[TR] [6pack] Carbon/run-on/octane rating

[Bob]

I had a run-on problem and started using premium gas.
Run-on went away. Car is a '71. I have not checked the compression and I
don't know if there is any carbon buildup on the pistons.
Regards,
Bob
----- Original Message ----- 
From: "Sally or Dick Taylor" <tr6taylor at webtv.net>
To: <ggelhar at earthlink.net>
Cc: "triumphs" <triumphs at autox.team.net>; <6pack at autox.team.net>
Sent: Monday, May 05, 2008 4:24 PM
Subject: Re: [6pack] Carbon on top of pistons - engine experts please help!


> Greg----I have also read at least one article about the results of
> "steam cleaning" the combustion area. Since I already have a working
> water injection system, I gave it a try. I was already going to do a
> rebore, so any damage that might have resulted from breaking loose the
> carbon could be later dealt with.
> A mixture of soapy water and isopropyl alcohol was run thru the intake
> manifold until the pump had emptied two quarts of water. (About 5
> minutes with my injection nozzle) This with an engine speed of around
> 2,000rpm.  Lots of dirty water came out the exhaust pipes, but when
> later removing the head, found the piston tops to be firmly holding onto
> elixar of carbon.
>
> The only way I would now believe this process to work would be to see a
> "before and after" look at this area.
>
> I will admit that I never did have a run-on issue, so it could be that
> this process could remove some sharp corners that were holding carbon.
> So far as cleaning off the pistons tops...nope!
>
> Dick
>
> Greg wrote:
> I was re-reading an article printed in a club newsletter from the
> distant past about an old time mechanic who recommended water injection
> to eliminate this problem. His technique was to remove the air cleaner
> assembly and use a pump-up garden sprayer and spray water into the
> carburetor while the engine was operating at 2000 RPM. The premise was
> the steam generated by the water would clear the carbon from the piston
> tops. The amount of water was regulated as to not stall the engine. He
> reported that after this treatment the run-on problems were gone.
>
> Does anyone have any thoughts to the validity of his actions?
> Greg Gelhar
> 1973 TR6
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