backpressure? and exhaust fun

[Larry" <rocco16v@netzero.com (Larry)]

> > So I finally got plates on my car yesterday morning, which is a good
thing.
> > Not 12 hours later, I think the cat finally gave up the ghost and the
exhaust
> > failed right in front of the cat. Now, it revs freer, and is LOUD as all
hell. I
> > mean, I kinda like it, but the only problem is that my car exhibits some
> > backpressure. It did it before, when the exhaust was fully hooked up, it
> > was kinda quiet, but now its really making some good popping noises. My
> > question is this: how unhealthy is this popping noise which I assume is
> > backpressure, cause it only does it when I'm off the gas pedal, like
using
> > the engine to slow me down. Maybe I'm a sadist, but I like it... the car
> > seems to run a lot better without that pesky cat and muffler really
doing
> > much :) .
>
> It's not back pressure, it's the lack of back pressure.
>
> The popping noise is unburnt gas getting past the valves and later
> igniting.
>
> I understand valve damage can occur but I can't tell you exactly how
> long it will take to do harm.
>
> TBerk


TB is right about the source of the popping.  I'm not so sure it will damage
valves, since the ignition occurs well after the exhaust valve.  It might
blow out your exhaust system, but I don't think that is a big worry to
you....eh?

Larry

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