- Joined
- Aug 6, 2005
- Messages
- 1,211
I thought I read a post recently where someone said they had chrome slides for amal concentrics, but I can't find the post. I'd like to try one on a 928 if possible. Anyone know who had them?
britbike220 said:Thanks, but I think it was states side. I think shipping from uk would be cost prohibitive for such a common item.
montelatici said:OK, I'm confused. If the slide is made of harder metal (chrome) than the body of the carburetor, hence the bore, won't they wear down the bore of the carburetor faster? I would rather replace the slide occasionally than have to resleeve the bore.
swooshdave said:montelatici said:OK, I'm confused. If the slide is made of harder metal (chrome) than the body of the carburetor, hence the bore, won't they wear down the bore of the carburetor faster? I would rather replace the slide occasionally than have to resleeve the bore.
Chrome, if you hadn't noticed, is relatively smooth. :mrgreen:
jimonthego said:I get my chrome slides from British Cycle Supply.
Believe it or not, the softer body actually wears the harder slide.
This is not unlike a machinists process called lapping where a soft (often copper) expanding mandrel is used to hold abrasive paste. The mandrel is rotated in a harder cylinder to give it a precise finish.
OK, so we don't squirt toothepaste onto our carbs but a certain amount of airborne crud does make its way into the intake and some of it sticks in the carb - to the softer metal which will now wear the harder metal. Check out a modern carb, they are all hard chromed or hard anodized. The hard slides will last a loooong time and IMHO you shouldn't ever wear the carb body out.
Enjoy hard slides, I do.
montelatici said:Ok, so if harder metals get worn by softer metals (and I am skeptical), why do they use chrome cylinders on racing engines rather than the pistons? Do you think it is the heat factor? Anyway, now that you have chrome slides, what happens when you resleeve with chrome or whatever harder material they use? Do you go back to normal slides?
montelatici said:Never had any problems with my original AMALs since I bought my Norton 35+ years ago. Have rebuilt the engine twice, but same carbs and slides only replaced for tuning purposes maybe after the last rebuild 10 years ago. Amals wear out when people over torque the carb falnge and get the carb body out of round, full stop. That's why I am skeptical about all this hocus pocus. By the way, I have forgotten more about Norton mechanical issues than you will ever learn, so keep this "I don't think you get it" crap to yourself.