Experience with new SCR engines?

The truck I'm talking about will be getting a new egr cooler tomorrow . 96k miles he lost 1/2 a day today and tomorrow to. Nice!

 

The reason they did that was because of all the problems Mercedes had when they first came to the states. Had they called the DD series Mercedes, sales would have plummeted.

 

my cascadia sucks but the dd15 set at 530/1850 outpulls our 550 cats and still gets 6.5 us mpg average weight 95000 lb on two lane. the cats and 500 series 60 are mid to high 5s . just turned 900000 km no problems other than scheduled dpf cleaning at 500 k no idle= no problems so far

 

I have to question that also. Magoo68 says how the Cascadia he is in out pulls the other trucks and is getting decent mpg and has had no problems, but says it sucks. I would gather that has more to do with the spec'ing (or lack thereof) the rest of the truck. And that has nothing to do with the emissions stuff.

 

I think is just talking at the build quaility cascadias with he says they suck I know for me personally coming from peterbilts and going to a cascadia the interior is just horrible yes they have more room but the seating position and seats is uncomfortable the didn't like the steering wheel Or the dash layout. And the biggest one is they just don't hold up after a couple months the cabints are all loose and rattley. And they just feel cheap when your in one in my opinion. If your one of those guys that look at the truck as a tool to make money its not a big deal but if u look at the truck as your pride and joy money maker I really don't think your gonna be happy

 

Well I agree that the Freights are pretty flimsy inside. The Volvo is all plastic as well but seems to have better cabinets and seems more solid, but the last brand new one I drove rattled and made a lot of noise. It was a real shock. It was really cold when I drove it, so maybe it just needed to heat up a bit on the interior.

If there is a truck with a rock solid interior I would love to see it!!

The Paccar trucks are just as bad in my opinion. I just think that after someone pays a premium on a Paccar product they become instantly deaf to all the same kind of rattles squeaks and other noises. I think all trucks are pretty much the same these days.

My old Columbia is completely rattle and squeak free. But that is because I gutted the dash and doors and isolated everything. Not hard to do but takes a lot of time and isn't something you should have to do with a brand new $140k truck. I used a lot of double sided tape and foam tape along with some other reinforcements at the fastener points to stop the noises I had. But that was at 407k and I think some fat a s s sat on the dash or fell into it or something because a lot and I mean a lot of plastic tabs were broken on most of the large dash parts. I replaced all the usual parts in the dash with new ones, but recently I noticed that some of them had broken again so that makes me thing that the cab is twisting and breaking a lot of the plastic tabs. If you have ever taken a Freightliner plastic dash apart, you know what I am talking about when I say tabs.

I think that most all new dash assemblies in trucks today are pretty flimsy, but that is because they are designed that way to absorb impact in a crash. I am pretty sure this has something to do with it.

More epoxy

 

The SCR motors drasticallu reduce DPF issues.

Simply put:

DPF gets plugged by soot. Soot is unburnt fuel.
SCR reduces NOX emissions externally. NOX levels increase with hot complete combustion
Before SCR, OEMs relied on large amounts of EGR and cooler combustion temps. basically trying to deplete oxygen and cool down the combustion.
Anybody who knows anything about ICE engines knows they operate on heat. The hotter the burn the more energy there is, this takes oxygen, advanced timing, and high combustion temps. Things that are all back in the new engines. The complete burn of these engines produces uncontrollable NOX emissions which is where the SCR picks up, it does its thing downstream simply by dosing the exhaust with DEF which reacts in a catalyst. Theres a dosing module, NOX sensors, catalyst, injector and tank. Its a simple setup. The positive side effect to complete combustion is that there is very little unburnt fuel which means the DPF is going to be a happy camper. The amount of DPF issues has drastically been reduced on the new engines. The filter fills up much slower which allows more time for passive regenerations to occur, this extends the intervals between active regens (where fuel is injected) and off the truck cleaning exponentially.

Cummins is falling off lately. Their off road engines are being pushed out for terrible fuel economy, and poor performance. Every manufacturer used to use them, now they are few and far between.

They also seem to have had the most troubles with emissions equipment since the start in 2004 for on road. Maybe its costs. With them being the only non-"inhouse" engine they probably have to cut a lot of corners to be competitive. However its causing them to loose market share and soon trucks may be like the auto industry, you buy a PACCAR product you get a PACCAR engine, you buy Daimler you get a daimler, you buy Volvo you get a Volvo, you buy Navistar you get a Navistar. It largely is almost entirely this way as it is.

But look at the $$$ hes already saving over an 07.5-10 truck.

 

That makes a lot of sense.