Thanks for the info...I ran the heck out of the revo yesterday with the 1512 2df and even though I was under geared slightly, I was just amazed. It's on 4s right now and I am getting great temps all around and fantastic run times on 2 5000mah 7.4 lipos. This track had 6 or 7 guys running brushless buggies and truggies and I got even more valuable info. All I need now is a couple 62 and 65 tooth spurs for fine tuning and I can pack up the entire package and send it off to my son in england. Then I can get to building something for my self. Anybody in the market for some really high quality Nitro engines.