California crack-down on old CAT diesel m-homes

[Cat]

Dpf does use fuel and gets more air from the turbocharger system. The reason for the heat is to burnt the carbon /particulates to ash. Without this process a DPF plugged up solid in a 100 miles or it would have to be the size of a rv. Does it destroy it-- no it burns it to ash. Then when the DPF is serviced the ash is blown out and disposed in land fills. I've worked in shops before diesel pollution controls and after the controls. At the end of day in the old days. You would be blowing black snot out you nose. After DPF you just got snot. So I know which shop I want to work. Does it remove carbon dioxide no.

[DaveDsl]

Originally Posted by Cat

Dpf does use fuel and gets more air from the turbocharger system. The reason for the heat is to burnt the carbon /particulates to ash. Without this process a DPF plugged up solid in a 100 miles or it would have to be the size of a rv. Does it destroy it-- no it burns it to ash. Then when the DPF is serviced the ash is blown out and disposed in land fills. I've worked in shops before diesel pollution controls and after the controls. At the end of day in the old days. You would be blowing black snot out you nose. After DPF you just got snot. So I know which shop I want to work. Does it remove carbon dioxide no.

Incorrect Assumption, In a Regen the Ash if deteriorates to less than 2 microns discharges to the Ambiant area. ONLY Particles Greater than 3 microns are retained so around 70-80% discharge, the remainder have to be COOKED Off the DPF in a Natural Gas Furnace at above 1500 degrees, those materials discharged to Ambiant area as too small to detect. They are NOT Collected for disposal. SCR is Supposed to change Co and Unburnt Fuels to Water Vapor is the EPA Lie, as Diesels do not produce enough CO to accurately measure: .05% Approximately. CARBON residuals yes in a closed environ as a Workshop collect in the nose and are ejected as collect in Mucus(Snot), they are also heavier than Air and settle to Ground where said Carbon degrades to consumables for natural growth. Took ALL DAY running multiple Engines in a Closed Shop back in the day to blow Black Snot, was worse if Welded or Used a torch for cutting. Not a new concept. Had a BANDAG shop at the first employer in 1970s, those boys blew black snot like coal miners. TIRES on pavement produce more and finer particulates than Diesel Engines do or have.

[Cat]

Originally Posted by DaveDsl

Incorrect Assumption, In a Regen the Ash if deteriorates to less than 2 microns discharges to the Ambiant area. ONLY Particles Greater than 3 microns are retained so around 70-80% discharge, the remainder have to be COOKED Off the DPF in a Natural Gas Furnace at above 1500 degrees, those materials discharged to Ambiant area as too small to detect. They are NOT Collected for disposal. SCR is Supposed to change Co and Unburnt Fuels to Water Vapor is the EPA Lie, as Diesels do not produce enough CO to accurately measure: .05% Approximately. CARBON residuals yes in a closed environ as a Workshop collect in the nose and are ejected as collect in Mucus(Snot), they are also heavier than Air and settle to Ground where said Carbon degrades to consumables for natural growth. Took ALL DAY running multiple Engines in a Closed Shop back in the day to blow Black Snot, was worse if Welded or Used a torch for cutting. Not a new concept. Had a BANDAG shop at the first employer in 1970s, those boys blew black snot like coal miners. TIRES on pavement produce more and finer particulates than Diesel Engines do or have.

I have actually removed dpf filter. You first do a ash service regen. This is a higher temperature than a normal regeneration and a longer one. After the ash service regen the the dpf is removed and put on a simple stand. A simple clocking air nozzle blows the dog in reverse to the normal flow. The clocking device makes air every passage is blown backwards to remove ash. The ash is then disposed. When this first was being done no one knew how dispose of the ash.
The turbo lines supply boost pressure to increase air flow to the regen head to increase regeneration temperatures. The def is injected injected after the dpf. Since water is a major part of the Def I'm not sure why it would be injected to remove water. We in discussion with the emissions engineers said the dev was only for box reduction.
A lot of what say makes sense but much of what you say does not actually match what really happening. Safe Travels. Oh by the way after 44 years in different service positions at a Caterpillar dealship. In mine shops dealer shops I know what I blew out of my nose. All the shops had some sort of ventilation some positive some just roof vent. So I know what black snot looks like.

[DaveDsl]

Sorry to state what was just stated is absolutely Incorrect, the SCR is AHEAD of the DPF, it cannot produce an Ash in the DPF if is Not already cooking the exhaust plume materials. Yes the SCR is there to reduce particulates so the DPF can collect them in that combustion process as well decreases NOX but to a Limited value. The Regens are supposed to reduce that ash so that CAN be ejected.

Do not know who fed you those assumptions or trained you but they are as foolish as are ignorant of direction of flow in these systems. I saw the first units to ever hit the market and as such saw how they failed early on. CAT only recently began adding them to their OFF Road Engines to produce Tier 4 Equipment where these have been out there over fifteen years.

[Cat]

Caterpillar was putting Tier 4 on heavy at least 12 years ago. I was working on them on heavy equipment engines. And I retired 10 years ago. And yes there were many problems with them including the ard head and software issues. It was very difficult to get a successful regeneration with the rapid changes in throttle and loads. The expense and complexity was a large part of the reason Caterpillar got of the on hiway engines. Have fun

[Spdracr39]

Thread Warning

Stop the back and forth bickering. State your opinion and move on.

[DaveDsl]

Currently Done here, will not respond further as no need.

[Archer2]

Originally Posted by DaveDsl

Sorry to state what was just stated is absolutely Incorrect, the SCR is AHEAD of the DPF, it cannot produce an Ash in the DPF if is Not already cooking the exhaust plume materials. Yes the SCR is there to reduce particulates so the DPF can collect them in that combustion process as well decreases NOX but to a Limited value. The Regens are supposed to reduce that ash so that CAN be ejected.

Do not know who fed you those assumptions or trained you but they are as foolish as are ignorant of direction of flow in these systems. I saw the first units to ever hit the market and as such saw how they failed early on. CAT only recently began adding them to their OFF Road Engines to produce Tier 4 Equipment where these have been out there over fifteen years.

I believe you must be confusing the DOC with the SCR. The order of the exhaust components are (from turbo out to exhaust pipe):
DOC then DPF then SCR then then Ammonia Slip Catalyst

This is correct for the most recent RV engines. I have no knowledge of Diesel engines for off-road or industrial applications. Since this is an RV forum, I think excluding other types of engines is fair.

[Cat]

Originally Posted by Spdracr39

Thread Warning

Stop the back and forth bickering. State your opinion and move on.

My apology also.