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View Full Version : need Quiet like a golf cart for Airboat app



scottperkinsusa
11-05-2007, 11:18 AM
I am using a hi compression two cylinder 700 cc motorcycle engine
reving to 6000 rpms
on an airboat and I need to make it extremely quiet without creating
excess back pressure and robbing power. I understand how the diffuser
plates work but I hope not to use them much and instead maybe consider
using two or three Supertrapp muffleres connected in series to
reduce the noise as much as possible. I think because of the hi
compression of this engine it is extraordinarily loud ... way louder
than most car engines I've heard with straight pipes.

I'd like to hear from the experts as I believe most Supertrapp products
are for the performance crowd that usually want a loud, gnarly and
throaty sound to impress people. I am getting special permission
to operate on a lake that normally prohibits motorized traffic it
I can make it super quiet like todays dealer automobiles.

I have already designed a super large and slow turning propeller
to eliminate that source of noise.
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bschultz
11-05-2007, 01:09 PM
I am using a hi compression two cylinder 700 cc motorcycle engine
reving to 6000 rpms
on an airboat and I need to make it extremely quiet without creating
excess back pressure and robbing power. I understand how the diffuser
plates work but I hope not to use them much and instead maybe consider
using two or three Supertrapp muffleres connected in series to
reduce the noise as much as possible. I think because of the hi
compression of this engine it is extraordinarily loud ... way louder
than most car engines I've heard with straight pipes.

I'd like to hear from the experts as I believe most Supertrapp products
are for the performance crowd that usually want a loud, gnarly and
throaty sound to impress people. I am getting special permission
to operate on a lake that normally prohibits motorized traffic it
I can make it super quiet like todays dealer automobiles.

I have already designed a super large and slow turning propeller
to eliminate that source of noise.

All of our Universal Mufflers are "end of the pipe" applications. We do not have mufflers that are capable of hooking together in "series". I would suggest going to the OEM muffler, which is most likely the quietest you will achieve.