The Weslake A80 is a liquid cooled, two-stroke, opposed piston, 1332 cc Diesel aircraft engine, produced by Weslake.
[1][2] This opposed piston aero-engine appears superficially similar to a true flat-four "boxer" engine, but is actually significantly different.
It has two ported cylinders with a crankshaft at each end and four pistons in total.
This engine is similar to the prototype Diesel Air engine, which was built for Diesel Air[3] by Weslake, but which has to date failed to reach volume production.
Each crankshaft is linked by an idler gear to a centre shaft.