73-16
Emissions from a Suzuki Fronts GX Equipped
   with a Prototype 1975 Control Device
             February 1973
               Alan Whitmyer
        Test and Evaluation Branch
      Environmental Protection Agency

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 Background

 In late  November 1972,  U.S.  Suzuki  Corporation brought two
 cars  to  the  EPA facility in  Ann Arbor  for 1973 certification.
 Suzuki requested that the Test and  Evaluation Branch test one
 of the cars  with a device designed  to  make the car  meet the
 1975  standards.   The device  is designed to regulate the air/fuel
 ratio during accelerations by applying a vacuum to  the carburetor
 float bowl.   The length of time during which the vacuum is
 applied  is a function of the throttle  opening.   During cruise
 tonditions the  device has no effect.

 Vehicle  Description

 The test vehicle is a 1973 Suzuki with a 360 cc (21.9 cu.  in.)
 two-stroke engine and a manual transmission (4-speed).   The
 engine is a  water-cooled, 3-cylinder,  in-line,  two-stroke
 located  in the  rear of the car. The car has a two-door body
 with  a seating  capacity of four persons.   It is a right-hand
 drive vehicle.   Weight  is 1060 pounds.

 Test  Program

 All tests were  conducted as  specified  in the 1975 Federal Test
.Procedure (FTP).  A Beckman  402 flame  ionization detector was
 used  to  continuously monitor hydrocarbon emissions.   The sample
 for the  FID  was  taken immediately downstream of the dilution box.
 A heated sample  line was used and the  sample was drawn through
 a transverse probe located in the CVS  duct.   A total of four
 tests were run  on the car.   Inertia weight was  set  at 1500 pounds.

 In the first two tests  conducted on the car, it became evident
 that  the car was causing a severe interference problem with the
.Beckman  FID. Due to this interference  we were unable to obtain
 any useful information from  the first  two heated FID traces.

 The third test  was run with  the hood on the engine  compartment
 closed.   This eliminated the interference problem with the FID.
tAt this  point,  it became evident that  the Beckman 402 was badly
 in need  of an overhaul.   The remainder of the tests were conducted
 with  the FID built in-house  by our  laboratory personnel.

 The final two tests were conducted  with a moderate  degree of
 success.   During one test the CVS unit  did not begin sampling
 until approximately 60  seconds into Bag 1.  During  the next test
 no heated FID sample was taken for  Bag 3.

 Results

 The emission data obtained is shown in Tables I and II.  The
 vehicle  attained 1976 levels of NOx while failing to meet CO

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                             -2-
and HC requirements.  A steady deterioration of CO, CC>2,  and HC
occurred during the testing sequence.  Due to problems with the
FID and CVS sampling, no single test had complete bag results
for both systems.   The individual bag results are shown in
Table II.

Test #3 gave widely varying results, with bag 2 being much lower
for the heated FID and bag 3 results being much higher for the
FID.  In test #4,  the cold bag results were very close to the
hot FID results for bags 1 and 2.

Conclusions

Although NOx levels were well below 1976 standards, the vehicle
failed both HC and CO standards.

Due to a lack of valid tests, it  is not possible to say
whether or not the heated FID gives results that are sub-
stantially different from the cold bag results.  Because  of
the electrical interference generated by the engine in this
car, it is necessary to shield electrical components being
operated in the test cell when the car is being run.

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                          TABLE I

                       SUZUKI FRONTS GX
                Mass Emissions, Grams Per Mile
                 1975 Federal Test Procedure
            HC         HC            CO     NOx     C02
Test No. cold bag   hot cont.
16
16
16
16
-81
-89
-129
-133
1
0
-
. 1
.86
.74

.41
7
11
--invalid
14
.06
.00

.35
0.
0.

0.
22
21
-
21
372
381

391
.70
.12
-
.16
                          TABLE II

                     SUZUKI FRONTE GX
        Hydrocarbon Mass Emissions, Grams Per Mile
                 1975 Federal Test Procedure
                   (individual bag data)

           Bag 1                Bag 2               Bag 3
        cold   hot           cold    hot         cold    hot
Test #  bag	cont.	bag	cont.	bag	cont
16-
16-
•16-
16-
81
89
129
133
2
2
-
2
.84
.90
	
.13 2.14
0.
0.
0.
0.
15
05
23
08
	
	
.055
0.10
0.
0.
0.
3.
71
43
63
38
	
	
2.23
	

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