[OT] Boom boom sound

[Andy Laurence]

> > Some cars have that typical boom boom sound in the exhaust when the
> > throttle is released (Alfa Romeo 33 for example); I really like this
> > sound. I do not know the cause of it, but I want my car to have it. Is
> > there anything I could make? It's a Ford Sierra with injected 2 litre
> > engine, completely orginal.
>
>I have only ever had it from an excessive dia exhaust. 2" ID on a
>55bhp 1000cc A series for instance. It may be a nice noise but
>excessive dia of the exhaust means you loose gas speed (and
>thus gas momentum) which reduces scavenging at the end of the
>exhaust stroke.

I can say I had precisely the same experience at the age of 17 going mad 
with exhausts on a 39bhp Mini ;-)

Andy

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