Hi guys,i am a fellow muscle car fanatic of 40 + yrs now from Team Chevelle & am new to your forum but am not the enemy so please dont shoot me. (LOL!!!!)
I like Pontiacs too,my father sold new Pontiacs from 1958-62 before he went out on his own to sell cars till 1984 when he had enough and thru in the towel so Pontiacs are in the blood.
I just finished totally rebuilding a set of tripower carbs off my friends #'s matching 66 GTO 4spd,its a buitifull car for sure.
Anyway i ran into this BonAmi thing here in your forum and wanted to pass along some 1st hand info a few my fellow t/cer's had to say on the subject in case it would be of some use to you. Between the info here in your forum and from t/chevelle it sure lookes like this BonAmi thing can really correct a ring seal issue in some cases with a new/freshly rblt motor.
Have a good one....Scott
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This statement below is from a very well respected hi perf engine builder in the buisness for a very long time with a great reputation:
I have seen the old BonAmi trick work ,many years ago it was used to seat Chrome rings which could be a real bitch to get to seat at times or so it seemed.
The way it was done was either to sprinkle a small amount into the air stream at high idle like 2500 to 3500.
Or you could mix the BonAmi in some water in an old coke bottle like a teaspoon to a half bottle of water. Same deal, hold the engine to 2500-3500 & pour the water into the carb slowly so as not to drop the RPM much.
The water will also clean the crap out of the cylinders just like some of the commercial stuff sold,ever notice how clean a cylinder with a blown head gasket ends up?
That said the best thing is to pull the engine apart & ball hone the cylinders but the BonAmi or equivalent is worth a try first,hopefully they didnt use low tension rings or something.
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Re: Bon Ami for you old '55 Chevy's - A comment from Chevrolet to SAE
--- In
[email protected], hobot <hobot@...> wrote:
>
And word soon got out that, yes, early Chevrolet V-8s did have one
> big bug: their rings were slow to seat, so the engines tended to
burn oil. Mechanics soon learned to pour a little Bon Ami in water
down the carburetor, which speeded break-in and ultimately solved the
> oil-consumption problem.>
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I have personally never done it. But I know it was used back when very hard chrome rings were popular and propane only engines were built. It was dang tough sometimes to get the rings on these to seat. And I have an old IMPCO technical manual that shows feeding an engine the Bonami to "help" the rings.
I've built some dual fuel engines for pickups around here back in the early eighties, we were always careful to get a few thousand miles on gasoline before running the propane extensively.
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There are two kinds of Bon Ami. "Cleanser" in the gold foil container and "Cleaning Powder" in the yellow container. Not the same stuff. I've used the cleaning powder on my windshields before giving them the Rain-X treatment. Doesn't scratch glass. Never tried on chrome, but I'd guess its OK.
The "Cleanser" is more agressive. I definitely would not use it on glass or chrome.
I heard the "Bon Ami to seat rings" story in high school auto shop back in 1961. Never took it seriously.
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My first garage job (in the late 60's) was rebuilding construction equipment. We used bonami to get the rings to seal and get the equipment back into service to make $ for the owners. Not something I'd do today
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