Mazda 138ci Specs: 80.3 x 74.2 mm

Mazda 138ci specs: 80.3 x 74.2 mm (3.1614 x 2.9213 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	138 ci
Cylinders	6
Bore	3.161"
Stroke	2.921"
Advertised power	210 hp
Years	1995–2002

This engine

Engine	Displacement	Bore × Stroke	CR	HP
KJ-ZEM	138 ci	3.1614" × 2.9213"	—	210

Factory cars with a Mazda 138ci

• Mazda Millenia: 1995, 210 hp; 1996, 210 hp; 1997, 210 hp; 1998, 210 hp; 1999, 210 hp; 2000, 210 hp; 2001, 210 hp; 2002, 210 hp

What varies across the family

This family is represented by a single engine in the database: 138 ci, 6 cylinders, a 3.1614" × 2.9213" 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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