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| NickG:
John, Would like to see your version as I was going to redesign it anyway, it looks a pita to be honest. I was thinking of a couple of ideas but actually, if you say it's hard to keep tight I guess the pinch screw needs to go. The end of the rod could be threaded with a nut either side and maybe a fixed striker? Nick |
| bogstandard:
Nick, It isn't greatly redesigned, but it does make it dead easy to adjust. I put a small flat on the rod that runs thru the cylinder fins just where this bit mounts. You can just use a round bar, it doesn't have to be hex. The screws are 2mm. This adjustment, together with the flame, is very critical. I found that Jan's way kept coming loose, as it was difficult to get in to adjust and tighten everything up afterwards. This engine does need a rebuild and bling up. This was the prototype to get two of the engines you are making running together. Rather than running on spirits, as this one does, I have the plans for a micro bunsen burner that runs on gas, but like everything else, I need to make the very high speed drill first, so that I can drill the very small holes required for the burner jets. Then this engine will be completed to how I first envisioned it. John |
| NickG:
John, Thanks for that, the engine looks great. Actually, I had already put a bit of square brass (run out of brass hex but have some steel) to one side to do exactly as you have done (great minds think alike!). I would have forgotten to put a flat on the rod though which would make it difficult to tighten. I couldn't understand why Jan did it the way he did, then I thought the brass might be too heavy and cause the rod to rotate and put unnecessary pressure on the valve, obviously it doesn't have any effect. Thanks, I will follow your method there then. With this type of engine, it's nice to use methods you know work as trouble shooting should be easier at the end. Nick |
| bogstandard:
Nick, I made two of these engines at the same time, and even the pistons and cylinders were interchangeable, and still are, after many hours of running. I first got one running, then using the exact settings, even down to flame position and height from the first, the second was up and running in no time. It is a pain getting that first setting, but I don't think you will have too much trouble if you do your tweaking logically, rather than thru frustration (and it will get frustrating), trying things willy nilly. John |
| NickG:
John, Thanks, I will need all the advice I can get with this one it seems! I think when it's done, if it runs, flame gulpers should be out of my system for good! :offtopic: My list of projects has shrunk... I wanted to do an i.c. engine and a hit & miss air engine to chuck's design and an i.c. hit & miss - but then I thought last night, hang on, why don't I just do a proper hit & miss and that will get the lot out of my system! As with this one, as long as I take a methodical approach, proven design parameters and advice of others that have already been there and done that, I should be ok. Couple more questions if I may: Is your con rod 1/8" brass? I have found some 1/8" brass that looks flat enough so I was planning on using that. Not sure how it'll machine though. I think Jan's version looks a bit thin. My bearings are also slightly different. 12mm OD, 6mm ID for the mains and 7mm OD, 3mm ID for the big end. I bought 2 sets from arc euro so I can use them on my I.C. engine one day! Do you think it is necessary to balance the crank? I was planning on not doing, it's something I can do afterwards but if it's critical I may as well do it to start with. What does your big end look like? Can I see your big end? Could you post a picture of your big end up? :lol: Having trouble wording this one ... Is your crank pin / retaining screw to the original design? I am thinking of simplifying this. On my hot air engine, I just allowed the bearing to slide on the rod and take up it's natural position instead of being restrained, as long as the crank pin is long enough it can't really come off unless the rod got severly bent! Nick |
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