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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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<blockquote data-quote="Nigel Spaxman" data-source="post: 80775" data-attributes="member: 2907"><p>I think that if you are within 1/2 a degree that you can't get any closer than that. Mine didn't time exactly the same between the front and rear, but it was pretty close. After setting them my way, I installed the heads with inner valve springs only and checked them a few other ways. I checked the figures with the valve lifts at TDC that Terry had specified it was pretty close to .170". I also compared my engine with some figures for the Megacycle MKII cams that also have 105 degree lobe centers. I think for the Megacycle specs were opening and closing figures at .050 lift. I think Terry's cams had quite a bit less overlap than the Megacyle specs. I wrote it all down somewhere. Terry thinks his MKII 105 cams are the best ones for a road going Vincent, but I guess it depends how fast you want to go. You would think the extra lift and duration compared with the MKI cams can only help. My bike is never going to do 124 MPH in third gear that's for sure. Probably the standard MKII cams are better if you want to go faster. </p><p></p><p>My bike starts first kick idles perfectly and never pings at all. So far that gas mileage is about 50 MPG which is not that good really. Maybe this year with my new ignition system it will be a bit better. I am installing the Dyna 2000 with a vacuum advance switch. Apparently this can make quite a big difference. I think that with this vacuum switch I will be running a lot more advance when the engine is turning a moderate speeds on part throttle. When I am accelerating hard it will be running about the same as it was without the vacuum advance.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 80775, member: 2907"] I think that if you are within 1/2 a degree that you can't get any closer than that. Mine didn't time exactly the same between the front and rear, but it was pretty close. After setting them my way, I installed the heads with inner valve springs only and checked them a few other ways. I checked the figures with the valve lifts at TDC that Terry had specified it was pretty close to .170". I also compared my engine with some figures for the Megacycle MKII cams that also have 105 degree lobe centers. I think for the Megacycle specs were opening and closing figures at .050 lift. I think Terry's cams had quite a bit less overlap than the Megacyle specs. I wrote it all down somewhere. Terry thinks his MKII 105 cams are the best ones for a road going Vincent, but I guess it depends how fast you want to go. You would think the extra lift and duration compared with the MKI cams can only help. My bike is never going to do 124 MPH in third gear that's for sure. Probably the standard MKII cams are better if you want to go faster. My bike starts first kick idles perfectly and never pings at all. So far that gas mileage is about 50 MPG which is not that good really. Maybe this year with my new ignition system it will be a bit better. I am installing the Dyna 2000 with a vacuum advance switch. Apparently this can make quite a big difference. I think that with this vacuum switch I will be running a lot more advance when the engine is turning a moderate speeds on part throttle. When I am accelerating hard it will be running about the same as it was without the vacuum advance. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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