AeroTwin™ Motors Corporation has developed and is manufacturing and distributing the new patented AeroTwin™ Engine designed by Bill White of New Zealand. It was designed to meet the needs of several markets for a light-weight, yet powerful, engine in the 50-65 horsepower range.

Unique Features of the AeroTwin™ Engine include (both Turbo and Natural Aspirated):
• Internal air cooling/oil scavenging system
• Reversible cylinder head (swap sides for inlet & exhaust)
• Hollowed head studs serve as oil passageways to cam boxes
• Can run both vertical and horizontal
• Engine Management System
• Engine is held together by 6 studs that pass through crankcase
and also hold down head
• All sealing surfaces use O-rings
• Internal starter drive uses ring gear as part of crankshaft counterweight
• Hollow cam shafts reduce weight
• Combustion chamber is ceramic coated
• Crankshaft secondary balance is improved by use of light alloys
• Bore/stroke relationship is structured to reduce secondary imbalance without the need for balancing shafts
• Output drive is available from both ends of engine

More than a great product, the AeroTwin™ Engine is backed by an experienced Engine Technical Support Team that is ready to assist with any product support needs or application questions you may have.

General Specifications for Turbo Charged Engine:
• 65 HP @ 4200 RPM
• Weight: 100 lbs
• Dimensions (Height): 17.5"
• Two Cylinders, In Line
• Dry Sump (Runs in Vertical and Horizontal position)
• Air Cooled 972cc 4 Stroke
• Firing Angle 360°
• Bore: 101.6
• Stroke: 60mm
• Compression Ratio: 8.0:1
• Manifold Pressure: 8 psi
• Two Sparkplugs per Cylinder
• Two Valves per Cylinder
• Belt Driven Twin Camshafts
• Electronic Fuel Injection and Ignition
• Fuel Octane Requirement: 91UL
• Oil Tank Weight: 8lbs
• Gear Reduction Box w/ Centrifugal Clutch: 27 lbs (see detail below)
• Propellar Flange: standard output flange has 75mm and 100mm bolt-circle pattern for mounting, an aircraft standard SAE No.2 propeller flange is also available as an option

General Specifications for Natrually Aspirated Engine:
• 50 HP @ 4900 RPM
• Weight: 90 lbs
• Dimensions (Height): 17.5"
• Two Cylinders, In Line
• Dry Sump (Runs in Vertical and Horizontal position)
• Air Cooled 972cc 4 Stroke
• Firing Angle 360°
• Bore: 101.6
• Stroke: 60mm
• Compression Ratio: 8.0:1
• Two Sparkplugs per Cylinder
• Two Valves per Cylinder
• Belt Driven Twin Camshafts
• Electronic Fuel Injection and Ignition
• Fuel Octane Requirement: 91UL
• Oil Tank Weight: 8lbs
• Gear Reduction Box w/ Centrifugal Clutch: 27 lbs (see detail below)
• Propellar Flange: standard output flange has 75mm and 100mm bolt-circle pattern for mounting, an aircraft standard SAE No.2 propeller flange is also available as an option

Detail Specifications (both Turbo and Natural Aspirated):
• Intake Valve dia ... 46mm / Exhaust ... 40mm
• Intake Port dia ... 38mm / Exhaust ... 34mm
• Intake Cam lift centre ... 102°
• Exhaust Cam lift centre ... 112°
• Total lift Inclusive ... 10mm
• Included Angle ... 32°
Feature Note: The cylinder head is designed to allow it to be rotated 180° so that intake and exhaust positions can be changed.

• Piston Type ... Shallow Slipper
• Piston Pin dia ... 22mm
• Connecting Rod Centres ... 120mm
• Connecting Rod Material ... Aluminum
• Connecting Rod Crankpin dia ... 50.8mm
• Crankshaft Main Bearing dia ... 58.42mm
• Crankshaft Number of Bearings ... 3

• Gear Reduction Box Ratios:
--22x47 = 2.136
------  23x46 = 2.000
------  24x45 = 1.875

------ Prop speed of 2000rpm
------ 2.136 = 4272rpm
------ 2.000 = 4000rpm
------ 1.875 = 3750rpm

------ Prop speed of 2200rpm
------ 2.136 = 4699rpm
------ 2.000 = 4400rpm
------ 1.875 = 4125rpm

------ Prop speed of 2500rpm
------ 2.136 = 5340rpm
------ 2.000 = 5000rpm
------ 1.875 = 4687rpm

Feature Note: The gear centres remain the same for all ratios, so it's just a gear pair to change from one ratio to another. All of the bearings have slip fit mounting clearances, as does the drive shaft, so the system requires no pressing or heating to change a gear pair. The casing is sealed with one perimeter O-ring, so there are no gasketing issues to contend with.