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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Engine painting
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<blockquote data-quote="Tom Gaynor" data-source="post: 24157" data-attributes="member: 4034"><p>Good question! Known knowns: 1) They dipped them after phosphating (in Pinchin and Johnson's finest...) 2) Engine covers were matched to their cases.</p><p>Which would suggest that they sent built, empty, motors to be dipped? Which doesn't sound all THAT likely, but would require less masking than doing covers individually. Maybe crankcases and covers were assembled and dipped, and barrels and heads done individually? But Shadow heads had polished ports, and I would do that before painting. </p><p>Someone must know. I am not that person. </p><p>(The Big Sid method is to build the motor empty, then spray it with Polykote. I did not get a good finish, but since all my gloss painting seems to turn out matt, it could easily have been me.)</p><p>All that said, the original finish on my motor, which still largely exists, is completely eclipsed by "restored" Shadow motors I've seen, which have engine cases that look like Sunbeam tanks. (Ordinary production Sunbeam tanks were dipped in P and J and rubbed down FIVE times (Vin tanks were done once) and show bike Sunbeam tanks were done SEVEN times...)</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 24157, member: 4034"] Good question! Known knowns: 1) They dipped them after phosphating (in Pinchin and Johnson's finest...) 2) Engine covers were matched to their cases. Which would suggest that they sent built, empty, motors to be dipped? Which doesn't sound all THAT likely, but would require less masking than doing covers individually. Maybe crankcases and covers were assembled and dipped, and barrels and heads done individually? But Shadow heads had polished ports, and I would do that before painting. Someone must know. I am not that person. (The Big Sid method is to build the motor empty, then spray it with Polykote. I did not get a good finish, but since all my gloss painting seems to turn out matt, it could easily have been me.) All that said, the original finish on my motor, which still largely exists, is completely eclipsed by "restored" Shadow motors I've seen, which have engine cases that look like Sunbeam tanks. (Ordinary production Sunbeam tanks were dipped in P and J and rubbed down FIVE times (Vin tanks were done once) and show bike Sunbeam tanks were done SEVEN times...) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Engine painting
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