exhaust system idea

[Wayne Macdonald]

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Yamaha use a flap in the exhaust system of the YZF-R1, the flap is =
closed at low RPM to provide more back pressure  then opens as the revs =
increase.

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From: 	James Weiler
Sent: 	Sunday, March 14, 1999 4:19 PM
To: 	Greg Hermann
Cc: 	diy_efi at efi332.eng.ohio-state.edu
Subject: 	Re: exhaust system idea

OK legal issues, I didn't think about that part.....uhm, how about only =
a=20
parial bypass then.  What I mean is that the pipe with the butterfly=20
valve would protrude deep into the muffler such that most of the =
baffling=20
would be bypassed but not all of it.  Does this make sense?  Guess I =
need=20
to know what the noise limits are for my area and go from there.  Need=20
to add a decibal meter to my wish list.

thanks to all who replied,
later
jw


On Sat, 13 Mar 1999, Greg Hermann wrote:

> >On Sat, 13 Mar 1999, Greg Hermann wrote:
> >
> >> Nothing new under the sun is the name of this game--This sort of a =
set-up
> >> used to be called either a "cut-out" or "lake-pipes" (as in the dry =
lakes
> >> in the desert in California). Illegal in lots of jurisdictions, but =
prolly
> >> not a lot of cops any more who would have a clue what was going on =
OR that
> >> they are illegal!
> >>
> >Don't know about your area, but here the cops are all busy filling =
out
> >forms, sleeping in the photoradar van or guarding the Hefties, so if =
you
> >stay away from these areas you would be safe.
>=20
> Yeah--and with cutouts on a turbomobile, I doubt they would have a =
clue
> that they should look for cut-outs. Not quite as obvious as cut-outs =
on
> something like a medium riser 427 FE!!
>=20
> Greg
>=20
>=20
>=20


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