Please do not ruin the valve by burnishing the peek against it even with polishing compounds. what you need to be doing is using sand papers from 500 to 1200 and finish off with 2000-3000 grit to polish only the sealing edges of the poppet.
all sand paper polishing are on the lathe and INDIVIDUALLy! Never mate the poppet and valve or valve seat together or turning them against each other! No sand papers in between anything.
Quote from: darkcharisma on April 29, 2021, 08:19:08 PMall sand paper polishing are on the lathe and INDIVIDUALLy! Never mate the poppet and valve or valve seat together or turning them against each other! No sand papers in between anything.I don't necessarily agree with the use of "never", instead advise to be very careful when burnishing the poppet. Careful being defined as only using light pressure and low rpms. Burnishing will not make up for a poorly finished poppet nor seat. Not exercising appropriate care in burnishing can damage the poppet and/or seat. But, if you want to see how close or far off you are from having a perfect seal, paint the poppet's sealing area with a Sharpie, then lightly burnish it against the seat. If you see a nice consistent light ring worn in the markings from the Sharpie, you are ready to assemble....if not, you need to get back to work truing up the poppet. I do realize that making poppets as a DIY, one-off project is a totally different game than making poppets in multiples, for sale on the open market. What works for me as a one-off operation may not necessarily work for everyone else. Perhaps the only absolute is the valve seat and poppet must be 100% true to each other. There are many, many different methods to achieve that state.
Quote from: mackeral5 on May 03, 2021, 09:10:56 PMQuote from: darkcharisma on April 29, 2021, 08:19:08 PMall sand paper polishing are on the lathe and INDIVIDUALLy! Never mate the poppet and valve or valve seat together or turning them against each other! No sand papers in between anything.I don't necessarily agree with the use of "never", instead advise to be very careful when burnishing the poppet. Careful being defined as only using light pressure and low rpms. Burnishing will not make up for a poorly finished poppet nor seat. Not exercising appropriate care in burnishing can damage the poppet and/or seat. But, if you want to see how close or far off you are from having a perfect seal, paint the poppet's sealing area with a Sharpie, then lightly burnish it against the seat. If you see a nice consistent light ring worn in the markings from the Sharpie, you are ready to assemble....if not, you need to get back to work truing up the poppet. I do realize that making poppets as a DIY, one-off project is a totally different game than making poppets in multiples, for sale on the open market. What works for me as a one-off operation may not necessarily work for everyone else. Perhaps the only absolute is the valve seat and poppet must be 100% true to each other. There are many, many different methods to achieve that state.👍, i hope they can control their rpm and pressure. i "never" approach that method so to save me headaches from redo or remake another poppet or valve.
Quote from: darkcharisma on May 03, 2021, 09:22:31 PMQuote from: mackeral5 on May 03, 2021, 09:10:56 PMQuote from: darkcharisma on April 29, 2021, 08:19:08 PMall sand paper polishing are on the lathe and INDIVIDUALLy! Never mate the poppet and valve or valve seat together or turning them against each other! No sand papers in between anything.I don't necessarily agree with the use of "never", instead advise to be very careful when burnishing the poppet. Careful being defined as only using light pressure and low rpms. Burnishing will not make up for a poorly finished poppet nor seat. Not exercising appropriate care in burnishing can damage the poppet and/or seat. But, if you want to see how close or far off you are from having a perfect seal, paint the poppet's sealing area with a Sharpie, then lightly burnish it against the seat. If you see a nice consistent light ring worn in the markings from the Sharpie, you are ready to assemble....if not, you need to get back to work truing up the poppet. I do realize that making poppets as a DIY, one-off project is a totally different game than making poppets in multiples, for sale on the open market. What works for me as a one-off operation may not necessarily work for everyone else. Perhaps the only absolute is the valve seat and poppet must be 100% true to each other. There are many, many different methods to achieve that state.👍, i hope they can control their rpm and pressure. i "never" approach that method so to save me headaches from redo or remake another poppet or valve.Understood. My thoughts are a DIY guy making his own poppet has a certain pedigree, or set of skills implied with the fact that they made it this far, as in they are actually fabricating a poppet with a realistic expectation of success. I would expect that same set of skills to understand the difference between lightly burnishing and trying to pull the stem out of the poppet..... I'm sure selling peek poppets to the masses you saw a full spectrum of ways to ruin a perfectly good valve and seat. Probably has a bit to do with there being very few sources that will sell a loose poppet.