Evaluating the feasibility of a large displacement 750 RPM powerplant engine.
Wet cylinder liners - displacement
- bore =200 .. 220 mm
- the centrifugal-metalcasting shop specified max 270 mm outer dia for the cyl liner, preferrably max 260 mm if possible
- stroke=300..350 mm
- the centrifugal-metalcasting shop specified max 540 mm cylinder liner length
2 * 6 cylinders (or perhaps 2*4) per engine
Double roller
- connecting rods have 2 bearings, very hard to lubricate (and conrods stress the piston rings).
- horizontal twin-piston (align their pair) with double roller "swashplate" design (not wobble-plate!) is
- See ... video
Valves, valve-seat
- traditional
Preferrably compatible with an engine family (Caterpillar, Cummins, whatever...).
Any valve family where d > 48 mm ?
Camplate
1 camplate at each end of the engine
- with 4 fingers (different radius, of course) on each camplate
- odd cylinders: 1 finger for 2 intake valves + 1 finger for 2 exhaust valves
- even cylinders: 1 finger for 2 intake valves + 1 finger for 2 exhaust valves. Even cylinder fires 360+60 degrees after the neighbor odd cylinder. (for more even running)
- Using rockers (of different length) to actuate the lifters.
Lifters
Mechanical or hydraulic ?
Head
- traditional.
- 4 valves per cylinder + preferrably 2 sparkplugs per cyl
- Separate head for each cylinder
Oil pump
- electrical oil pump can be switched on before cranking.
- provision for chain-driven mechanical oil pump. One-way valves allow the 2 pumps to be connected in parallel
Coolant pump
- electrical coolant pump
- provision for chain-driven mechanical coolant pump. One-way valves allow the 2 pumps to be connected in parallel