ATI Supercharging

[Billy-Bob Doughnut OBE]

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I'm not all that familiar with catcons, but I am pretty sure that they =
are
used solely for reduction of unburned hydrocarbons and combustible =
products
in the exhaust.  After all, a catalyst by definition enhances or causes =
a
chemical reaction to proceed faster, or initiates a reaction under =
conditions
which it would not normally occur.  Logic dictates that if you are =
running=20
lean, there would be less combustible by-products, and the catcon would =
not
have "fuel" to react with, thus the internal temperature of the catcon =
would
be lower.  (Jeez, I sound like Spock there :)  If, however, you run =
rich, the=20
catcon has an abundance of fuel, which would cause it to overheat and =
fuse=20
it's internals.  Some catcons have an auxiliary air input from the AIR =
system=20
pump to provide additional oxygen to help combust unburned fuel, which =
would=20
help to raise their internal temperature even more under rich =
conditions.

I think this is a separate issue to exhaust gas temperature, which is=20
generally higher under lean burning conditions, and lower with rich.  =
The=20
catcon is capable of GENERATING heat greater than the incoming EGT if it =

has fuel to react with.  If you were running lean, EGT would be higher, =
but=20
heat generated in the catcon would be lower, and vice versa.  IMHO, the=20
change in exhaust gas temperature due to rich or lean would be much less =

than the change in catcon internal temperature under the same =
conditions.

The exhaust gasses consist mainly of the following TOXIC components =
before they reach the catalytic converter:

Hydrocarbons (unburnt fuel),
AND
Carbon monoxide,
Oxides of nitrogen.

Generally, a lean mixture will result in hotter exhaust gasses, =
producing more oxides of nitrogen. A catalytic converter functions =
between 300degc and 800degc, yemperatures in excess of 800degc lead to a =
drop i catalyst activity - thermal aging -  in the long run. At high =
temperatures the intermediate and precious metal layers fuse together or =
form large crystals (sintering or build up of mineral deposits). The =
result is a reduction in surface area and a drop in activity.=20

Fresh air injection assists the post ignition thermal reaction, =
resulting in exhaust fumes containing fewer hydrocarbons and carbon =
monoxide. This is usually used at start up ONLY, before the cat has =
reached its light off temperature (300degc).

Exhaust gas recirculation is used to reduce the levels of oxides of =
nitrogen in the exhaust. This happens through a reduction in combustion =
temperature, out of the range where NOX can be formed.=20

Also, some controll systems are able to monitor exhaust gas temperature =
by measuring the current which is supplied to the heated lamda probe in =
order to keep it at opperating temperature, adjusting fueling and =
ignition to compensate.


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