Zanzottera MZ 201
The Zanzottera MZ 201 and MZ 202 are a family of twin-cylinder, in-line two-stroke, dual ignition aircraft engines designed for ultralight aircraft and motor gliders. The engine was originally designed and produced by Zanzottera Technologies of Italy, but the design was sold, along with the rest of the company's two-stroke ultralight aircraft engine line, to Compact Radial Engines of Surrey, British Columbia, Canada.
The MZ 202 was developed first as a 60 hp (45 kW) lightweight competitor to the liquid-cooled 64 hp (48 kW) Rotax 582. Later the MZ 201 was developed from the MZ 202 as a de-rated 45 hp (34 kW) version intended for motorgliders and single place ultralights that needed more power than the single-cylinder MZ 34.
The MZ 201 and 202 both have a cylinder barrels that are Nikasil-coated. The bore and stroke are the same as the single-cylinder MZ 34 engine. The MZ 201 features an optional recoil starter or electric starting, while the MZ 202 has electric starting only. The MZ 201 has a choice of a reduction drive belt or gearbox, while the MZ 202 offers just the gearbox with reduction ratios of 2.18, 2.55, 2.88, 3.11 or 3.66 to 1.
The unit cost for the MZ 201 in 2009 was US$4440, and the MZ 202 US$5560.
The owners manual acknowledges the limitations inherent in the design of the engine, stating:
Type: Twin-cylinder, two-stroke aircraft engine
Bore: 76 mm (2.99 in)
Stroke: 69 mm (2.72 in)
Displacement: 626 cc (38.20 cu in)
Length: 313.5 mm (12.34 in)
Width: 299.4 mm (11.79 in)
Height: 331.1 mm (13.04 in)
Dry weight: 38 kg (84 lb) with starter motor, two carburettors, fuel pump, cooling system and exhaust system.
Valvetrain: Reed valve induction
Fuel type: Premium auto fuel
Oil system: 50:1 oil to fuel, premixed
Cooling system: air-cooled
Reduction gear: RZ 2 gearbox with reduction ratios of 2.18, 2.55, 2.88, 3.11 or 3.66 to 1
Power output: 63 hp (47 kW) at 6250 rpm
Compression ratio: 9.1:1
Price 1998: 17530 Fttc