Engine Displacement

If you’re looking to up your engine size then this handy calculator will determine your engine displacement depending on the stroke of crankshaft and the bore of the barrels and pistons.

Engine total displacement is calculated by this calculation:

Bore x Bore x Stroke x 0.0031416

BORE77mm83mm85.5mm87mm90.5mm92mm94mm
STROKE
64mm1192cc1385cc1496cc1521cc1646cc1700cc1776cc
69mm1286cc1493cc1585cc1641cc1776cc1835cc1915cc
74mm1378cc1602cc1699cc1760cc1904cc1968cc2054cc
76mm1416cc1645cc1745cc1807cc1956cc2021cc2110cc
78.8mm1453cc1688cc1791cc1855cc2007cc2074cc2165cc
82mm1527cc1775cc1883cc1950cc2110cc2180cc2276cc
84mm1565cc1818cc1929cc1997cc2161cc2234cc2332cc

BORE

Aircooled VW Engine Displacement Barrels and Pistons

The bore of the engine is the size of the pistons. The larger the diameter the piston the more cubic capacity (cc’s) it has. A 1300cc to 1600cc crankcase can fit up to an 87mm Piston without the need for any machining. Any larger than this will require your crankcase to be machined.

Standard Piston Sizes

1200cc – 77mm

1300cc – 77mm

1500cc – 83mm

1600cc – 85.5mm

STROKE

Aircooled VW Engine Displacement Crankshaft

The measurement of the centre of the crankshaft to the centre of the connecting rod is called the ‘throw’. Multiply this number by two and it will give you the stroke of the engine.

A 1200cc engine uses a 64mm stroke crankshaft. All other Type 1 engine sizes use a 69mm stroke crankshaft as standard.

Longer stroke crankshafts are used to increase the engine displacement. When the stroke is longer, more torque is developed at lower RPM but the issue with larger strokes is a reduction in top end RPM. Maximum stroke in an Aircooled VW crankcase is 84mm (any larger would not fit in the case) this does not cause an issue. So the larger the stroke the better!

Hopefully this information has helped you to calculate your engine displacement. If however you are still unsure then please do not hesitate to contact us.  You can email us at sales@coolairvw.co.uk, Facebook Message us or call our shop on 01322 335050