Dave,

The Syssa 180 is a decent racing engine. Loves to rev. I tried detuning it to turn reasonable loads at decent rpm but it just wasn't optimal.

My current choice for the past roughly 5 years is the GT33. Turns the same props as the 185 at the same or better rpm. Best of all is the mid range torque which rivals the YS. And on the light Griffin, I use 1/3 throttle to 1/2 for verticals. 8 ozs lasts 15 minutes, no fib.

There are a few guys in France flying the RCGF32 and report good results with that one. I've not tried it so can't say definitively. It's only 250$ or so. And Ron Mc is running an EME35. There are several inexpensive choices. These are simple sport engines no different than the OS160FX, except they are on steroids and perfect for pattern