Triumph 70ci Specs: 69.3 x 75.9 mm

Triumph 70ci specs: 69.3 x 75.9 mm (2.7300 x 2.9900 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	70 ci
Cylinders	4
Bore	2.730"
Stroke	2.990"
Compression	9.0:1
Advertised power	63 hp
Years	1963–1967

This engine

Engine	Displacement	Bore × Stroke	CR	HP
FC	70 ci	2.73" × 2.99"	9:1	63

Factory cars with a Triumph 70ci

• Triumph Spitfire: 1963, FC, 63 hp; 1964, FC, 63 hp; 1965, FC; 1966, FC; 1967, FC

What varies across the family

This family is represented by a single engine in the database: 70 ci, 4 cylinders, a 2.73" × 2.99" bore and stroke.

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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