Jon2 - i have now fully broken in the RODY V12 qand tuned it in at the local track. This engine is without a doubt the most amazing mill i have ever seen. The power curve is mind blowing. It revs so high, that the cat is travelling at a higher speed in 1st gear, than my CV-R was in second gear. I would say it is well more than TWICE as fast as the CV-R. The powerband is consistant all the way through the throttle. it idles perfect, and to this date, after about 12 tanks of fuel, it hasnt stalled once - even during break in. runs very very cool - max temp recorded to date was 241, with avg temps hovering around 215 once tuned properly. I have been told that the power doesn't even start to realy show through until after the first gallon. i would recommend this engine to anyone who is an experienced RC driver, and has excellent tuning skills. i would not, however, recommend this engine for a beginner