grimjaw said:
I have a question... What about farm truck that never hit highway sppeds? Do the they just explode after 50K miles?
can happen sooner than that.. well, not explode but what happens is when these things get clogged enough, an indicator light will pop on, tellling you that it's clogged, and you should remedy the situation.. on school buses, the engine will eventually just shut off ( before being seriously damaged )if it gets too clogged.. I would guess it works the same for any dpf equipped vehicle..
one district I know of has these things plug in intevals of a thousand miles, to five thousand miles..worse in the cold weather, because idling for a long time will load them up too.. many school buses don't warm up enough, due to the short distances and stop and go driving, and you also have to remember that the dpf's can't always be located as close to the head pipe as you'd like, so even if the bus is warmed up, the exhaust is cooled beofre it gets to the dpf..this is an issue with trash trucks, and off road equipment as well.
one of my school district customers is buying some new buses this summer, and their choices were Thomas, with the dpf's, and bluebird, with the oxidation catlaysts.. I gave them all of the info I have on these things, and bluebird it is..
anyway, you guys don't drive school buses I know, but I wanted to at least let you know what DPF's are like to live with.. again, they're good for OTR trucks, and that's it.