Re: Backfire

[mekennedy@stkate.edu]

I don't know enough to be commenting personally, but I happened to show
this to a friend of mine (mechanic of 10 years) and this is his 2 cents...

:: By the way...

  Cars DO backfire from exhaust leaks, anyone who can tune an engine
well enough to burn every last bit of fuel before it enters the exhaust
should be applying for the position of GOD!!  they would probably get it
LOL    On a car, its absolutely NOT realistic to expect that clean and
efficient of a burn. Thats teh reason that cars have thigns like air
injection systems, catalytic converters etc...  The EPA wants them
clean, but even they understand it cant all be done in teh engine, some
of its is finished in teh exhaust and lots of it is NEVER finished.
There is most likely a leak if its backfiring in teh exhaust, but a
really poorly running engine can also do it.. The exhaust is definately
MOST likely :)

::

"Jim Adney" <jadney@vwtype3.org> on 07/18/98 12:14:14 AM

To:   type3@vwtype3.org
cc:    (bcc: Meghan E Kennedy/St. Catherine)
Subject:  Re: Backfire




On 17 Jul 98 at 18:22, type3@vwtype3.org wrote:

> I'm trying to stop my 70 FB from backfiring. I replaced the gasket
that
goes
> from the
> damper pipe to the muffler and it still backfires. I'm going to crawl
under it
> tomorow and find the leak but where else can I check?

Popular opinion to the contrary, I don't believe backfires have
anything to do with exhaust system leaks.  If your engine is running
correctly there should be very little unburned gasoline expelled
from the engine into the exhaust system, let alone enough to burn or
explode.  If there is, you have a problem in your engine; look
there.

You can get excess gasoling accumulating in the exhaust system if the
engine is running WAY too rich, or lean enough that the mixture
doesn't burn in the combustion chamber.  Or from bad timing or valve
leaks.

Jim
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Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
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