Porsche MA1 Specs: 102 x 77.5 mm

Porsche MA1 specs: 102 x 77.5 mm (4.0157 x 3.0512 in) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings.

At a glance

Displacement	231.9 ci
Cylinders	6
Bore	4.016"
Stroke	3.051"
Compression	12.5:1
Advertised power	385–700 hp
Years	2009–2019

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
MA1/01	231.9 ci	4.0157" × 3.0512"	12.5:1	385
9A1	231.9 ci	4.0157" × 3.0512"	—	385–700
9A1 Powerkit	231.9 ci	4.0157" × 3.0512"	—	408–430

Factory cars with a MA1

• Porsche 911: 2009, 385 hp; 2010, 385 hp; 2010, 500 hp; 2011, 385 hp; 2011, 408 hp; 2011, 500 hp; 2011, 530 hp; 2012, 385 hp; 2012, 400 hp; 2012, 408 hp; 2012, 500 hp; 2012, 530 hp; 2013, 400 hp; 2013, 500 hp; 2013, 530 hp; 2014, 400 hp; 2014, 430 hp; 2014, 475 hp; 2014, 520 hp; 2014, 560 hp; 2015, 400 hp; 2015, 430 hp; 2015, 475 hp; 2015, 520 hp; 2015, 560 hp; 2016, 400 hp; 2016, 430 hp; 2016, 475 hp; 2016, 520 hp; 2016, 560 hp; 2017, 540 hp; 2017, 580 hp; 2018; 2018, 540 hp; 2018, 580 hp; 2018, 700 hp; 2019; 2019, 540 hp; 2019, 580 hp; 2019, 700 hp

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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