Mercedes M102 2.5-16 Cosworth Engine Specs, Problems, Reliability

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.

Mercedes M102 2.5 16 Cosworth Engine Specs

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.

Mercedes M102 2.5-16 Cosworth Engine Specs, Problems, Reliability

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.

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.

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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
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