The 3.3-liter BMW M30B33 is a rare carburetor version of the M30 that was installed only in 1973-1975 in the long-wheelbase E3 3.3 L sedan.
It has an 89 mm bore and an 88 mm stroke, giving 3295 cc, and with carburetors produced 190 PS and 289 Nm. The rest of the design is the same as on other M30 engines: cast-iron block, aluminum 12-valve head and a chain-driven camshaft. Later the role of the largest M30 passed to the 3.4- and 3.5-liter M30B34 and M30B35.
M30 family: M30B25, M30B28, M30B30, M30B33, M30B34, M30B35, M30B35LE.
Specifications
| Production years | 1973-1975 |
| Displacement, cc | 3295 |
| Fuel system | carburetor |
| Power output, hp | 190 |
| Torque output, Nm | 289 |
| Cylinder block | cast iron R6 |
| Block head | aluminum 12v |
| Cylinder bore, mm | 89 |
| Piston stroke, mm | 88 |
| Compression ratio | 9.0 |
| Features | SOHC |
| Hydraulic lifters | no |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.5 |
| Fuel type | petrol |
| Weight, kg | 192 |
The engine was installed on:
- BMW E3 in 1973 – 1975 (3.3 L).
Disadvantages of the BMW M30B33 engine
- Even after brief overheating the cylinder head can warp;
- After a rebuild the block often cracks around the cylinder head bolt threads;
- There are no hydraulic lifters: valve clearances need adjusting every 10-20 thousand km, and the adjusters themselves wear out;
- Carburetor versions need competent adjustment, and spare parts for them are getting scarce.
