Volvo 109ci Specs: 84.1 x 80 mm

Volvo 109ci specs: 84.1 x 80 mm (3.3126 x 3.1496 in) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	109 ci
Cylinders	4
Bore	3.313"
Stroke	3.150"
Compression	10.0:1
Advertised power	100–115 hp
Years	1961–1968

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
B18D	109 ci	3.3126" × 3.1496"	—	—
B18B	109 ci	3.3126" × 3.1496"	10:1	100–115

Factory cars with a Volvo 109ci

• Volvo P1800: 1961, B18B, 100 hp; 1962, B18B, 100 hp; 1963, B18B, 100 hp; 1964, B18B, 108 hp; 1965, B18B, 108 hp; 1966, B18B, 115 hp; 1967, B18B, 115 hp; 1968, B18B, 115 hp
• Volvo Amazon: 1962, B18D; 1963, B18D; 1964, B18D; 1965, B18D; 1966, B18D; 1967, B18D; 1968, B18D

What varies across the family

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

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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