Anyone try Seafoam?

[vze28h54 at verizon.net (Chris)]

Thanks Larry.

Just found a good article on the subject.  Seems like the end result of 
each can be pretty much the same. Although it seems possible that 
preignition could be worse as it seems more likely to occur before top dead 
center and "operate" more toward the center of a piston, where the piston 
is likely to be thinner and have less support, and thus increase the 
chances of blowing a hole in the top of the piston. It also seems that 
detonation is more likely to occur later, perhaps often after top dead 
center, and to operate more toward the outer edges of the piston. However, 
if your piston is destroyed it's probably no consolation that it was done 
by one and not the other.

It also explained how an aluminum piston that melts at around 1380 degrees 
F. can survive when exhaust gas temperatures reach 1600 degrees F.

Chris

At 06:53 PM 04/26/2004 -0700, Larry wrote:
>I would be happy to expound, Chris.
>Pre-ignition:  Ignition of the air/fuel mixture in a cylinder BEFORE the
>spark occurs.  This is caused by a hot spot (usually carbon) acting like a
>glow plug, is uncontrolled, and gives the same end result as WAY advanced,
>random ignition timing on that cylinder.  If this is bad enough, it can
>cause the engine to continue running after the ignition is shut off, at
>which point it is called "run-on" or "dieseling".
>Detonation: The uncontrolled explosion of the final portion of the air/fuel
>mixture AFTER normal ignition has been initiated by the spark.  It is caused
>by the sudden raising of cylinder pressure from the flame front, to the
>point where it lights off (just like a diesel) the air/fuel mixtures that
>are in the combustion chamber's dead spots. It is the reason "squish" is
>incorporated in many combustion chamber/piston designs (to eliminate the
>dead spots). This is the result of fuel with too low an octane rating for
>the compression ratio, ignition timing that is too far advanced, lugging the
>engine, or any combination of the above.
>   The terms are used interchangably so often because it is often difficult
>to distinquish between the two. But they are different, and caused by
>different things.
>
>Larry
>
>
>----- Original Message -----
>From: "Chris" <vze28h54@verizon.net>
>To: "'Scirocco E-list'" <scirocco-l@scirocco.org>
>Sent: Monday, April 26, 2004 11:16 AM
>Subject: Re: Anyone try Seafoam?
>
>
> > Many use the terms interchangeably. Please expand on their differences
> > Professor.
> >
> > Chris
> >
> > At 04:42 PM 04/15/2004 -0700, Larry wrote:
> >
> > >Actually, ahem, hot spots in combustion chambers do not cause detonation.
> > >They CAN, however, cause pre-igition....a completely different phenomena
> > >with similar results.
> > >
> > >Larry
> > >
> > >
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