Just like there's no root cause for injector failures in Duramaxs.

 

well you're an engineer hoot, lets see your brilliant explaination of it.


you want my oppinion? The FICM. LB7 injectors ran on 96volts switched DC negative-polarity power. The electrical system is based on 12 volts. Bosch QC isnt the greatest, and unless everything is flawless in the high frequency inverters, circuitry, switching devices, OPAMPS, and transformers, there is going to be SOME noise/EMI in the 96volt output to the injectors. You simply cant get 96volts from 12 volts and have everything be perfect. You cant get something for nothing. The noise and slight frequency oscillations could possibly cause undue wear on the injector solenoids, causing them to not have a consistant duty cycle and heat up more than they were designed for. The solenoid can only take so much and finally burns out, sticking the injector open and filling the crankcase with diesel.

and LLY injectors/FICM's are based on a 48 volt DC neg-polarity system, and they dont have any injector problems, Im not electrical engineer but 96volt LB7 injectors fail, and 48volt LLY injectors dont. Coincedence?

back to overheating.

 

Maybe the 48 volts is causing the overheating

 

well the LBZ injectors run on 12 volts and they dont overheat OR eat injectors, go figure??

 

The injector failures I have seen were due to internal seal leakage on the injector that either goes to the sump or into the cylinder. White smoke, poor mileage. FWIW

 

I sure didn't like the 96 volt injector harnesses on the PowerChokes!

 

GM flew in a lawyer from Dallas, some kinda district engineer guy from I forget where, and a GM Corporate guy from Michigan who sat there taking notes but never once testified. The only time the GM Corporate guy spoke was at the end when the hearing was closed and we were all getting up to leave, he was impressed that I produced the DVD using windows and thought the video was excellent. Then we all talked about where they could go eat and when their flights were and all that friendly stuff.

Rick only had the one LLY briefly before selling it, so he didn't meet up with the conditions required to overheat it. The fact that he has no less than THREE LLY Duramax trucks that overheat defies your logic that it is only a very few trucks that overheat. Do the math on the odds of a guy drawing three needles out of the haystack and get back to me. Why you can't see the impossibility in that luck, especially when he has both 04.5 and 05 trucks spread across the production run, I have never understood. I know you don't WANT it to be all of them, because that means you too, but sorry it is.

I myself and other people are willing to lay down serious money that you cannot produce a STOCK LLY that will not overheat in temps over 95* as long as it maintains the speed limit towing a legal load that we provide over a route we name. Nobody has stepped up to that plate, wanna be the first?

Ben, to this day you are not getting it. The root cause IS the lack of capacity. They added more heat load without adding more capacity.

The next thing you need to come to grips with is it is ALL LLY trucks will overheat if pushed, not just a select few. Its the condition of operation that bring out the overheat. Simply saying that you towed 11-12k and that you didn't overheat means NOTHING. It takes over 90% engine output for at least 5 to 6 minutes straight in temps over 90* before you will see the problem. I can tow a 15k horse trailer that is barely above the cab that has good aerodynamics and it will not overheat me because it requires less output from the engine than a high drag 12k load does to make the same speed. Rolling hills or grades that go flat every mile or two allow the system to recover again and again because the load is removed.


FACT: ANY LLY OWNER THAT HAS NOT HAD HIS TRUCK FLOORED FOR AT LEAST 6 MINUTES AGAINST A LOAD IN HIGH AMBIENT TEMPS IS IN NO POSITION TO ARGUE THEY "DO NOT OVERHEAT" BECAUSE THEY KNOW NOT WHAT THEY ARE TALKING ABOUT. IT IS LIKE SAYING YOU CAN SWIM THE ENGLISH CHANNEL WHEN YOU HAVENT TRIED IT.

The above statement rules out all your quarter mile passes or truck pulls, they are over in a few seconds, no comparison to SIX MINUTES worth of hard work with no letup. It rules out all grades that are less than 5 or 6 miles CONTINUOUS climb, which pretty much takes away your entire side of the country. The high outside temp requirement rules out most days of the year for the Northeastern USA where you live.

GM missed the overheating in their testing because they tow test with lowboy trailers with concrete blocks on them or water tanks. No drag, the load is below the cab height. Take away the drag which can be 4 times the load as the weight is, and yes you find yourself going up the grade at 75% engine output and not overheating. Replace it with a full frontal RV and you get owned.

understand now? If not tell me which part you don't get and we will cover it.

.

 

I still have the same truck, it only has 22,000 miles on it and of course a new engine. I use it as a testbed for product development. I may sell it later and get a 2008 LMM.

Ad removed I have a radiator manufacturer make the rad and a fabrcator builds the subframes and I assemble and package the rest of the kit. The fix has been out for a while with 100% cured which will stay that way.

Difference in the 06 models? Well, unlike Ben, GM finally figured out the cooling system lacks capacity, and added a larger radiator, a larger engine fan, a much better sealing fancy fan shroud, a larger air cooled tranny cooler to lighten the load on the one in the radiator, a redesigned engine oil cooler, they spaced the intercooler away more from the rad, added a cold air intake to prevent thermal recycle, installed new air control guides for better airflow across the stack, and gave the 06 and up a higher flowing water pump. They actually did all that to the last LLY trucks before the LBZ.

Gee whiz, sure is a lot of changes to a cooling system that was fine, huh????

.

 

GM still hasn't learned how to build a working truck.

 

They are very capable of doing work, but they are too "nice" like big concrete cadillacs to WANT to risk scratching them or messing up the nice interior doing real work.

But otherwise a new GM diesel right now rules the road easily as far as abilities. For now. Who knows how Ford and Dodge will respond. They have each held "the crown" a few times since 2001 to now.

.

 

To have to take GM to court because it can't keep up with a lowely older generation Dodge

I YOUR mind it rules

Over the road you see Dodges pulling the commercial loads and GM's pulling boats and TT's.

 

We can track down the Dodge in the video and give my truck the same load as he had and I would KILL him over any road. It isn't fair to compare that older gen Cummins to a Duramax, same as you can no longer compare older Duramaxes to the current Dodge. Each manufacturer is constantly changing and updating to be on top.

No Hoot, in your heart you want it to, but for now the Dodge does not outpower the GM offerings. If we go get two stock trucks off the lot, the GM HD will run off from the Dodge no matter the load. This is not opinion, its fact, they have already been tested and measured.

I expect that Dodge will brew up a larger engine or something, like Ford is, but for NOW the GM trucks are on top in in power and torque and transmissions.

Unbiased FACT.

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I never said one could pull better than the other. It's about efficiency, consistancy and reliability.

 

True, you didn't say that. I have no data to dispute these points with either way.

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[quote=TxChristopher;1315312]I still have the same truck, it only has 22,000 miles on it and of course a new engine. I use it as a testbed for product development. I may sell it later and get a 2008 LMM.

What amazes me is you are happy if just a stock duramax wont overheat.
Why after all your trouble would you want to get a new Duramax??
I put 10,000 +miles hauling hay last summer I know what I weighed and I am not about to post it. Another thing was I was about 11 1/2 wide. In the stock setting my 06 (yes it is rated less hp and TQ then a stock 06 Duramax) I could pull it about 55 mph With my tst on 2/2 (that is about 50 extra hp and 120 extra tq) I pulled it 75 mph and some days it was 90 -100 and I never had any overheating. The cooling fan rarley turned on.
I'm not saying buy a Dodge, but after all you went threw I think the last thing I would buy would be a duramax!!