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| spuddevans:
Thanks for the vote of confidence Eric :thumbup: :thumbup: I appreciate that. I just had a little look at the timing, it was well out. That sorted there was still a lot of air escaping without doing anything so I removed the speed control valve assembly and attached the air supply to each of the 4 ports in turn. This was to allow me to see just where the air-leakage was coming from. I found that there was some leakage from one piston valve, but it would turn the engine over a half turn or so. However, the other piston valve was leaking worse than the titanic, and wouldnt even attempt to turn the engine over. This is rather frustrating, I had already remade the piston valve once ( well to be truthful I did remake both piston valves ) and I thought I had made, or remade, it to fit the bore. So it looks like I have to remake the remade piston valve :doh: or at worst it might have to be a remake of the piston valve housing :bang: :doh: :bang: Oh well, its all a learning process. I gave up for the moment as I started to get rather frustrated with it all, so me thinks I need to just leave it for today. Tim |
| NickG:
These piston valves sound quite difficult. I haven't seen the plans for this Tim but is there any way you can ream the valve bore and use a ground stock size for the valve? Nick |
| madjackghengis:
--- Quote from: CrewCab on July 31, 2009, 01:53:24 PM --- --- Quote from: spuddevans on July 29, 2009, 12:45:33 PM ---practice makes perfect better. --- End quote --- I like that quote, may I borrow it from time to time Tim :thumbup: and ............. thanks for taking the time to do a complete write up, fine job so far and no doubt it will just get better :beer: CC --- End quote --- A couple of years ago, when my younger sister was suggesting I wasn't practicing my violin enough, I stated "practice makes perfect", and she retorted with "practice makes permanent, perfect practice makes perfect", and that shut me down immediately. As she is a consumate player of the violin as a second instrument, and her first is the cello, which she is quite a performer on, I bowed my head, and accepted the admonishment. Mad Jack :headbang: |
| spuddevans:
--- Quote from: NickG on March 24, 2010, 07:46:46 AM ---These piston valves sound quite difficult. I haven't seen the plans for this Tim but is there any way you can ream the valve bore and use a ground stock size for the valve? Nick --- End quote --- When I originally made the valve bores I did ream them with a 6mm machine reamer. I dont have any 6mm ground bar-stock so I have to turn it down from 8mm stock. This gives me an idea, I might try and rig up my dremel-clone as a kind of a heath-robinson toolpost grinder to finish to size on the remake. I dont know if it will work or not, but I guess it cant make any worse of a job that I have done so far :lol: Once I get this engine running I am going to start on working on my machines and one of the projects I have planned is to make a proper toolpost grinder. ( one of the many projects to upgrade the mill and lathe ) Tim |
| NickG:
Toolpost grinders look very handy indeed. As long as you can keep it still there's no reason the dremel shouldn't work with light cuts. Was just thinking you could buy some 6mm silver steel or something and it should be a really nice it in the reamed bore. I know it's nice to try and use what you already have though. Nick |
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