Blue smoke puff between shifts
11-21-2016, 04:19 PM
#1
Drifting
Thread Starter
Blue smoke puff between shifts
After a little research I found what I was looking for:
https://www.corvetteforum.com/forums...post1586787556
I knew I read it somewhere. I have the same issue. The only thing that puzzles me is that my heads are new as of last year. Maybe 2000 miles on them. So I would wonder why the guides/seals would be bad on such low mile heads. These are Summit Vortec heads.
Anyways I will tear into this in the next days/weeks starting with the plugs, compression, leak down etc.
Thanks!
Originally Posted by yyz1970 View Post
Thanks for the input
I did another dry/wet compression test with good results
after running it today I did find a puddle of Oil on the intake manifold under the throttle linkage
I'm going to pull the intake and try a new gasket
Has anyone experienced a leaking intake causing Blue smoke?
Yup. More than once. If you have an intake runner to cylinder head gasket leak on the lower side of the intake runner, it will indeed draw oil into that runner. If this happens, that cylinder in question will undoubtedly be burning oil, easily proven via spark plug inspection.
A rule of thumb taught to me by an old timer goes like this:
If it smokes under constant acceleration, it's the rings. If you wind the engine up driving down the road and let off the gas in gear, then let it wind down on it's own, then hit the gas pedal again. If it smokes then, it's valve seals/valve guides, ect. Under deceleration, bad valve seals of guides will "draw" oil into the cylinder and smoke when you hit the gas.
Thanks for the input
I did another dry/wet compression test with good results
after running it today I did find a puddle of Oil on the intake manifold under the throttle linkage
I'm going to pull the intake and try a new gasket
Has anyone experienced a leaking intake causing Blue smoke?
Yup. More than once. If you have an intake runner to cylinder head gasket leak on the lower side of the intake runner, it will indeed draw oil into that runner. If this happens, that cylinder in question will undoubtedly be burning oil, easily proven via spark plug inspection.
A rule of thumb taught to me by an old timer goes like this:
If it smokes under constant acceleration, it's the rings. If you wind the engine up driving down the road and let off the gas in gear, then let it wind down on it's own, then hit the gas pedal again. If it smokes then, it's valve seals/valve guides, ect. Under deceleration, bad valve seals of guides will "draw" oil into the cylinder and smoke when you hit the gas.
I knew I read it somewhere. I have the same issue. The only thing that puzzles me is that my heads are new as of last year. Maybe 2000 miles on them. So I would wonder why the guides/seals would be bad on such low mile heads. These are Summit Vortec heads.
Anyways I will tear into this in the next days/weeks starting with the plugs, compression, leak down etc.
Thanks!
11-22-2016, 01:27 AM
#2
Team Owner
If you get better at speed-shifting [power shifting], you won't have time for any 'blue smoke'. 
Last edited by 7T1vette; 11-22-2016 at 01:28 AM.
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jim-81 (11-22-2016)