Posted by RN on August 23, 2012 at 09:43:20 from (205.213.104.118):
In Reply to: Re: k341 posted by Roger in Iowa on August 22, 2012 at 18:39:20:
Some 4 strokes fire every revolution. Simplified ignition systems that as noted are flywheel magneto or Magnapulse with flywheel trigger have a "wasted" spark cycle- but don"t need a camshaft access hole in block for points pushrod or end of camshaft sticking out side for points mount. Tecumseh vertical shaft small 4 stroke engines used on lawnmowers for a few years had the same ignition coil, flywheel trigger as their 2 strokes, common parts saved money. Some cars have "wasted" spark also - think the GM dual plug wire coil packs for pairs of cylinders, sensor triggers off crankshaft and one cylinder fires on power stroke but other paired cylinder is firing on end of exhaust. engine doesn"t have a distributor so parts situation with computer sort of simplified. RN
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