Document ID: EPA-HQ-OAR-2004-0008-0914
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2008-09-09T04:00Z

September 2, 2008

TO:  Docket  # EPA-HQ-OAR-2004-008

FROM:  Cheryl Caffrey

RE:  Comparison of Calculations for Part 90 and Part 1065 Using
Nonhandheld and Handheld Industry Provided Data.

This memo outlines the 1065 calculations for Small SI engines and
compares the results to Part 90 results.  This was done using emission
test data and calculated part 90 results from the nonhandheld and
handheld industry associations (EMA and OPEI).  EPA used that data to
verify the part 90 equations from industry and then calculate results
using the part 1065 equations.  EMA provided two datasets from raw
emission measurement method and OPEI provided one dataset from raw
emission measurement and one from the CVS method.  Table 1 below shows
the comparison results for the various calculation methods.  Tables 2-
11 contain a listing of the input data, and 1065 equations used to
calculate the emission results.  The Appendix contains the modal
comparison of the Part 90 and 1065 results.

Table 1:  Comparison of Dry-to-Wet Corrected Part 90 and Part 1065 Mass
Rate Emission Calculations* (g/hr values compared)

 	HH Raw	HH CVS**	NHH Raw Test 1	NHH Raw Test 2

HC***	-2.51%	-2.78%	-2.19%	-2.28%

NOx	0.29%	-0.13%	0.41%	0.32%

CO	0.23%	0.28%	0.22%	0.22%

NOTES:

*Negative value denotes the 1065 calculated mass rate emission value
being less than the Part 90 calculated mass rate emission value.

**For accurate comparison to Part 1065, the Part 90 dilute CO and CO2
measurements were dry-to-wet corrected to account for water removed
before measurement.  Part 90 does not require nor prevent performing
this correction.

*** The difference in test results for HC when using the Part 90
calculated molecular weight hydrocarbon in 1065 is as follows: 0.10% HH
Raw, -0.17% for HH CVS, 0.40 for NHH Test 1, and 0.32 for NHH Test 2. 
These are much lower than when using the assigned value in 1065, Table
655-1.Calculation Spreadsheet with Referenced equations for Nonhandheld
Test Data Set #1

Table 2:  Inputs from Industry data.  

Emission (g/kWhr) results are found in Table 4.  Explicit 1065 equations
are in tables following.

Note:  Data from current Part 90 can be utilized in the 1065 equations.

1065 Equation

Operation

Variable	Input	Input	Input	Input	Input	Input	Input	Input	Input

	Weighting 

Factor	Engine 

Speed	Brake 

Torque	Fuel Rate	H:C ratio	O:C ratio	Ambient Pressure of

Intake and Dilution

or Excess Air	Temp at RH 

Meas of Intake 

and Dilution Air	Relative Humidity

of Intake and

		pamb	Tint&dil	RHint&dil

Units	#	rpm	lbf-ft	g/hr	mol/mol	mol/mol	kPa	C	%

6	0.090	3060	7.06	1237.8536	1.923	0.018	98.64964071	20.555556	46.30%

7	0.200	3092	5.3	981.1203	1.923	0.018	98.6157754	20.555556	47.40%

8	0.290	3081	3.54	691.72837	1.923	0.018	98.6157754	20.555556	45.40%

9	0.300	3057	1.77	498.95161	1.923	0.018	98.6157754	20.555556	45.50%

10	0.070	3053	0.73	427.73761	1.923	0.018	98.6157754	20.555556	47.60%

11	0.050	2075	0.14	257.64047	1.923	0.018	98.6157754	20.555556	49.70%

Table 3: Inputs from Industry data (continued).

Operation

Variable	Input	Input	Input	Input	Input	Input	Input	Input

	Amount of CO2 in 

intake and dilution

or excess air 

meas by analyzer	Absolute Pressure at the outlet of the

emissions analyzer

chiller	Temp at Outlet

of Emissions 

Analyzer Chiller	Amount of CO2

in exhaust meas

by CO2 analyzer	Amount of Total

HC in exhaust

meas by THC 

analyzer	Amount of CO 

in exhaust meas

by CO analyzer	Amount of NO

or Nox in exhaust

meas by NO or Nox

analyzer	Amount of NO2

in exhaust meas

by NO2 analyzer,

mol/mol	kPa	C	%	mol/mol	%	mol/mol	mol/mol

6	375.00	93.12959559	7.00	9.19%	2941	8.12%	251.78	0.00

7	375.00	93.12959559	7.00	9.24%	2689	7.79%	203.87	0.00

8	375.00	93.12959559	7.00	10.25%	2581	5.90%	203.8	0.00

9	375.00	93.12959559	7.00	10.64%	2504	5.07%	99.72	0.00

10	375.00	93.12959559	7.00	10.28%	2540	5.52%	69.67	0.00

11	375.00	93.12959559	7.00	8.41%	8374	7.85%	26.19	0.00



Table 4: Calculations and results (see center bottom rows)

	Amount of dilution or excess air per amount of dry exhaust

1065 Equation	Part of New H2 Equation	650-12	650-12	650-12	650-12	650-12
655-1	655-2	655-3

Operation

Variable	1065 Constant	Explicit Calc	Explicit Calc	Explicit Calc
Explicit Calc	Explicit Calc	Explicit Calc	Explicit Calc	Explicit Calc

	Water-gas 

reaction equilibrium

Coefficient	Mass Rate

of CO2	Mass Rate

of CO	Mass Rate 

of THC	Mass Rate of NOx 

before intake

air humidity

correction	Mass Rate of NOx 

after intake air

humidity

correction	Amount of

dilution or 

excess air

in exhaust	Amount of

water in

exhaust	Amount of C1

combustion

products per amt

of dry exhaust

Mode	KH2O-gas	mdotCO2	mdotCO	mdotTHC	mdotNOxuncorrected	mdotNOxcorrected
xdil/exh	xH2Oexh	xCombdry

Units

g/hr	g/hr	g/hr	g/hr	g/hr	mol/mol	mol/mol	mol/mol

6	3.50	1997.381374	1123.2327	22.790216	6.469031062	6.113146055
0.033827151	0.12522457	17.80%

7	3.50	1620.148912	869.3379622	16.801965	4.223642854	4.002790316
0.043655316	0.12477806	17.48%

8	3.50	1336.071076	489.4698361	12.007444	3.143629373	2.963902164
0.055087972	0.12612838	16.58%

9	3.50	1028.546889	311.9310815	8.6386896	1.140671	1.075735147
0.064004645	0.12607647	16.13%

10	3.50	846.9203667	289.4388106	7.4618595	0.678615461	0.643462259
0.068257729	0.12533727	16.22%

11	3.50	390.2522875	231.8394528	13.746273	0.142545031	0.135891749
0.086252297	0.1183383	17.35%

g/kW-hr	g/kW-hr	g/kW-hr	g/kW-hr	g/kW-hr

	884.75	375.28	8.784	1.89	1.79

	CO2	CO	THC	 	Nox

	Table 5:  Iterative and Explicit 1065 calculations (Excel 2007 can be
used to perform this iterative step)

	1065 Equation

655-4

655-4

655-5

655-6

655-7

655-8

655-9

Operation

Variable

Iterative Calc

Iterative Calc

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Iterative Guess 

value of the amt

of water per

amt of dry exh

Iterative Recalculate

value of the amt

of water per

amt of dry exh

Amount of 

dilution or excess

air per amt of 

dry exhaust

Amount of intake

air consumed

per amount of

dry exhaust

Amount of stoichiometric

exhaust per amt

of dry exhaust

Amount of 

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mol/mol

6

0.143150538

0.143150538

0.038669526

0.956546973

1.104481012

20.71%

374.77

7

0.142567337

0.142567337

0.049879138

0.949010755

1.092688199

20.70%

374.67

8

0.144332846

0.144332846

0.063038976

0.956939367

1.08129387

20.71%

374.85

9

0.144264873

0.144264873

0.073238267

0.955181558

1.071026606

20.71%

374.84

10

0.143297831

0.143297831

0.078038914

0.945495911

1.065258917

20.70%

374.65

11

0.134221888

0.134221888

0.097829243

0.889153959

1.036392645

20.69%

374.45

	

Table 6:  Explicit 1065 Calculations (continued)

1065 Equation

655-10

655-11

655-12

655-13

655-14

655-15

655-16

655-17

Operation

Variable

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Explicit Calculation

Amount of water

in intake air per

amount of dry

intake air

Amount of 

CO2 in 

dilution or

excess air

Amount of water 

in dilution or

excess air per amt

of dry dilution air

Amount of CO 

in exhaust per

amount of dry

exhaust

Amount of CO2 

in exhaust per

amount of dry

exhaust

Amount of NO 

or Nox in exhaust

per amount

of dry exhaust

Amount of NO2 

in exhaust per

amount of dry

exhaust

Amount of THC 

in exhaust per

amount of dry 

exhaust

Mode

xH2Ointdry

xCO2dil

xH2Odildry

xCOdry

xCO2dry

xNOdry

xNO2dry

xTHCdry

Units

%

mol/mol

%

%

%

mol/mol

mol/mol

mol/mol

6

1.15%

374.77

1.15%

8.21%

9.29%

287.82

0.00

3362.01

7

1.18%

374.67

1.18%

7.87%

9.34%

232.94

0.00

3072.36

8

1.13%

374.85

1.13%

5.96%

10.36%

233.22

0.00

2953.52

9

1.13%

374.84

1.13%

5.13%

10.76%

114.11

0.00

2865.24

10

1.18%

374.65

1.18%

5.58%

10.39%

79.65

0.00

2903.98

11

1.23%

374.45

1.23%

7.94%

8.50%

29.71

0.00

9497.97

Table 7:  Explicit 1065 Calculations (continued)

	

1065 Equation	655(c)(1)	655(c)(1)	New Equation	659-1	659-1	659-1	659-1
659-1

Operation Variable	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation	Explicit Calculation

	Amount of CO2 

in intake air per

amount of dry

intake air	Amount of CO2 

in dilution or 

excess air per amt

of dry dilution air	Amount of H2 

in exhaust per

amount of dry

exhaust	Amount of CO2 

in exhaust	Amount of THC 

in exhaust	Amount of CO 

in exhaust	Amount of NO 

or Nox in 

exhaust	Amount of NO2

in exhaust, if

measured

Mode	xCO2intdry	xCO2dildry	xH2dry	xCO2exh	xTHCexh	xCOexh	xNOexh	xNO2exh

Units	mol/mol	mol/mol	mol/mol	%	mol/mol	%	mol/mol
mol/mol

6	379.08	379.08	36032.91	8.13%	2941.00	7.18%	251.78	0.00

7	379.08	379.08	34208.52	8.17%	2689.00	6.89%	203.87	0.00

8	379.08	379.08	23626.92	9.05%	2581.00	5.21%	203.80	0.00

9	379.08	379.08	19534.50	9.40%	2504.00	4.48%	99.72	0.00

10	379.08	379.08	21850.92	9.09%	2540.00	4.88%	69.67	0.00

11	379.08	379.08	35492.81	7.50%	8374.00	7.00%	26.19	0.00



Table 8:  Explicit 1065 Calculations (continued)

1065 Equation	670-1	1005(f)(2)	1005(f)(2)	1005(f)(2)	1005(f)(2)
1005(f)(2)	1005(f)(2)	1005(f)(2)	650-13

Operation Variable	Explicit Calculation	1065 Constant	1066 Constant	1067
Constant	1068 Constant	1069 Constant	1070 Constant	1071 Constant
Explicit Calc

	Amount of NOx in

in exh equivalent

after correcting for

intake air humidity	Molar Mass

of Carbon	Molar Mass 

of atomic

Hydrogen	Molar Mass

of atomic

Oxygen	Molar Mass 

of CO2	Molar Mass 

of CO	Molar Mass 

of THC according

Part 1065	Molar Mass 

of Nox 

defined 

mol/mol	g/mol	g/mol	g/mol	g/mol	g/mol	g/mol	g/mol	hp

6	237.93	12.0107	1.01	15.9994	44.0095	28.0101	13.875389	46.0055	4.11

7	193.21	12.0107	1.01	15.9994	44.0095	28.0101	13.875389	46.0055	3.12

8	192.15	12.0107	1.01	15.9994	44.0095	28.0101	13.875389	46.0055	2.08

9	94.04	12.0107	1.01	15.9994	44.0095	28.0101	13.875389	46.0055	1.03

10	66.06	12.0107	1.01	15.9994	44.0095	28.0101	13.875389	46.0055	0.42

11	24.97	12.0107	1.01	15.9994	44.0095	28.0101	13.875389	46.0055	0.06



Table 9:  Explicit 1065 Calculations (continued)

1065 Equation	650(a) 	655(c) 	655-19	1065.20(a)(3)	645-1	645-4	Assumed
same as intake	1065.20(a)(3)

Operation Variable	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation	Explicit Calculation

	Weighted

Brake Power (refer to standard setting part)	Part 90 

Calculation

Allowed – use other than default in Table 655-1	Mole rate of 

dry exhaust

determined

via fuel flow	Ambient Temp of Intake

and dilution or excess

air at ambient 

humidity meas local	Partial Pressure 

of water in 

intake & dilution

or excess air	Amount of

water in 

intake air	Amount of 

water in any

dilution or 

excess air	Abs Temp 

the outlet of 

the emissions

analyzers chiller

Mode	Pweighted	wc	ndotexhbyfuel	Tamb	pH2Oamb	xH2Oint	xH2Odil	Tchiller

Units	hp	g/g	mol/hr	K	kPa	%	%	K

6	0.3702	0.8436283	558.480807	293.7055556	2.418725003	1.1352%	1.1352%
280.15

7	0.6240	0.8436283	450.32298	293.7055556	2.418725003	1.1626%	1.1626%
280.15

8	0.6022	0.8436283	335.287531	293.7055556	2.418725003	1.1135%	1.1135%
280.15

9	0.3091	0.8436283	248.638499	293.7055556	2.418725003	1.1160%	1.1160%
280.15

10	0.0297	0.8436283	211.723071	293.7055556	2.418725003	1.1675%	1.1675%
280.15

11	0.0028	0.8436283	118.306016	293.7055556	2.418725003	1.2190%	1.2190%
280.15



Table 10:  Explicit 1065 Calculations (continued)

1065 Equation	645-1	645-4	659(b)(4)	655(c)(1)	145(d)(2)	655(c)(1)
655(c)(1)

Operation Variable	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation

	partial pressure 

of water at 

outlet of emissions

analyzer chiller	Amount of water 

in emissions

sample downstream

of chiller	Amount of water 

in exhaust 

emissions sampler

to CO2 analyzer	Amount of water

in emissions 

sample to THC

analyzer	Amount of water 

in emissions 

sample to CO

analyzer	Amount of water 

in emissions 

sample to NO or

Nox analyzer	Amount of water 

in emissions 

sample to NO2

analyzer, if meas

Mode	pH2Ochiller	xH2Ochiller	xH2OCO2meas	xH2OTHCmeas	xH2OCOmeas
xH2ONOmeas	xH2ONO2meas

Units	kPa	%	%	%	%	%	%

6	1.001202906	1.0751%	1.0751%	12.5225%	1.0751%	12.5225%	12.5225%

7	1.001202906	1.0751%	1.0751%	12.4778%	1.0751%	12.4778%	12.4778%

8	1.001202906	1.0751%	1.0751%	12.6128%	1.0751%	12.6128%	12.6128%

9	1.001202906	1.0751%	1.0751%	12.6076%	1.0751%	12.6076%	12.6076%

10	1.001202906	1.0751%	1.0751%	12.5337%	1.0751%	12.5337%	12.5337%

11	1.001202906	1.0751%	1.0751%	11.8338%	1.0751%	11.8338%	11.8338%



Table 11:  Explicit 1065 Calculations (continued)

1065 Equation	659(b)(4)	659(b)(4)	Equal to input	Assumed same as intake

Operation Variable	Explicit Calculation	Explicit Calculation	Explicit
Calculation	Explicit Calculation

	Amount of water 

in intake air

sample to CO2

analyzer	Amount of water 

in dilution or excess

air sample to CO2

analyzer	Amount of CO2

measured in

intake air	Amount of CO2 

measured in 

dilution or 

mol/mol	mol/mol

6	1.0751%	1.0751%	375.00	375.00

7	1.0751%	1.0751%	375.00	375.00

8	1.0751%	1.0751%	375.00	375.00

9	1.0751%	1.0751%	375.00	375.00

10	1.0751%	1.0751%	375.00	375.00

11	1.0751%	1.0751%	375.00	375.00

End of equations

APPENDIX

Nonhandheld and Handheld Part 90 and Part 1065 Comparisons using
Industry DataNONHANDHELD DATA

Two sets of raw emission data were obtained from the nonhandheld (NHH)
industry association (EMA).

NOTES for nonhandheld calculations:

*Note that the difference in percent error between mass rate and brake
specific calculations are due to difference in the number of significant
figures used for power in the brake specific calculation.

**Note that in the 1065 calculations , we assume a chiller temperature
of 7 °C with an absolute pressure of 93 kPa.

*** Note that the HC calculations for both Part 90 and 1065 are using
the prescribed molecular weight of hydrocarbon (MWHC) value of 13.875389
from Part 1065.

****Note that the large error here is due to an error in the Kh
calculation for the Part 90 data results as submitted by EMA.

*****The comparison of the Part 1065 to Part 90 data here is done using
the EPA calculated Part 90 results due to the error in Kh determination
for the data results provided by EMA.

Table A1: NHH - Hydrocarbon Comparison

Small SI Comparison to Part 90 - EMA Submitted Data TEST 1

	Mode 6 only

Mode	Part 90 EMA WHC (g/hr)	Part 90 EPA WHC (g/hr)	Part 1065 WHC (g/hr)
HC % Difference (EMA90/EPA90)	HC % Difference (1065/90)

6	23.29	23.29	22.79	-0.0070%	-2.1876%

7	17.16	17.17	16.80	-0.0070%	-2.1676%

8	12.27	12.27	12.01	-0.0070%	-2.2147%

9	8.83	8.83	8.64	-0.0070%	-2.2177%

10	7.62	7.62	7.46	-0.0070%	-2.1725%

11	14.04	14.04	13.75	-0.0070%	-2.1471%

Composite (g/hr)	12.97	12.97	12.69	-0.0070%	-2.1931%

Composite (g/kW-hr)	8.98	8.98	8.78	-0.0090%	-2.2031%

	Small SI Comparison to Part 90 - EMA Submitted Data TEST 2

	Mode 6 only

Mode	Part 90 EMA WHC (g/hr)	Part 90 EPA WHC (g/hr)	Part 1065 WHC (g/hr)
HC % Difference (EMA90/EPA90)	HC % Difference (1065/90)

6	24.95	24.95	24.39	-0.0070%	-2.2740%

7	20.51	20.51	20.06	-0.0070%	-2.2807%

8	18.98	18.98	18.56	-0.0070%	-2.2992%

9	17.91	17.91	17.52	-0.0070%	-2.2599%

10	11.57	11.58	11.32	-0.0070%	-2.2779%

11	7.58	7.58	7.41	-0.0070%	-2.3052%

Composite (g/hr)	18.41	18.42	18.01	-0.0070%	-2.2797%

Composite (g/kW-hr)	6.26	6.26	6.12	-0.0090%	-2.2851%

Table A2: NHH - CO Comparison

Small SI Comparison to Part 90 - EMA Submitted Data TEST 1

Mode	Part 90 EMA WCO (g/hr)	Part 90 EPA WCO (g/hr)	Part 1065 WCO (g/hr)
CO % Difference (EMA90/EPA90)	CO % Difference (1065/90)

6	1120.89	1120.97	1123.23	-0.0070%	0.2017%

7	867.49	867.55	869.34	-0.0070%	0.2061%

8	488.34	488.38	489.47	-0.0070%	0.2236%

9	311.18	311.21	311.93	-0.0070%	0.2322%

10	288.76	288.78	289.44	-0.0070%	0.2287%

11	231.37	231.39	231.84	-0.0070%	0.1953%

Composite (g/hr)	541.13	541.17	542.34	-0.0070%	0.2150%

Composite (g/kW-hr)	374.44	374.47	375.24	-0.0090%	0.2052%

	

Small SI Comparison to Part 90 - EMA Submitted Data TEST 2

Mode	Part 90 EMA WCO (g/hr)	Part 90 EPA WCO (g/hr)	Part 1065 WCO (g/hr)
CO % Difference (EMA90/EPA90)	CO % Difference (1065/90)

6	1849.32	1849.45	1853.35	-0.0070%	0.2104%

7	1434.31	1434.41	1437.48	-0.0070%	0.2135%

8	1088.98	1089.05	1091.43	-0.0070%	0.2180%

9	1088.15	1088.23	1090.53	-0.0070%	0.2115%

10	557.04	557.08	558.47	-0.0070%	0.2490%

11	268.77	268.79	269.55	-0.0070%	0.2808%

Composite (g/hr)	1147.98	1148.06	1150.54	-0.0070%	0.2157%

Composite (g/kW-hr)	390.28	390.31	391.14	-0.0090%	0.2105%

 

Table A3: NHH - NOx and Kh Comparison 

Small SI Comparison to Part 90 - EMA Submitted Data TEST 1

Mode	Part 90 EMA WNOx*Kh (g/hr)	Part 90 EPA WNOx*Kh (g/hr)	Part 1065
WNOx*Kh (g/hr)	NOx*Kh % Difference (EMA90/EPA90)	NOx*Kh % Difference
(1065/90)	Weighting	Part 1065 Power (kW)

6	6.0888	6.0879	6.11	0.0142%	0.4132%	0.09	3.067

7	3.9860	3.9855	4.00	0.0147%	0.4331%	0.2	2.327

8	2.9529	2.9524	2.96	0.0139%	0.3865%	0.29	1.549

9	1.0718	1.0716	1.08	0.0139%	0.3836%	0.3	0.768

10	0.6408	0.6407	0.64	0.0148%	0.4284%	0.07	0.316

11	0.1353	0.1353	0.14	0.0156%	0.4539%	0.05	0.041

Composite (g/hr)	2.5747	2.5743	2.58	0.0142%	0.4072%

Composite (g/kW-hr)	1.7815	1.7813	1.79	0.0122%	0.3974%

Small SI Comparison to Part 90 - EMA Submitted Data TEST 2

Mode	Part 90 EMA WNOx*Kh (g/hr)	Part 90 EPA WNOx*Kh (g/hr)	Part 1065
WNOx*Kh (g/hr)	NOx*Kh % Difference (EMA90/EPA90)****	NOx*Kh % Difference
(1065/90)*****	Weighting	Part 1065 Power (kW)

6	17.65	17.45	17.51	1.1493%	0.3318%	0.09	6.278

7	13.63	13.42	13.47	1.5132%	0.3246%	0.2	4.692

8	5.75	5.68	5.69	1.2271%	0.3056%	0.29	3.154

9	1.72	1.70	1.71	0.9686%	0.3443%	0.3	1.586

10	1.42	1.40	1.41	1.4862%	0.3269%	0.07	0.670

11	0.51	0.50	0.50	2.5025%	0.2963%	0.05	0.015

Composite (g/hr)	6.62	6.54	6.56	1.3145%	0.3230%

Composite (g/kW-hr)	2.25	2.22	2.23	1.3124%	0.3178%

 

Handheld Data (OPEI)

One set data from raw emission measurement and one set of emission data
obtained with the CVS method were obtained from the handheld (HH)
industry association.

NOTES:  

*Note that the difference in percent error between mass rate and brake
specific calculations are due to difference in the number of significant
figures used for power in the brake specific calculation.

**Note that in the 1065 calculations, we assume a chiller temperature of
7 °C with an absolute pressure of 93 kPa.

*** Note that the HC calculations for both Part 90 and 1065 are using
the prescribed molecular weight of hydrocarbons (MWHC) value of
13.875389 from Part 1065.

****Note that Part 90 dilute data is not dry to wet corrected for CO and
CO2, while Part 1065 data is.

Table A4:  HH - HC Comparison

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HC % Difference (1065/90)

1	545.53	545.54	530.78	-0.0016%	-2.7812%

Idle	90.81	90.81	88.34	-0.0003%	-2.7881%

Composite (g/hr)	477.32	477.33	464.41	-0.0016%	-2.7814%

Composite (g/kW-hr)	118.30	118.30	115.11	-0.0001%	-2.7737%

Table A5:  HH - CO Comparison

Small SI Comparison to Part 90 - EMA Handheld  Submitted Data Raw Test

Mode	Part 90 EMA WCO (g/hr)	Part 90 EPA WCO (g/hr)	Part 1065 WCO (g/hr)
CO % Difference (EMA90/EPA90)	CO % Difference (1065/90)

1	2274.58	2274.57	2279.65	0.0005%	0.2231%

Idle	108.93	108.93	109.42	0.0001%	0.4501%

Composite (g/hr)	1949.73	1949.72	1954.12	0.0005%	0.2250%

Composite (g/kW-hr)	505.42	505.42	506.56	0.0004%	0.2250%

	Small SI Comparison to Part 90 - EMA Handheld Submitted Data Dilute
Test 

With Part 90 and 1065 Dry-to-Wet Correction

Mode	Part 90 EMA WCO (g/hr)	Part 90 EPA WCO (g/hr)	Part 1065 WCO (g/hr)
CO % Difference (EMA90/EPA90)	CO % Difference (1065/90)

1	1833.56	1828.36	1833.39	0.2849%	0.2744%

Idle	73.70	73.65	74.51	0.0658%	1.1649%

Composite (g/hr)	1569.58	1565.15	1569.56	0.2833%	0.2807%

Composite (g/kW-hr)	389.00	389.00	389.02	0.0000%	0.0058%

Table A6:  HH - NOx and Kh Comparison

Small SI Comparison to Part 90 - EMA Handheld  Submitted Data Raw Test

Mode	Part 90 EMA WNOx (g/hr)	Part 90 EPA WNOx (g/hr)	Part 1065 WNOx
(g/hr)	NOx % Difference (EMA90/EPA90)	NOx % Difference (1065/90)
Weighting	Part 1065 Power (kW)

1	2.2582	2.2584	2.2649	-0.0112%	0.2849%	0.85	4.538

Idle	0.0634	0.0634	0.0637	-0.0678%	0.3515%	0.15	0.000

Composite (g/hr)	1.929	1.9292	1.9347	-0.0114%	0.2852%

Composite (g/kW-hr)	0.5000	0.5001	0.5015	-0.0188%	0.2852%

	Small SI Comparison to Part 90 - EMA Handheld Submitted Data Dilute
Test

With Part 90 and 1065 Dry-to-Wet Correction

Mode	Part 90 EMA WNOx (g/hr)	Part 90 EPA WNOx (g/hr)	Part 1065 WNOx
(g/hr)	NOx % Difference (EMA90/EPA90)	NOx % Difference (1065/90)
Weighting	Part 1065 Power (kW)

1	4.33	4.33	4.33	0.0009%	-0.1229%	0.85	4.747

Idle	0.06	0.06	0.06	0.0000%	-2.8025%	0.15	0.000

Composite (g/hr)	3.69	3.69	3.69	0.0009%	-0.1291%

Composite (g/kW-hr)	0.91	0.91	0.91	0.0000%	-0.1224%