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.
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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.
Mercedes M102 2.0L Engine Specs
|Manufacturer||Stuttgart-Bad Cannstatt Plant|
|Cylinder block material||Cast iron|
|Cylinder head material||Aluminum|
|Fuel system||Fuel Injection Bosch K-jetronic|
|Number of cylinders||4|
|Valves per cylinder||4|
|Bore, mm||95.5 97.3 – EVO I and EVO II|
82.8 – EVO I and EVO II
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 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|