I think it is high time to speak about 2 stroke diesel engines openly... 2 stroke diesel engines must have a very good fuel-efficiency and other advantages, too - that is why they are most commonly used in ships (probably only gas turbines have got a better efficiency but they don't have the same flexible RPMs)... You can see the principal of how 2 stroke diesel engines work in the first 3 pictures and then a ready and functional 2 stroke engine - as big as a house...
I question myself why don't we drive passenger cars by 2 stroke diesel engines - maybe we could even increase the fuel-efficiency of hydrogen combustion engines this way... As far as I know there are 3 tasks to complete in order to build 2 stroke diesel engines into passenger cars:
1) 2 stroke diesel engines like to work at constant RPMs - so they are not that flexible either, just like gas turbines... This may result of the compressor-chargers RPMs not depending on the RPMs of the entire engine - this should be changed...
2) The cooling of 2 stroke diesel engines must be difficult as well because they work twice as much as 4 stroke engines... This means you should build a cooling system around the 2 stroke diesel engine that answers the output of the engine - and not its cylinder volume that is used twice as good as in 4 stroke engines...
3) In our modern times you could increase the efficiency of 2 stroke diesel engines, too by downsizing (that means approx. the same as turbo-charging) and by hybrid solutions so that the former ship engines become really cutting-edge car engines... If hydrogen is not flamable like diesel oil then you should create sparks in the combustion chambers as well...
And this way, that means using very efficient 2 stroke diesel technology combined with hydrogen fuel you could probably produce an RPM-flexible and fuel-efficient hydrogen propulsion for passenger cars... We aim to use the entire high energy density of hydrogen - that you can weld and come into space with...
Best wishes, Joseph de la Mikula and Team
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