Cat vs Powerstroke torque curves
I drew out what I expect the Powerstroke torque curve would look like relative to a Cat C11. I think it is very interesting how these curves reveal the different pulling characteristics of ...
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Nice graph, 4x4ord.
The automotive type diesels probably are tuned to save their flimsy clutches, auto-transmissions, rear axles and twisty noodle frames.
Under the heading, "other observations", the torque curve difference above also well illustrates the main difference between a gasser vs diesel. I had two 3/4ton Ford trucks simultaneously, a 2000 6.8L V-10 gasser and a 2000 7.3L diesel.
On hills, the low hp (235) diesel running at 65 mph (or about 1800 rpm), was already in it's high torque rpm band at overdrive during normal highway speed. Even left in Cruise Control, it seldom shifted out of overdrive to pull our travel trailer uphill. And running without Cruise, held at steady throttle, it never shifted out of overdrive on the moderate rolling hills of I-94 in ND and usually sacrificed less than 5 mph cresting.
The gasser, which has greater hp, (310) shifts down once, or even twice, on the same hills as the engine seeks it's high rpm torque band. Frequent shifting is only moderated slightly by manually holding a steady throttle. And, to save brutal tranny wear, it is best to lift-and-shift down ahead of time, under low throttle/torque conditions, prior to the hill.
The diesel has about 500 footpounds, the gasser about 450. Offhand, the diesel did about 2 to 3 mpg better... until some lady totaled it while parked in my driveway. Sigh.
Wes
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Nice graph, 4x4ord.
The automotive type diesels probably are tuned to save their flimsy clutches, auto-transmissions, rear axles and twisty noodle frames.
Under the heading, "other observations", the torque curve difference above also well illustrates the main difference between a gasser vs diesel. I had two 3/4ton Ford trucks simultaneously, a 2000 6.8L V-10 gasser and a 2000 7.3L diesel.
On hills, the low hp (235) diesel running at 65 mph (or about 1800 rpm), was already in it's high torque rpm band at overdrive during normal highway speed. Even left in Cruise Control, it seldom shifted out of overdrive to pull our travel trailer uphill. And running without Cruise, held at steady throttle, it never shifted out of overdrive on the moderate rolling hills of I-94 in ND and usually sacrificed less than 5 mph cresting.
The gasser, which has greater hp, (310) shifts down once, or even twice, on the same hills as the engine seeks it's high rpm torque band. Frequent shifting is only moderated slightly by manually holding a steady throttle. And, to save brutal tranny wear, it is best to lift-and-shift down ahead of time, under low throttle/torque conditions, prior to the hill.
The diesel has about 500 footpounds, the gasser about 450. Offhand, the diesel did about 2 to 3 mpg better... until some lady totaled it while parked in my driveway. Sigh.
Wes
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