White smoke at higher RPMs - Team Camaro Tech
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post #1 of 11 (permalink) Old Jun 5th, 14, 05:17 PM Thread Starter
Travis
 
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White smoke at higher RPMs

I have a 68 with a 327. I have had it a few months. I know I have a small oil leak. Today I took it to work and on the way home on the highway I opened it up some and around 80mph in 4th gear I had plume of white smoke come out the back. When I let off the gas it stopped. I tried it again and it did it again. Other than that, the engine seems to be running fine. What is it and/or what do I need to look for? Thanks Travis
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post #2 of 11 (permalink) Old Jun 5th, 14, 05:20 PM
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Steve
 
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Re: White smoke at higher RPMs

White smoke can be antifreeze. I would start with checking the intake gaskets for a leak.

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post #3 of 11 (permalink) Old Jun 5th, 14, 05:27 PM
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Chad
 
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Re: White smoke at higher RPMs

Quote:
Originally Posted by nashcar View Post
White smoke can be antifreeze. I would start with checking the intake gaskets for a leak.
X2....check your coolant levels as it may be leaking into the combustion chamber. Could be a blown head gasket.

67 Black RS Coupe, 383, M21 & 10 Bolt Posi. Edelbrock E-Tech 170 Heads, 2204 Roller Cam, Air Gap Intake.
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post #4 of 11 (permalink) Old Jun 5th, 14, 06:25 PM
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Re: White smoke at higher RPMs

I'll be very interested when and what you find out. My Wife's 67 Firebird w/ a 326 would do the exact same thing. I decided to yank it out and put in a Chevy 350. I am finishing it this Saturday. I t only happened around 80 mph or if you stomped on it and stayed in it all the way (high rpm range). Oil was always clean but changed regularly and never noticed a loss of antifreeze.

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post #5 of 11 (permalink) Old Jun 5th, 14, 09:31 PM
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Tim
 
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Re: White smoke at higher RPMs

Is there any milky residue on the underside of the oil filler cap?

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post #6 of 11 (permalink) Old Jun 7th, 14, 12:49 AM
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Re: White smoke at higher RPMs

Quote:
Originally Posted by 68resto View Post
I'll be very interested when and what you find out. My Wife's 67 Firebird w/ a 326 would do the exact same thing. I decided to yank it out and put in a Chevy 350. I am finishing it this Saturday. I t only happened around 80 mph or if you stomped on it and stayed in it all the way (high rpm range). Oil was always clean but changed regularly and never noticed a loss of antifreeze.
Sacrilege! Should have dropped in a 455

More seriously I'd think it was oil rather than coolant if it wasn't losing coolant. In the rear view, light blue may look white.
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post #7 of 11 (permalink) Old Jun 7th, 14, 04:57 AM
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Garth
 
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Re: White smoke at higher RPMs

I think it sounds like oil, it's really difficult to see while your hanging on the steering wheel and looking in the rear view at smoke all at the same time.

Have someone follow you when you do this. See if it's from the tail pipe or under the car. Your small oil leak may get larger under pressure. If the crankcase isn't venting properly it will push extra fluid and the it gets on the hot parts and you have smoke.

If it's coming out the tailpipe you have different things to look for. If you have real dual exhaust with no cross over you'll be able to narrow down what bank it's coming from pretty quick too.
- antifreeze - your 'spotter' should quickly see it evaporate, it's water.
- oil - it's either pulling past rings or valves.
- oil - could be pulling it in through PVC

Look hard enough and you'll figure it out. If I was working on the car I would leak test the engine. Pressurize and close each cylinder, see where the air comes out.

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post #8 of 11 (permalink) Old Jun 7th, 14, 07:24 AM
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Re: White smoke at higher RPMs

Could be pulling oil though the pvc

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post #9 of 11 (permalink) Old Jun 13th, 14, 09:56 PM Thread Starter
Travis
 
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Re: White smoke at higher RPMs

Thanks Everyone. I am looking into it.
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post #10 of 11 (permalink) Old Jun 15th, 14, 04:21 PM
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Re: White smoke at higher RPMs

If its auto trans, can also be sucking trans fluid
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post #11 of 11 (permalink) Old Jun 16th, 14, 05:10 AM
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Re: White smoke at higher RPMs

Pull the plugs and they'll tell you whether it's oil or coolant.

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