High Quality Content by WIKIPEDIA articles! The Hirth 3701 is an in-line three cylinder, two stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft and small homebuilts. The 3701 was developed as a liquid-cooled and narrower installation alternative to the four cylinder Hirth F-30 air cooled engine of 85 to 110 hp (63 to 82 kW). The 3701 features triple Bing 34mm slide carburetors or optionally fuel injection. The cylinder walls are electrochemically coated with Nikasil. Standard starting is electric start and recoil start is not available as an option. The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1The engine runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil, or optionally 100:1 oil injection.

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