Ducati Cam Specs

Latest revision: April ’07 999R ’05, 1098 Nov ’04 – valve sizes, Vee Two 1000 ds, ST3 and 749 added

A collection of std cam timing figures as given in the Ducati specifications, plus some aftermarket cam timing for cams from Vee Two and Schrick.  I’ll separate the 2V and 4V (into Desmoquattro and Testastretta), and clarify some of the 4V cam fitments, especially for the Testastretta models.

2V Cams.  All timing is given at 1mm clearance (or 1mm lift without any clearance)

 

 

 

 

 

DURATION

CENTRELINE

LOBE

OVER

LIFT

 

VALVES

 

CAM

I O

I C

E O

E C

IN

EXH

INLET

EXH

SEP

LAP

INLET

EXH

INLET

EXH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

600, 750

12

70

56

25

262

261

119

105.5

112

37

9.35

8.5

33.5/41

30.5/35

620

12

55

58

24

247

262

111.5

107

109

36

9.88

8.9

41

35

696

18

60

53

29

258

262

111

102

107

47

11.2

10.8

44

38.5

695, 800

19

60

57

24

259

261

110.5

106.5

109

43

10.8

10.3

43

38

900 CARB

24

70

58

29

274

267

113

104.5

109

53

11.75

10.56

43

38

900 IE

25

75

66

28

280

274

115

109

112

53

11.8

11.4

43

38

ST2

29

73

71

30

282

281

112

110.5

111

59

11.8

11.4

43

38

1000DS

15

65

62

19

260

261

115

111.5

113

34

11.2

10.8

45

40

ST3

14

62

59

20

256

259

114

109.5

112

34

10.7

10.4

34

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V2-03-210

25

55

45

5

260

230

105

110

108

30

13.1

11.5

 

 

V2-03-211

31

56

45

11

267

236

102.5

107

105

42

13.1

11.5

 

 

V2-03-212

20

65

61

27

265

268

112.5

107

110

47

13.1

11.4

 

 

V2-03-213

32

66

66

29

278

275

107

108.5

108

61

11.5

11.3

 

 

V2-03-300

36

65

63

22

281

265

104.5

110.5

108

58

13

11.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NCR7

50

75

75

50

305

305

102.5

102.5

103

100

11.3

10.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

06090

25

55

45

5

260

230

105

110

108

30

13.1

11.6

 

 

DP DS1000

25

72

72

22

277

274

113.5

115

114

47

 

 

 

 

Notes for the 2V cams

  • Although some people allege the 900 Carb cams specs changed for the ’97 and FE models, all the part numbers are the same.  The listed specs are just different.  The specs for the earlier 900 Carb models are 20/60, 58/20, which are not correct.  These cams were also fitted to the 906 and 907ie.
  • The small valve 900M engines – used in non ‘Special’ carb models from ’96 sometime until ’99 – used the 600/750 cam, along with 750 valve sizes.  See the “900 2V ENGINES: NOT ALL CREATED EQUAL” report.
  • Not all cams are interchangeable.  The 1000 DS (and now 696 and 796) cams are unique, running in the head itself without ball bearings.  The 620/800 cams run in ball bearings like the earlier cams, but have two supporting bearings instead of three, and the location of these is different to the earlier cams.  You could make them fit if you really wanted to.  All others are physically interchangeable.
  • The 696 seems to run the same lobes as the 1000 DS cams, but with the inlet advanced 4 degrees and the exhaust retarded 9.5 degrees, giving less lobe separation / more overlap.
  • ‘06090’ is the Ducati Performance 900 cam.  It is the same as the Vee Two 210 grind, and is now found under the part number 964034AAA.  See the “900SS CARB WITH SOME VEE TWO CAMS” report for results with this cam.
  • The Vee Two 210 grind is referred to as a “torque” grind, whereas the Vee Two dyno graphs show the 212 grind to be a strong “top end” grind.  My ST2 had these cams fitted before I got to it, so I have no before/after experience with them.   In my experience the 212 grind is a little bigger than the specs indicate.
  • The Vee Two 300 grind is to fit the 1000 DS engine.
  • DP DS1000 is the Ducati Performance cam to suit the 1000 and 1100DS engines.  There are two versions of this cam, due to the fact they are physically different.  I believe one has a longer snout on the drive end, but am not sure which is which.  The profile is the same on both.
  • NCR7 is a Megacycle (USA) grind to suit the old Pantah style engine, 750F1, TT1, TT2, etc.  Very old school.

4V Cams.  Again, all timing is given at 1mm clearance (or 1mm lift without any clearance).  Although listed like the 2V cams, the 4V have separate inlet and exhaust cams, as in DOHC.  They are just listed with reference to engines for convenience.

Desmoquattro:

CAM
PAIRING

INLET
OPEN

INLET
CL

EXH
OPEN

EXH
CL

DURATION

CENTRELINE

MAX LIFT

STD VALVES

IN

EXH

INLET

EXH

INLET

EXH

INLET

EXH

4V STD

11

70

62

18

261

260

119.5

112

9.6

8.75

32 - 36

28 – 30

S4/ST4S

11

60

62

18

251

260

114.5

112

9.6

8.75

33/36

29/30

996 SPS

14

73

57

23

267

260

119.5

107

10.8

9.8

36

30

748 SPS

44

72

74

44

296

298

104

105

10.85

9

33

29

SP A/A

44

73

77

42

297

299

104.5

107.5

9.9

8.9

33

29

SP G/G

53

71

71

45

304

296

99

103

11

10.5

34

30

748 R

20

60

62

38

260

280

110

102

12.5

10.5

36

30

748 RS

30

62

74

38

272

292

106

108

12.5

10.5

36

30

CORSA 431

36

72

N/A

N/A

288

N/A

108

N/A

12

N/A

 

 

V2-03-601

41

69

68

42

290

290

104

103

10.7

10.5

 

 

V2-03-602

34

72

68

42

286

290

109

103

12

10.5

 

 

V2-03-603

60

65

N/A

N/A

305

N/A

92.5

N/A

12.4

N/A

 

 

V2-03-604

11

70

53

20

261

253

119.5

106.5

10.8

9.8

 

 

V2-03-607

18

58

60

36

256

276

110

102

12.3

10.3

 

 

CIRCOLO

 

 

 

 

304

294

 

 

10.75

8.75

 

 

SPORTIVO

 

 

 

 

304

288

 

 

10.75

10.1

 

 

FORZA

 

 

 

 

303

288

 

 

12.1

10.1

 

 

SCHRICK

32

60

54

26

272

260

104

104

12

12

 

 

Notes for the 4V Desmoquattro cams

  • ‘Std’ means all Strada models, 748S and USA 996S.  32/28 valves in ’88 – ’91 851.  33/29 valves in 748, all 851SP, ’92 851, 888, 916 and ST4.  36/30 valves in 996.
  • ‘S4/ST4S’ have a different inlet cam with less duration, the exhaust is the same part as the Strada models.  The S4R uses these cams also.  33/29 valves in S4.  36/30 valves in ST4S, S4R.
  • ‘996SPS’ cams were also fitted to the Euro spec ’01 996S, which has an SPS spec engine.
  • ‘SP A/A’ are the cams fitted to the 851 Tri-colour Kit Race, 851 Corsa (?) and 851/888 SP2/3/4 models.
  • ‘SP G/G’ are the cams that were fitted to the 888/916 Corsa bikes.  The G inlet cam was fitted to the 888SP5 and 916SP models, with an A exhaust cam.  The G exhaust was never fitted to a road model as far as I know; maybe the very rare 888SPS had these.
  • ‘748SPS’ have the A exhaust cam, just with slightly different listed specs.  The inlet has similar timing to the A inlet, but 1mm more lift.
  • ‘CORSA 431’ is the inlet cam introduced in the factory Corsa bikes around ’96 (along with the 996 capacity?).  This was superceded a couple more times before the Testastretta engine was introduced.  The Corsa models still used the G exhaust to the end as far as I know.
  • The “996 Racing” cams that are (used to be?) listed in the DP catalogue are the ‘431’ inlet and ‘G’ exhaust.
  • The Vee Two cams are listed as sets, although they may be available as mixtures of inlet and exhaust from different sets.  You’d have to ask Vee Two. 
  • The Vee Two profiles are similar to some Ducati profiles: 601 – 748SPS inlet, G exhaust; 602 – 431 inlet, G exhaust; 604 – 996SPS inlet & exhaust; 607 – 748R inlet & exhaust.
  • The ‘Circolo, Sportivo and Forza cams are made by Pete Smith at Epicycle (link on the index page).  They have no set timing/centreline specification, but would come with recommendations as to where to set them.
  • The Schrick cams are also available from MSD, an Italian company.  Both list cams with identical specs for the 4V Ducati (and BMW).

Testastretta

CAM
PAIRING

INLET
OPEN

INLET
CL

EXH
OPEN

EXH
CL

DURATION

CENTRELINE

MAX LIFT

STD VALVES

IN

EXH

INLET

EXH

IN

EXH

INLET

EXH

749

15

46

53

11

241

244

105.5

111

10.1

9.1

37

30.5

749S '04

23

55

62

24

258

266

106

109

11.4

10.21

38

30.5

REVISED

21

57

66

20

258

266

108

113

11.4

10.21

 

 

749R

21

53

60

20

254

260

106

110

13

11.5

39.5

32

998

4

56

53

11

240

244

116

111

10.15

9.1

40

33

998S

16

60

60

18

256

258

112

111

11.71

10.13

40

33

999R ‘05

21

53

60

20

254

260

106

110

13

11.5

42

34

1098

15

58

60

20

253

260

111.5

110

11.8

10.6

42

34

  • REVISED” refers to the revised cam timing specs for 749S ’04 models as detailed in service information re: stalling at idle.  Simply changing the centreline settings for the cams to reduce overlap.  It amazes me that such a small change in timing can have such a pronounced effect on how the bikes idle (probably part of the reason why my 851 idles so badly).  A few of the 749S we have had stalling issues with have responded well to retarding the inlets another 5 degrees to 113 centreline.
  • These ’04 749S cams are the longest duration of any of the Testastretta cams.
  • 998 refers to base model 998 and 999.  Not the ’05 999 though afaik.
  • ‘998S’ refers to the Euro spec 998S.  The USA spec 998S has the base model 998 engine.  These cams are also fitted to the 996R, 998R, 999S (both Euro and USA) and the ’03 999R.  Not sure about the ’05 999R yet.  The ’05 999 has these cams I believe.
  • The 749 and 749S share the same valve spacing, which is different to the 998/999 valve spacing.  I believe the ’05 999R may also have unique valve spacing, as does the 749R.  Therefore the cams do not swap.
  • 749R and ’05 999R use the same profiles.

Below are some graphs showing the profiles of some of the std Ducati cams.  I put it together using info from Doug Lofgren – who has a cam doctor, lucky fellow – and Duane Mitchell – who has his own cam measuring jig.  The three charts are inlet, exhausts and combined.  You can very obviously see the greater duration and overlap the A/G cams have, making the Strada cams look positively tiny.  Even the 996SPS inlet cam looks fairly small in comparison. Also of interest is the shape of the 996SPS exhaust profile.  This is short duration, but once open has nearly as much under curve area as the much bigger exhaust cams.  There are no 748R or ST4S inlet cams on these charts.

In the combined chart, the curves on the left are exhaust – as the exhaust valve opens immediately before the inlet in the 4 stroke cycle.

For some more charts and info on the 4V Desmoquattro cam profiles, check out Doug’s cam report at:
http://www.visi.com/~moperfserv/duc_cams.htm

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