Originally Posted by WIbluebird
Aren't the newer Detroits just Paccar engines?
Now, it may be that Detroit lured one of Paccar's designers over and some of their knowledge used in Paccar engines showed up in the newer Detroit offerings, but I've not heard of it. Therefore, I'm not sure where that comes from. I've actually spoken with a head designer at Detroit Diesel who had a hand in the DD15 Class 8 engine, and he put to rest rumors I'd heard that it was based on the 60-series. He clarified that it was indeed a clean-sheet-of-paper design, and shared nothing with its older brethren. If it had anything to do with Paccar or was Paccar-sourced, he never mentioned it.
I've driven Paccar as well -- not terrible, not especially great either. Certainly not nearly as temperamental as the MaxxFarce and Volvo engines. But I can tell you that I noticed nothing similar between the Paccar MX-10 in the Pete 386 I drove for about a year versus the DD15s in the Freightliners I drove. Much bigger engine, and I saw no possibility of interchange between the two.
The Paccar, interestingly enough, was in the shop for DEF nozzle replacement -- twice -- in the same 50k mile interval. It continually spiked a high exhaust temp code running against the governor, and no one could duplicate it, so after the shop told me for the umpteenth time I needed a straitjacket, I cut my cruise speed to 3 under the governor and it stopped doing it. Go figure. But while I'll take a Paccar over an ISX or MaxxFarce, I'm not especially fond of Paccar's MX engines either.