Mercedes M102 2.5-16 Cosworth Engine Specs, Problems, Reliability. The 2.5-liter 16-valve engine appeared in 1988. It changed the smaller M102 2.3-16v engine, which was the M102 2.3-liter engine mainly with the 16-valve cylinder head. Cosworth created the 2.5-16v.
The engine has the aluminum cylinder head with four valves per cylinder, established and produced by Cosworth, 2 overhead camshafts. The 2.5-liter engine got double-row timing chain to fix snapping problem of a single-row chain.
The 2.5-16 Evolution I came out in 1989. This version had the exact same displacement, however the much shorter stroke and the larger bore size. That allowed a higher rev limitation and moved more power to high rpm. The Development 2 was displayed in 1990. It has the very same bore and stroke, however greater compression ratio and rev limit.
Table of Contents
M102 2.5-16V Engine Problems and Reliability
It needs to be noted that this engine is a high-performance engine and most parts operate on their limitation.
Mercedes M102 2.0L Modifications
- M102.990 (1988 -1993) – 190E 2.5-16.
- M102.991 (1989 -1989) – 190 E 2.5-16 Advancement.
- M102.990 (1990 -1990) – 190 E 2.5-16 Advancement II.
you must see more engine detail in here: Engine – US Cars News or you can see on wiki here
Mercedes M102 2.0L Engine Specs
| Manufacturer | Stuttgart-Bad Cannstatt Plant |
| Production years | 1988-1993 |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Fuel Injection Bosch K-jetronic |
| Configuration | Inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Valvetrain layout | DOHC |
| Bore, mm | 95.5 97.3 – EVO I and EVO II |
| Stroke, mm | 87.2 82.8 – EVO I and EVO II |
| Displacement, cc | 2498 2463 – EVO I and EVO II |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 9.7 (10.5 for EVO II) |
| Power, hp | 204/6750 (194 with Catalyst) 204/6750-7250 (194 with Catalyst) – EVO I 235/7200-7700 – EVO II |
| Torque, lb ft | 177/5000 (173 with Catalyst) 177/5000 (173 with Catalyst) – EVO I; 180/5000 – EVO II |
| Engine weight | – |
| Firing order | 1-3-4-2 |
| Engine oil weight | 0W-30, 0W-40, 5W-30, 5W-40, 5W-50, 10W-40, 10W-50 |
| Engine oil capacity, liter | 6.5 |
| Oil change interval, mile | 6,000 |
| Applications | Mercedes-Benz 190E 2.5-16 |
