Hi, I have the following formula: brake power = 2(pi)NT I also have the following figures: RPM (instant) = 3550rpm and N° of cycles over 30secs = 880. The engine is four stroke-one cylinder. Just wondering how do I covert the number of cycles to RPM? I have divided by 0.5 because it was for half a minute (30secs) but it seems I have to divide by 0.5 again is that because it is a four-stroke cycle? And in the brake power forumla what is the units of N if T is in Nm. CHEERS!