Take 50+ year old technology for best fuel economy- Hemisperical (or close to it) combustion chamber, dual spark plugs and dual spark source like 2 magnetoes, maybe direct fuel injection or leanable light throttle carberator. You can find examples in Pratt&Whitney 14 cylinder radials. BMW /5, /6 motorcycle engines had some dual plug upgrades when worried about unleaded gas here- claimed road mileage increased 5-10% under 90mph. Ford 140 inch 4 with dual ignition advertised about same mileage gain still with carb. Central spark plug, high energy ignition and port type fuel injection nowadays getting about the best compomise of fuel economy and performance. Cadillac has/had a 8stroke ignition cycle for light load running to get fuel economy and run cool- basicly fuel injector squirted only 1/2 the time. Lots of ways to get fuel economy known- but the marketable balance of power and performance may vary between Citroen 2CV and Ford Taurus when the 75 mile speed zones for 100 miles are considered. RN
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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