I get that our engines will use oil but it just seems a bit too much to me. What I don’t understand is why I don’t see it.
     
    Last edited by a moderator: Nov 17, 2019

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    2000 Jeep Cherokee Sport - Classic
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  8. BLACK'98DSM

    BLACK'98DSM Proven Member

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    The plugs wouldn't be wet with oil because it would burn off by the time you pulled them out to inspect. Unless you had a terrible oil consumption problem, which you don't.

    The Subaru STI engine requires a full quart of oil to be added every 1k miles. Because the cylinders point downward. (which is absolutely retarded)

    If you're going to rebuild it then I wouldn't even worry about it until then.
     

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  9. 95_gsx_2g

    95_gsx_2g Supporting VIP

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    That's good well it just sounds like you need a good solid rebuild on the block! I'm always happy to see a non smoking dsm I dont even like rich tunes that cause fuel smoke under load LOL
     

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  10. motomattx

    motomattx Proven Member

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    When I say by today's standards I'm talking about everything newer than the 1950's, LOL Mistubishi would tell you that you have no problem.
     

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  11. tk106

    tk106 Supporting Member

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    I know Solomon. Don’t want to tear it down any time soon. Just annoyed it’s drinking oil for a living.
     

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    2000 Jeep Cherokee Sport - Classic
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  12. Santi714

    Santi714 Probationary Member

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    I had a similar issue with my 95 Tsi, changed turbo due to excessive shaft play and problem was solved. Then my boost controller failed, spiked at 30lbs from the normal 21 i was running and well we all know what gotta leash and walked home after that !!! hahahaha
     

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  13. tk106

    tk106 Supporting Member

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    I’d speak to the service manager and regional rep and make them warranty a new motor. Lol
     

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    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    170  4

    93 Civic 4 Door -sold-
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    1992 Eagle Talon TSi AWD
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  14. tk106

    tk106 Supporting Member

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    Me neither. I see a street car that smokes and my mind tells me it’s junk. It’s not always the case but my mind just goes there.
     

    167  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    170  4

    93 Civic 4 Door -sold-
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    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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    Santi714 likes this.
  15. tk106

    tk106 Supporting Member

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    I wish it was the turbo
     

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    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    170  4

    93 Civic 4 Door -sold-
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    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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    Santi714 likes this.
  16. Santi714

    Santi714 Probationary Member

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    Always gotta pray for the easy fix even if it you know the motor has a hole in it and the pieces of the piston is sitting on the floor surrounded by a gang of fresh oil ya just put in ROFL
     

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  17. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I understand.

    I guess not everybody is as enthused to break sh** as me?
     

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  18. Santi714

    Santi714 Probationary Member

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    Bro, thats my favorite part. If i only rebuilt the motor once i would feel cheated out of a TRUE DSM Experience hahaha
     

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  19. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Not just the motor, literally ever piece that makes the car go ROFL
     

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  20. Santi714

    Santi714 Probationary Member

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    I remember my first heater core!! Holy FML haha Twas Fun
     

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