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#593447 - 04/04/15 3:43 pm Cam timing  
Joined: May 2014
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cacinni Offline
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cacinni  Offline
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Got TDC using my degree wheel, using the method lobe center angle to time cams and checking i/2 a dozen times iam coming up with 106 on the intake, megacycle specs 101 intake, 104.5 on the exhaust, what adjustment do i make to get to megacycle specs, triumph 500 motor, thanks guys!

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#593481 - 04/04/15 7:48 pm Re: Cam timing [Re: cacinni]  
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Pete R - R.I.P. Offline
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Vic. Australia
Remove the camwheel from the intake cam.
Without moving the cam, rotate the camwheel 120 degrees clockwise to the next keyway. Fit the camwheel back on. That should advance the timing 4.8 degrees.
The cam will actually move slightly when you re-fit the camwheel, but barely perceptible.

Then you'll need a new timing mark on that camwheel, 17 teeth away from the original mark.

#593501 - 04/04/15 9:01 pm Re: Cam timing [Re: cacinni]  
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cacinni Offline
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Thanks Pete, for future reference, like when i do the exhaust cam, say it was advanced 3 degrees, i would advance how many teeth clockwise to clear up the difference? Thank you!

#593509 - 04/04/15 9:26 pm Re: Cam timing [Re: cacinni]  
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cacinni Offline
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cacinni  Offline
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Thanks Pete, for future reference, like when i do the exhaust cam, say it was advanced 3 degrees, i would advance how many teeth clockwise to clear up the difference? Thank you!

#593512 - 04/04/15 10:42 pm Re: Cam timing [Re: cacinni]  
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Pete R - R.I.P. Offline
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You can only change the timing in 4.8 degree increments, unless you start using a selection of different camwheels.
If it's advanced 3 degrees, it will still run fine. You could even be happier with it.

4.8 degrees = 1/3 of a tooth
14.4 degrees = a full tooth

#593517 - 04/05/15 12:19 am Re: Cam timing [Re: cacinni]  
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fightclub Offline
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nc
Not trying to hi jack thread Caccini but I had a question for Pete R. Mr.Pete did you do a thread/post on details on center lobe cam timing method. I cannot find anything doing search.
Thank you

#593522 - 04/05/15 12:29 am Re: Cam timing [Re: cacinni]  
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Pete R - R.I.P. Offline
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Here's something I wrote on another forum. That should give you an idea.(about 2/3 way down the page) You can measure at the top of the pushrod, with a dial gauge. Just take the measurement at the same lift on both the opening and closing ramp.
Cam Timing Check

#593563 - 04/05/15 7:07 am Re: Cam timing [Re: cacinni]  
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cacinni Offline
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cacinni  Offline
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Pennsylvania, USA
FIGHTCLUB there is a excellent article on this in one of the back VINTAGE BIKE magazines.

#593657 - 04/05/15 5:31 pm Re: Cam timing [Re: cacinni]  
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cacinni Offline
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cacinni  Offline
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Pennsylvania, USA
After spending more time on the intake cam utilizing all 3 key ways the numbers i have 98.5, 102.0, 105.0 ran these key ways a couple different times, do these numbers alarm anyone? Plan on trying all 3 key ways during the week to make sure iam getting consistant numbers before moving on to exhaust cam! Thanks for your input guys!


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