Kia 144ci Specs: 88 x 97 mm

Kia 144ci specs: 88 x 97 mm (3.4646 x 3.8189 in) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	144 ci
Cylinders	4
Bore	3.465"
Stroke	3.819"
Compression	10.0–13.0:1
Advertised power	161–200 hp
Years	2006–2020

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
G4JS	144 ci	3.4646" × 3.8189"	10:1	—
G4KC	144 ci	3.4646" × 3.8189"	10.5:1	161
G4KE	144 ci	3.4646" × 3.8189"	10.5:1	175
G4KK	144 ci	3.4646" × 3.8189"	13:1	199
G4KJ	144 ci	3.4646" × 3.8189"	11.3:1	185–200

Factory cars with a Kia 144ci

• Kia Optima / K5: 2006, G4JS; 2006, G4KC, 161 hp; 2007, G4KC, 161 hp; 2008, G4KC, 161 hp; 2009, G4KE, 175 hp; 2010, G4KE, 175 hp; 2011, G4KK; 2011, G4KJ, 200 hp; 2012, G4KK; 2012, G4KJ, 200 hp; 2013, G4KK; 2013, G4KJ, 200 hp; 2014, G4KJ; 2014, G4KK, 192–199 hp; 2015, G4KJ; 2015, G4KK; 2016, G4KJ, 185 hp; 2016, G4KK, 199 hp; 2017, G4KJ; 2018, G4KJ, 185 hp; 2019, G4KJ, 185 hp; 2020, G4KJ

What varies across the family

Compression spans 10:1 to 13:1, 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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