August 2013 Issue
Rotax 912 iS Efficiency: Better than Claimed
A year-long test by the company shows that the 912 iS delivers up to 30 percent better fuel economy than the 912 ULS. Its numbers rival diesel performance.
When Rotax surprised us last year with the rollout of its new 912 iS engine, we were skeptical of a claimed 20 percent improvement in fuel economy against the old standby 912 ULS. In a four-cylinder, high-RPM geared engine, that sounded like an overpromise. During our factory tour at Rotax, we politely told the engineers we would reserve judgment until the engine hits the field. Eighteen months later, it has and just as we suspected, Rotaxs initial claims were off the mark. But in the wrong direction, if the companys recent year-long test of the 912 iS is to be believed.
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