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  1. #1
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    Cummins ISC Engine

    Am thinking of going with a Cummins ISC 300 on my next truck (D-Unit, FL70 frame). Heck, the 15,000 oil drain interval alone makes it an easy choice over my CAT 3126-B (8,000 drain recommendation).

    You Cummins owners/drivers out there, any words of advice, horror stories, things to look out for, spec-ing advice, etc.?

    I know there were some major problems with fuel lines and fuel pumps in '98, but have been told (and you all know how that goes) that those problems have all been fixed. What say ye???

    Thanks for your time and advice...

    Rams Fan

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  3. 1,171353,20775,8
  4. #2
    guest
    Guest

    Cummins ISC Engine -- Comments Please

    I have a isc 285. they replaced some lines on the back of the fuel pump the day after i got it. Said it was a recall. Only other problem I have had on engine was a leaking fuel line on # 1 cylinder, and the elec. lift pump started leaking. got both fixed under warrenty and all has been ok since then. There is 114500 mi. on it and I get just over 10 mpg.

  5. 2,171354,20775,8
  6. #3
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    i just to have a truck with the 5.9 cummings now i have a 250 cat and much hapier with it thx.

  7. 3,171355,20775,8
  8. #4
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    Have you considered converting a class 8 tractor? I have a 96 volvo, recomended pm is 22k, i do it at 15 to 18k. You spend less monet and gat a motor that will last well over a million miles and get ALOT more room and comfort. My fuel milage is running 8.5 to 9, and i can carry 26k if needed, this has gotten me out of "dead areas" hauling ltl for LEA sister co. more than once. If you need more info contact me Doodle LEA unit4862.. See my truck in cool trucks on this website

  9. 4,171356,20775,8
  10. #5
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    What is your cruise RPM, axle ratio and tire size? 10 MPG seems pretty good!

    I've heard and read 1650 RPM is the best mix for power and economy in the ISC (optimal cruise RPM). You agree? Recommendation is to lug it down to 1350 to 1300 RPM before grabbing a gear when pulling a grade for best economy (max torque @ 1300). Your thoughts on the ISC's torque curve and shift points?

    Do you feel you'd get better or worse milage with the higher HP 300 or 315 model?

    Thanks!

    Rams Fan

  11. 5,171357,20775,8
  12. #6
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    I have a c series 225 HP engine,have 360000 miles on it and have gone thru 2 fuel pumps,one totally replaced under warranty (they claim it costs $4700) and that one also went out after 100,000 miles so they gave the pump under warranty but did charge about $900 for labor.other then that they seem to be ok.I get 11.5 mpg at about 62-3 mph.

  13. 6,171358,20775,8
  14. #7
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    Rich,

    Anything over 11 MPG shows you are a very good/smart driver!

    Thanks for the reply.

  15. 7,171359,20775,8
  16. #8
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    axle ratio is 3.21. tires are 22.5. Your rpm suggestions are right about where I run it. Pulls hills real nice. I have been all over Caliifornia and the rest of the western states and had no trouble on the hills.

  17. 8,171360,20775,8
  18. #9
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    FYI...The ISC 300 and 315 are the same..one is advertised HP the other peak HP. Some dealers use the higher # for advertising purposes. I'd recommend a Super 10 or trans with a .74 OD and a 3.90 rear end. Great for cruising and good mileage.

  19. 9,171361,20775,8
  20. #10
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    Krooser,

    Thanks! I was debating between the 3.90 and the 3.70. Considering the torque curve on the engine, the fact that as a D-Unit my average freight weight is usually only about 5-6,000 lbs (rarely over 10k) and that I'm empty/deadhead about 33% of the time, I figured to improve my overall MPG even further with the 3.70 rear-end. I am hoping, however, that the taller ratio can be supported under load by the an ISC at 300 HP (which, I believe it can).

    Your thoughts?

    Mr. M

  21. 10,171362,20775,8
  22. #11
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    I have a 99 kw with a 300 and 10 speed eaton-fuller and I
    havent seen a cat yet that can run up mountains with me.

  23. 11,171363,20775,8
  24. #12
    guest
    Guest

    RE: Cummins ISC Engine -- Comments Please

    We're driving a 99 FL 70 w/ 300 HP ISC coupled to 10 spd Eaton Auto shift. Do P.M.'s every 10-11k. Get 10 - 11.5 MPG. Unsure of axle ratio. Using 22.5 lo-pros. Truck now has over 130 k miles with not a single problem with drivetrain. Never need to downshift until over 8k lbs and in excess of 7-8% grade, then only one gear. We can run 70 MPH on any interstate hill east of the Miss. in top gear up to 10k load. With engine brake, you never touch the service brakes, either. Would highly recommend this engine.

  25. 12,171364,20775,8
  26. #13
    Junior Member
    Join Date
    Jan 2010
    Posts
    14

    Re: Cummins ISC Engine

    10 year old thread and i want to revive it in hopes somebody will find it beneficial.

    Truck:
    -2001 Kenworth T300 26 ft box

    Engine:
    -cummins ISC 260.

    Transmission:
    -eaton fuller 6 speed with .78(?) O.D.

    Rear end:
    -4.33 rear end.

    Fuel additive:
    -dipetane

    Tires (new):
    -bridgestone M720 (drive)

    aerodynamics:
    -nosecone
    -airtabs
    -low profile box (u.s. mail)


    @ 62-65mph (no cruise control.. yet) i get 12.55 mpg minimum. with new air filter installed today i expect to get close to 13mpg at those speeds. well see in a few days..

    250 miles empty and 250 miles with about 3k lbs. (i dont think weight has much effect on mpg unless its a lot of stop and go driving. I stop about 6-7 times a day. no traffic.)


    aerodynamics to come:

    -custom fitted side skirts
    -boat-tail (2nd quarter 2011)
    -cab side skirt (where cab meets box body)
    -Custom low front bumper
    -custom made bucket light covers

    upgrades/improvements to come:

    -Aero turbine 4040XL muffler to replace stack
    -long overdue valve and timing adjustment (oops!)
    -espar hydronic 5 coolant heater (anyone in boston want to install this?)
    -OPS1 filter (anyone in boston want to install this also? =)
    - different rear-end gears
    -and yes, this includes topping off tire pressure (im lazy)
    Last edited by rrockfordd; 11-11-2010 at 01:35 AM. Reason: forgot about the air filter. it made a huge performance difference when i changed it today.

  27. 13,400120,20775,8
  28. #14
    Member
    Join Date
    Mar 2010
    Posts
    42

    Re: Cummins ISC Engine

    I have a FL70 w/a 225 hp engine & a tall box & get 11 on the road.Mine also has the 6 speed direct gear,it came w/a 4.11 gear & I changed it to 3.42.

    I have cruise but usually take it off iwhen I'm in the hills .
    I found out if I cheat on my taxes I'll have enough money left over to pay my DOT fines

  29. 14,400275,20775,8
  30. #15
    Junior Member
    Join Date
    Jan 2010
    Posts
    14

    Re: Cummins ISC Engine

    11 mpg is pretty darn good, im assuming you also do a bit of off highway driving because i would expect you to get better mpg.

    i changed the air filter and i added cruise control. with cruise set to 63 mph i got 12.90 mpg even with vermonts mountains and 4 additional rest area stops today.

    i cant wait to get my valves adjusted and slap on that aero turbing 4040xl muffler next week to see what i get for mpg

  31. 15,401214,20775,8
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