Quote Originally Posted by 2us70 View Post
I have never seen any of OMC's rotary motors run but I have seen one airplane and several race cars powered by Mazda's rotary engines. The one thing they all had in common was a very unpleasant exhaust sound when running with open exhaust systems. Did the OMC motors sound much like the racing Mazdas?
When we were developing the exhaust system for this engine we ran 4 open stacks on the dyno. It would peg the sound meter at 140 db. It also caused you belly to go in and out about 2 inches as we were in the dyno room at the time. With the exception of the 2 Parker engines, I hand adjusted each carb for every engine ran after that. That meant standing on the side of the dyno and turning the high speed jet. I'm about 40% deaf (my wife says 90%) now because of it.