Catalysts
and
Lawnmowers
Catalysts
and
Lawnmowers
Air
Resources
Board
Air
Resources
Board
October
5,
2005
October
5,
2005
Proven
Technology
Proven
Technology
Several
engines
tested
at
SwRI
Several
engines
tested
at
SwRI
Significant
emission
reductions:
50%

Significant
emission
reductions:
50%­
80%

80%

Catalyst's
impact
on
temperature:
Minor
Catalyst's
impact
on
temperature:
Minor
Air
Resources
Board
California
Environmental
Protection
Agency
Equipment
with
Catalysts
Equipment
with
Catalysts
Original
Muffler
Muffler
with
Cat
Original
Muffler
Muffler
with
Cat
Muffler
with
Cat
Original
Muffler
Air
Resources
Board
California
Environmental
Protection
Agency
Catalyst
Efficiency
Catalyst
Efficiency
0
10
20
30
40
50
60
70
80
90
B&
S
#
1
B&
S
#
2
Tecum.
Hon.
#
1
Hon.
#
2
Kawa.

%

Efficiency
0
hour
125
hour
250
hour
500
hour
Target
Level
Air
Resources
Board
California
Environmental
Protection
Agency
Muffler
Surface
Temperatures
Muffler
Surface
Temperatures
0
200
400
600
800
1000
1200
B&
S
#
2
Tecum.
Hon.
#
1
Kawa.
Hon.
#
2
Degrees
Fahrenheit
w/
o
Cat
w/
Cat
Cat
w/
shield
Air
Resources
Board
California
Environmental
Protection
Agency
Wide
Open
Throttle
Full
Load
Problems
and
Solutions
Problems
and
Solutions
Risk
of
skin
burns
Risk
of
skin
burns
Engines
less
durable
Engines
less
durable
Fire
from
spillage
or
Fire
from
spillage
or
ignition
of
clippings
ignition
of
clippings
Shielding
of
hot
parts
Shielding
of
hot
parts
Proper
exhaust
flow
Proper
exhaust
flow
Controlling
surface
Controlling
surface
temperatures
temperatures
Air
Resources
Board
California
Environmental
Protection
Agency
Problems
and
Solutions
Problems
and
Solutions
Boiling
of
fuel
Boiling
of
fuel
Flames
from
catalyst
Flames
from
catalyst
Proper
layout
of
fuel
Proper
layout
of
fuel
lines
and
components
lines
and
components
Extreme
conditions
Extreme
conditions
Use
spark
arrestor
Use
spark
arrestor
Air
Resources
Board
California
Environmental
Protection
Agency
Conclusions
Conclusions
Solutions
exist
to
address
safety
issues
Solutions
exist
to
address
safety
issues
Further
study
should
follow
U.
S.
EPA's
Further
study
should
follow
U.
S.
EPA's
recommendations
recommendations
 
All
All­
inclusive
"
Steering
Committee"

inclusive
"
Steering
Committee"

 
Committee
to
have
full
access
and
Committee
to
have
full
access
and
substantive
voice
substantive
voice
 
Study
conducted
openly
and
transparently
Study
conducted
openly
and
transparently
Air
Resources
Board
California
Environmental
Protection
Agency
