Siemens 5 / Sh 13
The Sh 13 is low pressure due to the engine being completely ball bearings. Cylinders are all of steel barrel with aluminium alloy ribs being cast on by special process, with aluminium alloy heads held down by six studs and are removable.
Intake ports are at the rear and exhaust ports on the side. The crankshaft assembly is composed of two major castings and front and rear cover plates all of aluminium alloy.
The crankshaft is a two piee single throw and all connecting rods are tubular. The master rod is on two ball bearings. The aluminium alloy pistons have two compression ringa and two oil rings in each. Both the exhaust and intake valves are tulip shaped.
Type: 5 cylinder air cooled radial
Approved Dept of Commerce
Military Rating: 83 hp at 1710 rpm
Commercial Rating: 83 hp at 1710 rpm
Displacement: 317 cu.in
Compression ratio: 5.3
Bore: 4.133 in
Stroke: 4.724 in
Length: 33.8 in
Diameter: 39.25 in
Weight: 247 lb
Fuel consumption: not more than .52 lb/hp/hr
Oil consumption: not more than .027 lb/hp/hr
Lubrication: Dry sump, force feed, low pressure
Ignition: 2 Siemens or Scintilla magnetos
Carburation: 1 Sum Carburetor
Spark plugs: 2 per cylinder Siemens