The purpose of any catalytic converter is to reduce
harmful emissions from the exhaust of a ''properly tuned''
combustion engine. It accomplishes this through a combination of
heat and a precious metal catalyst that causes the harmful
emissions to either oxidize or reduce to safe elements in the
exhaust flow. If the engine is out of tune and not calibrated to
OEM specs, the catalytic converter's efficiency is greatly
diminished and could lead to a converter failure.
The precious metal catalyst is bound to an extruded
ceramic honeycomb substrate. The ceramic has hundreds of flow
channels that allow the exhaust gasses to come in contact with a
maximum amount of surface area where the catalyst reaction takes
place. The catalyst must come in direct contact with the exhaust
gasses for the reaction to take place.
If the ceramic inside your converter becomes clogged or
coated with carbon, lead or oil, then the converter's efficiency is
There are three basic types of automotive catalytic
converters: Two-Way, Three-Way and Three-Way-Air. Each type uses a
slightly different method and chemistry to reduce the harmful
elements in exhaust emissions. Early model converters used a
pelletized catalyst, but most modern converters are now designed
with a free-flowing honeycomb ceramic catalyst. The type of
converter required on a particular vehicle varies with model year,
engine size and vehicle weight. Some vehicles use more than one
type of converter to meet emission reduction standards.
Two-Way Oxidation Converter
Two-Way converter, used on cars between 1975-1980, oxidizes
unburned harmful hydrocarbons and carbon monoxide along with
secondary oxygen into water and carbon dioxide. HC, CO, O2 OXIDIZE
TO H20 and CO2
A Three-Way converter is a triple purpose converter. It reduces
nitrous oxides into nitrogen and, like the two-way converter, it
oxidizes unburned harmful hydrocarbons and turns carbon monoxide
into water and carbon dioxide. NOx REDUCES TO N2 HC, CO OXIDIZES TO
H20 and CO2
Three-Way+Air Reduction/Oxidation Converter
A Three-Way-Air converter performs the same function as the
Three-Way converter: It oxidizes and reduces. The difference is the
addition of secondary air between the two internal catalyst
substrates that improves the oxidation capabilities of the
converter. The secondary air is pumped into the middle of the
converter between the two separate catalyst substrates. The front
performs the reduction and the back ceramic performs the oxidation.
It's like having two converters in one.
Note: These catalytic converters are no longer
legal for sale in the state of California and will not be shipped
to the state of California.
Round Catalytic Converter
- 2.5'' Inlet/Outlet Diameter
- 15'' Overall Length
- 11'' Body Length
- 5.125'' Wide
- O2 Sensor