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The Rotax will rev a bit more, it is rev limited to 13,500 by the ignition but you can get a bit more out of them if you do a good job of jetting and gearing. However, the power drops off the table after 12,500. That has to do with port timing and such. The reason the Rotax is limited is to increase motor life. The Rotax is rated for 50 hours where if you rev the other 2 cycles to the 16+ range they are capable of, you won’t see half that life.
On tracks where there is a longish straight and a very slow corner, the limited rpm range of the Rotax is at a clear disadvantage to the other engines. On a track like IMI where ther are no slow corners, the Rotax has an advantage as we can keep it in the sweet spot. If Brad were to take the hair pin and flaten it and a couple of others (they are all banked now) or even make one off camber, it would completely take away the Rotax advantage there.
The top 4 in TaG Senior this past weekend and the top 2 in masters were all Rotax.
That totally makes sense. I wondered why the Rotaxes kicked so much butt this weekend. Im curious why anyone doesnt make a motor with say a 58mm bore, and a 50mm stroke. Thing would rev like mad and have tons of torque.
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