New engine smoking
#711389
05/30/10 11:58 AM
05/30/10 11:58 AM
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Joined: Jan 2004
Posts: 1,250 North Carolina
469runner
OP
pro stock
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OP
pro stock
Joined: Jan 2004
Posts: 1,250
North Carolina
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408 small block. A mild build, roller cam, EQ magnum heads, Mopar M-1 intake. Made 420 HP, 450 lb/ft on dyno. Blows blue smoke, lots of it. Inside of tail pipes are oily. Plugs don't look too bad, and engine runs well. I pulled intake and checked alignment, all was well. Intake ports were clean. Heads are brand new as are valves etc.. I'm at my wits end with this thing. It smokes at idle and upon deceleration from a higher speed, then on to gas gives a big puff of BLUE smoke. So its definetly burning oil. I'm going to try changing valve seals. Opinions? Any chance rings are not seated, even though makes good power? Thanks!
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Re: New engine smoking
[Re: 73Rallye]
#711397
05/31/10 10:44 AM
05/31/10 10:44 AM
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Joined: Sep 2006
Posts: 420 Central Ohio
Ledman_70
mopar
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mopar
Joined: Sep 2006
Posts: 420
Central Ohio
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I read the break-in article, but if applied to our motors, it doesn't take one thing into consideration....the cam break-in. I've always read you should break in your new engine at 20-30 minutes at 2000 rpm to keep from wiping the cam. Hard acceleration/decceleration is not possible using this technoque. What do you guys think?
Jeff Adams
64 426 Polara
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Re: New engine smoking
[Re: fury4speed]
#711399
05/31/10 02:10 PM
05/31/10 02:10 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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You said the intake ports were clean. How did the backs of the valves look. If they were coated with black tarry looking stuff, it's bad valve stem seals. If they were as clean as the runners, you have a ring problem. Leak down test will tell you for sure. Even a new motor with rings yet to seat should not be smoking like a chimney.
Fastest 300
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Re: New engine smoking
[Re: Boise Chall]
#711405
06/01/10 12:41 PM
06/01/10 12:41 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Do you have a picture of the cylinder walls before the ehads went on? If not, can you find out what the honing stone combination used on your engine by the shop was? Smoking is usually one of three things: Intake fitment and you'll see the marks and oil in the ports and it will smoke all the time, worse on deceleration. Intake valve guide/seal issues and as said you'll see it on the backside of the intake valve and the piston top and again, worse on cold starts and deceleration. Last is ring seal... You can tell by looking at the hone finish if it's too rough for modern rings. Top rig seals compression and should seat during cam break in. Second ring is the main oil scraper and should seat shortly after cam break in. Oil rings remove the major oil off the walls and they may take a few miles to seat. If the rings are bad, you'll see it in the leakdown. Symptoms are smoking all the time, excessive blowby showing out the breather/pcv grommets when running (oil in breather or wet oil in PCV) and PCV disconnected from carb (plug vacuum nipple on baseplate) and oil on the piston tops.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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