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GMC 8V92 specs: 736 ci (12.1L) 8-cylinder, 4.84 x 5.00 in (122.9 x 127 mm) bore and stroke, 17:1 compression. Rated 450 hp. OHV. Rod ratio and piston speed.
The GMC 8V92 is close to square: 4.84" bore against 5" stroke, within 3.2%, which splits the difference between a high-revving layout and a torque layout. With a 5" stroke, mean piston speed reaches 4,000 ft/min at only 4,800 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 8 cylinders displaces 92.0 ci (1,508 cc).
At 17:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 5 engines in the Detroit Diesel V8 (Two-Stroke) family, the largest at 736 ci. Factory fitments include the GMC General, Freightliner FLC, Kenworth W900 and 2 others.
| Displacement | 736 ci / 12.1 L |
|---|---|
| Bore | 4.84" |
| Stroke | 5" |
| Cylinders | 8 |
| Compression ratio | 17:1 |
| Bore/stroke ratio | 0.968 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | diesel |
| Advertised HP | 450 hp |
| Bore/stroke character | 0.968 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 5,000 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
| Displacement per cylinder | 92.0 ci |
| Static compression | 17:1 — high enough that pump premium or better is normally required |
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