Can someone help me figure this out?
According to the Cat web site, they recommend to speck axle ratios and tire sizes like this:
Cat C13, Multi-torque
80,000 lb GVW
430-hp, 1550/1750 lb-ft
1325 rpm @ 65 mph
Cat C15, Multi-Torque
80,000 lb GVW
435-hp, 1550/1750 lb-ft
1325 rpm @ 65 mph
So, basically both of these engines are OK for full truck loads and will run at the same rpm with the same horse power and same torque...
But why should someone pay more for Cat C15 (I assume it costs more money!) when C13 can do the job cheaper, and it weighs almost 800 lbs less? Both engines are designed to run 1,000,000 mi to overhaul and have 30,000 mi maintenance intervals.
Any ideas?
And another question: 2 fully loaded trucks run with the same load on the same road at the same speed, let's say 65 mph. One has a C13, another C15. Both have the same HP, same Torque, and turn at 1325 rpm at 65 mph... same axle ratios ...
Will fuel mileage be any different?
Thanks to everyone for input on this confusing topic