BMW 152ci Specs: 84 x 75 mm

BMW 152ci specs: 84 x 75 mm (3.3071 x 2.9528 in) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	152 ci
Cylinders	6
Bore	3.307"
Stroke	2.953"
Compression	8.8–10.5:1
Advertised power	168–189 hp
Years	1987–2006

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
M20B25	152 ci	3.3071" × 2.9528"	8.8:1	168
M50B25	152 ci	3.3071" × 2.9528"	—	189
M52B25	152 ci	3.3071" × 2.9528"	10.5:1	—
M52TUB25	152 ci	3.3071" × 2.9528"	10.5:1	170
M54B25	152 ci	3.3071" × 2.9528"	10.5:1	184

Factory cars with a BMW 152ci

• BMW 3 Series / M3: 1987, 168 hp; 1988, 168 hp; 1989, 168 hp; 1990, 168 hp; 1991, 168 hp; 1992, 168 hp; 1992, 189 hp; 1993, 168 hp; 1993, 189 hp; 1994, 189 hp; 1995, 189 hp; 1998; 1999; 1999, 170 hp; 2000, 170 hp; 2001, 184 hp; 2002, 184 hp; 2003, 184 hp; 2004, 184 hp; 2005, 184 hp; 2006, 184 hp
• BMW 5 Series: 1989; 1990; 1991; 1992; 1993; 1994; 1995; 2001, 184 hp; 2002, 184 hp; 2003, 184 hp; 2004, 184 hp; 2005, 184 hp
• BMW Z3: 1999, 170 hp; 2000, 170 hp; 2001, 184 hp; 2002, 184 hp
• BMW Z4: 2003, 184 hp; 2004, 184 hp; 2005, 184 hp

What varies across the family

Compression spans 8.8:1 to 10.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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