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TR6 TR6 Carb Diaphragm

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TR6oldtimer

TR6oldtimer

Darth Vader
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Well, just plodding along with the re-build of my Strombergs. Whilst apart (I really enjoy the opportunity to use whilst) I noted the original diaphragms are made from a more supple rubber then the replacements. The flexibility of the old is very much more then the new.

So, keep the old (they are in excellent shape) or use the new, stouter ones?

It seems to me the stiffness of the new ones will impede the movement of the piston assembly.

Or does it really matter.
 
TR6oldtimer said:
Well, just plodding along with the re-build of my Strombergs. Whilst apart (I really enjoy the opportunity to use whilst)
Click to expand...

LOL Ray.

As long as they are matched I think it OK.
 
If it ain't broke ...
 
... and carry one of the replacements as a spare. ZipLoc makes a little hard plastic container (like you might use to store one small serving of macaroni) that is a perfect fit for an inverted diaphragm, keeps it from getting cruched among the other stuff in the box, bag or whatever you carry the extra stuff in.
 
Ray,
After I had my carbs rebuilt three years ago I had some trouble while on a trip. Turned out the new diaphragms were torn. I went to Peter C and got a pair that were of obvious better quality and have not had any trouble since.
 
All of the diaphragms I've seen in the last 10 years or so seem to made of thermoplastic elastomer - it's cheaper. All seem "stiff" out of the bag, but really soften up when exposed to fuel vapors in the carb. Maybe too soft... Two of the 3 carbs on my 6 take the vapors from the valve cover breather. By coincidence those diaphragms fail every 2-3 years, while the other does not. Probably the chemical cats & dogs & organic acids in the exhaust.
 
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