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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Blasting crankcases
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<blockquote data-quote="davidd" data-source="post: 104576" data-attributes="member: 1177"><p>Simon,</p><p></p><p>I am not sure that you would be happy with soda blasting. I do it, but it is not as thorough as bead blasting or vapor blasting (vapor blasting is usually bead and some fluid used as a slurry). Soda blasting will not change the surface extensively. This means if it is "stainded" the way old cases can get to be, they will not look totally clean.</p><p></p><p>Here is a before and after of the inside of a timing chest that is soda balsted:</p><p>[ATTACH=full]25979[/ATTACH]</p><p>Here is a close up of the cam area after soda blasting:</p><p>[ATTACH=full]25980[/ATTACH]</p><p>You can see that the case is substantially cleaner and that what is left, what I have called "staining" is still present, but the machined area is much cleaner and I would expect the more aggressive bead or vapor blasting to look like the machined area does, very clean and no staining.</p><p></p><p>I don't mind the inside of the timing chest looking this way, but the visible surfaces probably need to have more aggressive blasting.</p><p></p><p>If you examine your cases you could ask the question "is there any passage in this engine that I cannot clean thoroughly after bead blasting?" If the answer is "yes", then you should consider not doing it. If the answer is "no", that your disassembly is going to be extensive and that you will spend time examining and cleaning all the oil ways, I think I would opt for the more aggressive cleaning. </p><p></p><p>I did a combination on these cases and I spent time focusing on all the threads and oil passages after cleaning and before assembly. I felt that was good insurance and I hope it works out well. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 104576, member: 1177"] Simon, I am not sure that you would be happy with soda blasting. I do it, but it is not as thorough as bead blasting or vapor blasting (vapor blasting is usually bead and some fluid used as a slurry). Soda blasting will not change the surface extensively. This means if it is "stainded" the way old cases can get to be, they will not look totally clean. Here is a before and after of the inside of a timing chest that is soda balsted: [ATTACH type="full" alt="25979"]25979[/ATTACH] Here is a close up of the cam area after soda blasting: [ATTACH type="full" alt="25980"]25980[/ATTACH] You can see that the case is substantially cleaner and that what is left, what I have called "staining" is still present, but the machined area is much cleaner and I would expect the more aggressive bead or vapor blasting to look like the machined area does, very clean and no staining. I don't mind the inside of the timing chest looking this way, but the visible surfaces probably need to have more aggressive blasting. If you examine your cases you could ask the question "is there any passage in this engine that I cannot clean thoroughly after bead blasting?" If the answer is "yes", then you should consider not doing it. If the answer is "no", that your disassembly is going to be extensive and that you will spend time examining and cleaning all the oil ways, I think I would opt for the more aggressive cleaning. I did a combination on these cases and I spent time focusing on all the threads and oil passages after cleaning and before assembly. I felt that was good insurance and I hope it works out well. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Blasting crankcases
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