The M88/3 engine had one distinctive feature that set it apart from other powertrains in the German range – a separate throttle for each cylinder. Current engine management technology makes it possible that even a single throttle can be quite controllable, but the fact that a mechanical butterfly is attached to each cylinder requires subtle synchronization, and it becomes a taste. The M88, BMW’s first DOHC head motor, is the supermotor of this era.
At 4,000 rpm or less, the motion is weakly handled with torque, but things change once the revs increase. After 5000, when the motor gets beyond revving, it feels like a sports engine, creating a huge boost to propel and gain speed.
When the speed of the car exceeds 100 km / h, the engine begins to rapidly gain speed and the revs increase noticeably. This is achieved through the use of various technologies from the German concern.
This powertrain was the basis for the S38 motors, which made the company famous among all lovers of fast driving. It was the S38 that was created as a result of exhaust measures with the M88 engine as environmental measures. Improvements were made mainly for North American engines (for the M6), reducing the compression ratio of 10.5: 1 to 9.8: 1.
You can tell the difference in appearance from the head cap logo. M88 if round BMW logo, S38 if it is a large BMW lettering.
Even minor differences in appearance are significant differences between the M88 output 286 horses / 6,500 rpm torque 35 kg-m / 4,500 rpm and the S38 output 260 hp / 6,500 rpm torque 34 kg-m / 4,500 rpm.
M88/3 engine specifications
| Power, hp. | 286 |
| Fuel type | Gasoline |
| Volume, cm*3 | 3453 |
| Maximum torque, N*m (kg*m) at rpm. | 340 (35) / 4500 |
| Fuel consumption, l/100 km | 9.7 |
| Engine type | In-line, 6-cylinder |
| Cylinder diameter, mm | 93.4 |
| Number of valves per cylinder | 4 |
| Maximum power, hp (kW) at rpm. | 286 (210) / 6500 |
| Blower | No |
| Compression ratio | 10.5 |
| Piston stroke, mm | 84 |
Distinctive features from the M88/1 motor
As for the difference between the two engines, some elements have been swapped for others. Several improvements were added to fit the M88 / 1, a racing engine loaded on the M1, to the E24 commercial vehicle.
First, from the dry sump method to the wet sump method to further reduce the production cost and adjustment cost as a mass production engine changed the M88 / 1 double timing chain to single timing chain.
Also, in the M1, the engine is docked vertically to the body of the car, but in the M635 CSi it is mounted with a 30-degree pivot in the engine compartment. This is the beginning of BMW’s inline six cylinder engines.
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