Making more HP in a Cummins M11

Discussion in 'Trucks [ Eighteen Wheelers ]' started by xkmail, Apr 26, 2007.

  1. rebeloutlaw66

    rebeloutlaw66 Light Load Member

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    Sep 2, 2009
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    I have a 96 international 9200 with a 350hp m11 and Rockwell 10 spd with 307 gears in the rear and I get 7mpg all day and it has plenty of power although I'm not the first one at the top of the hill but its a work horse of an engine.
     
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  3. earthmover

    earthmover Medium Load Member

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    Jan 27, 2009
    castalia , north carolina
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    is the cpl listed on the tag for the motor ??? my trans is a rto14709mll, and my truck is set at the factory rate of 280hp1250tq and would love to bump it up just a little..i get 6/7 mpg dep. on how i drive with 4.11 and 11/22.5 tires..my truck is a dump and i can up to 62000 legal...i would like to go 350hp if possible...and bump the tq to a safe level ..thanks mike
     
  4. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    I would turn it into a 370/410 they run good
     
  5. earthmover

    earthmover Medium Load Member

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    Jan 27, 2009
    castalia , north carolina
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    hey thanks truckmechanic i should have asked you in the pm lol.. what about the tq. how high would you go on it??? i know the trans is the factor rto14709mll thanks again..mike
     
  6. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    The only real diffrence I see in all the ones I've built is rocker arms block stiffner and diffrences in a conn rods and injectors we run them from 370-410 in 2 axle powder trucks there pretty good motors they pull good we are running eaton 10 speeds not super 10 we also have a few in cement trucks that ate set at 330 they run pretty good as well.I would call and see wha t i your specs are at cummins just to be sure I don't see a problem running 370 I would add a block stiffner to see if you have the updated block there is a pad on the left side near the back off the block near the cyl head mount the updated block will end xxx if you need a engine number for a block stiffner or spec let me know and ill get you a number from our truck
     
  7. JFarmer

    JFarmer Bobtail Member

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    Aug 15, 2012
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    Ill take Fast and Reliable
     
  8. AUSSIE DAVE

    AUSSIE DAVE Road Train Member

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    Feb 21, 2010
    OZ - Brisbane
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    1450TQ & 400 HP, mine ran awesome at these specs and great miles/gal, run open type mufflers like the donaldson and keep fuel & air filters clean, also to add I was constantly hauling 93,000 to 96,000 lbs
     
  9. Dynomite

    Dynomite Bobtail Member

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    Aug 21, 2016
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    I bought a 1998 kw t800 with an M11 in it. Guy said it is set at 400hp. Right out o the shoot I have been having overheating issues. I tried hailing roughly 50k and 60k loads and I didn't make it 20 miles before the buzzer was goin off and the high temp light was on. Took it to the shop, had the radiator blown out and the thermostat replaced. Took an empty 40' container to WV (bout 14k lbs) and it was still overheating pulling the hills. Buzzer is coming on at around 200 degrees and is staying anywhere between 200-215 degrees. Could it be that I have something wrong with my gauges or my next step in the cooling process would be a new radiator. Thoughts? Guy at shop said radiator is starting to rot on the inside
     
  10. 062

    062 Road Train Member

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    10,434
    Oct 20, 2013
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    Start with the simple stuff. Check the cac and piping for leaks. How's the air filter look?
     
  11. Dynomite

    Dynomite Bobtail Member

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    Aug 21, 2016
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    You'll have to excuse me, I am rather new to all of this. What piping and for what kind of leaks? Fluid wise it doesn't leak at all. I will have to check out the air filter in the morning.
     
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