BMW 305ci Specs: 92 x 75.2 mm

BMW 305ci specs: 92 x 75.2 mm (3.6220 x 2.9606 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.

At a glance

Displacement	305 ci
Cylinders	10
Bore	3.622"
Stroke	2.961"
Compression	12.0:1
Advertised power	500 hp
Years	2006–2010

This engine

Engine	Displacement	Bore × Stroke	CR	HP
S85B50	305 ci	3.622" × 2.9606"	12:1	500

Factory cars with a BMW 305ci

• BMW 5 Series: 2006, 500 hp; 2007, 500 hp; 2008, 500 hp; 2009, 500 hp; 2010, 500 hp
• BMW 6 Series: 2006, 500 hp; 2007, 500 hp; 2008, 500 hp; 2009, 500 hp; 2010, 500 hp

What varies across the family

This family is represented by a single engine in the database: 305 ci, 10 cylinders, a 3.622" × 2.9606" bore and stroke.

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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