- Apr 6, 2013
Is anyone aware of a cutter to install these PC teflon spring seals onto factory guides? I have a low mile head which doesn't need new KW bronze guides.
chaztuna, apparently Teflon is a brand name of DuPont and is actually PTFE (PolyteTraFluoroEthylene)Cliff,
That web link describes the seal material as "Solid White PC". My limited understanding is that Teflon is described as PTFE or similar. What is solid white PC?
As far as I'm aware the seals being discussed on this thread are a direct replacement for the factory seals, i.e. no cutter required.Is anyone aware of a cutter to install these PC teflon spring seals onto factory guides? I have a low mile head which doesn't need new KW bronze guides.
I had some stock ones with springs and they turned hard as rock after about 15,000 miles. Then the bike started using oil. Some of that riding was in very hot conditions. I replaced them again with stock ones, but I think the teflon ones would have been better. I will put teflon ones in the next time I have the head off.The stock type seals work fine as long as they have the springs. But most suppliers send them out without the springs. You can get them from Old Brits (insist on the springs). Other brands with the springs do not always fit - some are too tall and strike the spring retainer.
I sent a P.M. to Madnorton some time ago asking if AN could start stocking them. I was not worthy of an answer apparently.PTFE ( Teflon ) is the way to go. I hope Andover realizes this one day and dumps rubber/plastic. Who's going to notice originality inside the engine ?
I can't see why they would not be a direct fit with Kibblewhite, stock 750 and 850 having 0.500" OD guides at that location. (I just measured)Is anyone aware of a cutter to install these PC teflon spring seals onto factory guides? I have a low mile head which doesn't need new KW bronze guides.
Ok, I’m gonna have to ask the dumb question here... what does PC in the name ‘PC style’ mean / stand for ?chaztuna, apparently Teflon is a brand name of DuPont and is actually PTFE (PolyteTraFluoroEthylene)
This is the sales blurb from the KW website...
"SEAL STYLE 6KPMI® solid white PC Style valve stem seals are available for builders who prefer a PC Style seal. These seals incorporate a clasp around the body of the seal and a choker spring around the neck of the seal. KPMI® solid white “PC Style” seals are manufactured from PTFE. PTFE material does not have “memory” and therefore is subject to creep. Creep allows the seal to conform to mating surfaces. Also, fillers have been used to keep the material stable and to reduce friction. PTFE is known to retain its mechanical properties at temperatures as high as 500°F. The twin spring design provides continuous tension on the valve guide and the stem of the valve. When your build creates extreme conditions…arm it with KPMI® “PC Style” Valve Stem Seals!"
I think "Solid White" may be another product name.
If you are buying some, would you consider buying extra's and posting some to me? as KW quote $25 to send 4 seals to Switzerland which is bonkers.
Well working for Dana many years ago has its advantages.I was wondering the same thing. I cannot see any info. on the KW site.
Cast iron is self lubricating from the high carbon content, the Kibblewhite nickel aluminium bronze guides are also self lubricating, the ones to worry about are the plain bronze ones made down to a price. I hardly even run my lathe with coolant and the cast iron saddle runs over the cast iron bed dry as it was designed.Is that so?
I read that as well, and I also found this: