Porsche 66ci Specs: 73.5 x 64 mm

Porsche 66ci specs: 73.5 x 64 mm (2.8937 x 2.5197 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	66 ci
Cylinders	4
Bore	2.894"
Stroke	2.520"
Compression	7.0:1
Advertised power	40 hp
Years	1950–1954

This engine

Engine	Displacement	Bore × Stroke	CR	HP
369	66 ci	2.8937" × 2.5197"	7:1	40

Factory cars with a Porsche 66ci

• Porsche 356: 1950, 40 hp; 1951, 40 hp; 1952, 40 hp; 1953, 40 hp; 1954, 40 hp

What varies across the family

This family is represented by a single engine in the database: 66 ci, 4 cylinders, a 2.8937" × 2.5197" bore and stroke.

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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