Lycoming O-145-B2 Specifications

TYPE
Four Cylinder, Direct Drive Horizontally Opposed, Air Cooled
Type Certificate No. 210
PERFORMANCE
Rated Horsepower 65
Rated R.P.M. 2550
Cruising R.P.M.:  
Economy 2200
Performance 2300
CYLINDERS
Bore 3-5/8 in.
Stroke 3-1/2 in.
Compression Ratio 6.5:1
Piston Displacement - Cubic inches 144.5
Head Temperature, Max. °F. 525°
Barrel Temperature, Max. °F 325°
FUEL & OIL
Fuel Octane 80
Oil Grade:  
Summer - Temp. above 40°F SAE-40
Winter - Temp. below 40°F SAE-30
Oil Sump Capacity - Quarts 4 to 5
Oil Sump - Safe Min. Qty - Quarts 2 1/2
Oil Pressure:  
Minimum Idling - (Lbs. Per Sq. In.) 15
Normal Operating - (Lbs. Per Sq. in.)
55 to 80
CRANKSHAFT
Crankshaft Rotation -
Anti-Propeller End:
Clockwise
VALVES
Valve Rocker Clearance (cold) 0.015
Valve Timing - Hot: Intake Opens 20° B.T.C.
  Intake Closes 65° A.B.C.
  Exhaust Opens 65° B.B.C.
Exhaust Closes 20° A.T.C.
IGNITION
Spark Occurs - Degrees B.T.C. 25° B.T.C.
Spark Plug Gap - Shielded .015 in.
Spark Plug Gap - Unshielded .025 in.
Firing Order 1-3-2-4
WEIGHTS & DIMENSIONS
Standard Engine Dry Weight 165.5 lbs.
Propeller Attaching Parts and Baffles 5.33 lbs.
Engine Total Weight 170.83 lbs.
Engine Height 20.59 in.
Engine Width 29.56 in.
Engine Length 24.62 in.
ACCESSORY DRIVE RATIOS Gear Ratio Direction of Rotation*
Magnetos 1.00 to 1 Clockwise
Fuel Pump .5 to 1 (Plunger Operated)
Tachometer .5 to 1 Counter Clockwise
* Viewed from rear of engine

See a  photograph of an engine.