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Determining Cam timing using WPS500 (Read 111 times)

James H

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Picogroup

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Determining Cam timing using WPS500
Aug 26^th, 2018 at 3:24pm

It has been my limited experience that it is much easier (at least with motorcycles that do not use a common intake manifold) to determine a reasonably accurate intake valve closing number with the the throttle plate open (no intake restriction) in comparison to when the throttle plate is closed. Is this been the experience of others as well? I have attached a couple of examples.

No_Intake_restriction.psdata (11482 KB | )

With_Intake_restriction.psdata (14202 KB | )

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Spence LSD Guide Picogroup Offline Posts: 8,025 Jeffersonville Pennsylvania USA Gender:	Re: Determining Cam timing using WPS500 Reply #1 - Aug 27^th, 2018 at 3:38am James the valve timing in the note section are they the specs or what you feel the scope capture is telling you?
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James H Senior Member Picogroup Offline Bike Nerd Posts: 165 Waterloo Ontario Canada Gender:	Re: Determining Cam timing using WPS500 Reply #2 - Aug 27^th, 2018 at 5:25am Spence, those numbers in the notes are the correct cam timing specs. That is how I determined the cam timing was out. I have just found when the intake is not open when doing an ICCT it is really hard to see the intake closing point.
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