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Everything Else (Not Vincent Related)
1938 Rudge Race Bike
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<blockquote data-quote="Nulli Secundus" data-source="post: 102168" data-attributes="member: 560"><p>Here are some pictures of the head.</p><p></p><p><strong><em>Number 1 and 2 exhaust valve seats (both breaking through into their exhaust ports)</em></strong></p><p>[ATTACH=full]25117[/ATTACH]</p><p></p><p><strong><em>Close up of number 1 exhaust valve seat</em></strong></p><p>[ATTACH=full]25118[/ATTACH]</p><p></p><p>Note: Mervyn Stratford originally prepared this head for racing and he said it was now scrap and reckoned a lot has gone on with it since he did it. He was not impressed with the blended valve guides as they are now too short. </p><p></p><p>In my own view of it the valve stem length on the exhausts would now be too long with pocketed valves and therefore the rocker geometry is all wrong. This would increase side thrust on the valve stems and the now too short valve guides.</p><p></p><p></p><p><strong><em>Modified head</em></strong></p><p>[ATTACH=full]25119[/ATTACH]</p><p></p><p>As can be see from the above picture Rudge must of considered having a bolt on rocker box, but in the end chose to use a bolted down spider clamp using a single bolt threaded into the timing hole.</p><p></p><p>When Mervyn did this head only 5 of the available 7 areas were drilled and tapped. The alloy rocker box had to be welded internally to accommodate drilling the bolt holes.</p><p></p><p>Also, from the above picture one can see a broken valve spring and the other pair had collapsed in height, so perhaps that was the cause of the broken pushrod, well that and too many revs...…..</p></blockquote><p></p>
[QUOTE="Nulli Secundus, post: 102168, member: 560"] Here are some pictures of the head. [B][I]Number 1 and 2 exhaust valve seats (both breaking through into their exhaust ports)[/I][/B] [ATTACH=full]25117[/ATTACH] [B][I]Close up of number 1 exhaust valve seat[/I][/B] [ATTACH=full]25118[/ATTACH] Note: Mervyn Stratford originally prepared this head for racing and he said it was now scrap and reckoned a lot has gone on with it since he did it. He was not impressed with the blended valve guides as they are now too short. In my own view of it the valve stem length on the exhausts would now be too long with pocketed valves and therefore the rocker geometry is all wrong. This would increase side thrust on the valve stems and the now too short valve guides. [B][I]Modified head[/I][/B] [ATTACH=full]25119[/ATTACH] As can be see from the above picture Rudge must of considered having a bolt on rocker box, but in the end chose to use a bolted down spider clamp using a single bolt threaded into the timing hole. When Mervyn did this head only 5 of the available 7 areas were drilled and tapped. The alloy rocker box had to be welded internally to accommodate drilling the bolt holes. Also, from the above picture one can see a broken valve spring and the other pair had collapsed in height, so perhaps that was the cause of the broken pushrod, well that and too many revs...….. [/QUOTE]
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1938 Rudge Race Bike
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