2si 215
title: "2si 215" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["air-cooled-aircraft-piston-engines", "two-stroke-aircraft-piston-engines"] topic_path: "general/air-cooled-aircraft-piston-engines" source: "https://en.wikipedia.org/wiki/2si_215" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::data[format=table title="infobox aero engine"]
| Field | Value |
|---|---|
| name | 2si 215 |
| engine_type | Two-stroke aircraft engine |
| manufacturer | 2si |
| national_origin | United States |
| :: |
| name=2si 215 | image= | caption= |engine_type= Two-stroke aircraft engine |manufacturer=2si |national_origin=United States |first_run= |major applications= |produced= |number_built= |program cost= |developed_from= |variants_with_their_own_articles=
The 2si 215 is a family of single-cylinder, fan-cooled, two-stroke, single ignition, aircraft engines that were designed for ultralight aircraft.
The basic engine was originally designed and produced by JLO-Motorenwerke of Germany and was later acquired by the AMW Cuyuna Engine Company of Beaufort, South Carolina and marketed under the Cuyuna brand name. Later the engine was marketed by Cuyuna under the Two Stroke International (2si) brand. Cuyuna no longer markets engines for aircraft use although the 215 is still in production as an industrial and multi-fuel engine.
Development
The 215 is a conventional single-cylinder engine that weighs 39 lb in its 215R aircraft version. The engine features single breaker and points ignition, with single capacitor discharge ignition used on the current models. It also incorporates piston porting, tuned exhaust system, single carburetor, fan cooling, fuel pump, a cast iron cylinder liner, ball, needle and roller bearings throughout. The 215R aircraft version was offered with an optional belt reduction system and the modern industrial versions have an optional gearbox with ratios of 2.04, 2.65 and 3.06. Starting is a recoil starter with a custom electric starter available as an option.
Variants
;215D :Gasoline aircraft engine with direct drive. Single carburetor, 20 hp at 6000 rpm, weight 42 lb, out of production. ;215F :Gasoline industrial engine. Single carburetor, 20 hp at 6000 rpm, still in production. ;215MF :Multi-fuel industrial engine. Single carburetor, 7 to at 6500 rpm, weight 53 lb, still in production. ;215R :Gasoline aircraft engine with belt reduction drive. single carburetor, 20 hp at 6000 rpm, weight 39 lb, out of production.
Applications
- Advanced Aviation Husky
- Birdman Atlas 215 XC
- Birdman Atlas 215 3-A
- Carlson Sparrow
- Eipper Quicksilver
- Paup P-Craft
- Robertson B1-RD
- Rutan Solitaire
- Striplin Silver Cloud
- Wood Sky Pup
Specifications (215D aircraft engine)
and start a new, fully-formatted line with -- |ref=Cuyuna & 2si |type=Single-cylinder, two-stroke aircraft engine |bore=2.658 in |stroke=2.362 in |displacement=214 cc (13.06 cu in) |length=11.75 in |diameter= |width=7.0 in |height=14.0 in |weight=42 lb |valvetrain=piston porting |supercharger= |turbocharger= |fuelsystem= |fueltype=Regular auto fuel |oilsystem=premixed oil and fuel at 50:1 |coolingsystem=fan cooled |power=20 hp at 6000 rpm |specpower= |compression=12.5:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=
|designer= |reduction_gear=optional belt reduction
|general_other= |components_other= |performance_other=
References
References
- Cuyuna Development Company: ''Cuyuna Engines'', Cuyuna Development Company, undated
- Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-2 Cybair Limited Publishing, 2001. {{ISBN. 0-9680628-1-4
- (n.d.). "2si Company Profile".
- (n.d.). "Engine Model 215F Industrial Configuration".
- (n.d.). "Diesel / Multi-fuel Engine Model 215 MF Industrial Configurations".
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