Low revs is not the same as low stress. Many engines are limited by Brake Mean Effective Pressure (BMEP). BMEP is one measure of "stress" in the engine. For the same displacement engine, the higher the RPM where you get the power the lower the BMEP. https://en.wikipedia.org/wiki/Mean_effective_pressure
At those low-revs, the engine is loafing...and would last forever. Totally under-stressed.
You had to be on Paul Lamars email group to appreciate the development of this projects. Lots of nay sa
Had to be part of Paul Lamar,s email group to appreciate the development of this project. Lots of nay sayers,s in the beginning, but all seem to have gone silent!
Best power and torque rpm for ported engines, as well as valved, depends on port size and timing. It is quite possible to make a low rpm rotary, with smaller ports. Making ports smaller tends to be much harder than making them bigger, though...Aeromo,
You are so right about stress levels. something else to consider is efficiency. The rotary is a PORTED engine with all the openings opening very quickly and like other ported engines, (think 2 cycle), they need RPM to run in their best power range. EzyBuild, You could up the pressure and get one running at 3K but it would be likely to get terrible fuel consumption figures. (also remember I like rotary engines but I'd recommend against it.)
I calculated rod stresses on Briggs V twins, combustion forces are bigger than the inertial forces.Low revs is not the same as low stress. Many engines are limited by Brake Mean Effective Pressure (BMEP). BMEP is one measure of "stress" in the engine. For the same displacement engine, the higher the RPM where you get the power the lower the BMEP. Mean effective pressure - Wikipedia
While the wiki talks about the more common piston engine, BMEP is applicable to any positive displacement engine including Wankel and rotatory engines.