Onan Performer Series - Engine Specifications

Model
l
P21Q
P218
P220 P224
Power at Rated Speed
(3600 RPM)
16 HP
(11.9 kW)
18 HP
(13.4 kW)
20 HP
(14.9 kW)
24 HP
(17.9 kW)
Bore
3.250 inch
(83 mm)
3.250 inch
(83 mm)
3.250 inch
(83 mm)
3.563 inch
(90 mm)
Stroke
2.625 inch
(67 mm)
2.875 inch
(73 mm)
2.875 inch
(73 mm)
3.000 inch
(76 mm)
Displacement
44 inch 3
(714 cc)
48 inch 3
(782 cc)
48 inch 3
(782 cc)
60 inch 3
(980 cc)
Compression Ratio
6.5 : 1
7.0 : 1
7.0 : 1 7.0 : 1
Engine Type
Horizontally Opposed 2-Cylinder, 4-Stroke Cycle, Spark-Ignited,
Side-Valve, Air-Cooled, Horizontal-Shaft
Oil Capacity—Low Profile
Base*
1.8 quart (1.7 1)
Oil Capacity—Medium Capacity
Base*
2.5 quart (2.4 1)
Oil Capacity—High Capacity
Base*
3.0 quart (2.8 1)
intake Valve Clearance (Coid)
0.005 inch (0.13 mm)
Exhaust Valve Clearance (Cold)
0.013 inch (0.33 mm)
Spark Plug Gap
0.025 inch (0.64 mm)
Spark Plug Tightening Torque
11 Ibs-ft (14 N-m)
Ignition Timing
20° BTDC (Non-adjustable electronic ignition)
* - With filter. See Periodic Maintenance for oil filling instructions.
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