Mazda 122ci Engine Specs

Bore, stroke, displacement and compression for all 4 Mazda 122ci engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	122 ci
Cylinders	4
Bore	3.268–3.386"
Stroke	3.386–3.622"
Advertised power	118–170 hp
Years	1985–2003

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
RF diesel	122 ci	3.3858" × 3.3858"	—	—
FET	122 ci	3.3858" × 3.3858"	—	—
FS-DE	122 ci	3.2677" × 3.622"	—	118–140
FS-DET	122 ci	3.2677" × 3.622"	—	170

Factory cars with a Mazda 122ci

• Mazda 626: 1985; 1986, FET; 1987, FET; 1993, 118 hp; 1994, 118 hp; 1995, 118 hp; 1996; 1997; 1998, 125 hp; 1999, 125 hp; 2000, 130 hp; 2001; 2002, 130 hp
• Mazda MX-6: 1993, 118 hp; 1994, 118 hp; 1995, 118 hp; 1996; 1997
• Mazda Protege: 2001, 130 hp; 2001, 140 hp; 2002, 130 hp; 2003; 2003, 170 hp

What varies across the family

Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.

2 of 4 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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