Algodoo

9000 nm @ 400 rpm, ~500 hp

Oh well, I can get similar power from a rotary of similar size/weight, such as this utter bundle of ridiculousness.

It's for the rallying competition isn't it? I thought vaidas369 would enter and beat us all epically but he hasn't..,

Well, keep in mind that your rotary engines are quite low in comparison with others! If you compare piston engines, you'll see that they are all not so different specs-wise. But if you get your weird cold-fusion, octaturbo rotary (xD) and compare it with a collision rotary you'd be utterly destroyed.
Now, piston engines aren't comparable with rotaries. Just don't try

And yeah, I thought Kilinich and vaidas would enter

Hey. My rotaries have their own unique disadvantages. Such as horrible vibration and the tendency to throw the vehicle they're installed in around everywhere. They also tend to be heavy as well. But they can be small and have good power (because you can stack 8 rotors on top of each other and leave two collidesets for the housing and ignition!)

I agree, rotary collide engines are quite op. But they're quite unrealistic too. In my rotary spawn engines the rotor gets pushed down by a ball, then comes back up, then gets pushed down again, sorta like a piston engine without a piston (oops, I just compared it to piston engine. Perish the thought ). But in a rotary collide engine you just have a ball that gets pushed around without having to have a "compression" stroke.