DIY_EFI Digest V4 #584

[Gary Derian]

I haven't seen it but I've heard about it.  It seems to me to be similar to
what Greg H described in having an expansion chamber to fool the exhaust
into thinking it has reached the end of the pipe.  Also the megaphones cause
pressure waves to be reflected back to the engine over a larger rpm range.
4 stroke motorcycles have used megaphones.  The design is not quite like a 2
stroke pipe, though.  I don't think a 2 stroke style will work on a 4
stroke.

Gary Derian <gderian at oh.verio.com>
> >
> > Has anyine seen any four strokes other then the Mercedes v-6 sedan car
using
> > an expansion chamber (s), like a 2 stroke.
> >   Any thoughts on why this might really be worthwhile, or just a
cosmetic
> > gimmick.  Would have thought other teams would be working with it by now
if
> > it made a hill of beans difference...
>
>
> it may allow for a more radical ex cam pattern without any torque loss
>
> Clive