A four-stroke engine uses four motions of a piston to complete ... But it's sloppier, because it burns oil and leaves some fuel unburnt. It uses a different oil, and because it pollutes more ...
The power stroke extracts work from these gases as they expand and force the piston to BDC. In the exhaust stroke, the exhaust valve is open and the combustion products are expelled from the cylinder.
We’re introduced to the traditional two-stroke diesel engine as thermally efficient but not smooth-running, and then the gas turbine as smooth but much more inefficient. The free piston engine ...
Of course, the one thing left out of all these builds is a small motor, preferably one that can run on everything from kerosene to used cooking oil ... Source Two-Stroke Diesel Engine that ...