General Aviation Engines



Engine Photos and Information from EAA AirVenture



Engines from Wheels & Wings Fly-In
Osceola, Wisconsin, September 8, 2012
Photos by Tim Wheat

The McCulloch Model 4318 (Military designation: O-100) was originally used as a drone engine.
Two-stroke, 4-cylinder opposed, 72 HP @ 4,100 rpm (some versions 84 HP @ 4,100 rpm),
3.1875" (81 mm) bore, 3.125" (79.4 mm) stroke, 99.7 in³ (1,635 cc) displacement, weight approximately 78 lbs (35.4 kg)
Chrome-plated aluminum bore, pistons probably deflector type (as opposed to Schnurle loop-scavenged), single ignition

The Rotec R-2800 is an Australian design, manufactured for experimental use.
7 cylinders (as of 2012, 9 cylinder version, R-3600, based on the same cylinders, is also available), 110 HP @ 3,700 rpm
3.149" (80 mm) bore and stroke, 172 in³ (2,800 cc), weight approximately 225 lbs (102 kg) with accessories, 3:2 planetary gear reduction



Zane Cieslak's Homebuilt Three-Cylinder Radial

Designed and built in 1933 to replace a Ford Model T in his homebuilt "Little Pal", this engine is now displayed in the EAA Florida Air Museum in Lakeland, Florida. The engine is built of a crankcase from a 1917 LeRhone rotary, cylinders from a 1928 Anzani radial engine, a vast assortment of vintage automobile parts, and special parts machined and fabricated for this one-of-a-kind engine. It is displayed with the original 75-inch diameter Flottorp propeller. The engine was donated to the museum in 1995 by Zane's son Bob Cieslak.

The engine develops 70 hp at 1,700 rpm, and was previously installed on "Little Pal 2", a two place version of the original airplane that Zane and Bob, were building at the time of Zane's death. Many hours were spent by the two of them taxiing the fuselage around with this engine.



Rotax 912ULS
Photos by Tim Wheat
Crankshaft photos provided by Rotax, courtesy of Dean Vogel, Rotax Training, Lockwood Aviation, Sebring, FL

While this is a current-production engine, it is historic in the sense that it represents a significant shift in aircraft engine design. "…an aircraft engine designed by motorcycle engine engineers…" Its continuing popularity is a testament to its light weight, fuel economy and durability.

General specifications and features (reference sheet issue 1998-07-14 AC/FJ)
  •  95 hp @ 5,500 crankshaft rpm, 100 hp @ 5,800 crankshaft rpm
  •  (80 hp and turbocharged 115 hp FAR 33 versions are available)
  •  Unleaded gasoline, 91 octane
  •  82.6 in³ (1.352 L), 3.31" bore x 2.40" stroke
  •  Pressed-together plain bearing crankshaft
  •  Liquid-cooled heads with gear-driven water pump
  •  Air-cooled cylinders with Gilnisil® nickel-silicon plating on aluminum bore with same expansion coefficient as pistons
  •  Dry-sump lubrication with crankcase oil scavanged back to tank using engine blow-by pressure
  •  Dual electronic self-energized ignition systems with electronic advance
  •  Dual altitude-compensating constant-velocity carburetors with start enrichment circuit
  •  Integrated 2.43:1 ratio reduction gear with cam type damper and optional overload clutch
  •  Integrated 250 W alternator