as for the KDP, they have fixed it with the new style gear housing. as for the vp44, cummins stopped using the pump on all newer vehichles, they have taken the vp44 style cylinder head and put it on the 6.7l and just used the common rail pump.

if memery serves me correct, the only place that still makes busses and comercial trucks with the vp44 is over seas (becasue it is really cheap to make, I can buy the pumps brand new from a factory overseas for around 500.00)

most of what type of engines that are in tractors, isx, qsk, and m11.

reasone for the price on the egr, supply and demand, most (90%) of the egr is made over seas, if you were a dealer or supplyer (direct) you would cuss finding out how much these things cost (very cheap) the other reasone behind so expensive (E.P.A) anything that has those three little letter, they charge more (because they can and the united states is really into making a greener planet.

just my 2 penny's

 

i got 3 cummins and i like them all 91.5,97 and 08 but the 91.5 is the cheapest on the billfold over years

 

OK, I have a couple that might be more in line with what you were thinking when you started this topic.

I have a 5.9 12V in my '98 Ram. I've seen these questions asked and answered a dozen times over in here, but not by a Cummins tech: without fortifying mods like head studs, special coolers, o-ringed heads, etc (1) what is a "safe" max EGT to be hitting, and (2) what's the most boost one should cram in there?

 

Anything over 35psi your lookin for trouble... Not to mention its probably doin more harm than good HP wise!

 

Yes, that's pretty much what I've heard.

 

What about the EGT part of the previous poster's question? What's the max EGT one can run in these trucks?

Just for the record I have a 12 RAM 3500 with a 6.7L cummins.

 

aluminum start melting at (660c) 1220F, That is the problem with using aluminum.

in everyone of the manuals that have for cummins, says 1250F is ok all day long, if you ask a cummins tech what temps are safe, you get the answer 1250 is the highest you should go, cummins themselves do not make the pistons, they have contracted factory's to make them.

the average range of tempature from most factorys, for factory pistons (not performance)
between 500-650, if you are wanting something to go hotter, you need to get an aluminum piston with less silicon, somewhere around 11% (the 500-650 is bowl temps or crown)


there is alot more, but to much info to really type.

just try and keep the temps below the melting point for long period of time.

I have seen people have temps at around 1800 for short periods of time.

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here is an artile that has some good info
Diesel Pistons: Engine Builder

http://uotechnology.edu.iq/tec_magaz...hes/Text_1.pdf

pretty much says, have really good rings and tight tolerance, when I was building my engine, I made sure that my tolerance was in the .0005, I did have the machines to do it with, if you do not have access to them, it does get exspensive.