antique saw motor possibilites
Okay Rif, here are a few picts of supertwinn motor I refered to in an earlier post in this thread. Here are some specs for this engine:
Model: PD "SUPER TWIN"
MANUFACTURED BY:IEL (Industrial Engineering Ltd.)
VANCOUVER, BRITISH COLUMBIA, CANADA
YEAR INTRODUCED: 1951
YEAR DISCONTINUED: 1952
ENGINE DISPLACEMENT: 9.82 cu. in. (161cc)
NUMBER OF CYLINDERS: 2
CYLINDER BORE: 2.0 in. (50.8 mm)
PISTON STROKE: 1.5625 in. (40 mm)
CYLINDER TYPE: Aluminum with cast iron sleeve
INTAKE METHOD: Rotary valve integral with crankshaft
WEIGHT :45 lbs. (20.4kg) powerhead only
CLUTCH: Centrifugal 3 shoe with bonded lining
DRIVE TYPE: Bevel gear transmission 3.2-1 gear ratio
MAGNETO TYPE: Wico
CARBURETOR: Tillotson MD-55A float type
AIR FILTER SYSTEM: Brass wire screen
STARTER TYPE: IEL automatic rewind with steel cable
OIL PUMP: Eccentric driven piston pump in transmission with manual assist
IGNITION TIMING: 27 degrees B.T.D.C.
BREAKER POINT SETTING: .020 in.
FLYWHEEL/COIL AIR GAP: fixed, not adjustable
SPARK PLUG TYPE: Champion J8J
SPARK PLUG GAP: .025 in.
CRANKSHAFT MAIN BEARINGS: Ball and roller types
FUEL OIL RATIO: 10-1
RECOMMENDED FUEL OCTANE: Regular
This is probably more info than you wanted to know.
Another saw I have that might adapt fairly easily is a David Bradley gear drive. This saw was made so that the bar could be optionalyy mounted on the outside of the gear housing when the saw was used for stump cutting. This feature would possibly make this saw easier to adapt to bike propulsion. It is powered by a 77cc power product engine. O have others sawws with this same engine, which was used by many makers during the 1950s and into the sixties.