Just wanted to let everyone know who has the IXS Cummins series engines some tips. Most people who have alot of experence know these things but there might be some people here they might find this very helpful.
Most engines develope most of their power at 1650+ RPM. CATs love high RPM and hold very high torque at this level. Also causes high head pressure ( Cats usally run in the 55 to 65 range in oil pressures. )
This holds same with Detroits (50-60 PSI).
The ISX cummins are build a bit different they run very very low head pressure (30-35 PSI) and develope the most power at 1250 RPM.
The advantage to this is better fuel mileage while in a hard pull in high gears.
Examples: CATs love 18 speeds so while climbing a hill with a heavy load can keep their RPMs up therefore loosing little speed but at a cost of more fuel.
Cummins will bog down to 1400 to 1200 RPMs in a 10 speed and hold the same power and torque while also saving fuel.
Hope this helps some people out who have the ISX cummins engines.
Some quick facts about Cummins Engines
Discussion in 'Trucks [ Eighteen Wheelers ]' started by DiMeNsIoNs, Aug 4, 2008.
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The only thing I didn't like about the older CATs was they fell too quickly off the power-band so you couldn't mess around on the shift. It was "shift or get off the pot"
The old Detroits I drove were like my old Yamaha DT 250, you had to #### near run them out redlined to shift.
I haven't driven the new CATs yet so I don't know if that's changed. -
What I wish is that someone would actually know how to fix problems in an ISX, I have had trouble with one nearly all year, with it missing when the fuel gets hot, and those darn things return the fuel very hot to the tank. It's been to a shop,for this problem twice and it hasn't been fixed, they can't figure it out, they thought last it had bad o-rings in the head that the injector fits into. It still isn't fixed, now I'm running a Detroit 14 with a sticky EGR, the check engine light is on but it runs.
The ISX won't run decent more than about 40 minutes then it starts sputtering and missing, it will stall at idle(800rpm), with still no code to read.
The company is in a bind,not spending the money to do anything right, but I do like the job I have, meanwhile, I can't find out anything about the darned ISX, the ECM trips but won't show a code, sometimes even when hooked to a computer. Of the 4 they have there is now 1 left running.
There is no coolant anywhere it shouldn't be , no fuel where it shouldn't be and no oil where it shouldn't be. The darned thing should be repairable, but isn't
:smt102
:smt017.
It does pull really well when at low revvs, better than anything else I have driven, which is a good thing considering the first 4 months I drove it, it didn't have 9th gear, or 4th for that matter. I really must like this job. Now it has a remanufactured transmission that took 2 months to break in but the motor won't run right. BTW we are legal to 86 K in Iowa, and it's often loaded up to that point. I drove it and got there and back, heavy or not
Is there anyone that has enough experience to solve this mechanical mystery? I'm thinking its' something simple, that is being overlooked. -
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