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Old 07-14-2008, 02:43 PM   #30 (permalink)
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Join Date: Jun 2008
Location: trumansburg NY
Posts: 162

sputnik - '93 oldsmobile silhouette
90 day: 23.23 mpg (US)

home sweet home - '92 ford clubwagon E-350 xlt

very excelant - '92 honda civic vx
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Originally Posted by aerohead View Post
---------- for spark-ignited gasoline engines,best BSFC occurs at point of maximum charge loading efficiency,which is basically where torque peaks,which is at about 80% load.At light load,or full load,efficiency suffers.---------
so if 80% load at ~1700 rpm is 50 hp, that is only the most effecient engine speed if you need 50 hp. most of our cars might only need 15 hp to cruise down the road at 55mph.
if we change the gearing so that 15 hp is closer to 80% load, maybe down around 1000 rpm. the engine will still be more effecient even though piston speed is less than ideal.

a manual cvt and a scan guage setup would be really interesting to see
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