www.zodiac.nl 27-001 TECH-TIPS Torque Foot pound to Newton meter: ft·lbs x 1.356 Newton meter to Foot pound: Nm x 0.737 Torque = Horsepower x 5252 RPM Example: Harley-Davidson has rated the Evolution motor at 69 horsepower at 5000 RPM. What is the torque? Torque = 69 x 5252 = 72.5 5000 1 Horsepower = 550 foot/pound per second = 76.04 kg/mtr per second 1 Horsepower = 0.736 Kilowatt 1 Kilowatt = 1.36 Horsepower Horsepower = Torque x RPM 5252 Example: Harley-Davidson has rated the Evolution motor at 82 ft·lbs of torque at 3600 rpm. What is the Horsepower? Horsepower = 82 x 3600 = 56.2 5252 Engine Displacement: Bore x Bore x Stroke x 0.7857 x number of cylinders Example: Stock Big Twin Evolution Engine has 3.5” bore and 4.25” stroke Bore x Bore x Stroke x .7857 x 2 cylinders 3.5” x 3.5” x 4.25” x .7857 x 2 = 81.81 Cubic inches in Cubic Centimeter: Bore 3.5” = (3.5 x 2.54) 8.89 cm Stroke 4.25” = (4.25 x 2.54) 10.798 cm 8.89 x 8.89 x 10.798 x 0.7857 x 2 = 1341.01 cc Compression ratio Displacement + Combustion chamber volume : 1 Combustion chamber volume Example: for stock Evolution Big Twin Engine Measured combustion chamber volume 83.8 cc Displacement (1 cylinder) 670.5 cc 670.5 cc + 83.8 cc : 1 = 754.3 : 1 = 9 : 1 83.8 83.8 Harley-Davidson and S&S V-Twin bore, stroke and displacement Bore, stroke and displacement is listed as Harley or S&S has indicated them. For the purists: In most instances the formula to calculate displacement for 2 cylinders (V=πr2h * 2) gives something different, but close. A 80CI Evolution Big Twin, for example, has a real displacement of 81.751CI or 1,339.66cc) Displacement Engine Bore Stroke 45CI 750cc K, WL & G models 2 3/4” 3 13/16” 46CI 750cc XG Street 3.350” 2.600” 54CI 883cc XL Sportster 3” 3 13/16” 54CI 900cc XL Sportster 3” 3 13/16” 55CI 888cc KH models 2 3/4” 4 9/16” 61CI 1,000cc XL Sportster 3 3/16” 3 13/16” 74CI 1,100cc XL Sportster 3.350” 3 13/16” 74CI 1,200cc XL Sportster 3 1/2” 3 13/16” 69CI 1,130cc 2002-2007 V-Rod 3 15/16” 2.835” 76CI 1,250cc 2008-2017 V-Rod 4.134” 2.835” 100CI 1,647cc S&S X100 4” 4” Big Twin Displacement Engine Bore Stroke 61CI 1,000cc 1936-1947 Knucklehead 3 5/16” 3 1/2” 74CI 1,200cc 1930-1948 Flathead 3 5/16” 4 9/32” 74CI 1,200cc 1948-1965 Panhead 3 7/16” 3 31/32” 74CI 1,200cc 1966-1977 Shovelhead 3 7/16” 3 11/32” 80CI 1,300cc 1940-1948 Flathead 3 27/64” 4 9/32” 80CI 1,340cc 1978-1984 Shovelhead 3 1/2” 4 1/4” 80CI 1,340cc 1984-2000 Evolution 3 1/2” 4 1/4” 93CI 1,530cc S&S KN93, P93, SH93 3 5/8” 4 1/2” 96CI 1,575cc S&S V96 3 5/8” 4 5/8” 103CI 1,691cc S&S P103, SH103 3 5/8” 5” 107CI 1,754cc S&S V107 4” 4 1/4” 111CI 1,807cc S&S V111 4 1/8” 4 1/8” 113CI 1,852cc S&S V113 4” 4 5/8” 124CI 2,035cc S&S V124 4 1/8” 4 5/8” Twin Cam Displacement Engine Bore Stroke 88CI 1,450cc 1999-2006 3 3/4” 4” 95CI 1.557cc 2000-2004 3 7/8” 4” 96CI 1,573cc 2007-2017 3 3/4” 4 3/8” 103CI 1,690cc 2005-2017 3 7/8” 4 3/8” 110CI 1,803cc 2003-2017 4” 4 3/8” 111CI 1,807cc S&S T111 4 1/8” 4 1/8” 120CI 1,967cc 2011-2017 120R 4 1/16” 4 5/8” 124CI 2,026cc S&S T124 4 1/8” 4 5/8” 143CI 2,231cc S&S T143 4.425” 4 5/8” Milwaukee Eight Displacement Engine Bore Stroke 107CI 1,753cc 2017-up 3 15/16” 4 3/8” 114CI 1,868cc 2017-up 4 1/64” 4 1/2” 117CI 1,917cc 2018-up 4 5/64” 4 1/2” 124CI 2,035cc 107CI with S&S BigBore kit 4 1/4” 4 3/8” 128CI 2,100cc 114 or 117 with S&S BigBore kit 4 1/4” 4 1/2” (Site 1417)
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