Engine efficiency

[Old Mechanic]

One of the reasons 4 cylinder otto cycle is desirable is the harmonics of induction and exhaust, IE the intake pulses and exhaust pulses are fairly easy to maintain a relatively smooth air flow on intake and exhaust. 2 cylinder 2 stroke would be close to the same with half the cylinders and the same number of combustion strokes.I'm not talking about the traditional 2 stroke, but the more modern fuel injected 2 strokes than do not need oil mixed in the fuel.

regards
Mech

[Old Tele man]

...wasn't one of Detroits' "...Big-3..." working on a 2-stoke for cars awhile back?

[Frank Lee]

GM and Chrysler were; dunno about Ford. Orbital Company's 2-stroke tech was all the rage in the '90s before it failed to produce.

[Old Mechanic]

Frank I think you might see the orbital design in outboards. Fitch or something like that.

regards
Mech

[Frank Lee]

There were all kinds of industries looking at/evaluating/licensing Orbital tech back then. Automotive looked at it too but as we can see it hasn't panned out.

[Old Mechanic]

Apparently they discarded the orbital design and replaced with DI and oil injection. Interesting that the 2 stroke is lower emissions than the other 4 stroke outboards.

Evinrude Outboard Motors - Wikipedia, the free encyclopedia

regards
Mech

[Old Mechanic]

Two strokes strike back :: Two Stroke Motocross

regards
Mech

[oil pan 4]

2 stroke car engines were used up till about 1990 in some parts of the world.

[Old Mechanic]

Reinventing the Gasoline Engine - Technology Review

regards
Mech

[Frank Lee]

^ I like that liquid spark plug. I want it.