The idea that 4-stroke is always quieter than 2-stroke is not correct.
There is a 2-stroke 600cc racing sled class that has a 85 dBm limit and Aaen
says it is not problem to meet that requrement.
The current crop of the highest HP big bore 4-stroke bike motors have 25-35
pound mufflers to meet highway noise requirements. The current biggest
bore 2-stroke sled motors meet almost the same as highway noise standards
with comparable weight mufflers.
Lighter mufflers may be as effective if one gives up service life
The CVT which allows almost constant RPM under full throttle on a 2-stroke (
or a 4-stroke for that matter) should theorectically permit more noise
cancellation with less weight over the more narrow range required.
I used to do design work for a company that did both active and passive
noise cancellation, so I have some knowledge in this area.
Chuck
From: "fmod" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: <[email protected]>
Subject: Re: [F500] engines
Date: Mon, 7 Aug 2006 09:15:27 -0400
Jay that would be ok, but most of us in the real areas (New England) that
are currently having the biggest noise problems still would like to see a
4stroke sled engine with CVT. Also, I thought it was mentioned that
someone, maybe Aeen was working on a solution to keeping the noise down
without having to ad a big car muffler to our cars. A small Dynamax seems
to work on the newer 493 engine much better than the combination of my
Flowmaster and Aeen singer on my 494! I don't know if Aeen has seen
pictures of my setup, but it sure is fugly!
----- Original Message ----- From: "Jay Novak" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, August 05, 2006 8:43 AM
Subject: [F500] engines
I am starting this thread to simply start a dialog on the subject of
alternative drive trains, so do not send the assassins.
I am of the opinion that we need a 4 stroke engine with a conventional
transmission for our class to survive. I would be happy with a 2 stroke
with a transmission but I do not think there is a production engine
available.
I am not saying that we eliminate the 500cc w/CVT combination, but only
that
we have a competitive alternative engine that has a conventional 6 speed
transmission.
I say this because we need to generate lots of new interest in F500 or we
have a good chance of losing our national status in a few years.
Thanks ... Jay Novak
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