Kinsler_Handbook_#32 December 2017

201 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. www.Kinsler.com Phone (248) 362-1145 Fax (248) 362-1032 Kinsler Fuel Injection, Inc, FUEL DATA Example of use : A popularly accepted rule of thumb is that of the total heating value of gasoline, only about 1/3 goes down the drive shaft as work, as about 1/3 goes out of the radiator as heat and about 1/3 goes out of the exhaust pipes as heat and blow-down pressure. Lets look at a 331 cubic inch small 648 hp @ 7800 rpm with .46 BSFC (Brake Specific Fuel Consumption) block professional road race engine: 470 ft-lb @ 6750 rpm with .42 BSFC Looking at our conversion chart, we know that one horsepower = 42.44 Btu Torque From the conversion chart, hp = torque (ft-lb) x rpm = 470 x 6750 = 604 hp 5252 5252 604 hp x 42.44 Btu/min per hp = 25,634 Btu/min work done by the engine From the conversion chart, BSFC = lb/hr fuel so lb/hr = BSFC x obs hp = .42 x 604 = 254 lb/hr observed hp 254 lb/hr = 4.233 lb/min gasoline 4.233 lb/min gas x 18,400 Btu/lb gas = 77,887 Btu/min heat value in the gasoline burned Efficiency = 25,634 = 33% 77,887 Horsepower 648 hp x .46 BSFC = 298 lb/hr gas = 4.968 lb/min 4.968 lb/min x 18,400 Btu/lb = 91,411 Btu/min heat value 648 hp x .4244 Btu/min per hp = 27,501 Btu/min work done by engine Efficiency = 27,501 = 30% 91,411 NOTE It makes sense that the engine is less efficient at the horsepower peak than the torque peak, as the air pumping losses through the intake ports are higher at the horsepower peak. Note : water is 8.3 pounds per gallon. © 2017 Air/Fuel Ratio Latent heat of Mixture temp. Density Weight lb/gal Heating Value for complete evaporation drop due to sp. gr. at 60 o F at 60 o F Btu/lb - ** combustion Btu/lb - ** latent heat, o F - ** Gasoline .690 aviation 6.17 for 20,000 14.7 148 35 .751 most pump .740 sp. gr. [ avg of (6) major brands ] .690 - .740 typical race Methanol .792 with no 6.60 8,600 6.5 500 250 water present (anhydrous) Nitromethane 1.139 9.50 4,500 1.6 135 ? (100%) ** - These are approximate values, especially the latent heat and mixture temperature drop. Earl Wooden’s Land Speed “1947 Crosley”, set several land speed records when equipped with a Kinsler small block Chev- rolet, and now powered by a big block G.M./D.R.C.E.2 engine at the World Finals at Bonneville set the world record for a flying mile with a average of 292.288 M.P.H. Jerry Helwig’s Land Speed 1940 Ford Coupe powered by Kinsler injected flat head Ford, runs in XF/VGC on gasoline and XF/VFC with alcohol/nitromethance mixture

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