Gallery, Projects and General > Project Logs
Webster IC Engine build log.
madjackghengis:
Just to chime in a bit, when the valve is open, the head gets much hotter than the cylinder or valve seat, as the stem is the only heat drain. Silver solder works because it's high temp, but locktite was never meant to be in a combustion chamber. In making small valves, I've found using a free cutting steel, whether it be something like 12L14 or one of the easier to machine stainlesses is the key, and machining them with the head towards the headstock, the stem with an extra bit for a center hole, supported in the tailstock until it is to size and the retaining groove cut, (if that is how it is retained) in the stem, then the head contoured with the 45 angle, and a very thin cut off tool made, something about as thick as the valve stem, so cutting off at the head, can be a final finish on the face of the head. Once cut off, a split pair of rounds to clamp the stem in, and then cut off the stub from the tailstock end, has given me good service and heads and stems accurately aligned. Two piece valves can also be riveted together and hold well too. The head needs a shoulder to butt up to, and a taper for the riveted end of the stem to obdurate into to seal it, but it takes great care to keep from bending the stem while riveting it in place. Glad to see everything going along well, and getting closer to firing it up. :bugeye: :beer: Cheers, Jack
raynerd:
Guys, I did reply to these messages but my battery went on the laptop and I lost it, then I lost the will to repeat it! Sorry. Basically I was appreciating that I was being a moron considering loctite!
Finally, I have made a successful valve after many failed attempts at one piece valves. My pal Rodger kindly offered to silver solder some .25" heads onto 3/32" drill rod shafts with me, so that the valves could be machined from these blanks. I haven`t done any silver soldering so although I did consider this method, I couldn`t attempt it. Once I had these blanks at home, it took me 10 minutes to complete the valve, including cross drilling the 3/32" shaft 1mm, which surprisingly went just fine!
I`ll show pictures of the valves once complete and polished, but here is a quick photo of the first valve I made with the 3 other blanks behind it (I only need 2 valves, so we made 2 spares!!)
dbvandy:
--- Quote from: craynerd on April 22, 2011, 11:02:00 AM ---Guys, I did reply to these messages but my battery went on the laptop and I lost it, then I lost the will to repeat it! Sorry. Basically I was appreciating that I was being a moron considering loctite!
Finally, I have made a successful valve after many failed attempts at one piece valves. My pal Rodger kindly offered to silver solder some .25" heads onto 3/32" drill rod shafts with me, so that the valves could be machined from these blanks. I haven`t done any silver soldering so although I did consider this method, I couldn`t attempt it. Once I had these blanks at home, it took me 10 minutes to complete the valve, including cross drilling the 3/32" shaft 1mm, which surprisingly went just fine!
I`ll show pictures of the valves once complete and polished, but here is a quick photo of the first valve I made with the 3 other blanks behind it (I only need 2 valves, so we made 2 spares!!)
--- End quote ---
That looks great...
My mini lathe has a repeatability in the chuck of +/- .0015, so I wonder if that would be too much for the stem to head concentricity. Probably not... A collet would make it zero, so maybe I need to buy more tooling... :clap:
looks good... bout time to make some fumes.. I can't wait to see the ignition work, as I will be ordering one next week....
Doug
NickG:
Looking good Chris, another string to your bow that I am yet to try!
madjackghengis:
Hi Chris, we only say we're making extras because we don't trust ourselves, when we really make "the extra couple" with the hopes the first two will turn out perfect, and we can use the second two for the next engine, right? Your mate did you well with that set of silver soldered blanks, and the valve looks good, I expect you'll be up and running before you know it. Looking very good, and very nice detailing in the build log, can't wait to hear her run. :lol: I was thinking, maybe the cam gear ought to be faced out, so you can look at the cam and gear while it's running. I was just going over some of the earlier posts, just to remember details, and I thought that gear and cam looked good sitting there out in the open. :beer: Cheers, Jack
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