A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

What is the popping at the top of the RPM band

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Old Mar 26, 2012 | 08:01 AM
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Default What is the popping at the top of the RPM band

Im assuming its a form of backfire, but thought it worth the question to be sure, I made this while seafoaming my C5 4.2

www.youtube.com/watch?v=UtyxBVP5s1o[/url]

Last edited by Philhawtin; Mar 26, 2012 at 08:05 AM.
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Old Mar 26, 2012 | 08:04 AM
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sounds like exhaust rattle.

What is all that smoke coming out? Does seafoam do that?
If so, why would anyone use it?

You should never rev a motor until it is warmed up. Oil does not flow properly, and parts don't have the operating fit - they expand when hot.

G
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Old Mar 26, 2012 | 08:08 AM
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It cleans out the carbon build up from the valves, piston heads and combustion chamber. there are pics showing that it removes all but the discoloration on the top of the piston heads. The engine sounds healthier and throttle response is slightly improved. And that smoke is cleared in a very short amount of time
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Old Mar 26, 2012 | 08:17 AM
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Oh and you are right about the operating temperature, i had been driving around town for the previous 2 hours or so, im crazy about warming up my car before i go anywhere, that and oil changes.

Which in fact i did right before this. because another was to use the seafoam is you pour 1 can in your gas tank, (fuel injectors..

and you pour some in the oil. ( that is not where the smoke is coming from but has the same cleaning effect.) And where the smoke came from is i pulled a vac hose off of the intake manifold and slowly let the seafoam be sucked into the manifold. Turn off the motor for about 5-10 min, then clear as shown in the video
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Old Mar 27, 2012 | 04:32 AM
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So does techron. And has academic and industry papers behind it. And creates no smoke.

Actualyl so does a small amount of water vapor

G
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Old Mar 27, 2012 | 04:34 AM
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i *hear* a lot about seafoam. Anyone have *real* tech documentation on it that its any better than the tried and true products?

No zmax for me thanks.

G
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Old Mar 27, 2012 | 07:45 AM
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In the old days we used to dribble about a quart of straight water down the old 4-barrel carburetor while the engine was running at 3K rpm.......thermal shock/steam blasted intake valve deposits right off and also cleaned carbon out of the combustion chamber...pre-catalytic converter days.

The problem with physical methods (and some of seafoam is physical thermal shock) is that the operation often breaks of larger chunks of carbon/deposits that can clog the catalytic converter. Techron or gas with techrolene and the nitrogen Shell additive package doesn't do that.

I've found that using a gasoline that meets Top Tier specifications eliminates the carbon buildup problem.

http://www.toptiergas.com/
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Old Mar 27, 2012 | 11:08 AM
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i was thinking of exactly that. Although a quart (!) sounds like a great deal.

Today, i would have a vacuum hose suck a little in through a needle, just as some turbo kits do to quell predetonation.

I'm still passing on funny stuff that generates prodigious smoke.

G
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Old Mar 27, 2012 | 02:55 PM
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There definitely a lack of documentation, though the picture i saw of before and after was the selling point to me. i believe the picture i saw was here in the tech articles...

And the smoke only exists for such a short while there is no adverse effects, like prolonged smoking. or else it Would be a deal breaker.
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Old Mar 27, 2012 | 03:53 PM
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Originally Posted by SloopJohnB@mac.com
In the old days we used to dribble about a quart of straight water down the old 4-barrel carburetor while the engine was running at 3K rpm.......thermal shock/steam blasted intake valve deposits right off and also cleaned carbon out of the combustion chamber...pre-catalytic converter days.

The problem with physical methods (and some of seafoam is physical thermal shock) is that the operation often breaks of larger chunks of carbon/deposits that can clog the catalytic converter. Techron or gas with techrolene and the nitrogen Shell additive package doesn't do that.

I've found that using a gasoline that meets Top Tier specifications eliminates the carbon buildup problem.

http://www.toptiergas.com/

John, Your comment prompted me to do some digging.

http://www.newsnet5.com/dpp/news/loc...s-for-your-car
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