Signature 600 series Cummins ?

I've heard the fuel mileage sucks on them.

The way it was told to me was....them 600hp motors will pass everything but a fuel stop...LOL

I've heard the same about the C-16 Cats also.

 

Actually they do pretty good, depending on your driving habits they will easily get 7mpg.... Just be careful the sig600 is not known for reliability.

 

Never heard 7mpg's out a 600...lol. Next time they tell you that ask them what it gets with a load on it...LOL

I know a guy who bought one when they first come out, he loved the power but said 5.5mpg was the best he could get. We were hauling heavy at the time.

 

Thats because you put 45k on the drives and another 45k over the spread. Im surprised he got 5.5! lol

 

I only did that once......and it was 45,500 on the front and 45,500 on the rear....

The guy I knew was back when we was hauling coal and scrap and we only grossed out around 100k

 

I have a ISX signature 600 in my Pete.. It's been a GREAT motor.. absolutely NO problems besides regular maintaince and a water pump # 650k.. I have 730k on it now. I've had it since it had 296k on it.. From day 1 it dribbled oil out of the blow by tube, Cummins techs say this is normal... So about every 2500-3000mi I have to dump a gal of oil in it.. (Depends on how much I idle)

As for fuel.. A LOT depends on YOU.. the rest depends on what you are pulling.... A tech once told me.. "The engine has the ability to drink a lot of fuel" He is right! IF you can behave yourself and keep your foot out of it you CAN get decent milage.. 6-6.5 is decent... But, if you want to play and show off... be sure you can get 4.5 pretty easy too!

I'm real happy with this motor.. I missed the electric fuel pump upgrade.. Other than that it is an early motor.. I have always ran the overhead every year.. (Book says every 100k) I average around 5.5 - 6 mpg on regular loads.. (I pull a RGN / 35 ton Double drop, w/ a flip axle.) Some high wide and heavy stuff just can't get any sort of decent milage with it no matter what you do.. (The absolute worst I ever got was a O/D load that was litteraly a parachute shaped piece of duct work.. I got 3.8mpg from Laredo, TX to Richmond, VA)! The 2nd worst was going west across Neb. and Wy. pushing against a 50mph headwind.. Then I got 4.5 no matter how fast I drove.. I tried 55 and tried 75.. same MPG..

The jakes on these work unbeliveably well, I still have original brake shoes in my truck.. (Try that in a Cat..) She pulls great, even with 3:55 rears and 11R24.5 rubber. Best truck I've driven.. Least amount of troubles!

I have heard that they made a couple of different torque ratings and HP ratings.. I heard that they had problems too with the 565's that were turned up to a 600.. or the 600's that were not putting out 2050 ft/lbs. of torque.. Mine is a full blooded Signature 600 w/ 2050 ft./lbs. of torque from the factory.. I hear that it makes a difference.. The same for making sure it was serviced regularly.. (I do my oil every 12-15k) change all the filters, (have always used fleetguard filters!!) I also use additives in my fuel.. My motor realy likes the low sulpher fuel not the ultra low.. I loose 1/2 mi. a gal. when they switched from low to ultra low.. And I can notice the power difference beetween the 2..

Hope this helps?? Any more ?????

 

You must be thinking of the B model CAT with weak jakes. Frankly i found out that the engine brake on any cummins sucks compared to a E CAT.

 

LOL Spoken like a true Kitty freak. hahaha

 

I have a signature 600 with 10000 miles with 5 sets of injectors fuel mileage 4.2 pulling motor out in 2 weeks not impressed