oversquare engine

oversquare engine

[′ō·vər‚skwer ′en·jən]
(mechanical engineering)
An engine with bore diameter greater than the stroke length.
References in periodicals archive ?
There is higher peak piston acceleration, again due to the fact that the piston has to cover a longer distance at a given rpm compared to square or oversquare engines, but increased piston speeds do not necessarily equate to increased engine speed.