Reducing Oxide Emissions... DIY?

[Phantom]

You could coat the exhaust to keep the heat so it will not cool before the CAT.

[TheEnemy]

Looking at the vehicles you have listed,

On the VW a few things since its pretty old, some may cost a bit.

A newer high flow 3 way cat, as close to the engine as practical.
a wide band O2 sensor with a display (it could even be a multimeter, and translate the voltage to AFR yourself)
Use the wideband display to adjust the carb to stoc.

The other one
wide band O2 sensor, so you can at least see what is going on.
See what you might be able to do as far as programing the ECU.


For either one, make sure they are tuned properly and maintained.

The Cats require NOx and HC to work properly, but to clean up the NOx the most slightly rich will reduce the NOx at the expense of higher HC emissions.

[Sven7]

It's for the Probe. I had the Rabbit's cat removed a couple years ago because racecar.

Now that we all acknowledge that carbon dioxide is a greenhouse gas and the current high levels are bad for the environment, let's move past it and work on ways to lessen CO2 emissions.

Chaz, can you elaborate on the emissions percentages for cold/warm ice's?

[mwebb]

there is no high C02 levels , the atmosphere acts like an accumulator , plants and trees always purge C02 from the atmosphere and
restore much of the 02 used in IC engines to the atmosphere
which is
confirmed by
stable
02
levels
in the atmosphere
and
C02 is not contributing to the current declining/decreasing temperature of the planet

the question is what about the H20 ?
how is the 02 from the H20 being restored to the atmosphere ?
we know it is because 02 levels in the atmosphere are stable / constant

since we know the by product of combustion is
primarily
H20 + C02
and 02 levels are stable (in our atmosphere) , then using KISS
something is also restoring the 02 from the H20

the only way to reduce C02 output is to combust less HC
since HC + 02 are the inputs to combustion
and
H20 + C02 are the (primary) outputs of combustion

for the most part
input ratio is fixed at 14.64 parts air to 1 part HC
so , since 02 is 20% of the air

about
3 parts 02 to 1 part HC

a smaller engine or same engine and lower rpm are the only way you can reduce either C02 or H20 outputs of a IC engine
the outputs ratios are fixed by the input ratios
no rocket science involved

would you say clouds (H20 vapors) are
significant
greenhouse gases ? yes you would
is H20 vapors a byproduct of combustion ?
yes it is
yet
the overall temperature of the planet is decreasing and has been for a few years ... are the two related ?
hell no .
are ocean levels rising ? no they are not -
so
we know 02 in the atmosphere is stable and there is no additional H20 in the oceans ...
then
what is separating the H20 back to h2 and 0 ?
what becomes of the H2 ? we know where the 0 is .
thank me

Originally Posted by Sven7

.......

Now that we all acknowledge that carbon dioxide is a greenhouse gas and the current high levels are bad for the environment, let's move past it and work on ways to lessen CO2 emissions.

Chaz, can you elaborate on the emissions percentages for cold/warm ice's?

[bestclimb]

Originally Posted by UFO

Hands down the coal-fired electricity. Cold engines are ridiculously inefficient and coal plants, while filthy, have a much higher thermal efficiency.

I am willing to admit the comparison between efficiencies does not address the entire question as the 800Wh is not a watt for watt replacement in powering your vehicle.

800 watts of coal fired volts does not move you down the road at the same time though.

[christofoo]

Originally Posted by Sven7

...
Now that we all acknowledge that carbon dioxide is a greenhouse gas and the current high levels are bad for the environment, let's move past it and work on ways to lessen CO2 emissions.
...

Do I sense some confusion?

CO2 emission is directly related to MPG. Ecomodding reduces CO2. The cat does not.

CO, NOx, and HC are smog precursors that the cat converts to more stable molecules.
CO, NOx, HC ---cat--->> CO2, N2, H2O.
Catalytic converter - Wikipedia, the free encyclopedia

[Sven7]

Oh, sorry, durr. Hah! Shoulda payed more attention in Chemistry.

[oldejack]

High combustion chamber temps promote excessive NOx production. ..
EGR reduces the high temps by putting a non flammable gas (exhaust) into the intake stream, reducing the amount of combustion heat created per ignition event.
Yep, that's right, it makes the individual event run rich.
The single best way I have found to minimize NOx output is to make sure the EGR system is in top shape, this often includes clearing out the EGR piping since it gets gradually clogged up with the particulates found in the exhaust stream.
I had a 2005 ML430 in the shop last week. .. here's a pic of what the EGR pipe looked like
As you can see, well. ............ there was a good reason it threw a CEL.

A heater element of the O2 sensor will enable it to respond sooner following a cold start since it doesn't function well until it gets up to temp, once the sensor is up to it's operating temp the ECM can do it's thing since it has assumed valid data.

[oil pan 4]

GM once added a "cold start injector" to some of its V6 engines.
On a V6 engine the #1 cylinder had a 7th fuel injector added to it.
This was out of the mid 1980s and I am sure there are better ways to do it now.

Most people unhooked the cold start injector to improve cold start up fuel economy.

[mwebb]

..."EGR reduces the high temps by putting a non flammable gas (exhaust) into the intake stream, reducing the amount of combustion heat created per ignition event.
Yep, that's right, it makes the individual event run rich."...

NO that is false
EGR
when functioning as designed
dilutes the air fuel mixture with an inert gas , it does NOT change the air fuel ratio
EGR does NOT make the mixture rich or lean

the cold start injector in early fuel injected systems only operates when the starter is operating
and length of operation was regulated by temperature , the cold start injector did not operate at all on hot restarts

cold start does not function at all when the engine is running