Bourke engine design features

The following design features have been identified

Scotch yoke instead of connecting rods to translate linear motion to rotary motion
Scotch Yoke does not create sideforces on piston, reducing friction and vibration
Fewer (only 3) moving parts
Smoother operation due to elimination of crank and slider mechanism
Longer percentage of cycle spent at top dead center and bottom-dead-center for more complete combustion and exhaust scavenging
One power stroke per piston, for every rotation from the opposed pistons instead of one every other rotation resulting in nearly twice the power at a given engine speed, compared with a 4-stroke engine.
Eliminate the need to mix oil with the fuel as with standard two-stroke engines
Prevents the piston ring blow by from polluting the crankcase oil extending the life of the oil
Low exhaust temperature (below that of boiling water) so metal exhaust components are not required, plastic ones can be used
Extremely fast burn time of the fuel air mixture so the engine can be considered to be a detonation or "explosion" engine.
15:1 compression ratio for high efficiency
Multifuel capability - although different fuels will need different compression ratios.
Fuel is vaporised by the high temperature in the transfer port, and the mechanical action in the combustion chamber.
Lean burn for increased efficiency and reduced emissions
The piston is connected to the Scotch yoke through a "triple slipper bearing" (a type of hydrodynamic tilting-pad fluid bearing).
Piston shape, with higher volume around edges, contributes to complete explosive burn.

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