please help me choose suitable engine

hi all, im tossing up between a C15 @550hp and Series 60 (12.7@500hp or 14@515hp) I work local carting shipping containers, normally gross 71500lbs to 93500lbs and travel within a 40mile radius from the port of brisbane. usally return to the port with emptycontainer (gross 42000lbs) we have some hilly areas (not mountains) but often trucks dont get through traffic lights before they turn red again so pretty steep!

my stolen truck had a M11 in it and was rated at 400hp, poor thing worked its butt off, on average i was getting 5.2 to 5.4 miles to a gallon, it was stock with stock mufflers.

Im thinking that a C15 - 6NZ , with donaldson M100463 mufflers, and 5232 code and fuel wire mod will get me better fuel economy and i will also be able to skip some gears (18spd).

all engines are PRE - EGR

Just looking for your opinions, in that will i get better miles per gallon with any of the above engines, compared to the M11, and if possible about how much better would you think i might get. eg 0.2 miles to gallon improvement???

hope there is enough info here.

regards Dave

 

ok i just managed to find some info on Cats (C13 and C15) C13 are recommended for up to a gross of 80,000lbs, so because i often carry up to 93500lbs a C15 is the correct cat engine for my application. Now ive gotta find what the detroit 12.7 and 14 are recommended for in gross lbs. anyone??

Additional info found - S60 12.7 are also recommended for up to gross of 80,000lbs.

 

thanks Nevs, I appreciate ya input, the more info i can get from people here on the forum the better, im the type of person that is anal about research, tech stuff, cant help being this way (its a curse at times) finding info on detroits has proven to be a pain in the butt, so far i have spent over 15 hours on the net trying to research detroits and come up with jack Sh-t

 

Thanks Bro, lol (couldnt resist) ive pretty much decided it will likely be a C15, or maybe? a 14l series 60. Oh yep 2nd hand as i cant afford new and not worth buying new for the money i get for loads over here. I like cummins last truck was a cummins.

 

60 tons? 60,000lbs or 60,000kg? and yes it was a great engine never gave me trouble ran great all the time.