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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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<blockquote data-quote="Nigel Spaxman" data-source="post: 92836" data-attributes="member: 2907"><p>Thanks for all your replies. I already checked about the 1/4 BSF bolts not being too long, and also that the rocker feed bolt aren't too long. It was when I was examining that that I realized the restriction to the oil is not the hole in the rocker feed anyway. It is true that there is a lot of oil mist and spray in the timing chest already. There is always plenty of oil in the head whenever I look in there too. But many other motorcycles have problems with cam wear and often it does seem that the oil just doesn't get to the right place. It is hard to keep the oil inside. It only goes where we don't want it to go. Oil is unlikely to rush towards a rotating shaft! I had to put an additional spring on the decompressor to stop it leaking there, and that is right behind the cam where I don't seem to have enough oil! I know that many people are happy with the 1mm holes in the feed bolts and some other people find that the original 1/32 holes were OK, but with the wires there may not be enough oil. Terry Prince told me the 1/32 holes are too small, and that I should go to 1mm. I am going to try a lot more oil and see if that helps. As long as the pump can still clear the sump I think it will be an improvement. I think it will as there will only be two extra 1/16" holes going back into the engine. I don't think it makes much difference what size the holes are with the standard arrangement or the locking rocker bolt system, as when you look at it the restriction is really in the rocker bushing rocker pin clearance. It think there were quite a few things wrong on the Vincent twin engine even though Phil Irving was a genius and there is hardly anyone else I admire more, except for the Wright brothers. I am sure that I will still have the same supply to the rocker pins as I have put three holes in the top of the rocker feed bolt, but just one hole at the bottom. The same small pressure that is in the return line will still be present at the inlets to the rocker pin holes. From the wear problem I have it does seem as though the two exhaust lobes are doing better than the intake lobes. There does seem to be a lot of discussion about this topic for many years in MPH, I am not the only one who has had problems. Some people even add an extra oil pump!!! I think maybe there is a problem but I am hoping I can solve it a bit more simply. The stuff that came with my basket case was horribly worn, and had been bastardized in Argentina to keep it running. I just looked in a box of parts from that; the MKI cams that came with it weren't to bad only a little wear on one lobe. Maybe I should try them out with some new followers. The cam followers I got were horrible. They must not have been the ones that went with the cams.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 92836, member: 2907"] Thanks for all your replies. I already checked about the 1/4 BSF bolts not being too long, and also that the rocker feed bolt aren't too long. It was when I was examining that that I realized the restriction to the oil is not the hole in the rocker feed anyway. It is true that there is a lot of oil mist and spray in the timing chest already. There is always plenty of oil in the head whenever I look in there too. But many other motorcycles have problems with cam wear and often it does seem that the oil just doesn't get to the right place. It is hard to keep the oil inside. It only goes where we don't want it to go. Oil is unlikely to rush towards a rotating shaft! I had to put an additional spring on the decompressor to stop it leaking there, and that is right behind the cam where I don't seem to have enough oil! I know that many people are happy with the 1mm holes in the feed bolts and some other people find that the original 1/32 holes were OK, but with the wires there may not be enough oil. Terry Prince told me the 1/32 holes are too small, and that I should go to 1mm. I am going to try a lot more oil and see if that helps. As long as the pump can still clear the sump I think it will be an improvement. I think it will as there will only be two extra 1/16" holes going back into the engine. I don't think it makes much difference what size the holes are with the standard arrangement or the locking rocker bolt system, as when you look at it the restriction is really in the rocker bushing rocker pin clearance. It think there were quite a few things wrong on the Vincent twin engine even though Phil Irving was a genius and there is hardly anyone else I admire more, except for the Wright brothers. I am sure that I will still have the same supply to the rocker pins as I have put three holes in the top of the rocker feed bolt, but just one hole at the bottom. The same small pressure that is in the return line will still be present at the inlets to the rocker pin holes. From the wear problem I have it does seem as though the two exhaust lobes are doing better than the intake lobes. There does seem to be a lot of discussion about this topic for many years in MPH, I am not the only one who has had problems. Some people even add an extra oil pump!!! I think maybe there is a problem but I am hoping I can solve it a bit more simply. The stuff that came with my basket case was horribly worn, and had been bastardized in Argentina to keep it running. I just looked in a box of parts from that; the MKI cams that came with it weren't to bad only a little wear on one lobe. Maybe I should try them out with some new followers. The cam followers I got were horrible. They must not have been the ones that went with the cams. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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