[OT] Boom boom sound

[Peter D. Hipson]

Run rich, (idle mixture) and low back pressure exhaust system, and you 
should get some good popping! I get it all the time on my Isuzu plow truck, 
under those exact conditions, and have done it with other engines, too.

At 05:54 PM 1/2/2001 +0000, you wrote:
>On 2 Jan 2001, at 13:14, Jeroen Proveniers wrote:
>
> > Hai,
> >
> > 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.
>
>Ade
>
>ICQ. 75653589
>www.adesite.co.uk
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