STi smoke from crankcase and exhaust.....
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This is a discussion on STi smoke from crankcase and exhaust..... within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hello, I posted about a week ago about a somewhat similar subject but just wanted to see what yals thoughts ...

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    STi smoke from crankcase and exhaust.....

    Hello, I posted about a week ago about a somewhat similar subject but just wanted to see what yals thoughts are on this.
    Car:2005 STi (built motor) Dom. 3 turbo, bigger injectors, colder plugs, Cp pistons, and full catless exhaust and more.

    Basically the car starts up with no problems and the oil and coolant look fine without any weird milky liquids or anything like that.
    The car has plenty of power in every gear so it isn't down on power either, but the car does seem to blow some greyish/ alittle blue smoke from exhaust when full throttle from exhaust(nothing like a freight train but just alittle bit. So then I look at the crankcase while the car is running and there is smoke that comes out from there but it isn't puffing out but lingers out but has the normal air puff from the crankcase. Also when you turn the car off then check the crankcase the smoke is gone. Does this sound like bad rings? cause the car does not smoke at idle or normal driving, only when you get all the way on it.

    thanks.

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    Moderator Donkey's Avatar
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    Do a compression test......
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    ^^^

    Also could be normal for built motors until they're warmed up.

    But you won't know until you do a compression test...just because it doesn't feel like it's low on power doesn't mean it isnt
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    this is what the car is doing but minus the flame

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    bump....

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    Village Idiot McBill's Avatar
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    The exhaust smoke you are speaking of and showed in the video is typical of any tuned car. This is just carbon and is a result of unburnt fuel. Nothing to be worried about. Also, depending on the severity of the smoke from the crank case it may be fine. A little bit of smoke is ok, but only a little bit. The only way to be sure if the rings are ok is to have a compression test done.

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    ok thanks, compression test was 120 across all 4 cylinders

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    Quote Originally Posted by substi555 View Post
    ok thanks, compression test was 120 across all 4 cylinders
    Was this warm or cold?
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    Warm but I was told that your looking for more of a consistency of the same number rather than just saying it needs to be between 140-170

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    Quote Originally Posted by substi555 View Post
    Warm but I was told that your looking for more of a consistency of the same number rather than just saying it needs to be between 140-170
    That is true, but those compression numbers are low.
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    so is something wrong here and I need to stop driving the car and get new rings? like I said the car doesn't blow some out unless its full throttle.

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    Yes it sounds like there is some ring wear, especially if you are seeing smoke from the crank case. The lowish compression supports this. However, it doesn't sound like you have much cross-compression, you're not consuming a lot of oil or coolant, so I'd just let it be.
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    so basically it should be alright then? I mean I know these cars like to burn a little oil here and there and especially since this is a built motor I would think the blow by and cause a little by the forged piston clearance. The car makes 440whp, So assuming this I would think a little bit of smoke(like in the video) is somewhat normal for turbo cars isn't it? I see a lot of evo's and sti's that are making high power numbers have some smoke out the back when getting on it on youtube. Im just a little freaked out sorry.

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    Quote Originally Posted by substi555 View Post
    so basically it should be alright then? I mean I know these cars like to burn a little oil here and there and especially since this is a built motor I would think the blow by and cause a little by the forged piston clearance. The car makes 440whp, So assuming this I would think a little bit of smoke(like in the video) is somewhat normal for turbo cars isn't it? I see a lot of evo's and sti's that are making high power numbers have some smoke out the back when getting on it on youtube. Im just a little freaked out sorry.
    You could lessen your blowby and loss of oil (if it's noticeable enough to warrant this) by setting up an AOS or two in the PCV system.
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