RS34 and BS34 Choke Plunger Size Comparison

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Re: RS34 and BS34 Choke Plunger Size Comparison

31 May 2025 06:49
#913149
What about the diameter of the plunger?  Are these "raised lip" plungers the same diameter as the regular BS34 plungers?  


 
The raised ones are 10mm like most CV plungers.
The seals are larger though than the ones with the plain surface.


 
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  • Nessism
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Re: RS34 and BS34 Choke Plunger Size Comparison

31 May 2025 07:42
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Nessism post=913089 userid=14026What about the diameter of the plunger?  Are these "raised lip" plungers the same diameter as the regular BS34 plungers?  

I went through my hoard of old plungers and replaced the rubber in all of them.  Sort of proof of concept that I could do it effectively.  I took a damaged VM and another BS plunger, cut the crimped edge off, then measured the cavity diameter.  That helped greatly, in sizing the rubber donut.  Wish I could find Viton grade B sheet here in USA, but it's elusive.  I'm using grade A, which seems to work fine, but it's not as resistant to oxygenated fuels as the grade B stuff.  Better than what was used 50 years ago, though.  
Don't know how bad you want this stuff Ed, below is details of a UK supplier that lists it 

Hey Guy, you English blokes must love Viton, because the sheet I'm using came from there!  Just waiting for someone on ebay to offer some 2mm grade B sheet.  Ordering from an industrial supply store, half a planet away, sounds expensive!
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