The General Motors GM8.1L-HO is a 8.1 L 8-cylinder turbocharged and cac engine rated at 1800 rpm, producing up to 167.8 kW. It powers generator sets from Cummins/Onan, including the GGLB. It holds 7.6 L (2.0 gal) of oil and 22.3 L (5.9 gal) of coolant.
Also known as: GM GM8.1L-HO
Part of the General Motors GM8.1L engine family — 2 variants share parts & fitment.
| Oil capacity | 7.6 L |
|---|---|
| Coolant capacity | 22.3 L |
| Displacement | 8.1 L |
| Cylinders | 8 |
| Aspiration | Turbocharged and CAC |
| Rated speed | 1800 rpm |
| Gross power | 167 kW |
Compiled from service & troubleshooting documentation across every generator set that uses the General Motors GM8.1L-HO.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil filter | Single spin-on canister-combination full flow with bypass | — | |||
| Coolant | 122oF (50oC) ambient radiator cooling system | 22.3 L | — | ||
| Oil | 8.0 qt (7.6 L) | 7.6 L | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | AC Waveform Total Harmonic Distortion | <5% total no load to full linear load; <3% for any single harmonic | % | |
| Other | Maximum Coolant Static Head | 10.0 (3.0) | ft (m) | |
| Other | Telephone Harmonic Factor (THF) | <3 | ||
| Other | Telephone Influence Factor (TIF) | <50 | per NEMA MG1-22.43 | |
| Power | BMEP at Rated Load (natural gas, standby) | 200.0 (1379.0) | psi (kPa) | |
| Power | BMEP at Rated Load (propane, standby) | 187 (1289) | psi (kPa) | |
| Power | Regenerative Power | 15.00 | kW | |
| Pressure | Max Back Pressure (exhaust) | 20.0 (5.0) | in H2O (kPa) | |
| Pressure | Maximum Air Cleaner Restriction | 6.0 (1.5) | in H2O (kPa) | |
| Pressure | Maximum Coolant Friction Head | 2.0 (13.8) | psi (kPa) | |
| Speed | Overspeed Limit | 2400 ±50 | rpm | |
| Speed | Piston Speed | 1310.0 (6.7) | ft/min (m/s) | |
| Speed | Random Frequency Variation | ±0.5 | % | |
| Temperature | Exhaust Temperature (natural gas) | 1215.0 (657.2) | oF (oC) | |
| Temperature | Exhaust Temperature (propane) | 1185 (640.5) | oF (oC) | |
| Voltage | Random Voltage Variation | ±1.0 | % | |
| Voltage | Voltage Regulation, No Load to Full Load | ±1.0 | % |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | Natural gas is standard; LP vapor, LP liquid, and dual fuel optional | Minimum operating pressure 5.0 in. H2O (1.2 kPa); maximum operating pressure 13.6 in. H2O (3.4 kPa) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| A029A407 | Gasket, Mixer to Adapter | gasket |
| LF16109 | Filter, Oil (Fleetguard) (Not Shown) | oil_filter |
| 963-0601 | PowerCommand Control (2100 Series) | other_service |
| A026D979 | Converter, Catalytic | other_service |
| A026E804 | Muffler | other_service |
| A026F055 | Muffler | other_service |
| A026H163 | Regulator, Fuel | other_service |
| A026H167 | Regulator, Fuel / Regulator, Fuel (Vapor NG/LP) | other_service |
| A026H171 | Regulator, Fuel | other_service |
| A026H173 | Regulator, Fuel | other_service |
| A026H951 | Control, Fuel | other_service |
| A026H952 | Control, Fuel | other_service |
| A028Z105 | Sender, Low Coolant | sender |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The General Motors GM8.1L-HO engine has an oil capacity of 7.6 liters.
The General Motors GM8.1L-HO has a displacement of 8.1 liters with 8 cylinders.
The General Motors GM8.1L-HO powers 1 generator set(s), including Cummins/Onan GGLB.
A commonly reported issue on generators using the General Motors GM8.1L-HO is: Over Current.