74-6 RBM
  Evaluation of the SCATPAC Device
             July 1973
Emission Control Technology Division
Office of Air and Wa.ter Programs
Environmental Protection Agency

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Background

The ECT Division was contacted by a representative of Cedar
Rapids Engineering Company, of Cedar Rapids, Iowa, concerning
their retrofit device for automobiles called SCATPAC.  After
being shown test results performed by Olson Laboratories
which showed significant reductions of CO, HC, and NOx on a
vehicle with the device installed (as compared to baseline),
the ECTD agreed to perform testing of the device on an EPA
owned vehicle.

Device Tested

SCATPAC is a vacuum vapor induction system which is attached
to the PCV line.  Manifold vacuum draws air through a liquid
solution of undisclosed chemicals into the base of the car-
buretor.  Vapors from the solution are thus introduced into
the manifold.  The device comes with all necessary components
for the retrofitting to any vehicle with a PCV line and
installation time takes less than fifteen minutes.

Test Program

A 1970 Plymouth Valiant 225 CID from the EPA fleet was used
for the test program.  Four emission tests* were conducted,
two without the device and two with the device installed.
Before any testing, the vehicle was tuned to the manufacturer's
specifications for timing and idle rpm.  Idle CO, 1.75%, was
not changed.  Two tests were then conducted in this stock
configuration to be used as the baseline results.  The SCATPAC
device was then installed and idle CO was adjusted to 1.751
so that the enleanment effect from bleeding the vapors into
the PCV line did not influence the emissions (it had dropped
to about 1.501).  The vehicle was then tested twice more.

Test Results

The test results are presented in the Appendix of this report,
and are summarized below.  In addition to emission results,
fuel economy was calculated for each test using a carbon
balance technique.
*A11 testing was performed according to the 1975 Federal Test
Procedure as outlined in the November 15, 1972, Federal Register
for light duty vehicles.

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                              -2-
                   Summary of Test Results
                  % Decrease from Baseline

              HC                          2%
              CO                         -9%  (increase)
              NOx                        11%
              MPG                        -1%  (increase)
Conclusions

The minor increase in carbon monoxide accompanied by a minor
decrease in oxides of nitrogen may reflect a change in the
overall air/fuel ratio.

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                              APPENDIX
Baseline
SCATPAC
Test
No.
16-530
16-531
Avg.
16-542
16-547
Avg.
HC
gpm
2.07
2.12
2.10
2.17
1.94
2.05
CO
gpm
29.12
29.16
29.14
33.98
30.17
32.07
C02
gpm
357.5
354.1
355.8
352.1
341.3
346.7
NOx
gpm
5.44
5.74
5.59
5.31
4.73
5.02
Fuel
Economy
mpg
21.3
21.4
21.3
21.2
21.8
21.5

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