Definition from Wiktionary, the free dictionary
See also: oversquare
- (automotive) Of an internal combustion engine design, in which the diameter of the piston is greater than its stroke distance.
2012, Donny Peterson, Donny's Unauthorized Technical Guide to Harley-Davidson, 1936 to Present:
- An over square or short stroke engine occurs when the cylinder bore diameter is greater than its stroke length, giving a bore/stroke ratio greater than 1:1. An over square engine allows for larger valves in the cylinder head because the wider bore creates a broader combustion chamber.