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Summary of change:
Evaluating the feasibility of a '''large displacement 750 RPM powerplant engine'''. Naturally aspirated, CR=16.5 for producer-gas (appr 50..55 Nm / liter of displacement equivalent to 4300 Watt on shaft, 4kWe on generator). Gensets with similar engines usually achieve 50-80 kWe / ton of weight (the more common configuration is 1500 RPM engines with traditional crankshaft and connection-rods). ---- '''Wet cylinder liners''' - displacement * bore = appr. 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 ** ~ 13.3 liter / cylinder 2 * 6 cylinders (160 liter total, appr 640 kWe). 2*4 (106 liter) would be another option. ---- '''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 Rollers are 110..160 kN radial force depending on bore. (bearing for this is appr 150 mm OD, and 3kg) '''See''' * http://www.eleg.hu/tiki/tiki-index.php?page=Axi%C3%A1lDugatty%C3%BAsMotor * See 40 sec in [http://www.youtube.com/user/EICADXB#p/u/1/sVEOTNjAtCU video] in this kinder engine ** note the rollers, and the oil-grooves in the twin-piston ---- '''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 ? * any suggestions for hydraulic lifters ? ---- '''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
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