When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
OtherEverything else not covered in the main topics goes here. Please avoid brand and flame wars. Don't try and up your post count. It won't work in here.
I created this chart to help better visualize how this works. Engine one is 400 ft lbs at 1600 rpms. Engine 2 is 250 ft lbs at 3000 rpms. Both have the same transmission so the gears are the same. Both have different rear end ratios so that each will be making peak torque at 62 mph.
143 Engine Horsepower gets the job done faster than 122 hp. Which one would be more pleasant to drive? The 1600 rpm one for sure!
I think the biggest thing here is are you going to idle as you let the clutch out and slowly roll into the throttle or rev up to 3 grand and let the clutch out.
Ether way will get the job done for a while but idling off the line will do less damage and the truck will last longer.
Ill take lower HP and higher torque every time.
had an old 91 model with a 160 HP don't remember what the torque was but could load it down with a farm load that probably should not have been behind this 2018 3500 with a 400 plus HP motor . and it never had a problem moving it. It was torque that made it move not HP although as you stated with the 40 HP tractor sometimes it was slow.
Diesels have more rotational inertia than gas engines so that plays a role in the low end grunt when the clutch is let out. I think the governors in the mechanical injection pumps try to hold rpm at idle as well. Older gasser did not.
160 HP at 2800 and 400 ftlbs at 1600. A bit anemic compared to the latest version. Computers have made both gas and diesels powerful and efficient.
More fun! I like learning about this stuff. I am not going into the details of how I calculated rolling resistance and wind drag. That kind of math is over my head and took a bit of time to figure it out! This does not account for drivetrain losses.
Now how much force does it take to maintain a set speed on level ground?
1st Gen Cummins with 10,000 pounds rolling on flat ground at 55mph will need 224 pounds of constant force to maintain this speed with 32 horsepower.
Let’s speed up to 65 mph now we need 266 pounds of constant force to maintain this speed with 46 horsepower.
Now we are climbing a 5 % grade. The 1st gen is not going to climb it at 65 mph because it now needs 1137 pounds of constant force to maintain this speed with 197 horsepower. We are rated at 160HP.
We will only be able to maintain 54 mph up this grade. We need 1095 pounds of constant force to maintain 55 mph with 158 horsepower.
Also if you slow down and try to gain your speed back on this grade it will be difficult. If you slow down to 40 and try to get back up to 50 it will take 2.25 minutes to accelerate to 50 at full power of 160 hp. You will not be able to get back to 55mph.
I think Ford owned a small share of Cummins ( no G) a few years back but no longer has it.
Yeah, that's an old joke around here, anytime Cummins's get compared to Ford's junk...."Ford owns CumminGs" always used to get some interesting comments
Most don't know doo about stuff on the interwebs. Many think shocks add lift and huge hp gains can be had by removing the stock airbox and adding a 4" exhaust.......
05-06-2018, 09:47 PM
Computers have made both gas and diesels powerful and efficient.
I am not going into the details of how I calculated rolling resistance and wind drag. That kind of math is over my head and took a bit of time to figure it out! This does not account for drivetrain losses.
