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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow engine painting
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<blockquote data-quote="greg brillus" data-source="post: 41401" data-attributes="member: 597"><p>Regards to the painting of Shadow engines.....David Bowen told me that the case halves were bolted together with a few through bolts and cover plates screwed on over the timing, primary, cylinder spiggot holes, etc. other fittings and holes blanked off. Then the cases were lowered into a drum of black stove enamel, then left for a short period to drip off excess paint and then hung in a cabinet of some sort with a gas ring at the bottom to heat the cabinet and aid in the stoving of the paint. I think the heads and barrels were done in a similar way, but maybe with a different paint due to the heat these items would have to endure. I do not believe the parts were primed, rather the cases were etched using a solution they had available back then ( pylumenising) or whatever it was called. This would be a similar process as is used today on alloy aircraft sheet metal and other components which gives the surface a slight gold finish. It is more of a barrier to corrosion than anything. But the original finish would have been very thin, and yes the last part of the engine number was stamped on after painting, and the numbers touched up with a fine artists brush afterwards. I am unsure how the factory painted the outer covers, but i would have thought that they would have sprayed them to get a descent enough finish. It is a fair comment to say that almost all Shadows restored these days have a paint finish far more shiny and much thicker than the factory produced....well not to many folks have a spair drum of "Pinchin Johnsons" finest stove enamel kicking around in their sheds, do they......any thoughts.......Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 41401, member: 597"] Regards to the painting of Shadow engines.....David Bowen told me that the case halves were bolted together with a few through bolts and cover plates screwed on over the timing, primary, cylinder spiggot holes, etc. other fittings and holes blanked off. Then the cases were lowered into a drum of black stove enamel, then left for a short period to drip off excess paint and then hung in a cabinet of some sort with a gas ring at the bottom to heat the cabinet and aid in the stoving of the paint. I think the heads and barrels were done in a similar way, but maybe with a different paint due to the heat these items would have to endure. I do not believe the parts were primed, rather the cases were etched using a solution they had available back then ( pylumenising) or whatever it was called. This would be a similar process as is used today on alloy aircraft sheet metal and other components which gives the surface a slight gold finish. It is more of a barrier to corrosion than anything. But the original finish would have been very thin, and yes the last part of the engine number was stamped on after painting, and the numbers touched up with a fine artists brush afterwards. I am unsure how the factory painted the outer covers, but i would have thought that they would have sprayed them to get a descent enough finish. It is a fair comment to say that almost all Shadows restored these days have a paint finish far more shiny and much thicker than the factory produced....well not to many folks have a spair drum of "Pinchin Johnsons" finest stove enamel kicking around in their sheds, do they......any thoughts.......Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow engine painting
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