600's come "pre-boxed"??

[Sarge]

I have a few wandering thoughts to share regarding the 600's and the fueling issues. I may be nuts, but it would'nt be the first time... ...



Many have reported that the 600's run hot, even stock. Adding a box, namely a pressure box can send the EGT's through the roof. This is no major surprise, as one of the touted improvements to the 600 was the added injection event. It accomplished a variety of issues, including quieter running and MORE POWER, hence the 325/600 rating.



Now, when I owned a 97' and a 01' Cummins, the secret for max power was fuel, and air. Now that DC has already added the fuel, increased the exhaust size, and maximized the breather tube, doesn't it make sense that these motors run hotter?



And it also makes sense to me that if you encores fueling with a third injection event, you are adding more fuel to each burn cycle, thus lowering the fuel available in the tank for moving the truck. It is probably not much percentage wise, but the added fuel has to come from somewhere. Sure I would like to get the same mileage that I got in the 2500 2WD six speed, I just think that a heavier, dual wheel 4X4 3500 has to be harder to push.



Overall it is still a GREAT truck. And that red is sexy as hell... .....



I may be way off base, and if I am, say so!!:-{}

 

[mattymac]

A motor can only flow as much air as its weakest link, in this case the turbo. Just because you now have a 4" exhaust doesnt mean it will lower EGT's. The added power of these new trucks and same small 9cm2 exh. housing on the turbo can only get out so much air and heat. They use it for spoolup, Emmisions, and driveability.

 

[Big_Daddy_T]

Id take a little lag for a bigger turbo. I would imagine its emissions that makes it a 9cm.

 

[mattymac]

Originally posted by Big_Daddy_T

Id take a little lag for a bigger turbo. I would imagine its emissions that makes it a 9cm.

Wouldnt we all like a bigger turbo on our trucks. But in 01 is when they intoduced the 9cm housing and was there an emmisions cut then? The turbos from then till 04 are basically the same but now with the 600 it has a slightly bigger compressor wheel and housing along with an electronic wastegate. Ill admit that the tiny housing makes these trucks better to drive and alot of grunt off idle but myself and many others would probably give some of that up for some heat reduction from a bigger exh. housing. Its like the funnel effect, alot in but not alot out.

 

[Sarge]

I am told that Piers is doing wonders with his turbo, not a lot bigger, but big enough to get the job done without killing driveability.

 

[B D One]

For those that attended May Madness we had a Cummins project engineer as a speaker that was in charge of the 3rd gen 5. 9 redesign. After some corporate canned statements about the fuel economy he admitted that the higher heat, fuel consumtion, and turbo combo was driven by emmission requirements.



He also said that many components have been upgraded to deal with the extra heat. He used a 2nd gen HO as an example of what these engines can tolorate, 1500 degrees was not uncommon in those engines, and they did not have the better quality parts the 3rd gen engines have. I told him I was seeing 1400 plus stock and was concerned about damage, he said run it all day at 1450 and don't worry about it. They see 1500 consistantly in commercial applications.



Not that I will try to do that, but it is nice to hear a Cummins engineer say its ok to do. With the TST CR installed it get hot real quick!

 

[ttreibel]

Wow 1450 all day I thought it was 1300 all day..... Guess I can crank up the towing a little harder now