Forum Discussion
RobertRyan
Sep 20, 2016Explorer
ShinerBock wrote:RobertRyan wrote:
Both the Cummins and the IVECO 5.9 engines were the product of the short lived partnership between Fiat and Cummins.Fiat actually produced the blocks for Cummins, before the total separation of both companies.
Wait...what? First you say the Iveco 6.7L is "basically the same" as the Cummins 6.7L, and now you are back tracking to talking about the the 5.9L and post an article only relating to how Iveco used the Cummins 5.9L as the starting point for their 5.9L. BTW, why didn't you post all of that article you posted? Just a few more paragraphs and it backed up what I stated.
Here is where you intentionally stopped.....The final result of the EEA work was the ISBe automotive engine built by Cummins in Darlington and the Italian IVECO NEF engine. Very similar engines, however IVECO use Bosch Hardware/software, Cummins used Bosch ECU with Cummins software and slightly different common rail set up.
Shortly after launch of NEF engine IVECO Aifo took the automotive engine and marinised it.
After just a year tensions between Cummins and IVECO began to smoulder when the Italians failed to pay agreed licence fees.
The Cummins QSB marine engine is based on a US designed engine which came out of the EEA work but based on the ISB (new generation) engine sold to Dodge for the Ram truck, 300,000 units per annum. This engine has the timing gear where Americans like it, back on the front!
At the time of the ISBe launch Ricardo in the UK did a research progam an unspecified customer, I suspect the MOD and in 2003 they had developed a twin turbo ISBe 5.9 reliably producing 500 Hp much of this work was banked for the eventual use in the QSB marine engine.
My biased view of the IVECO NEF.....
Marinisation of a truck engine is a nightmare. Take a look at the raw water pump, Remove the charge cooler in order to change the impeller, simply nuts! This pump is also proprietry, not Jabso, Johnson or Sherwood, try to obtaining price for new pump. Electronics are more than a bit clunky, very poor noise supression algorithim.
Biggest beef, Mickey Mouse 25C test fuel spec dodgy sheet power, when will they ever learn.
When the split came Cummins knew how to obtain more displacement out of the ISB/QSB without weakening major components. Then patented the redesign
IVECO 6.7, 5.9 102mm bore block bored out to 104mm, crank pin offset ground to reduce diameter but increase stroke by 10mm to 132mm.
Cummins 6.7, new block allowing 107mm bore plus service oversize, crank retaining original bearing areas with clever change to balance weights allowing 124 mm stroke without kissing the camshaft.
IVECO NEF motors are around 20% less expensive than equivalent Cummins, but they out sell IVECO by a significant margin............
Basically the Iveco 6.7L uses different internals, has a different bore/stroke ratio, different compression ratio, and a bored out version of the old 5.9L block taking away strength. The Cummins 6.7L is a new block from the 5.9L so they didn't have to weaken the structure of the block to give it a larger displacement.
Also, Fiat did not build any blocks going into our trucks in the US. I don't know(or care) how they did it in the EU, but over here Cummins made all of their blocks.
Where are the specifications for both? Yes they did build the blocks for the intial batch of Cummins diesels.in the US. Show the differing internals?
New block for the 6.7 version of the IVECO., otherwise same problem with a weak block.
You are quoting a marinized version of the 5.9 engine what , relevance does it have to either the 6.7 IVECO or Cummins?
By the way what relevance does the Cummins 6.7 have to the 3 Litre engine in the F150?
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