Yes it is true that the current 2 rotor RX7 engine is loud but you
don't need a muffler if you use a turbo.

Nobody on here has heard an RX8 engine with open side exhaust ports but
I would not be surprised if it were not a lot quieter than the current
RX7 engine with peripheral open exhaust.


Paul Lamar

Joseph Berki wrote:

I wonder how loud the RX 8 motor is with tuned headers and no muffler? If
it is quieter than the current RX7 motor why?  Is it the inconel splitters?
Can these be duplicated in the older motors?

Snip

The RX8 side exhaust port opens more gradually than the 13B peripheral exhaust port.
The rapid opening of the P-port cause supersonic shock waves to form.

Paul Lamar
 
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