Porsche 121ci Engine Specs

Bore, stroke, displacement and compression for all 8 Porsche 121ci engines, compared side by side. Plus rod ratio and head specs where published.

At a glance

Displacement	121 ci
Cylinders	6
Advertised power	125–180 hp
Years	1965–1969

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
901/01	121 ci	—	—	148
901/01; 901/05 from mid-1966	121 ci	—	—	148
901/05	121 ci	—	—	148
901/02	121 ci	—	—	180
901/14, 901/17 - US/Canada	121 ci	—	—	148
901/16, 901/19	121 ci	—	—	125
901/09, 901/11	121 ci	—	—	140
901/10	121 ci	—	—	170

Factory cars with a Porsche 121ci

• Porsche 911: 1965, 148 hp; 1966, 148 hp; 1967, 148 hp; 1967, 180 hp; 1968, 148 hp; 1969, 125 hp; 1969, 140 PS; 1969, 170 PS

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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