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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Alloy heads and copper gaskets.
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<blockquote data-quote="A Nut" data-source="post: 137426" data-attributes="member: 2005"><p>Hi Neil,</p><p>Over the years I have had 2 bronze heads welded up but many years ago by a specialist welder near Cirencester. Unfortunately he has long retired. The one on my Comet went quite well but the other on the TT bike not so well. This head had valve seats fitted by a so called specialist but the problem was (and is) that there is hot enough meat there to sink a valve seat in and consequently even with a shallow seat the seats eventually broke through into the ports. This head had to have extensive welding as the seat cavities had to be filled as well. On machining I found that there was not quite enough weld deposited so it had to he rewelded. The heat involved distorted the head and I had to reface it and also rebore and align the valve guide holes. Unfortunately I don't have an answer for you except that I think you may be safer going down the welding route but you will need to find a specialist.</p><p>Best of luck</p><p>Brian</p></blockquote><p></p>
[QUOTE="A Nut, post: 137426, member: 2005"] Hi Neil, Over the years I have had 2 bronze heads welded up but many years ago by a specialist welder near Cirencester. Unfortunately he has long retired. The one on my Comet went quite well but the other on the TT bike not so well. This head had valve seats fitted by a so called specialist but the problem was (and is) that there is hot enough meat there to sink a valve seat in and consequently even with a shallow seat the seats eventually broke through into the ports. This head had to have extensive welding as the seat cavities had to be filled as well. On machining I found that there was not quite enough weld deposited so it had to he rewelded. The heat involved distorted the head and I had to reface it and also rebore and align the valve guide holes. Unfortunately I don't have an answer for you except that I think you may be safer going down the welding route but you will need to find a specialist. Best of luck Brian [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Alloy heads and copper gaskets.
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