Unlike regular engines that have cams that ramp up the closing of the
valves, rotaries have ports and the rotor opens and closes on the ports
without the ramp and hence the loudness of the motor. Kinda like a door
being slammed shut.
Rotaries as Tom mentioned have very high exhaust temperatures and custom
headers and a very heavy exhaust would be required as well as a muffler that
can withstand the temperatures.
The crank center is also very high as compared to regular piston motors and
the motor would have to be set lower in the frame to get the correct
driveshaft angles.
Great engine when port work is done but stock they're basically dogs except
for the Turbos. Horrible gas mileage also.
Mike
----- Original Message -----
From: "Thomas - Sweden" <csp311@telia.com>
To: "Jimmy Claypool" <srl311vg@hotmail.com>
Cc: <marcs@misresourcegroup.com>; <datsun-roadsters@autox.team.net>
Sent: Monday, May 20, 2002 2:01 PM
Subject: Re: engine swaps
> Rotary engines run hot. You would need a muffler
> filled with lava rocks to withstand the heat if you
> go racing. The non-turbo's are really loud. I think
> an old IMSA racing RX-7 tested 125 dB in an
> Road & Track magazine.
>
> Thomas
>
> Jimmy Claypool wrote:
>
> > The big issue with a rotary and especially a turbo rotary is the
exhaust. It
> > exits the passenger side and can reach in excess of 1500 degrees maybe
more
> > with a turbo. Otherwise I would be all for it. Compact design and easy
ways
> > to make big power. I have seen NA motors put out 250hp easy.
> > If you find a way to keep from melting your passenger feet to the floor
let
> > me know. I am considering building an E mod autocrosser and would use a
> > turbo rotary but theres no passenger seat in the plans so no worries
there.
> > there might be a way to make a sheild to go between the body and the
> > exhaust??? Just a thought
> >
> > Jimmy
> >
> > >From: "Marc S" <marcs@misresourcegroup.com>
> > >Reply-To: "Marc S" <marcs@misresourcegroup.com>
> > >To: "ROADSTER" <datsun-roadsters@autox.team.net>
> > >Subject: engine swaps
> > >Date: Mon, 20 May 2002 10:46:55 -0500
> > >
> > >Would any of the turbo rotary engines work
> > >
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> >
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