warfile - I think I have read that the Graupner motors have slightly different mounts and the motor plate must be drilled to fit - I may be wrong here but I think that's right. Also if I am not mistaken the "timing" of the Graupner motors needs to be reset for use in a car intead of aircraft - but once this is done they are very fast! You are in the right place to get the answers you need - just hang in there!