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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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<blockquote data-quote="Martyn Goodwin" data-source="post: 55845" data-attributes="member: 2433"><p>I have taken the advise of PEI in Tuning for Speed by measuring the valve lift (dial indicator on the top of the valve) as outlined in the chapter "Improved Cylinder Filling"; it is important that the steady plate be in place and that all lash be taken out of the valve train when taking measurements. It was a time consuming task but was very informative, especially after entering the data into Microsoft excel and producing a number of detailed graphs. My cam is a recently purchased (less than 10,000 miles use) Mk.1 and below is the overview graph of the results of my measurements. Detailed examination of the data shows that my cam is pretty close to the mid point of the specification contained in Richardson. It is interesting to note that the point of equal lift is 4 degrees BTDC. </p><p></p><p>The main advantage as far as I see it is, once you have obtained like information about the cam(s) in YOUR bike - remember no 2 cams are identical - you can then make subsequent changes/adjustments to cam timing by measuring just the exhaust valve - which on a Comet can be done without the need to lift the UFM .</p><p></p><p>If anyone wants to see all the details of MY Mk 1 cam (remember yours will be different) send me a PM with your email address and I will send you the excel file.</p><p></p><p>[ATTACH=full]3050[/ATTACH]</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 55845, member: 2433"] I have taken the advise of PEI in Tuning for Speed by measuring the valve lift (dial indicator on the top of the valve) as outlined in the chapter "Improved Cylinder Filling"; it is important that the steady plate be in place and that all lash be taken out of the valve train when taking measurements. It was a time consuming task but was very informative, especially after entering the data into Microsoft excel and producing a number of detailed graphs. My cam is a recently purchased (less than 10,000 miles use) Mk.1 and below is the overview graph of the results of my measurements. Detailed examination of the data shows that my cam is pretty close to the mid point of the specification contained in Richardson. It is interesting to note that the point of equal lift is 4 degrees BTDC. The main advantage as far as I see it is, once you have obtained like information about the cam(s) in YOUR bike - remember no 2 cams are identical - you can then make subsequent changes/adjustments to cam timing by measuring just the exhaust valve - which on a Comet can be done without the need to lift the UFM . If anyone wants to see all the details of MY Mk 1 cam (remember yours will be different) send me a PM with your email address and I will send you the excel file. [ATTACH=full]3050[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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