I posted this on rx7club but I wanna discuss it here too. I was watching Dave's Auto Center on YouTube (great YouTube channel) and I've rewatched this video multiple times about these pistons. They've redesigned pistons and changed the game it seems for piston motors, with dimpling. These dimples on the crown of the piston act as little pockets for turbulent air, and reduce the "boundary layer" of air on the crown of the piston. I can't explain it very well but this new development allows for a more efficient combustion process, increasing power, torque, reducing carbon buildup, lowering EGT's, AND increasing fuel economy. There's a great video about this that I'll link, it's a very interesting watch.

This got me thinking though. If this technology can be applied to pistons, a combustion engine, maybe it's possible for rotary engines as well? They're both combustion engines and although the rotary's quite different, but maybe this dimpling could be applied to rotors. If it could, the gains would be amazing across the board, and the less carbon buildup would be a nice bonus to aid reliability. I'd like to see what y'all think. I also have sent them an email asking about the use of dimpling in rotaries and am awaiting a response.

Here's the video:

You Tube