Blue Smoke - Chevelle Tech
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post #1 of 34 (permalink) Old Oct 20th, 19, 5:56 PM Thread Starter
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Blue Smoke

Good afternoon everyone!

After my 65 (283 SS) warms up I get blue smoke out of the driver's side of the exhaust. Yesterday I did a compression check on only that side and came back with 120/105/115/125. Is it safe to say since this car previously spent a lot of time sitting in a garage that my valve seals are bad? Is it worth just doing seals before spending a lot of money on heads?

Thanks for the help.

Jacob

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post #2 of 34 (permalink) Old Oct 20th, 19, 6:20 PM
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Re: Blue Smoke

no smoke on startup after sitting overnight?

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post #3 of 34 (permalink) Old Oct 20th, 19, 7:52 PM
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Re: Blue Smoke

Were the compression tests done with all the spark plugs out of the engine, and the throttle held all the way open, WOT???

After start, how long does it take to "clean itself up" and stop smoking??

PC valve system in place and functional??

Blue smoke is usually having to do with bore and piston ring conditions, not valve guides.
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post #4 of 34 (permalink) Old Oct 20th, 19, 8:44 PM
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Re: Blue Smoke

Jacob,
Valve stem seals normally will cause a puff of smoke at startup and then go away. I am thinking you have something else going on. Probably not in the heads.
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post #5 of 34 (permalink) Old Oct 20th, 19, 8:45 PM
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Re: Blue Smoke

She's tired. Throw in a can of STP Oil treatment.
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post #6 of 34 (permalink) Old Oct 21st, 19, 3:08 AM
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Re: Blue Smoke

Quote:
Originally Posted by Dave Ray View Post
Were the compression tests done with all the spark plugs out of the engine, and the throttle held all the way open, WOT???

After start, how long does it take to "clean itself up" and stop smoking??

PC valve system in place and functional??

Blue smoke is usually having to do with bore and piston ring conditions, not valve guides.
Not sure how you would blow a piston.....?? Or even what that means for that matter.

I would lean more towards a turbo seal or something of that nature....

Blown piston.....hhhmmmm

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post #7 of 34 (permalink) Old Oct 21st, 19, 8:48 AM
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Re: Blue Smoke

I thought smoke on startup was valve seals, constant smoke while running was usually worn rings?
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post #8 of 34 (permalink) Old Oct 21st, 19, 9:29 AM
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Re: Blue Smoke

My wagonís 454 was doing that, it was the intake gasket on the passenger side.

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post #9 of 34 (permalink) Old Oct 21st, 19, 11:30 AM Thread Starter
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Re: Blue Smoke

Thank you everyone for the feedback. Start-up even after a week there is no smoke. Mainly notice it when stopped in gear.

Jacob
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post #10 of 34 (permalink) Old Oct 21st, 19, 11:32 AM Thread Starter
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Re: Blue Smoke

Quote:
Originally Posted by Geo71 View Post
My wagonís 454 was doing that, it was the intake gasket on the passenger side.
How did you figure out it was the intake gasket?

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post #11 of 34 (permalink) Old Oct 21st, 19, 11:34 AM Thread Starter
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Re: Blue Smoke

Quote:
Originally Posted by BillK View Post
Jacob,
Valve stem seals normally will cause a puff of smoke at startup and then go away. I am thinking you have something else going on. Probably not in the heads.
As much as it didnít want it to be rings, the compression test didnít come back like it lost a cylinder so who knows. Spark plugs look a little lean, but no oil on them at all.

Jacob
1965 Chevelle Malibu SS

Last edited by Jakedub79; Oct 21st, 19 at 11:50 AM.
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post #12 of 34 (permalink) Old Oct 21st, 19, 12:58 PM
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Re: Blue Smoke

So, I never suggested a "blown piston", I wanted the info to see if the crank case pressure was too high, pushing oils past worn components that would have worked correctly, IF the pressure was regulated correctly, BY A PROPERLY FUNCTIONING PCV SYSTEM, with lower crank case, valley and valve cover area pressures. For the record, with excessive crank case pressures, air/oil vapor can be pushed past worn rings and pumped into the combustion chambers, to be burned as the engine runs, and if there isn't a great volume of mixture being pumped into the chan=mbers, the plugs could handle the burn off of the small volume of mix.

As I said, I NEVER suggested a blown piston.

And, a compression test with the throttle closed to its idle position, is not accurate, gives low numbers, as seen on this engine.

And, a 1965 engine, with some sort of factory turbo having a blown seal, come on, nothing was said like that at all.

Another area that might, LONG SHOT, be an issue, if, and this is a giant IF an automatic transmission was allowing air/oil to migrate up a blown vacuum modulator hose into the base of the carb, or inlet manifold, but you'd expect to see that in all 8 cylinders. OP says the plugs are clean. Blue smoke isn't indicative of calves leaking, whiter smoke is, could be exhaust valves only, leaks into exhaust ports, doesn't alter plug cleanliness, other areas.
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post #13 of 34 (permalink) Old Oct 21st, 19, 12:58 PM
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Re: Blue Smoke

Quote:
Originally Posted by Jakedub79 View Post
How did you figure out it was the intake gasket?
Took the plugs out on both sides and the pass side were coated with oil. Took the carb off and looked down the runners with my camera and could see oil in there.

Took the intake off and could see where it was leaking. Ran the intake to the machine shop and had it checked for straightness...it wasn't. This was the third manifold that i had to have planed to make it straight. Put it back together and took awhile to burn the oil out, but now its fine.
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post #14 of 34 (permalink) Old Oct 21st, 19, 1:18 PM
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Re: Blue Smoke

Dave, I should have "had your 6" on the "blown piston". That's the sort of imaginary thought that happens after hitting a pipe, another form of blowing a piston, I suppose. And I almost called him out on it.

Dont let those who lack a handle on reality screw with you bud.

Jacob, the other way to see if the intake is leaking is to uncover the breather ports and place a piece of paper or tissue over one of the breathers to see if its sucking in. This + my #4 plug being sooty as sin, lead to a intake gasket leaking from the galley into #4 runner. Knew what to expect when I popped that intake off.

I DO NOT think that is your problem UNLESS one of the odd # plugs is very sooty and/or oil caked. Its an "old age" problem, judging by the relatively low compression #s as Dave Ray alludes to.

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post #15 of 34 (permalink) Old Oct 21st, 19, 1:23 PM Thread Starter
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Re: Blue Smoke

Quote:
Originally Posted by Geo71 View Post
Took the plugs out on both sides and the pass side were coated with oil. Took the carb off and looked down the runners with my camera and could see oil in there.

Took the intake off and could see where it was leaking. Ran the intake to the machine shop and had it checked for straightness...it wasn't. This was the third manifold that i had to have planed to make it straight. Put it back together and took awhile to burn the oil out, but now its fine.
Were the plugs oiled all over of the threads or tip?

Jacob
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