Chris,
I hope you managed to stay out of the sand most of the time at the Bridge
:->
Delightful place. Musta been fun.
The state of the art now ( sorry Art) is that new performance bikes and
snowmobiles are ALL pretty quiet and the aftemarket has a really tough time
making any more power at all with better mufflers.
They can make them lighter and shorter lived, but no more HP
I do know that stock 160 HP 2-stroke snowmobles like the latest F1000 AC
have lighter mufflers than super bikes. About 1/2 the weight- roughly 15# vs
30#. The noise standards are different, so this may not be completely fair.
As I've mentioned before, a CVT machine has more potential for equivalent
quieting with low exhaust weight than a motor with the same HP that has to
be quiet over a wide RPM range.
The quietest high performance combo might be:
CVT AND a 2 OR 4-stroke with a turbo and a big muffler.
There have been 2-stroke waterbikes around for many years running both
superchargers and turbos on the same motor.
Chuck
From: Chris Reinhardt <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: RE: [F500] Quieter Engines (maybe)
Date: Sun, 3 Dec 2006 11:16:38 -0800 (PST)
OK let me date myself... Back in old days, pre-1997 at Bridgehampton whe
did sound level checks on the race bikes, it was 1/2 redline, 18" from the
muffler tip, @ 45 degree angle. If I can remember back that far the limit
was like 97db. We ran race cans and sometimes a hollowed out WD40 can hose
clamped to the tail pipe... If you spotted a sound cop, you rolled out of
the throttle, and then stabbed it again!!! I had a CR500 in a Hawk
chassis, and I was told it was the loudest thing out there!!!
CR
Chuck Voboril <[EMAIL PROTECTED]> wrote:
BTW, I got a complete 1300cc Hayabusa motorcycle exhaust system
including
Tri-Y header, intermediate pipes and mufflers to study.
It is suposed to meet the 80 dB motorcycle noise limit, but that 80 dB is
hard to compare to ANYTHING else because the standard says it is measured
in NEUTRAL with the motor at barely cracked open throttle holding the motor
to a specified low RPM.
The mikes are supposed to be aimed 45 degrees to the axis of the bike
(aimed
from front towards the back on the side) and located very very close to the
bike.
Chuck
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