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I'm interested in ways of regaining energy lost in ICEs, so the 6-stroke appeals to me. I reckon it might work well in a ported 2-stroke diesel (eg the Commer opposed piston design in the UK in the 50s & 60s), which would make it a 4-stroke.
In its simplest form, the fuel pump would run at half engine speed (instead of engine speed) & another pump would squirt water (through the same injector, which means it would be lubricated on the fuel cycle) at alternate strokes.
This means the water would be finely sprayed into hot compressed air as well as on to the hot surfaces inside. Most of the negative energy used in compressing & therefore heating the air (which wouldn't occur in a 'normal' 6-stroke) would be recovered by the 'spring' effect of the air pushing the pistons back, & the extra heat going into the water.
This 'simple' version wouldn't bother with a condenser; the weight & volume of the tank of water needed would be at least partially offset by a smaller fuel tank (because of increased efficiency) & lack of the condenser itself & its associated plumbing.
This idea may not appeal to Bruce Crower due to lack of any cams!
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