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Mercedes-Benz M113 E55 specs: 5.4L (332.5 ci) 8-cylinder, 97 x 92 mm (3.8189 x 3.6220 in) bore and stroke, 10.5:1 compression. Rated 349 hp. SOHC.
The Mercedes-Benz M113 E55 is oversquare — the 3.8189" bore exceeds the 3.622" stroke by 5.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 41.6 ci (681 cc).
10.5:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 4 engines in the M113 family, the largest at 332.5 ci. Factory fitments include the Mercedes-Benz C55 AMG (W202), Mercedes-Benz E55 AMG (W210), Mercedes-Benz CLK55 AMG (C208) and 3 others.
| Displacement | 332.5 ci / 5.4 L |
|---|---|
| Bore | 3.8189" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.054 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 349 hp |
| Bore/stroke character | 1.054 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 41.6 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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