Maybe look at a Brazilion engine? Ford and GM old iron block and head designs from late 60s hot rod days were used initially for the Brazil ethanol tests, production engine were similar- the old Pontiac 200 inch slant 4 was used in mid sized GM bodies, the variation of inline 4 2.5 also in smaller bodies. Ford had something derived from old 312/332 block and the 140 inch 4. Iron used instead of aluminum, teflon or Kelvar instead of rubber/nylon hoses and seals, 2 fuel tanks-1 gasoline, 1 ethanol, ethanol preheater/heat exchanger from engine hot water before Ethanol line went into carburetor. 11,12/1 compression ratios and wide advance ignition systems. When warmed up and running ethanol were little hotrods. Ford(?) had a variable compression blower experiment- drive was a variable speed belt drive like snowmobiles used coupled to a rotary vane positive displacement supercharger- low ratio gave in effect about a 8/1 compression ratio, the high speed on drive gave effective 11/1 compression ratio and was used with the ethanol- a blend of fuel could be used with belt pulleys set to midrange, also belt ratio dropped when knock sensor had pings. Honda 125 motorcycle was featured in Cycle Guide(?) few years back- Iron used in head, other changes for ethanol like cars- Another little hot rod getting real good mileage. RN
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