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Triumph Cams

 

 

500 Twin500TRtwin_cam.jpg (33748 bytes)650/ 750'sTR650_750cams.jpg (55732 bytes)         


 Q Cam
Factory speed kit grind for 500's of the 50's, also used in the 650 TT Specials of the 60's.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .316 105° .002 R 271°
251°
31°btdc
21°btdc
60°abdc
50°abdc
.020
.040
Exhaust .316 105° .004 R 271°
251°
61°bbdc
51°bbdc
30°atdc
20°atdc
.020
.040

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 Jomo TT Cam

A little more duration than the Q cam, gives a little more top end power.

$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .310 105° .002 R 276°
255°
33°btdc
21°btdc
65°abdc
53°abdc
.020
.040
Exhaust .310 105° .004 R 276°
255°
62°bbdc
52°bbdc
35°atdc
23°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


 Harmon&Collins 7054 Cam
A little more lift than the Q cam. For more mid-range torque.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .326 105° .002 R 267°
246°
31°btdc
20°btdc
56°abdc
46°abdc
.020
.040
Exhaust .326 105° .004 R 267°
246°
61°bbdc
50°bbdc
26°atdc
16°atdc
.020
.040

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 Connely #1 Cam
Lots of torque off tight corners. Tight TT, short Motocross, not good at high rpm.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .353 105° .002 R 280°
261°
31°btdc
21°btdc
69°abdc
59°abdc
.020
.040
Exhaust .353 105° .004 R 280°
261°
61°bbdc
51°bbdc
39°atdc
29°atdc
.020
.040

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Johnson J360/264 Cam
Johnson designed for 750 Triple Road racing, and by coincidence is a modern version of the TH6.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .353 102° .008 S 305°
277°
51°
373°
73°
60°
.020
.040
Exhaust .353 110° .008 S 305°
377°
83°
69°
41°
29°
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Triumph T-3 Cam
Stock 750 triple cam. Has always been hard to beat and works well in  500 twins also.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .328 102° .006 R 393°
264°
44°btdc
30°btdc
69°abdc
54°abdc
.020
.040
Exhaust .328 105° .008 R 293°
264°
72°bbdc
57°bbdc
41°atdc
27°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Triumph T-65 Cam
Between a Q and a Jomo 15. Good for hot street, short track, and TT in 650 and 750 twins.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .344 105° .008 R 280°
255°
36°btdc
23°btdc
64°abdc
52°abdc
.020
.040
Exhaust .344 105° .010 R 280°
255°
66°bbdc
53°bbdc
35°atdc
22°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Triumph T-75 Cam
Stock 750 twin intake. Use in exhaust also, for hot street motors- and racing, where endurance means more than the last HP. Good to 7000rpm with stock springs.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .345 105° .010 S 294°
270°
40°btdc
29°btdc
74°abdc
61°abdc
.020
.040
Exhaust .345 105° .010 S 294°
270°
71°bbdc
59°bbdc
44°atdc
32°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


 Jomo 15 Cam
This cam has long been considered the classic "all around" racing cam for the Triumph 650 and 750 twins.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .354 106° .006 R 289°
267°
37°btdc
28°btdc
72°abdc
60°abdc
.020
.040
Exhaust .354 106° .008 R 289°
267°
69°bbdc
59°bbdc
39°atdc
29°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


 Sifton 390 Cam

This grind is an improved version of the Jomo 15. With less seat to seat timing the motor makes more torque, and runs "crisper" down low.

$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .352 105° .008 S 290°
267°
39°btdc
28°btdc
71°abdc
58°abdc
.020
.040
Exhaust .352 105° .008 S 290°
267°
69°bbdc
58°bbdc
41°atdc
28°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Triumph TH6 Cam
Developed by Doug Hele for the factory 500 twin road racers of the late 60's, also used in the 750 triples of the 70's.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .350 105° .006 R 305°
274°
49°btdc
33°btdc
77°abdc
61°abdc
.020
.040
Exhaust .350 105° .008 R 305°
274°
79°bbdc
63°bbdc
47°atdc
31°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Johnson J380/268 Cam
Johnson design for short rod 750 twins. Works very well for flat track use and are used in the Johnson Cams Triumph Flattracker.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .375 102° .008 S 300°
276°
49°btdc
36°btdc
71°abdc
60°abdc
.020
.040
Exhaust .375 110° .008 S 300°
276°
80°bbdc
68°bbdc
39°atdc
27°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


 Sifton 460 Cam
For 1/2 mile and mile flat track and real racers. NOT FOR THE FAINT OF HEART!. Must trim flywheel and tappet blocks.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .400 105° .008 S 306°
283°
49°btdc
37°btdc
77°abdc
65°abdc
.020
.040
Exhaust .400 105° .010 S 306°
283°
79°bbdc
67°bbdc
47°atdc
35°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Johnson J 460
Johnson Design for a smoother, modern version of the Sifton 460 cam. This grind was developed to be easier on springs, tappets, etc. Must trim flywheel and tappet blocks.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .410 102° .008 S 303°
279°
50°btdc
38°btdc
73°abdc
61°abdc
.020
.040
Exhaust .410 110° .008 S 303°
279°
82°bbdc
70°bbdc
41°atdc
29°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services


Johnson J481 Cam
Johnson design drag race cam. It is not recommended for anything other than drag racing. Must trim flywheel and tappet blocks.
$409pr. Lift LCA Lash Tappet Duration Open Close At
Intake .443 102° .008 S 316°
290°
57°btdc
44°btdc
79°abdc
66°abdc
.020
.040
Exhaust .443 110° .008 S 316°
290°
89°bbdc
76°bbdc
47°atdc
35°atdc
.020
.040

Cam Chart Definitions   Home Page   FAQ'S   Cylinder Head Services