Cummins ISM HP Question

I haven't seen an electronic engine yet that can't be turned up. I don't know a lot about Cummins but I'm pretty sure they were availible from the factory with 500hp, 1550tq. Aftermarket programing can surely go higher than that.

 

In my opinion there is no substitute for cubic inches in heavy haul. Typically they have a longer stroke which creates more torque just like a longer lug wrench. You can turn them up increasing HP and torque but when you get down to the hard pull it still lacks the mechanical advantage. Eights compaired to sixs is a little different subject.
Their are about 61 cubic incles to a liter. ISM is a later model of the M11, aprox 671 CID. I believe the ISX replaced the N14 and NTC with 14 liters or about 855 CID.
I do not thank thats what you want unless maybe you are a flatlander.

 

my truck isn't a cummins but its a 12L 460hp with a 13 speed it runs strong for its rating, and it works good for me, its comfortable at 100k-105k like your hauling but i think if i was to buy another truck it would have a bigger displacement engine for better low rpm grunt and better engine braking.

i would verify with Cummings or Pete that that engine s/n can be turned up to at least 450 if not 500hp and 1650 tq before i would put a dime on it. 370hp although you will still get from point a/b your be wishing you had more power.

 

500hp for rv use, 410 to 425hp for over the road

 

Ha Ez: Glad you you got that dog back on the road with a reasonable time charge and did not have to pull any heads. I am going to talk a minute aboute your 12L being comfy at 100k, torque, stroke and horse power.
1: Seeing is beleiving: I had a G John Deere and thank it was 36HP @ 1875 RPM. It was a 413 CID two cylinder with a 6 1/4 inch bore with a 7 inch stroke. My neighbor had a pretty simular styled A. I caught him running a round baler with it when his AC 190 broke down. I thought you said that baler requires a minium of 55 HP and you are no where close. He explained that long term dependable power is in the torque related to the stroke just like a longer wrench. Just had to slow down a bit.
2: Your Mack catches the best of both worlds. At 12L it has a 6.5 in stroke like the big bore engines but weighs a lot less.
3: Stroke on a C15 is 6.75, D 12.7 is 6.3, D 14L is 6.61, ISX 14.9L is 6.65 for compairison.
4:The ISM is the updated version of the M11 which is actually a stroked L10. I looked it up and it is actually a 10.8 L, 659 CID with a 5.787 stroke. I have one and like it but never gross 60,000.
5: Lots of poeple yell HP. If you pick up the correct 4WD mag many people can be found with daily driver pickups on a chassis dyno. I was amazed how many were turning 600- 1000 HP that drove long distances to watch truck pull or mud bogg. They come in all brands but I do not thank any of them will are up to 100,000 Lbs day in and day out

 

great piece of info there boxcarkidd

i know tons of people claim that mack under rated there engines, and its strange to me that the engine i have was considered macks big engine of the time, with the only one with more power being the 460xt witch is supposed to be 500hp 1850tq on the same engine platform. the cl was the only Mack you could get a bigger displacement vendor engine in.

i don't think they so much under rated there engines, as they just rated them at a rpm that is actually usable. most engine manufactures rate there engines at 2000+ rpms Mack was rated for peek hp at 1800, being that hp is a calculation of tq-rpm you might not ever see peek horsepower on a isx. i don't have the numbers in front of me right at the moment but i seem to remember peek hp being made pretty much all the way from 1600-1800 rpm it would be interesting to overlay a dyno chart from say a 450hp isx and a e-7 460, i would be willing to guess the isx would win from 1100-1350 but i think from the 12l mack might actually out pump the 14L of the same rating from 1350-1800

the tq is what moves mountains though and displacement makes tq i guess i don't know why but my truck will normally walk away from 14L engines that are in the 450-475 hp ranges loaded at equal weight. 550 cats i can hang with on a short pull, but once you have to start dropping a few gears they will normally walk away from me unless the driver misses a gear or something.

the 1000hp pickup trucks would never pull a 100,k lb load very far without blowing up, reason being all the components are way to small. you would have a duty cycle of maybe 12 seconds before things started flying apart,

 

Just like these kids with the ricer cars. Yeah sure your little VTEC 1.8L makes 600hp but lets hitch a 7,500 lb trailer on and see how it compares to my big, 385hp V8.