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Jeep 6-226 specs: 226 ci 6-cylinder, 3.313 x 4.375 in (84.1 x 111.1 mm) bore and stroke, 6.86:1 compression. Rated 105-115 hp, 1954–1962.
The Jeep 6-226 is undersquare — the 4.375" stroke exceeds the 3.3125" bore by 24.3% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.375" stroke, mean piston speed reaches 4,000 ft/min at only 5,500 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 6 cylinders displaces 37.7 ci (617 cc).
6.86:1 is low by modern standards and generally happy on regular pump fuel.
9 factory variants share these dimensions, rated from 105 to 115 hp across 1954–1962.
| Displacement | 226 ci |
|---|---|
| Bore | 3.3125" |
| Stroke | 4.375" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 6.86:1 |
| Bore/stroke ratio | 0.757 |
| Fuel type | gas |
|---|---|
| Advertised HP | 105–115 hp |
| Years | 1954–1962 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1961 | gross | 105 @ 3600 | 190 lb-ft @ 1400 | 6.86:1 |
Factory specification sheet.
| Bore/stroke character | 0.757 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,375 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.7 ci |
| Static compression | 6.86:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1954 | 115 hp | 6-226 |
| 1955 | 115 hp | 6-226 |
| 1956 | 115 hp | 6-226 |
| 1957 | 115 hp | 6-226 |
| 1958 | 115 hp | 6-226 |
| 1959 | 105 hp | 6-226 |
| 1960 | 105 hp | 6-226 |
| 1961 | 105 hp | 6-226 |
| 1962 | 105 hp | 6-226 |
2 factory vehicles, 1954–1962. Each year opens that model's engine table.