parkland -- love that binary sig quote.

 

To answer your question YES you can get them in a lot of different HP ratings. But if you note, the cummins ratings showed one basic hp number and a range on the torque. Only reason I looked up the cummins was I was pretty sure the ISM wasn't rated to 435 and was actually the M11.

But your correct on being able to get different ratings. Example last truck I bought for myself was a 95KW with a 12.7 series 60 detroit. When I bought it they had it set at 430hp, I had it changed to 470 with a program change. the truck before was a 450hp which even though the engine was the same, the injectors and ecm where different so on that particular one it was as high as it could be set. Local grocery store chain was also running 12.7s at that time and they had them all set to 370hp. with a turbo change I could have set mine to 500ho. so as you can see yes you can get them in a wide range.

As to the questions about hp at rpm posted Above I didn't bother back check it was just trying to figure out where 89F2urd was coming up with his numbers so did some googling until I found those exact figures and came up with this site

Cummins Diesel Engines

Here is the actual cummins page for the ism

Cummins Every Time - On-Highway - Heavy-Duty Truck - EPA 07 ISM

As you can see the ism is rated 280 up to 425 but doesn't give a rpm. The rpm of max hp would be dependent on which tq rating you choose (which is what your actually looking for when going to the ratings.) which on this particular engine is 1150 - 1550 but always rated at 1200rpm. That is why the sweetspot for fuel economy is around 1200

 

It wasn't just chipped it was worked over heavily. John was right on the 600hp being the highest rating. Has to do with teh transmissions. Non of the highway truck transmissions are rated for over 1850ft/lbs (cat actually had to turn their 600s torque ratings down because Eaton was refusing to warrenty the 18spd behind it)

In the caase your talking about it was probably a modified N14. Those were pumped up a lot, I know of several guys that had them turned to as high as 900hp, but you had to be very careful or you were breaking transmissions input shafts all the time. 7mpg is pretty dang good, must of the ones I knew of only averaged around 4, and the truck I am driving now is a 2012 and suprisingly is getting better fuel economy then the 07 I just turned back to the company. Averaging right now is 6.8 and on a good day being careful can get 7.4 according to the dash readout which when have checked it a couple times seems to be pretty accurate on this truck.

 

And with the 600HP motors, the programming is such that you don't have all those ponies available in the lower gears. Reason being as Rob said. In low gear you could break the input shaft if you were under a load and you had your foot in it hard.

 

Semi toy hauler?

 

An old cabover western star with a 450 CAT.

He was going to try to find a 500 HP CAT or Cummins, but once I told him how good the v10 is he ran out and ordered one right away.

 

I have always wondered why trucks here haven't been rated over 600hp. I guessed that the conditions for trucking here didn't warrant it, I didn't realize Eaton limited it.

I know back home 700hp isn't uncommon, in fact I think almost all OEM's offer that, though most engines are V8's too. I know Scania offers 730hp (2600lb ft @ 1000rpm ) off the shelf - there may be higher power ones. A lot of guys run off-highway Cat V8's pushing 800+


We only ran 3 trailer trucks, with Cat 3408's in both, tuned up to ~650hp if I recall (Kenworth T904's). 3.5 mpg fully loaded @ 180,000 pounds. Some of the larger trucks run 2 engines. A big Cummins in the tractor at the front, and a ~400hp pusher motor in the rear trailer with a common throttle linkage.

 

Those 3408s I believe will do 100HP per hole. So will the V-8 Mack motors. Those were simple to turn up too from what I have been told. A simple adjustment screw on the fuel pump. That's what I have been told.

 

Yea i botched up the reading of the chart big time. . . .and realized it earlier today when i thought about the numbers. . . I don't know why it has to be an attack on my credibility. . . .its obvious the information is available to anyone to check. It was an honest and idiotic mistake on my part. . . The motor i was citing is a 14.8l platform that has 190 hp at idle and shoots up to just shy of 350 hp at 1,000 rpm. From then on to redline (21-2400) its 400 hp to this particular motors 550hp peak.

Believe me i've been beatin myself up over this all day, i havnt been around a computer and am usin my phone here to fess up to it.

I understand the math relationship hp=tqxrpm/5252. . .and have proven that i understand the physics many times. I made a rookie mistake that everyone makes from time to time, i certainly accept criticism but not attacks on my credibility. Im not tryin to make up info, i cited info from a chart as if id never done it before. My point remains valid that the big cube high torque motors shoot to near peak hp fr most.of.their operating range.

 

You're still higher on the totem pole than those 6.0 guys.

 

I know they must of been simple, our mechanic did it, and he was as stupid as the day was wide.

He swore by the motors though - 600k miles between overhauls, and usually 5 rebuilds on a motor before you would be junking it.
It was a little better than people running Cummins at the time... let alone those running the "signature" series. Kind of aptly named, because thats what the operators had to keep putting on their check book.
I do know that the guys running the Mack's were very happy too.
Not even the diesel guys stick up for you


It's disappointment - head bolts aside, its a decent platform.

 

FWIW this is what my 07 weighed with I think 3/4 tank of fuel, the grill guard and some random crap in the bed.

7,740lbs

 

My 2000 weighed in at ~7400 (IIRC), PSD/stick/SC LB/4x4/half a tank of diesel.


DMV accidentally typed it in as 3500lbs (cheap registration )

 

It's amazing what wet sleeves can do for a block's longevity

 

Yes. Not to mention the ability to do an in-frame rebuild, kind of handy when the engine weighs around 4000lbs.

Need to make sure you use the right coolant and run coolant filters though to prevent cavitation.