Figured Id Introduce Myself

Clean diesel is a 2010 dies with SCR and DPF. It's fairly clean and is what they are referred to as.

New diesels are still built heavy but overall weight is being reducing by using aluminum and compacted graphite iron.

Diesels don't like to be started and stopped very much but neither does a gasoline engine. I think all of the current diesel hybrids just keep the engine running constant to generate electricity to propel the vehicle which dies save on fuel end emissions.

 

Oh I know all about dpf issues, fords throwing flames , and others clogging up.

Currently they do have a lot of the bugs worked out of them but they dk still plug sooner if the car doesn't get worke from time to time.

 

Because it would be too expensive.

 

those numbers are hard to find and I don't have the answer

However on average diesels have lower emissions per mile due to their efficiency.


You guys also need to realize that efficiency is not measured in mpg irbid measured in bsfc.

 

What does the above article have to do with DPFs?? It doesnt mention anything in the article about them. Maybe I am missing something.

If its starting on fire due to the DPF then that is the manufacturers problem. Just like the Toyota issue, and just like the hug Ford recall that is still ongoing for cruise control switch fires.

 

Just read that article.

The US technology is somewhat different as our DPFs dont require additives. And active regeneration can take place at idle.

So far there is only one safety concern with regeneration and that is the immense heat. However manufacturers have adressed this with interesting exhaust tips. The Duramax trucks have the "Bazooka" tip, the powerstrokes have the dual tips and new semis all have huge stacks. The purpose of these tips is to mix cool air with the hot air.

 

Gasoline engines tend to be more tolerable however diesel can do this as well. Standby generators do it all the time, they go from sitting idle for months to full throttle in a copuple minutes. You just have to keep the coolant warm and they will run fine.

The thing to remember with any starting and stopping of ICE engines is the initial startup emissions which are high on both gasoline and diesel engines.

 

How I'd the dpf cause the fires on those cabs?? Like I said it's usually a manufacturers fault for engineering something wrong.

How old are those cabs? Were the dpfs add ons or from the factory.

Ford had three trucks cause fires from flames shotting out of the exhaust. Later investigation revealed that an uncontrolled amount of fuel was dumped inti the exhaust causing the flames. An ecu update on 34,000 vehicles was performed and the issue was resolved.

 

The article referred to a fluid that was injected before the DPF which is not SCR although I suspect it was just an editorial error.

So what is SCR? Selective Catalyst Reduction. It mounts after the DPF and basically converts NOX into nitrogen and water using DEF.

So what is DEF. Diesel Exhaust Fluid. Plain and simple its ammonia just like your pee and just like the stuff farmers put on their fields for fertilizer, however dont try to pee in the tank or put some 28% in it, the vehicle will reconize this and will not run. AdBlue is one brand of DEF.

The only downside thus far to SCR is that you have to fill the DEF tank every oil change.

Almost all Tier II Bin 5 Engines (build date after 1/1/10) have SCR. The 6.7 Cummins is rumored to not need it as it has advanced in cylinder technologies to reduce NOX.

As for DPF issues yes i did good "DPF Issues" and what I founf was very outdated articles explaining issues that have already been corrected. Most of these issues are plain and simple, engineers faults.

Ford recalled 34,000 of their 6.4L powerstrokes for blowing flames out of the exhaust. 3 started fires. A simple re-program of the computer fixed the issue. The engineers didnt put a limit on how much fuel could be injected into the exhaust.

The plugging issues on vehicles is again the engineers stupidity. The only vehicles plugging abnormally are ones that do not have Active regeneration.

There is one other downside to DPFs besides fuel economy and that is heat. The exhaust gets very hot, which is why you see very interesting exhaust tips on DPF equipped vehicles. The Duramax has the "Bazooka", powerstroke has the twin tip and all new semis have huge tips with air inlets. The purpose of these akward tips is to mix cool air with the exhaust.

 

Not entirely.

But initiall startup of any motor is where the highest emissions always occue even if its the lowest emissions vehicle on the planet. Unless the prius has some other technology. I can see it being lower if they use electricty to get the motor turning before making it create power.

The prius is low emission because of the hybrid system, im talking about using a diesel in place of it to drop emissions per mile even more. Emissions per gallon may not drop, but per mile they should in theory.