Audi 255ci Specs: 84.5 x 92.8 mm

Audi 255ci specs: 84.5 x 92.8 mm (3.3268 x 3.6535 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	255 ci
Cylinders	8
Bore	3.327"
Stroke	3.654"
Compression	11.0:1
Advertised power	340 hp
Years	2004–2009

This engine

Engine	Displacement	Bore × Stroke	CR	HP
BBK / BHF	255 ci	3.3268" × 3.6535"	11:1	340

Factory cars with a Audi 255ci

• Audi A4 / S4: 2004, BBK / BHF; 2005, BBK / BHF; 2006, BBK / BHF; 2007, BBK / BHF; 2008, BBK / BHF, 340 hp; 2009, BBK / BHF, 340 hp

What varies across the family

This family is represented by a single engine in the database: 255 ci, 8 cylinders, a 3.3268" × 3.6535" bore and stroke.

All are undersquare — stroke larger than bore, favouring torque low in the range.

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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