Oldsmobile LD9 Specs: 3.543 x 3.701 in, 150 hp

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Oldsmobile LD9 specs: 146 ci (2.4L) 4-cylinder, 3.543 x 3.701 in (90 x 94 mm) bore and stroke, 9.7:1 compression. Rated 150 hp, 1999–2001.

The Oldsmobile Quad 4 (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).

9.7:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.

It is one of 5 engines in the Quad 4 family, the largest at 146 ci. 3 factory variants share these dimensions, rated at 150 hp across 1999–2001.

Dimensions

Displacement	146 ci / 2.4 L
Bore	3.5433"
Stroke	3.7008"
Cylinders	4
Configuration	I4
Compression ratio	9.7:1 *
Bore/stroke ratio	0.957

* Compression ratio from a single source; not yet cross-verified.

Construction

Block material	cast iron
Head material	aluminum
Valvetrain	DOHC
Fuel type	gas
Redline	6,500 rpm (factory limit)
Advertised HP	150 hp
Years	1999–2001

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
Static compression	9.7:1 — in the range that usually runs on pump premium

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 (3)

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

Year	Advertised HP	Code
1999	150 hp	LD9
2000	150 hp	LD9
2001	150 hp	LD9

What cars have the LD9?

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

• Buick Skylark: 1996, LD9, 150 hp; 1997, LD9, 150 hp
• 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
• 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

• Oldsmobile LD9 — 146 ci
• Oldsmobile LD2 — 138 ci
• Oldsmobile Quad 4 · 3.622" × 3.346" · 10:1 — 138 ci
• Oldsmobile LD2 — 138 ci
• Oldsmobile 151ci · 4.002" × 3.010" · 8.25:1 — 151 ci
• Oldsmobile 151ci (1986) · 92 hp — 151 ci
• Lexus T24A-FTS — 146 ci
• Lexus T24A-FTS — 146 ci

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