Comments by "Bo McGillacutty" (@Mrbfgray) on "Rolls Royce Crecy - The Most Advanced Piston Aero Engine Never Made." video.

  1. Fantastic dive into sleeve engine!
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  2. I first became tad enamored with a 2-stroke engine when introduced on the job to Detroit 4-valve, 2 stroke industrial diesels. Back in the 1980's they were competitive and sounded great with that 'doubling of RPM' sound effect, popping twice as often....it was a scraper, still basic dirt collecting/transferring machine on many earth moving jobs but the 2 stroke is long gone.
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  3.  @sandervanderkammen9230  Thanks. Didn't know that. I'm a nerd for any clever machine designs that actually worked and maybe new to me. (have Mech. Engineering background, but that is about how to apply math and physics to predict efficiencies, stresses and strains, theoretical limits and so on, it's NOT about existing tech or history)
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  4.  @sandervanderkammen9230  On the surface--a few potential drawbacks: a LOT of sliding contact area friction and very high "oscillating" mass compared to standard valve/push rod competitor. The sleeve will have to have tight tolerances but will still leak a little, surely adding to piston ring blow by to crankcase. Cylinder side breathing seems inherently inferior to top intake/exhaust (how do you flush the top of stroke?) except for the increased opening size significant advantage.
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