Volkswagen Type 4 Air-cooled Engine Specs

Bore, stroke, displacement and compression for all 5 Volkswagen Type 4 Air-cooled engines, compared side by side. Free spec reference.

At a glance

Displacement	102.5–109.4 ci
Cylinders	4
Bore	3.543–3.661"
Stroke	2.598"
Advertised power	63–67 hp
Years	1972–1975

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
AW	109.4 ci	3.6614" × 2.5984"	—	—
AW	109.4 ci	3.6614" × 2.5984"	—	—
ED	109.4 ci	3.6614" × 2.5984"	—	67
CB	102.5 ci	3.5433" × 2.5984"	—	—
CB	102.5 ci	3.5433" × 2.5984"	—	63

Factory cars with a Type 4 Air-cooled

• Volkswagen Type 2 Bus / Vanagon: 1972, CB, 63 hp; 1973, CB, 63 hp; 1974, AW; 1975, ED, 67 hp

What varies across the family

Stroke is constant at 2.5984" across the family — the displacement spread comes from bore, so these share a crank and differ in the block.

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.

← All Volkswagen engines