GMC LYX Specs: 2.913 x 3.409 in, 170 hp

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GMC LYX specs: 90.8 ci (1.5L) 4-cylinder, 2.913 x 3.409 in (74 x 86.6 mm) bore and stroke. Rated 170 hp, 2018–2022. Used in the GMC Terrain. DOHC.

The GMC Ecotec I4 (LYX) is undersquare — the 3.4094" stroke exceeds the 2.9134" bore by 14.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4094" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.7 ci (372 cc).

It is one of 9 engines in the Ecotec I4 family, sitting between the 83.2 ci and 145 ci members. 5 factory variants share these dimensions, rated at 170 hp across 2018–2022.

Dimensions

Displacement	90.8 ci / 1.5 L
Bore	2.9134"
Stroke	3.4094"
Cylinders	4
Configuration	I4
Bore/stroke ratio	0.855

Construction

Block material	aluminum
Head material	aluminum
Valvetrain	DOHC
Fuel type	gas
Advertised HP	170 hp
Years	2018–2022

Factory ratings by year

Year	Version	HP @ rpm	Torque @ rpm	Comp.
2018	LYX net	170 @ 5600 *	203 lb-ft @ 2000-4000 *	—
2020	LYX net	170 @ 5600 *	203 lb-ft @ 2000-4000 *	—
2021	LYX net	170 @ 5600 *	203 lb-ft @ 2000-4000 *	—
2022	LYX net	170 @ 5600 *	203 lb-ft @ 2000 *	—

Factory specification sheet. * Not yet cross-verified.

What these numbers mean

Bore/stroke character	0.855 — undersquare — stroke exceeds bore, which favours low-end torque
Mean piston speed at 6,000 RPM	3,409 ft/min — conservative for a street engine
Displacement per cylinder	22.7 ci

Run the numbers for this engine

Each link opens the calculator with this engine's specs already filled in.

• Displacement from bore and stroke (calculator)
• Static and dynamic compression ratio calculator
• Piston ring gap for this bore
• Piston speed at any RPM
• Horsepower to torque at any RPM
• What size carburetor (CFM calculator)

Variants sharing these dimensions (5)

These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.

Year	Advertised HP	Code
2018	170 hp	LYX
2019	170 hp	LYX
2020	170 hp	LYX
2021	170 hp	LYX
2022	170 hp	LYX

What cars have the LYX?

1 factory vehicle, 2018–2022. Each year opens that model's engine table.

• GMC Terrain: 2018, LYX, 170 hp; 2019, LYX, 170 hp; 2020, LYX, 170 hp; 2021, LYX, 170 hp; 2022, LYX, 170 hp

Similar engines

• GMC LFV — 90.8 ci
• GMC LSD — 90.8 ci
• GMC LUV — 83.2 ci
• GMC Ecotec I4 · 3.386" × 3.386" · 9.2:1 — 122 ci
• GMC LH7 — 98 ci
• GMC LR1 — 119 ci
• Chevrolet LYX — 90.8 ci
• Chevrolet LSD — 90.8 ci

← All Ecotec I4 engines