The 2023 Rotax® 850 E-TEC® Turbo R is a landmark engine in the snowmobile industry, featured primarily in Ski-Doo’s high-performance deep snow models. It represents a significant jump in power and refinement over previous iterations. Core Performance & Specs Horsepower: Delivers a factory-rated 180 hp, a 15-hp increase over the previous non-R turbo version. Altitude Performance: Uniquely maintains its full 180 hp up to 8,000 feet, compensating for thin air where naturally aspirated engines lose significant power. Engine Type: 849 cc liquid-cooled, two-stroke with eRAVE™ and electronic direct injection. Weight: The engine is housed in the REV Gen5 platform, which focused on weight reduction; for instance, a 154-inch Summit X with this engine has a dry weight of approximately 448 lbs.