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British Bikes / Re: 196 super sport inlet manifold
« Last post by Vreagh on October 23, 2024, 07:42:30 PM »I had to use the large horn so it could be heard over the exhaust.😁
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British Bikes / Re: 196 super sport inlet manifold
« Last post by Rex on October 23, 2024, 06:47:07 PM »Looks to be the same engine as my old Coventry Eagle had fitted.
I guess you'd need a pokey engine to drag that huge horn around...
I guess you'd need a pokey engine to drag that huge horn around...
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British Bikes / Re: 196 super sport inlet manifold
« Last post by Vreagh on October 23, 2024, 06:20:45 PM »Yes shim stock, .1mm thick. Here's before and after pics, I didn't want to repaint the tank because I'd lose that originality so have done little cosmetically on any of the bike.
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British Bikes / Re: 196 super sport inlet manifold
« Last post by R on October 23, 2024, 12:51:00 AM »Get a pic ?
We are assuming this stuff must be mighty thin - shimstock ?
We are assuming this stuff must be mighty thin - shimstock ?
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British Bikes / Re: 196 super sport inlet manifold
« Last post by Vreagh on October 22, 2024, 03:32:53 PM »Update in case someone else might find it useful. I curled a 3/4" x 10" strip of 316 (a4) stainless into a 7" circle and wound it inside the carb. It's springiness held it tight to the outside and tried the fit, it was too tight so kept removing 1/2" of length until it was a snug fit. Carb is now tight with no air leaks and engine running sweet. Many thanks to all for your suggestions.
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British Bikes / Re: 196 super sport inlet manifold
« Last post by 33d6 on October 17, 2024, 01:46:22 PM »Yes, Villiers did eventually move to bronze manifolds. Seems to have started in the late thirties as I have 9D engines with brass manifolds. They last much better than aluminium but boy, are they heavy.
If I ever make any more they will be bronze.
If I ever make any more they will be bronze.
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British Bikes / Re: 196 super sport inlet manifold
« Last post by Vreagh on October 17, 2024, 10:34:07 AM »I too worried about electrolytic action between brass and alloy so have ordered stainless shim (I never thought about a drinks can). This combination seems to work on marine equipment fairly well. I did notice in the kit of spares is a bronze manifold but this would seem to carry the carb at a odd angle but is worth digging out and checking again. Thanks all for your input, I now have a few avenues to try.
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British Bikes / Re: 196 super sport inlet manifold
« Last post by 33d6 on October 17, 2024, 04:47:12 AM »I am curious. It wouldn’t be the first time I’ve seen a bronze Villiers carb seemingly bonded onto an aluminium manifold. Aluminium and bronze is not a happy electrolytic combination. Over a long period the aluminium corrodes away and sort of bonds into the bronze carb body. This is not really a problem as long as the joint isn’t disturbed and the owner treats both items as a single unit, removing both manifold and carb together and keeping them together but unfortunately this is a rare occurrence. They began life as separate items and the owner reasonably expects them to continue this way.
This may have been what’s happened here. It’s an ancient motor cycle, the manifold and carb have had a very long time together for electrolytic activity to occur, then along comes an enthusiastic owner who separates the two for cleaning and renovation finding the manifold “shrunk “ when the corrosion is cleaned off.
The same problem remains. How to fix it. I tend towards permanent solutions. I really don’t like the bits of shim or aluminium can route. In addition to my two previous suggestions I’d consider a thin sleeve. Trueing up the current stub and the permanently fixing on a thin sleeve with Araldite or similar. This would all depend on how sturdy the original stub is when cleaned up.
This may have been what’s happened here. It’s an ancient motor cycle, the manifold and carb have had a very long time together for electrolytic activity to occur, then along comes an enthusiastic owner who separates the two for cleaning and renovation finding the manifold “shrunk “ when the corrosion is cleaned off.
The same problem remains. How to fix it. I tend towards permanent solutions. I really don’t like the bits of shim or aluminium can route. In addition to my two previous suggestions I’d consider a thin sleeve. Trueing up the current stub and the permanently fixing on a thin sleeve with Araldite or similar. This would all depend on how sturdy the original stub is when cleaned up.
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British Bikes / Re: 196 super sport inlet manifold
« Last post by cardan on October 17, 2024, 01:37:45 AM »Aluminium drink can + scissors, with a smear of non-setting gasket compound.
Leon
Leon
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British Bikes / Re: 196 super sport inlet manifold
« Last post by R on October 16, 2024, 11:03:35 PM »In this neck of the woods, we have a chap who can reclaim about anything
using hard chrome plating - and grinding back to size.
Perhaps there is similar in your area ?
This can add quite some thickness, if necessary.
Quite economical too.
using hard chrome plating - and grinding back to size.
Perhaps there is similar in your area ?
This can add quite some thickness, if necessary.
Quite economical too.