Chevrolet LD9 Specs: 3.543 x 3.701 in, 150 hp

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Chevrolet LD9 specs: 146 ci (2.4L) 4-cylinder, 3.543 x 3.701 in (90 x 94 mm) bore and stroke. Rated 150 hp, 1996–2002. Used in the Chevrolet Cavalier. DOHC.

The Chevrolet 146ci (LD9) is close to square: 3.5433" bore against 3.7008" stroke, within 4.3%, which splits the difference between a high-revving layout and a torque layout. The 3.7008" stroke puts mean piston speed at 4,000 ft/min around 6,500 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.5 ci (598 cc).

It is one of 4 engines in the Chevrolet 146ci family, all of them 146 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions, rated at 150 hp across 1996–2002.

Dimensions

Displacement	146 ci / 2.4 L
Bore	3.5433"
Stroke	3.7008"
Cylinders	4
Configuration	I4
Compression ratio	9.5–9.7:1 (published figures vary)
Bore/stroke ratio	0.957

Construction

Block material	cast iron
Head material	aluminum
Valvetrain	DOHC
Fuel type	gas
Redline	6,500 rpm (factory limit)
Advertised HP	150 hp
Years	1996–2002

Factory ratings by year

Year	Version	HP @ rpm	Torque @ rpm	Comp.
1999	LD9 net	150 @ 6000	155 lb-ft @ 4400	9.5:1

Factory specification sheet.

What these numbers mean

Bore/stroke character	0.957 — square — bore and stroke are within 5%, a balanced compromise
Mean piston speed at 6,000 RPM	3,701 ft/min — in the range typical of performance street engines
Displacement per cylinder	36.5 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 (8)

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

Year	Advertised HP	Code
1996	150 hp	LD9
1997	150 hp	LD9
1998	150 hp	LD9
1999	150 hp	LD9
2000	—	LD9
2000	150 hp	LD9
2001	150 hp	LD9
2002	150 hp	LD9

What cars have the LD9?

6 factory vehicles, 1996–2002. Each year opens that model's engine table.

• Chevrolet Cavalier: 1996, LD9, 150 hp; 1997, LD9, 150 hp; 1998, LD9, 150 hp; 1999, LD9, 150 hp; 2000, LD9, 150 hp; 2001, LD9, 150 hp; 2002, LD9, 150 hp
• Buick Skylark: 1996, LD9, 150 hp; 1997, LD9, 150 hp
• Pontiac Grand Am: 1996, LD9, 150 hp; 1997, LD9, 150 hp; 1998, LD9, 150 hp; 1999, LD9, 150 hp; 2000, LD9, 150 hp; 2001, LD9, 150 hp
• Pontiac Sunfire: 1996, LD9, 150 hp; 1997, LD9, 150 hp; 1998, LD9, 150 hp; 1999, LD9, 150 hp; 2000, LD9, 150 hp; 2001, LD9, 150 hp; 2002, LD9, 150 hp
• Chevrolet Malibu: 1997, LD9, 150 hp; 1998, LD9, 150 hp; 1999, LD9, 150 hp; 2000, LD9
• Oldsmobile Alero: 1999, LD9, 150 hp; 2000, LD9, 150 hp; 2001, LD9, 150 hp

Similar engines

• Chevrolet LUK — 146 ci
• Chevrolet LAT — 146 ci
• Chevrolet 146ci (2012) — 146 ci
• Chevrolet 145ci (2006) · 171 hp — 145 ci
• Chevrolet RPO 649 — 145 ci
• Chevrolet base engine with Powerglide in Monza 900 — 145 ci
• Lexus T24A-FTS — 146 ci
• Lexus T24A-FTS — 146 ci

← All Chevrolet 146ci engines