over square

adjective

Of an internal combustion engine design, in which the diameter of the piston is greater than its stroke distance.

Opposite
under square
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Meanings

adjectiveover square (not comparable)

alternative over-square · alternative oversquare

  1. not comparableautomotiveOf an internal combustion engine design, in which the diameter of the piston is greater than its stroke distance.

    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.

    2012, Donny Peterson, Donny's Unauthorized Technical Guide to Harley-Davidson, 1936 to Present

Synonyms & antonyms

Opposite
under square
Cite this entry
APA

over square. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/over%20square

MLA

“over square.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/over%20square. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “over square,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/over%20square.

Source: over square on Wiktionary, CC BY-SA 4.0.