Cam Shafts (Timing) - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 8 (permalink) Old 12-06-2012, 10:32 PM Thread Starter
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Cam Shafts (Timing)

Have had the cams timed, with the exhaust being ground to the same specs as the inlet-this is how it all panned out with 020" tappet lift.
44/77-106.5deg and 83/38-112.5deg plus their is another notation-
110C/L .020 ex not sure what this means.
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post #2 of 8 (permalink) Old 12-06-2012, 11:19 PM
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Checking the cam timing at 0.020" lift is almost a waste of time.Check it at 0.080" lift.
0.020" lift figures are not reliable.If they happen to be accurate,your intake lobe centre is 106.5 degrees:advance it 4.8 degrees and it will run better.
112.5 is a little much on the exhaust.If the 0.020" figures agree with 0.080" figures,retard the exhaust 4.8 degrees.
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post #3 of 8 (permalink) Old 12-07-2012, 04:25 AM Thread Starter
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Cam Timimg

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Originally Posted by Mr.Pete View Post
Checking the cam timing at 0.020" lift is almost a waste of time.Check it at 0.080" lift.
0.020" lift figures are not reliable.If they happen to be accurate,your intake lobe centre is 106.5 degrees:advance it 4.8 degrees and it will run better.
112.5 is a little much on the exhaust.If the 0.020" figures agree with 0.080" figures,retard the exhaust 4.8 degrees.
Well time will tell, not every one is an expert and, experts are sometimes only in their own mind! Further to that, I trust my Guy, he has ground more cams than I have had hot meals, cam timing to him is second nature. He was not the least bit interested in mucking around with .080" and did it his way. All I have read on the net is"020" is all good.
Not changing anything, and as above time will tell!
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post #4 of 8 (permalink) Old 12-07-2012, 05:18 AM
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forget all that clearance nonsense, set the cams off the lobe centre, T140 inlet profiles are the same as norris z cams and spitfire, they will work well set at 102' on both cams.
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post #5 of 8 (permalink) Old 12-07-2012, 05:30 AM
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98 intake lobe centre makes good torque at mid-range;102 makes a little more power,but less mid-range.
102-103 on the exhaust will give good maximum power.Anything up to 110 will give better results at low rpm and mid-range,but a little less maximum power.

If you read the article I wrote in "Vintage Bike" earlier this year,you'd know why it's better to check lobe centre at a higher lift.0.020" lift can be misleading ;0.050" or even 0.100" lift gives a better picture of the true lobe centre.
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post #6 of 8 (permalink) Old 12-07-2012, 12:52 PM
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Quote:
Originally Posted by lovecuba View Post
Well time will tell, not every one is an expert and, experts are sometimes only in their own mind! Further to that, I trust my Guy, he has ground more cams than I have had hot meals, cam timing to him is second nature. He was not the least bit interested in mucking around with .080" and did it his way. All I have read on the net is"020" is all good.
Not changing anything, and as above time will tell!
So what exactly are you asking for in the first post, if not opinions like Mr P's?
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post #7 of 8 (permalink) Old 12-07-2012, 03:10 PM Thread Starter
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Cam Timimg

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So what exactly are you asking for in the first post, if not opinions like Mr P's?
Fair comment TT. A tad bad mannered in my reply to Mr Pete and an apology is given.
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post #8 of 8 (permalink) Old 12-07-2012, 04:37 PM
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Fair comment TT. A tad bad mannered in my reply to Mr Pete and an apology is given.
Nah- it's good enough for him!
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