Technical data

Engine Type
Governor
Combustion Chamber
Bore & Stroke
Piston Displacement
Firing
Order
Direction of Rotation
20B TWO MARINE DIESEL ENGINE
GENERAL SPECIFICATIONS
Diesel, four-cycle, two-cylinder, fresh water-cooled.
Vertical, in-line, overhead valve mechanism
(18 hp at 3600 rpm maximum).
Mechanical, centrifugal weight type.
Swirl type.
2.99 x 2.76 inches (76 x 70 mm)
38.75 cubic inches (0.635 liters)
1 - 2
Clockwise, when viewed from the front.
Maximum Torque
(at 2200 rpm) 30 Ib-ft (4.15 kg-m)
Compression Ratio
Compression Pressure
Valve Timing
Valve Seat Angle
Valve Clearance
(engine cold)
Dimensions
Inclination
Weight
Fuel Consumption
(propeller allowing
rated rpm)
Idle Speed
Cruise rpm
23:1
398 psi (28 kg/cm
2
)
at 280 rpm
Intake Opens BTDC
Intake Closes ABDC
Exhaust Opens BBDC
Exhaust Closes ATDC
Intake & Exhaust 45°
Intake 0.010 inches (0.25 mm)
Exhaust 0.010 inches (0.25 mm)
Length: 25.87 inches (657.10 mm)
Width: 16.00 inches (406.40 mm)
Height: 19.75 inches (501.65 mm)
Continuous 15°
Temporary 25° (not to exceed 30 min.)
228 Ibs (103.4 kgs)
0.7 U.S. gph (2.65lph) running at 2500 rpm
(approximate).
1000 -1200 rpm
2500 - 3000 rpm
9 Westerbeke Engines