06Fargo wrote:
Hannibal wrote:
06Fargo wrote:
RCMAN46 wrote:
06Fargo wrote:
So why don't trucking companies use a couple light weight Eco motors:
remove 1 big heavy expensive oil change diesel that makes 450hp & 1650lb-ft of torque that doesn't matter...
replace with 2 x 365HP Eco's that would make 730hp, but still deliver 420lbs-ft of torque down the drive line... but that doesn't matter - so this arrangement will "smoke" the big lazy 15 litre ISX ...
right?
Right the 730 hp gas setup with definitely smoke the 450 hp diesel.
Now longevity may be a different issue. But while the gas is healthy and producing 730 hp it will be a no contest.
Two 365 hp Ecos will have 840 ft lbs of torque. In first gear the Ecos can put about 6200 ft lbs of torque down the driveline with an Aisin 6 speed transmission.
How can 2 x 420 lbs ft torque engines develop 840 lbs ft of torque at their crankshafts?
Double the power yes but show me the math how they can increase torque beyond their capability at the crankshaft by being connected together.
Two engines turning a common shaft can only double power if torque is doubled.
:)thanks Hannibal...
so if I am able to turn a shaft with a 3 ft bar at a certain rpm with 300lbs-ft of torque but then resistance increases and I begin to slow down, but I am still applying 300 lbs-ft., but then you put your 300lbs-ft to work opposite me on the same shaft with your 3 ft bar, and we are able to increase the rpm more, are we applying 600 to the shaft? Or are we able to overcome added resistance on the shaft ( a hill ) and turn it faster at a steady 300lbs ft thereby producing more power but not more torque?
Not sure I worded that right :h
If we're both applying 300ft/lbs of torque to the shaft, we will be producing 600ft/lbs of torque to the shaft. At whatever rpm we are turning the shaft, horsepower will be double what it would be if only one of us is applying 300ft/lbs of torque to the shaft.
Think of the Cummins flat torque curve. If it produces 800ft/lbs of torque at 1600rpm, it will make 244hp. If you run that same engine at 3200rpm at the same road speed, if it still produces it's 800ft/lbs of flywheel torque at that rpm, it will be making 487hp and through 2:1 ratio gear reduction, will be producing 1600ft/lbs of torque to the output shaft of the gear reduction unit. This is how higher horsepower from the same flywheel torque output produces more torque to the drive wheels and gets you up the grade faster.
