Mitsubishi 146ci Engine Specs

Bore, stroke, displacement and compression for all 5 Mitsubishi 146ci engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	146 ci
Cylinders	4
Bore	3.405–3.465"
Stroke	3.819–3.937"
Compression	8.5–10.5:1
Advertised power	140–168 hp
Years	1985–2017

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
G64B	146 ci	3.4055" × 3.937"	8.5:1	—
4G64 SOHC	146 ci	3.4055" × 3.937"	—	140–145
4G64 DOHC	146 ci	3.4055" × 3.937"	—	160
4G69	146 ci	3.4252" × 3.937"	—	160–162
4B12	146 ci	3.4646" × 3.8189"	10.5:1	168

Factory cars with a Mitsubishi 146ci

• Mitsubishi Galant: 1985, G64B; 1986, G64B; 1987, G64B; 1994, 141 hp; 1994, 160 hp; 1995, 141 hp; 1996, 141 hp; 1997; 1998; 1999, 145 hp; 2000, 145 hp; 2001, 145 hp; 2002, 145 hp; 2003, 140 hp; 2004, 160 hp; 2005, 160 hp; 2006, 160 hp; 2007, 160 hp; 2008, 160 hp; 2009, 160 hp; 2010, 160 hp; 2011, 160 hp; 2012, 160 hp
• Mitsubishi Lancer: 2004, 162 hp; 2005, 162 hp; 2006, 162 hp; 2009, 168 hp; 2010, 168 hp; 2011, 168 hp; 2012, 168 hp; 2013, 168 hp; 2014, 168 hp; 2015, 168 hp; 2016, 168 hp; 2017, 168 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.

Compression spans 8.5:1 to 10.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.

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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