OK, understand.
Mike
-----Original Message-----
From: Les Myer <LesMyer@geocities.com>
To: Mike Gigante <mikeg@vicnet.net.au>; spridgets@autox.team.net
<spridgets@autox.team.net>
Date: Tuesday, December 15, 1998 7:30 PM
Subject: Re: Mine scares me, it likes the speed
>At 02:02 PM 12/16/98 -0800, Mike Gigante wrote:
>>maybe there is a simpler explanation. The wind noise gets pretty loud,
>>louder than the exhaust and you auditory system effectively scales down
>>the RMS of the total sound. the exhaust then seems quieter.
>
>What I am saying, is that I observed a very noticeable quieting of the
>exhaust after installing an H-pipe on a dual exhaust system with headers,
>and wondered what increasing the pulse frequency in both pipes did to quiet
>the exhaust. I was speculating that this might be a reason for my 1275 to
>get quieter at high RPM. I can do this in third gear as well. Maybe it's
>a characteristic of my particular exhaust system, which is a long center
>branch header - and 2" pipe to a glass pack transversely mounted behind the
>fuel tank. It is huge diameter for the engine size. I also know the
>balance pipe is supposed to be a specific length and diameter in order to
>effectively quiet, but I have long lost the information about this. It is
>also supposed to add a couple of extra ponies. Just wondered if anyone had
>an explanation.
>
>Les
>
|