BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP engine DIY maintenance and service manual

General Information

BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP is an 2494 cc (2.19 UK qt.) internal combustion reciprocating Inline 6 engine. It has bore/stroke ratio of 84 mm × 75 mm (3.31 in × 2.95 in). This engine was rated 125 kW (167.63 hp). It was used in BMW cars.

Engine Performance Rating

SAE J1349 (SAE Net)

BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	125 kW (167.63 hp)

Specifications

General

BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Gasoline
Cylinder Configuration	Inline 6
Engine Displacement	152.19 in³152.19 in³2494 cc
Bore	3.31 in3.31 in84 mm
Stroke	2.95 in2.95 in75 mm

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Engine head and valvetrain

BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP engine head and valvetrain specifications.
Parameter	Value
Valvetrain Type	CIH
Valves per Cylinder	2

Air Intake

BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP air intake specifications.
Parameter	Value
Air Intake Method	Naturally Aspirated

Fuel Injection

BMW gasoline straight-6 2.5 L M20 B25 (256K1) 168 HP fuel injection specifications.
Parameter	Value
Injection Type	Carburetor
Injection Info	Intake Manifold Injection/ Carburettor