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PR: Proprietary Items TT carb

vibrac

Well Known and Active Website User
VOC Member
Following on the discussion on TT carbs on a 'welcome too' post I see that there is a rare bird flown in on ebay

I have seen his stuff before and it all looks good he was the source for the BTH (original not electronic) mag on my grey flash
I only have a flange fitting carb on my GF replica because you dont find many clip fitting ones
 

Cyborg

Well Known and Active Website User
VOC Member
They should be a slip fit on the manifolds, so if you are doing something like converting a flange mount to spigot mount, you should bore the spigot after you acquire the manifolds. If the carburetor has been off and on a few times, the ID of the spigot is no longer round, so perhaps better to use the manifold OD... assuming you are using new manifolds. If you are using original ET32/4 or ET32/5, then the male spigot won’t be round anymore either, so you’ll have to average it out... basically pick a number. It will be “somewhere” in the neighbourhood of 35.75mm (numbers do seem to vary) As I understand it, Vincent’s 32mm TT is in pretty decent shape, so he may come up with a slightly different number, but still think it’s better to match the carb with the manifold... but just guessing what you are up to.
 
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timetraveller

Well Known and Active Website User
VOC Member
I can tell you what he is up to. I am providing him with a new front bronze adaptor for a 10 TT9 carb. However, Chris also has one with a slightly different suffix which seems to be exactly the same as a 10 TT9 except that it is handed and has the adjuster screw on the other side. He would like to be able to use either carb but his 10 TT9s are miles away from where he is with the different one and he just asked me if I knew the sizes. I don't but cannot imagine why Amals would have made clip fitting 10 TT 9 with different internal diameters to the clip fitting part. The one he has access to is 36.85 mm so the question is what is a standard one, or if they are variable, what is the range?
 
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timetraveller

Well Known and Active Website User
VOC Member
Vincent, the shape that you show is more or less the same as the bare castings from which I supply either the bronze of aluminium manifolds. That shape was adopted so that manifolds could be made to fit either clip fitting, flange fitting or rubber tube mounted carbs by machining the outer end to fit. It was intended that the final length and shape should match the original Lightning or Flash carb adaptors from the early 1950s. If there is a need for shorter adaptors to allow the front carb to fit under the petrol tank then those could possibly be machined from the same casting but they would lack the length determined by the Works to optimise performance.
 

Vincent Brake

Well Known and Active Website User
VOC Member
You supplied them Norm.
Haha..

I thought one day i get those mikunies off.
And put on that 10tt9.

Ive got for the other side a flange one
Not without trouble to convert to clip.
So will weld up some alu.
 

Nigel Spaxman

Well Known and Active Website User
VOC Member
You supplied them Norm.
Haha..

I thought one day i get those mikunies off.
And put on that 10tt9.

Ive got for the other side a flange one
Not without trouble to convert to clip.
So will weld up some alu.
Vincent, you and I must think alike. I have a set of 10TT9 flange fitting that I have saved incase I ever want to get rid of the Mikunis. Allyson says once the bike is running really well then I will change the carbs. so I can fiddle with it for another 6 months. I never have to touch the Mikunis and it starts first kick so maybe I will have to make that conversion soon.
 

oexing

Well Known and Active Website User
VOC Member
Vincent,
seeing you this year was just not doable, thanks virus. But if you like, I saved some of my castings for clip mounting carbs , up to 34 mm possible, castings are 40 mm o.d. . I got 32mm Bings for the B Rapides and did my own sandcasting - well , I had many tries till I got some good parts, still learning to deal with defects . The spun bellmouths will only fit the old Bings but any other sizes would be no big headache once you have a core to form the spun sheet alu - well, again after some practising .
To get more space under the B-Rapide tank for the Bings I had to do some cutting and welding, allright, I was not the first to mess around under there so no headaches here . Not much of headaches for me anyway when originality is concerned, my criteria is classic looks according to the time period , so no obviously modern components acceptable for me.

Vic
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Vincent Brake

Well Known and Active Website User
VOC Member
Ha, nice all in all.
Can't wait to get on it.

But first is still this Schaublin lathe, ready end January.

To Nigel.
I guess it must be due to same birthday.
And near to the year as well.

Victor, we will catch up.

Cheers all
 

oexing

Well Known and Active Website User
VOC Member
Bronce castings ? They look like brazed up from segments. Why was decided on bronce , alu would be more suitable as bronce is even heavier than steel, 8,9 versus 7,85 factor ? When fabricating an elbow I´d take thinwalled stainless segments for welding up a carb stub, less heat transfer to carb and when bead blasted it looks a bit like nickel plated.

Vic
 

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