How much can you get from a m11

I had one and got 400 max out of it.

 

I wouldn't rely only on what I am about to say, but I used to have a S60 Detroit 11.1 with a Pittsburg Power box and routinely ran it up approximately 430-450 hp. Got 850k miles out of the engine, but I would have gotten a lot more except for 2 cylinders got washed out by trickle coolant intrusion from coolant galleys in them. The other cylinders were in very good shape. Glycol never showed in any oil sample, which I did every 15k miles. Only sodium and potassium in trace amounts, which I figured were environmental or from somewhere else. Had I had the head pulled off, I could have caught in time. I was told that the those cylinder seats could have gotten slightly out of round. But I wondered if if retorquing the head bolts after it's rebuild between 100-200k miles would have prevented. I wouldn't think so because an S60 12.7L and 11.1L blocks are the same (less torque on 11.1) and head bolts are designed to stretch to maintain torque. I think the head I had was also used on 12.7s-most common head I was told if I remember right. I am sure the same size head bolts are used for both 12.7 and 11.1. Anyhow, I would think you would be ok at a little higher hp. Check with Pittsburgh Power. They are a Cummins dealer and have a lot of experience with turning up engines. They are a little pricey. But I trust their work.

 

can get way more than 400hp not sure how long it would last

 

Had a stock 1999 m11 set at 400 hp 1550 ftlbs it pulled fine but jakes were very weak .. block fretting is a issue apparently if you turn up over 450 hp

 

We ran it at 1800 rpm in the mountains when pulling grades otherwise it was 1450 to 1500 I believe.