The most powerful variant of the S50 was introduced as a replacement for the 3-liter S50EU. This motor was installed on the updated M3 E36 (except for the models for North America and Canada, which were equipped with the S52 engine).
The 3.2-liter BMW S50B32 engine was supplied with a new Bi-VANOS valve timing system, the valves were changed (the intake diameter was increased to 35 mm, the outlet diameter remained the same, the valve stem thickness decreased from 7 mm to 6 mm). The two-mass flywheel, the outlet system, and the thicker and shorter inlet have also undergone changes.
S50 family: S50B30, S50B32.
Specifications
| Production years | 1995-2000 |
| Displacement, cc | 3201 |
| Fuel system | injector |
| Power output, hp | 321 /7400 rpm 310 /7400 rpm |
| Torque output, Nm | 350 /3250 rpm 340 /3250 rpm |
| Cylinder block | cast iron R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 86.4 |
| Piston stroke, mm | 91 |
| Compression ratio | 11.3 |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Turbocharging | no |
| Recommended engine oil | 0W-30 / 0W-40 / 5W-30 / 5W-40 / 10W-40/ 15W-40 |
| Engine oil capacity, liter | 5.5 |
| Fuel type | petrol |
| Euro standards | Euro 2 |
| Fuel consumption, L/100 km — city — highway — combined |
16.9 7.5 11.0 |
| Engine lifespan, km | ~400 000 |
| Weight, kg | 154 |
| Max engine speed, rpm | 7600 |
| Oil consumption, gr/1000 km | up to 1000 |
| Transmission — 6MT — SMG I |
Getrag 420G Getrag 420G |
| Gear ratios | 1 — 4.23 2 — 2.51 3 — 1.67 4 — 1.23 5 — 1.00 6 — 0.83 |
| Final drive ratio — 6MT — SMG I |
3.23 3.23 |
The engine was installed on:
- BMW M3-Series E36 in 1995 – 1999;
- BMW Z3 M-Series E36/7 in 1996 – 2000 (M Roadster and M Coupe).
Disadvantages of the S50B32 engine
The main malfunctions in the operation of the S50B32 engine: overheating, increased oil consumption, leaks, problems with the Vanos system, floating speed and air leaks at the intake.
If the engine triples, checking the ignition coils, injectors and spark plugs is required. With unstable speeds, the cause is sought in the idle valve, which may fail. It is enough to carry out cleaning, and the motor will be restored. If the problem persists, inspect the temperature sensor, throttle position sensor, lambda probe, clean the throttle valve.
The rattling engine causes the Vanos system to break down. As a result, the engine loses power, the speed becomes unstable. To restore functionality, you will need a vanos repair kit.
If you notice an increased oil consumption, check if the gaskets of the valve cover, sump are leaking, exclude leakage through the oil dipstick. The check is necessary for the expansion tank. If it is cracked, antifreeze will leak. Crankshaft, camshaft and coolant temperature sensors break down periodically.
Frequently asked questions about the BMW S50B32
How much power does the BMW S50B32 make?
Power output of the BMW S50B32, hp: 321 /7400 rpm; 310 /7400 rpm. Torque, Nm: 350 /3250 rpm; 340 /3250 rpm.
How much oil does the BMW S50B32 take and which one?
Engine oil capacity: 5.5 liters. Recommended oil: 0W-30 / 0W-40 / 5W-30 / 5W-40 / 10W-40/ 15W-40.
Does the BMW S50B32 have a timing belt or chain?
The BMW S50B32 uses a timing chain.
Is the BMW S50B32 turbocharged?
No, the BMW S50B32 is naturally aspirated.
Does the BMW S50B32 need valve clearance adjustment?
No, the BMW S50B32 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the BMW S50B32 last?
The typical lifespan of the BMW S50B32 is ~400 000 km with proper maintenance.
What cars was the BMW S50B32 installed on?
BMW M3-Series E36 in 1995 - 1999; BMW Z3 M-Series E36/7 in 1996 - 2000 (M Roadster and M Coupe).
What engines are related to the BMW S50B32?
S50 family: S50B30.
