Mazda BP SOHC 16V Specs: 83 x 85 mm (3.2677 x 3.3465 in), 103 hp

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Mazda BP SOHC 16V specs: 1.839L (112.2 ci) 4-cylinder, 83 x 85 mm (3.2677 x 3.3465 in) bore and stroke, 8.9:1 compression. Rated 103 hp, 1990–1994.

The Mazda BP SOHC 16V is close to square: 3.2677" bore against 3.3465" stroke, within 2.4%, which splits the difference between a high-revving layout and a torque layout. The 3.3465" stroke does not reach 4,000 ft/min of mean piston speed until about 7,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 28.1 ci (460 cc).

8.9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.

It is one of 21 engines in the B-Series family, the largest at 112.2 ci. 5 factory variants share these dimensions, rated at 103 hp across 1990–1994.

Dimensions

Displacement	112.2 ci / 1.839 L
Bore	3.2677"
Stroke	3.3465"
Cylinders	4
Configuration	I4
Compression ratio	8.9:1 *
Bore/stroke ratio	0.976

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

Construction

Block material	cast iron
Head material	aluminum
Valvetrain	DOHC
Fuel type	gas
Advertised HP	103 hp
Years	1990–1994

Factory ratings by year

Year	Version	HP @ rpm	Torque @ rpm	Comp.
1990	BP SOHC 16V net	103 @ 5500 *	111 lb-ft @ 4000 *	8.9:1 *

Factory specification sheet. * Not yet cross-verified.

What these numbers mean

Bore/stroke character	0.976 — square — bore and stroke are within 5%, a balanced compromise
Mean piston speed at 6,000 RPM	3,347 ft/min — conservative for a street engine
Displacement per cylinder	28.1 ci
Static compression	8.9:1 — low by modern standards, generally happy on regular pump fuel

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
1990	103 hp	BP SOHC 16V
1991	—	BP SOHC 16V
1992	—	BP SOHC 16V
1993	—	BP SOHC 16V
1994	—	BP SOHC 16V

What cars have the BP SOHC 16V?

1 factory vehicle, 1990–1994. Each year opens that model's engine table.

• Mazda Protege: 1990, 103 hp; 1991; 1992; 1993; 1994

Similar engines

• Mazda BP Miata NB — 112.2 ci
• Mazda BP-Z3 — 112.2 ci
• Mazda BP-ZE — 112.2 ci
• Mazda BP-ZET — 112.2 ci
• Mazda BP-ZE — 112.2 ci
• Mazda BP-4W — 112.2 ci
• Mazda BP-Z3 — 112.2 ci
• Mazda BP-Z3 turbo — 112.2 ci

← All B-Series engines