Changes in Small Engine Horsepower Ratings

[Pages:7]Changes in Small Engine Horsepower Ratings

The manufacturers of small engines have adjusted the horsepower that they state their engines make. All of the major manufacturers have now adopted using at least the SAE J1940 Standard 2012 Revision, to rate the horsepower output of their engines. The SAE International J1940 Standard was revised in October 2012 to provide a single method for determining small engine power and torque. This also allows us to accurately compare the power and torque of various engines.

The J1940 Standard utilizes SAE J1995 Standard to determine Gross horsepower and SAE J1349 to determine the net horsepower. The necessity of establishing both gross and net horsepower is due to the engine manufacturers supplying engines to various Original Equipment Manufacturers (OEMs) for end installation. It is common for the OEMs to install their own unique air intake, exhaust, and other accessories to the engine. This is combined with variety in engine speed settings and configurations have created a need for a more consistent method of testing the engine produced by the manufacturer.

The horsepower numbers for most manufacturers have changed, as they have gone to the more accurate method of rating the horsepower of their engines. The performance and output of the engines are unchanged, only the ratings have changed. Some manufacturers have introduced new model numbers, while some have only changed the labels on the engines. Due to this change in rated and stated engine horsepower, we have created this document to allow you to compare the new J1940 rating with the ratings that were previously stated by the manufacturers.

For more information regarding the changes and stated horsepower ratings, please visit the respective engine manufacturer websites.

NOTE:

Kawasaki Critical Power ratings utilize the SAE J2723 Standard for certifying output. This is the same way that automotive manufacturers certify horsepower. SAE J2723 uses either SAE J1995 Standard for gross horsepower or SAE J1349 for net horsepower. This is comparable to the other manufacturers' stated horsepower, but is more consistent and accurate in final applications.

Briggs and Stratton designates the gross output of engines it produces, whether it is by torque or horsepower, but also utilizes SAE J1940 Standard, in accordance with SAE J1995 for gross ratings.

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Honda Engines

Model

GX25 GX35 GXH50 GX100 GX120 GX160 GXV160 GX200 GX240 GX270 GX340 GX390 GXV340 GXV390 GX630 GXV630 GX660 GXV660 GX690 GXV690

GX Series

Previous Rating SAE J1940 Rating

1.1

1

1.6

1.3

2.5

2.1

3

2.8

4

3.5

5.5

4.8

5.5

4.3

6.5

5.5

8

7.9

9

8.5

11

10.7

13

11.7

11

8.9

13

10.2

20.3

20.8

20.3

20.8

21

21.5

21

21.5

22.3

22.1

22.3

22.1

Torque

0.74 1.2 2 4.2 5.4 7.6 7.1 9.1 13.5 14.1 19.5 19.5 15.9 17.8 35.6 35.6 35.6 35.6 35.6 35.6

Model

GC160 GC190 GCV160 GCV190

GC Series

Previous Rating SAE J1940 Rating

5

4.6

6

5.2

5.5

4.4

6.5

5.1

Torque

6.9 8.3 6.9 8.3

Model GS190 GSV190

GS Series

Previous Rating SAE J1940 Rating

6.5

5.2

6.5

5.1

Torque 8.3 8.3

2

Kawasaki Engines

Model

FR541V FR600V FR651V FR691V FR730V

FR Series

Previous Rating SAE J1940 Rating

18

15

20

18

22

21.5

24

23

26

24

Torque

31.7 32.4 39.3 39.5 39.7

Model

FS481V FS541V FS600V FS651V FS691V FS730V

FS Series

Previous Rating SAE J1940 Rating

16

14.5

18

15

20

18.5

22

22

24

23

26

24

Torque

30.9 31 32.5 39.4 39.9 40

Model

FX481V FX541V FX600V FX651V FX691V FX730V FX751V FX801V FX850V FX921V FX1000V FX921V-DFI FX1000V-DFI

FX Series

Previous

Rating

SAE J1940 Rating Torque

16

15.5

31.4

18

16.5

32.1

20

19

32.5

22

20.5

39

24

22

39.4

26

23.5

39.9

27

24.5

44.4

29

25.5

44.6

31

27

44.6

34

31

54.3

37

35

56

34

35

56.4

37

37

55.4

Model FD750D FD791D

FD Series

Previous Rating SAE J1940 Rating

27

25

29

26

Torque 41 40.5

3

Model

CH620 CH18/CH621

CH640 CH20/CH641

CH680 CH682 CH730 CH732 CH740 CH742 CH750 CH752 CH940 CH960 CH980 CH1000

Kohler Engines

Command Horizontal Series

Previous Rating

SAE J1940 Rating

18 See CH620

20 See CH640

23 See CH680

25 See CH730

27 See CH740

30 See CH750

34 36 38 40

19 19 20.5 20.5 22.5 22.5 23.5 23.5 25 25 27 27 32.5 Discontinued 35 37

Torque

35 32.2 35.7 32.7 36.8 38.9 38.4 40.4 39.2 41.2 41.2 42.2 53.5 N/A 54.5 55.3

Model

CV620 CV621/CV18

CV640 CV641/CV20 CV680/CV23

CV682 CV730 CV732 CV740 CV742 CV750 CV752 CV940 CV960 CV980 CV1000

Command Vertical Series

Previous Rating

SAE J1940 Rating

18 See CV620

20 See CV640

23 See CV680

25 See CV730

27 See CV740

30 See CV750

34 36 38

19 19 20.5 20.5 See CV682 22.5 See CV732 23.5 25 25 27 27 32.5 Discontinued 35

40

37

Torque

34 31.4 34.7 33.3 35.8 39 36.9 40.3 39.2 40.8 40.3 41.2 53.6 N/A 54.6 56.3

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Kohler Engines

Model

SV470 (Discontinued) SV471

SV480 (Discontinued) SV530

SV540 (Discontinued) SV541

SV590 (Discontinued) SV591

SV600 (Discontinued) SV601

SV610 (Discontinued) SV620 (Discontinued)

Courage Single Series

Previous Rating SAE J1940 Rating

15 See SV470

16 17 18 See SV541 19 See SV590 20 See SV600 21

See SV471 15 N/A 17

See SV541 18

See SV591 19

See SV601 20 N/A

22

N/A

Torque

N/A 27 N/A 31.5 N/A 32.1 N/A 33 N/A 34 N/A N/A

Model

Courage Twin Series Previous Rating 7000 Series Equivalent

SV710 (Discontinued)

20

SV715 (Discontinued)

22

SV720 (Discontinued)

23

SV725 (Discontinued)

24

SV730 (Discontinued)

25

SV735 (Discontinued)

26

SV740 (Discontinued)

27

SV810 (Discontinued)

20

SV820 (Discontinued)

23

SV830 (Discontinued)

25

SV840 (Discontinued)

27

See KT715 See KT725 See KT730 See KT735 See KT740 See KT745

N/A See KT715 See KT730 See KT740

N/A

Model

KT715 KT725 KT730 KT735 KT740 KT745

7000 Series SAE J1940 Rating

20 22 23 24 25 26

Torque

40.3 40.4 40.5 40.5 41.3 42.4

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