Volkswagen 90ci Specs: 76.5 x 80 mm

Volkswagen 90ci specs: 76.5 x 80 mm (3.0118 x 3.1496 in) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings.

At a glance

Displacement	90 ci
Cylinders	4
Bore	3.012"
Stroke	3.150"
Compression	8.2–23.5:1
Advertised power	48–70 hp
Years	1975–1980

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
FG (1.5 gas)	90 ci	3.0118" × 3.1496"	8.2:1	70
CK (1.5 diesel)	90 ci	3.0118" × 3.1496"	23.5:1	48
FG	90 ci	3.0118" × 3.1496"	8.2:1	—

Factory cars with a Volkswagen 90ci

• Volkswagen Golf / Rabbit / GTI: 1975, FG (1.5 gas), 70 hp; 1977, CK (1.5 diesel), 48 hp; 1978, CK (1.5 diesel), 48 hp; 1979, CK (1.5 diesel), 48 hp; 1980, CK (1.5 diesel), 48 hp
• Volkswagen Scirocco: 1975, FG

What varies across the family

Compression spans 8.2:1 to 23.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.

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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