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| NickG:
Bernd, I think that's what it needs! I'll do the things I'm thinking about whilst they are fresh in my mind but then I will do as you suggest and move on. I will need something to pick me back up and put a smile on my face after this! I don't want to jump out of the frying pan and into the fire though so I'll be extra careful with my next project! Nick |
| sorveltaja:
Nick, if in doubt about the cylinder and piston not sealing well enough, consider making new ones. But don't do it in a hurry. Especially the lapping is most tedious part, but if done slowly and carefully, it definitely pays back :thumbup:. |
| Darren:
Good advice from Bernd, Good chance in the next six mths you'd read something somewhere, or make something that'll give you a :doh: moment and you'll run back to this little project and get it running just fine :thumbup: I often put things to one side for later when a bit stuck .... :scratch: |
| Bernd:
--- Quote from: Darren on December 30, 2009, 07:43:57 AM ---I often put things to one side for later when a bit stuck .... :scratch: --- End quote --- I must really be stuck by the amount of projects waiting to get finished. :lol: :lol: Bernd |
| NickG:
I had a decent night in the workshop last night. I reamed the cylinder with that adjustable reamer and plenty of oil. The bore is now very round and parallel compared to before. I am not going to bother lapping at this stage as I think the finish is smooth enough. I also turned an aluminium valve - this may be no good, it was more of an exercise to find out what a good fit is. I turned one to a few hundreths of a mm below the bore size and it is a much superior fit than before. Slides freely yet seems very air tight without oil. I will probably give it a try, until I can get some more cast iron. I just need to do the piston to the same standard now. Not sure whether to try aluminium again to keep weight down or gunmetal which would probably be better for the application. It's just the differential expansion that I'm worried about - it could bind up when the bits get hot. I can only try, if it doesn't work after this I'm at a definite loss - the fit is definitely good enough now, and it is the same at any position now. Nick ps I had a reply from a French chap that had made one and showed it on youtube. He was quite helpful with timing figures and directed me to a french forum - this was the first bit I clicked on: http://www.blooo.fr/forum/viewtopic.php?id=2403&p=1 Nice finish on that one! |
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