Comments by "David Elliott" (@davidelliott5843) on "One Stroke Engines - 200% More Efficient??" video.

  1. A single row Deltic with generator in the middle would be compact and efficient. Six pistons and three combustion chambers. The (expensive) interconnecting gears used by Napier could be replaced with roller chains. People will laugh but chains are highly efficient, very reliable and easy to maintain. Motorcycles all use chains between engine and gearbox. (Ignore the final drive). Regarding emissions check out the Rotax ETech. It’s cleaner and more efficient than competing four strokes.
    4
  2. X format is another option. Four cylinders spaced 90 degrees apart around a single crank. All conrods attach to one wide crank pin. There is zero vibration as all forces cancel out. Air can be fed through the crank case then via transfer ports to the cylinders. Alternatively, an external manifold ring provides air direct via reed valves to the cylinders. Fuel is injected directly into the cylinders after the ports have closed. Fuel pressure is higher than conventional fuel injection but considerably less than diesel injection. Engine runs at constant speed to drive a generator so is optimised for power efficiency and emissions. A basic (dirty) two stroke easily makes 100bhp per litre. DI two strokes use much less oil as there is no surface washing by gasoline and the exhaust catalyst removes anything unburnt in exhaust. DI also solves the part throttle chatter and piston rattle that afflict normal two strokes. Short cylinder life is no longer a problem.
    4
  3. Two stroke engines running at constant speed can be extremely efficient and extremely clean. Drive a generator to keep pace with power demand with batteries to absorb power peaks and troughs. Electric motors drive the wheels. You lose the clutch and gearbox, saving weight cost and power losses.
    1