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Bon Ami 'Trick'

Vince Lupo
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Bon Ami 'Trick'

Post by Vince Lupo » Mon Dec 28, 2009 9:47 am

Not that I need to do this, but just curious....

Has anyone ever tried this 'trick' using Bon Ami cleaner to help rings to seat? Supposedly if there is glazing on the cylinder wall that prevents the rings from seating properly, you can shoot some Bon Ami into the carb intake, and it deglazes the cylinders and seats the rings.

Anyone heard of it, or tried it???

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G-Man
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Post by G-Man » Mon Dec 28, 2009 10:09 am

Vince

What's Bon Ami? Some kind of acid-based cleaner? It might make more of a mess of your carbs than de-glaze the bores.

Are you supposed to do it with the motor running? I can't see it getting into the cylinder without the engine running. But if it was running the stuff wouldn't have time to do anything with the bore before it got blown out through the exhaust. As they say on my favorite TV show. Implausible......

G
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Vince Lupo
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Post by Vince Lupo » Mon Dec 28, 2009 10:23 am

It's a very fine cleanser, and while the engine is running, you're supposed to put a teaspoon or so in the palm of your hand and hold it close enough to the intake port so as to let it gradually be drawn into the cylinder. It's supposed to deglaze the cylinder and help the rings reseat themselves. And you're supposed to specifically use Bon Ami, and not just any cleanser.

As I say, it could be just some urban myth that really doesn't work, but if someone has actually tried it, I'd be curious to hear if it solved the problem.

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305
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Post by 305 » Mon Dec 28, 2009 11:55 am

i have heard that chevy had a ring sealing problem with the first 265 V-8's in 1955 , supposedly the problem was that the crosshatch applied by the cylinder hones at the factory was not complimentary to the chrome rings that Chevrolet used in their new engine. Bon Ami was the fix according to some old time mechanics i've talked to
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DONZIE
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Post by DONZIE » Mon Dec 28, 2009 6:52 pm

OK I admit it, many many many years ago at a much earlier age I did try this on a bike that had just been overhauled but the rings would not seat. Nope it did not work for me

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davomoto
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Post by davomoto » Tue Dec 29, 2009 2:42 pm

Don, big of you to admit to that one! Thanks for the info, before one of our more foolhardy members actually tried it!

davomoto

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G-Man
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Post by G-Man » Tue Dec 29, 2009 3:56 pm

Ford used to have a lightly abrasive 'running in oil' Not sure I would want to put that in an engine either....

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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