Honda A-series Specs: 80 x 91 mm

Honda A-series specs: 80 x 91 mm (3.1496 x 3.5827 in) bore and stroke, shared by all 4 versions. Displacement, compression and factory ratings.

At a glance

Displacement	111.7 ci
Cylinders	4
Bore	3.150"
Stroke	3.583"
Compression	9.4:1
Advertised power	86–101 hp
Years	1983–1987

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
A18A	111.7 ci	3.1496" × 3.5827"	9.4:1	—
ES2	111.7 ci	3.1496" × 3.5827"	—	86
ES3	111.7 ci	3.1496" × 3.5827"	—	101
ES1 / A18A, twin carburetors	111.7 ci	3.1496" × 3.5827"	9.4:1	100

Factory cars with a A-series

• Honda Prelude: 1983, 100 hp; 1984, 100 hp; 1985, 100 hp; 1986, 100 hp; 1987, 100 hp
• Honda Accord: 1984, ES2, 86 hp; 1985, ES2, 86 hp; 1985, ES3, 101 hp

What varies across the family

All are undersquare — stroke larger than bore, favouring torque low in the range.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

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