The range of usable power is whats important. At some track, the range required is not that critical. For example, at IMI, we only need about 3 to 4,000 rpm range. We turn our Rotax no more than 12,500 and do not go below 8,000. In that range, the rotax is hard to beat. However, at a track like Bandimere, we are at 6,000 off the slow corners and yet we top out long before the end of the straight. Those motors that have a wider power band, can easily beat the snot out of the Rotax there.
At Grand Junction, its just about a draw. At the current weights and power band demands, its about a dead heat. No engine has a clear advantage that I can see. I’m not sure about The Track. At first glance, I thought it would be all Leopard, again due to power band requirements. Now I’m not so sure. It may turn out that up hill, advantage Rotax, down hill, advantage Leopard.