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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Offset ET28 hole in ET25 for more valve lift
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<blockquote data-quote="greg brillus" data-source="post: 52627" data-attributes="member: 597"><p>John, this may be of interest....When John Trease here in Australia was building the engine for Ian Boyd's Vinton racer, he redesigned everything possible in the head, and used 1.6:1 rockers. The load imposed on the cam and followers was so high that they wore quickly. So he changed to solid followers and more modern profile cams. Of course he also fitted a high pressure oil system, with slipper type big end bearings as well. I think from this info that the week link in the valve train as far as extra load is concerned would seem to be the cams and followers......this may not be an issue for your set up, but if the engine is to survive a long time, it maybe something to consider. By the way.....what cylinder heads are you using, are they originals, or the newer squish band chamber heads...?</p></blockquote><p></p>
[QUOTE="greg brillus, post: 52627, member: 597"] John, this may be of interest....When John Trease here in Australia was building the engine for Ian Boyd's Vinton racer, he redesigned everything possible in the head, and used 1.6:1 rockers. The load imposed on the cam and followers was so high that they wore quickly. So he changed to solid followers and more modern profile cams. Of course he also fitted a high pressure oil system, with slipper type big end bearings as well. I think from this info that the week link in the valve train as far as extra load is concerned would seem to be the cams and followers......this may not be an issue for your set up, but if the engine is to survive a long time, it maybe something to consider. By the way.....what cylinder heads are you using, are they originals, or the newer squish band chamber heads...? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Offset ET28 hole in ET25 for more valve lift
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