Mercedes-Benz 333ci Specs: 98 x 90.5 mm

Mercedes-Benz 333ci specs: 98 x 90.5 mm (3.8583 x 3.5630 in) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.

At a glance

Displacement	333 ci
Cylinders	8
Bore	3.858"
Stroke	3.563"
Compression	10.0–10.7:1
Advertised power	382–577 hp
Years	2007–2019

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
M273	333 ci	3.8583" × 3.563"	10.7:1	382
M157	333 ci	3.8583" × 3.563"	10:1	518–577

Factory cars with a Mercedes-Benz 333ci

• Mercedes-Benz E-Class: 2007, M273, 382 hp; 2008, M273, 382 hp; 2009, M273, 382 hp; 2010, M273, 382 hp; 2011, M273, 382 hp; 2012, M157, 518 hp; 2013, M157, 518 hp; 2014, M157; 2015, M157; 2016, M157, 577 hp
• Mercedes-Benz S-Class: 2007, M273; 2008, M273; 2009, M273; 2010, M273; 2011, M273; 2011, M157; 2012, M157; 2013, M157; 2014, M157; 2015, M157; 2016, M157; 2017, M157
• Mercedes-Benz SL: 2007, M273; 2008, M273; 2009, M273; 2010, M273; 2011, M273; 2012, M273; 2013, M157; 2014, M157; 2015, M157; 2016, M157; 2017, M157; 2018, M157; 2019, M157
• Mercedes-Benz G-Class: 2009, M273, 382 hp; 2010, M273, 382 hp; 2011, M273, 382 hp; 2012, M273, 382 hp; 2013, M273; 2013, M157; 2014, M273; 2014, M157; 2015, M157; 2015, M273, 382 hp; 2016, M157; 2017, M157; 2018, M157

What varies across the family

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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