> I guess that the frequency should be half that. > 5000/60 = 83.33 rps / 2 (4stroke) = 41.67 Hz. > Or Am I wrong ? > >Ricardo Seixas > 41.67 Hz if your are injecting once per two crankshaft revolution (sequential injection), or 83.33 Hz if you are injecting once per crankshaft revolution (simultaneaous injection) like I do. Hugo.