Your ideal emissions setup?

Now don't get me wrong. I am not talking about eliminating EGR from a engine built with egr. I'm talking about optimal redesigned emissions system. Which is what the manufacturers are leaning towards now. My opinion is they should have done it in 2010 but that would be admitting they screwed up to start with.

 

Interesting. Subscribed.

 

I read into the Cummins X12 engine, which doesn't have EGR. It looks like it's designed for motor coaches, so it is not going to have the same load demands as a class 8 truck. I believe that's how they are able to produce less NOx, since the engines will be tuned to generate less heat.

Another thing to consider is that when the next stage of emissions rules come out, will they just end up having to reimplement EGR on those newer models?

 

Must be those newer trucks I heard about. mine came from the factory without it.

 

I think you will find it is for off road use. My understanding is that on highway X-12 will still have EGR. You can spec a class 8 with the X-12

 

I think the problem is in dealing with the volume of air. I would guess that the time needed to reduce the emissions levels is too great when you consider anywhere from 200cfm to 600cfm are continuously flowing in and out of the engine. Any blockage downstream causes heat and inefficiency upstream. Recirculating hot air back into the intake creates inefficiency and increases egts.

In my eyes they need to come up with a whole new snake oil to enable the unattainable complete and clean burn while keeping the exhaust free flowing.

 

Adding a Dorothy to the egr system reduces soot in the intake.

 

You know what would also help? If the manufacturers made servicing EGR valves and coolers easier. It's like they purposely tuck them as far away as possible, and make you bolt off every other component to access them.

 

Up until that piston burned a hole in itself .

 

The point of EGR was initially was to lower cumbustion temps to reduce NOx by lowering oxygen available in the cumbustion chamber. This creates a dirtier burn and produced more particulate matter and led to the DPF being added to catch the pm and the burn it off with extremely high temps (more NOx created).
The real piss off part is here in North America they knew everything before SCR wasn't going to work. Europe already went through 2002 to 2010 stages before we even started. But no one wanted to build the DEF infrastructure before the engines were being built and no one wanted to build SCR engines or buy SCR engine before there was a stable DEF Supply chain across the continent. The EPA was asked to delay the '07 regs to allow the DEF infrastructure to be built so engine manufacturers could go straight to the SCR system and the EPA denied the request.