Black smoke at high rpm - Page 5 - Alfa Romeo Bulletin Board & Forums
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post #61 of 63 (permalink) Old 10-23-2016, 06:47 PM
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Pressurize a cylinder that is at TDC, compression and listen for air leakage in the dipstick tube with a stethoscope to identify ring leakage. Listen in the tail pipe for exhaust valve leakage and in the airbox for intake valve leakage. Valve seal leakage is harder to identify but it is less of a concern.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #62 of 63 (permalink) Old 10-10-2018, 02:11 PM
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Were you ever able to solve this ever?

Thanks
Alessandro

Learning, learning..
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post #63 of 63 (permalink) Old 10-10-2018, 04:11 PM Thread Starter
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Oh yes. The smoke black or gray on occasion was the engine being very tired. I went to an AutoX and it layed down trails of smoke which got worse and worse. The engine had been resurected from an unknown condition and clearly needed a rebuild.

I set about that in this thread:
https://www.alfabb.com/bb/forums/eng...0-rebuild.html

When I tore down the head I could wiggle the valves in their guides. They were really worn.

It doesn't smoke anymore and makes more power than ever

68' Parisian Alfa GTV 1750
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