What gear to you 'cruise' in?
Rotary Enthusiast
Joined: Jan 2003
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From: fl
Originally posted by WAYNE88N/A
torque and horsepower meet at 5250 rpms, on every gasoline internal combustion engine built by man, according to something I read a long time ago by a guy a lot smarter than me who proved this through mathematics...I think the reason has to do with the dynamics of the engine itself- the rotors are basically acting like a flywheel (they don't have to change directions like a piston)...simple physics dictates that the more momentum a flywheel- type object has, the more inherent energy it has...that, and the aerodynamics of the body don't produce appreciable increases in drag with moderate speed increases on the freeway, until what, maybe 90-95 mph?
torque and horsepower meet at 5250 rpms, on every gasoline internal combustion engine built by man, according to something I read a long time ago by a guy a lot smarter than me who proved this through mathematics...I think the reason has to do with the dynamics of the engine itself- the rotors are basically acting like a flywheel (they don't have to change directions like a piston)...simple physics dictates that the more momentum a flywheel- type object has, the more inherent energy it has...that, and the aerodynamics of the body don't produce appreciable increases in drag with moderate speed increases on the freeway, until what, maybe 90-95 mph?
um close. its not some universal law of engine mechanics, its simply the fact that power is a product of tourque and rpm, and the conversion factors from ft-lbs to horse power lead to tourgue always being identical to HP at 5200 rpm. its not the phyiscs, its the math.
speaking of phsics, i remember hearing somewhere that any IC is more efficient when under wider throtle (this kinda makes sence because less energy will be lost sucking air over partialy closed butterflys) which explains why wider throtle at lower rpm will be more effecient than less throtle at higher rpms in a lower gear for the same speed. ofcoarse this has limits, but im pretty sure it can be taken as a pretty general rule for normal conditions.
Jesus is the Messiah
Joined: May 2003
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From: Silver Spring, MD
Originally posted by andrew lohaus
wider throtle at lower rpm will be more effecient than less throtle at higher rpms
wider throtle at lower rpm will be more effecient than less throtle at higher rpms
Cuz I'm pretty sure being WOT in 5th doing 30 up a hill is gonna take way more gas then the less throttle in 3rd going up the same hill at a much higher RPM (Also 30MPH, both senarios not accelerating).
I cant see where that would intersect for that explination. Could you please explain? It would definitely help me drive for better fuel economy
Last edited by Tofuball; May 18, 2004 at 07:08 PM.
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