Rotax 915iS Announced

Rotax 915iSRotax just caused a stir in the AirVenture media center with the announcement of the turbocharged 915is. Essentially a turbo version of the popular 912iS, the new 915iS should be available in the second half of 2017.

Rotax says take off power is available to 15,000 ft, and that's 135 hp at 5800 rpm using 98 RON gasoline (95 RON is the minimum required; 100LL is acceptable). Torque is also increased, as Rotax said a new PSRU gearbox is used, but a torque rating was not immediately announced.

[sc:ad180]The 2000 hour TBO and dual-redundant electronic fuel injection from the 912iS are retained. The latter now also controls the wastegate, so boost control is automatic and requires no pilot input. The core engine is also mainly 912iS, but at least the crankshaft and new forged pistons are upgraded. The crankcase and cylinders were confirmed as 912iS carryovers.

Rotax reports over 2000 dyno hours have been logged to date; a helicopter version may be coming eventually as well, as Rotax has received requests for such an engine.

Check out this video by Paul Bertorelli from our suster publication AVweb:



Tom Wilson

Tom Wilson is a professional magazine writer and nurtures an ongoing affair with all things internal combustion. His writing is most often found in automotive magazines, but aviation is his first love. Working as a line boy, he learned to fly while in high school, but still hasn't mastered the art of keeping a paper chart in an open cockpit.

3 Replies to “Rotax 915iS Announced”

  1. Fuel burn is the all critical data that is omitted from this announcement. There are many ways to get up to 135 HP, how does this compare and what does the engine weigh.

  2. With the success of at least 2 big bore kits I would have thought they would have gone the same route plus the turbo. There is only so much reliable power available from 80 cubic inches. I assume the full turbo power is only good for 5 minutes as there is no wastegate?

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