Honda EW1 Specs: 74 x 86.5 mm (2.9134 x 3.4055 in), 76 hp

See other engines in this family

Honda EW1 specs: 1.5L (90.8 ci) 4-cylinder, 74 x 86.5 mm (2.9134 x 3.4055 in) bore and stroke, 9.2:1 compression. Rated 76 hp, 1984–1987.

The Honda E-series (EW1) is undersquare — the 3.4055" stroke exceeds the 2.9134" bore by 14.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4055" 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).

9.2:1 is low by modern standards and generally happy on regular pump fuel.

It is one of 10 engines in the E-series family, sitting between the 81.9 ci and 97.6 ci members. 4 factory variants share these dimensions, rated at 76 hp across 1984–1987.

Dimensions

Displacement	90.8 ci / 1.5 L
Bore	2.9134"
Stroke	3.4055"
Cylinders	4
Configuration	I4
Compression ratio	9.2:1
Bore/stroke ratio	0.855

Construction

Valvetrain	SOHC
Fuel type	gas
Advertised HP	76 hp
Years	1984–1987

Factory ratings by year

Year	Version	HP @ rpm	Torque @ rpm	Comp.
1984	EW1 net	76 @ 6000	84 lb-ft @ 3500	9.2:1
1986	EW1 net	76 @ 6000	84 lb-ft @ 3500	9.2:1

Factory specification sheet.

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	3,406 ft/min — conservative for a street engine
Displacement per cylinder	22.7 ci
Static compression	9.2:1 — 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 (4)

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

Year	Advertised HP	Code
1984	76 hp	EW1
1985	—	EW1
1986	76 hp	EW1
1987	—	EW1

What cars have the EW1?

1 factory vehicle, 1984–1987. Each year opens that model's engine table.

• Honda Civic: 1984, EW1, 76 hp; 1985, EW1; 1986, EW1, 76 hp; 1987, EW1

Similar engines

• Honda ED EM EW — 90.8 ci
• Honda ED — 90.8 ci
• Honda EM — 90.8 ci
• Honda EW — 90.8 ci
• Honda EW3/EW4 — 90.8 ci
• Honda 91ci (2007–2020) — 91 ci
• GMC LFV — 90.8 ci
• GMC LYX — 90.8 ci

← All E-series engines