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[QUOTE]Originally posted by cajun: [QB] <snicker> Hee Hee Hee! It's 1:17 AM and the Unemployed Engineer can't sleep! Ooh, questions that test Engineer's knowledge, eh? Hrmm. Copper BB's in Differential to reduce noise: Eh, no. Won't work. Try bananas, including the peel. Thickens the gear oil enough to reduce the noise. (Trick from mechanics Down Under...) 45MPH truck, how many cfm of air are you using in 1,000 km: Depends, are you asking how many cubic feet per minute of air the carb is ingesting at that speed or are you asking how much air in total is ingested for that 1,000 km? (An African or European Swallow?) IIRC, we're talking about a Suzuki Samurai. 1600cc engine. Assume 31" tires, 4.11 gears, 1.23:1 high range transfer, 4th gear (1:1). 45mph=72.42kmh=1.21kmm=1220mm. 31"tall=.79mtall=2.47mcircumference. =>493.19 tire rpm=2493 engine rpm. Say engine working at 50%volumetric efficiency (50% throttle...) =>997200cubic centimeters/min=35.22cfm So answer one would be 35.22 cfm at 45mph given the above assumptions. Answer two would be 29,107 cubic feet of air. Explain how a divergent duct affects air flow and pressure: Divergent duct = diffuser. Diffuser would cause a reduction in air velocity and an increase in pressure. Any other questions? Got my textbooks and references handy... -Will [/QB][/QUOTE]
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