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RE: Backfire



> I think that the reason that people believe that it's an exhaust leak
> that causes backfires is that that is where they see or hear the
> backfire happening.  The fact is that it must be the case that it is
> engine tuning that is the cause of any backfire.  Incorrect valve lash,
> incorrect point gap, incorrect plug gap, incorrect timing, imporperly
> jetted carbs, manifold leaks can all contribute to backfires (or any
> combination thereof.)  It also stands to reason that it is real easy to
> swap in a new exhaust system versus trying to tune ones car.  When one
> calls any of the advertisers in the various VW magazines, they
> undoubtedly say it's an exhaust leak which causes backfires and they
> have an exhaust system that MIGHT cure it.  Check out the true cause(s)
> of your engine ails and don't just start swapping parts.  
> 
> I think that part of this "Hobby" of ours is to become enlightended
> about the workings and engineering of our cars.  They are designed a
> certain way to be operated a certain way.  Ours is to understand what
> that "WAY" is not just swap parts for the sake of being "cool".

Wow, wish I'd said this!!

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