See other engines in this family
Jeep Buick 225 specs: 225 ci (3.7L) 6-cylinder, 3.752 x 3.402 in (95.3 x 86.4 mm) bore and stroke, 9:1 compression. Rated 160 hp. Rod ratio and piston speed.
The Jeep Buick 225 is oversquare — the 3.752" bore exceeds the 3.4016" stroke by 10.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4016" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 37.5 ci (615 cc).
9:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Dauntless family, the smallest at 225 ci. Factory fitments include the CJ-5, CJ-6, Jeepster Commando.
| Displacement | 225 ci / 3.7 L |
|---|---|
| Bore | 3.752" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.103 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 160 hp |
| Bore/stroke character | 1.103 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.5 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.