Onan P218G Engine Specs
The Onan P218G (Performer 18) is a 47.7 cu-in (782 cc) two-cylinder air-cooled four-stroke internal combustion small gasoline engine with a horizontal shaft made by Onan for general-purpose applications.
The Onan P218G engine has a carburettor fuel system, an electronic battery ignition system, an L-head design with two flat cylinders, an aluminium cylinder block, and an electric starter.
The Onan P218G engine delivered 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm horsepower. The Onan P218G engine cylinder bore is 82.55 mm (3.25 in), and the piston stroke is 73.01 mm (2.87 in). The Onan P218G engine compression ratio rating is 7.0:1.
The breakdown of the Onan P218G engine code is as follows:
- P – Engine Family
- 2 – Two cylinder
- 18 – 18.0 BHP power
- G – Gasoline
Onan P218G (18.0 HP, 13.4 kW) Two Cylinders Engine Specs
Engine Specifications
| Model | Onan P218G (Performer 18) |
| Type | 4-stroke, L-head, flat |
| Displacement | 782 cm3 (47.7 cu-in) |
| Max. horsepower | 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm |
| Max. torque | – |
| Fuel system | Carburettor with the fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Electronic battery ignition system ignition system |
| Lubricating system | Forced lubrication |
| Starting system | Electric starter |
| PTO shaft rotation | Clockwise (viewed from the flywheel) |
Cylinder Head
| Valve Arrangement: | L-haed, gear driven | |
| Valves: | 4 (2 per cylinder) | |
| Stem outer diameter (standard): | INTAKE | 7.099-7.112 mm (0.2795-0.2800 in) |
| EXHAUST | 7.061-7.074 mm (0.2780-0.2785 in) | |
| Valve spring free length: | 40.640 mm (1.6 in) | |
| Lobe height: | INTAKE | 28.880 mm (1.1370 in) |
| EXHAUST | 29.390 mm (1.1571 in) | |
Cylinder block
| Compression ratio: | 7.0:1 | |
| Bore x Stroke | 82.55 X 73.00 mm (3.25 x 2.87 in) | |
| Sleeve internal diameter | 82.530-82.550 mm (3.2492-3.25 in) | |
| Piston skirt’s outer diameter | 82.420-82.440 mm (3.2449-3.2457 in) | |
| Ring end gap | Top/Second | 0.076-0.203 mm (0.003-0.008 in) |
| Connecting rod small end ID | 17.470-17.480 mm (0.6878-0.6882 in) | |
| Piston pin outer diameter | 17.463-17.468 mm (0.6875-0.6877 in) | |
| Crankpin diameter | 41.280-41.300 mm (1.6252-1.626 in) | |
| Crankshaft main journal diameter | 50.780-50.800 mm (1.9992-2 in) | |
Service Information
| Engine | |
| Maximum speed | 3,600 |
| Cylinder compression | 517-793 kPa (75 to 115 psi) |
| Valve clearance | |
| Intake valve clearance | 0.130 mm (0.0051 in) |
| Exhaust valve clearance | 0.330 mm (0.0130 in) |
| Oil system | |
| Oil type: | API SF, SF/CC, or SF/CD |
| Recommended oil: | SAE 5W-30, 10W-30, 30W, 40W |
| Oil Capacity | Without oil filter: Standard base: 1.4 L (1.5 US. qt, 1.2 Imp. qt.) High capacity base: 2.6 L (2.75 US. qt, 2.3 Imp. qt.) Oil filter: 0.3 L (0.32 US. qt, 0.26 Imp. qt.) |
| Ignition system | |
| Ignition timing | 20° B.T.D.C. |
| Spark plug | NGK BPR5EFS, Champion RS14YC |
| Spark plug gap | 0.640 mm (0.0252 in) |
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Final Words
This concludes our discussion of the Onan P218G (18.0 HP, 13.4 kW) Two Cylinders Engine specs and review; however, if you have any questions regarding this article, please submit them in the comment section below. We will do our best to respond to you as soon as possible.