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| Rizzo....... |
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| NickG:
David, it could be, it doesn't take much. Just going off the 32mm and 26mm, the ratio of volumes is only 1.5 (pretty small), as you say, when you take off the diameter of the shaft that doesn't leave much at all, especially when there is quite a bit of 'dead' space in the system. It may require a lot of heat to run? To me the design sounds marginal but you've just shown a working one (can't see it here though) :scratch: I was going to say, different piston material could be a good idea too. Nick |
| Stilldrillin:
Nick. I have literally, just stripped it down again...... The alloy piston has a few small dings/ burrs, and is a little too tight for my liking, in the stainless cylinder. (Expansion, and all that). ::) Think I'll give it a polish, and chamfer the "thrust faces" of the crank bearing to reduce oil drag. If that doesn't work, then I might start to do some alterations....... :thumbup: Did anyone else see what that green one went for? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300567752307&ssPageName=STRK:MEWAX:IT £226.87 !!! Sheesh! :bugeye: David D |
| Bluechip:
Hi Dave Stick at it .. I'm sure the Rizzo will do a Whizzo sooner or later ... :thumbup: Not sure I'd pay that price for the one on feebay ... it's a bit ugly ... Not as ugly as me I admit, but it's running a close second .. Dave BC |
| Stilldrillin:
Gave the piston a deburr & polish. Spacered the two conrods on the crankpin. Put everything back properly, again. :thumbup: Close, but no cigar! It was trying, spinning free for many revs. Always stalling on the vacuum stroke......... ::) So, I added more heat....... :D YEEeee....... HAaarrrrrr!!!!! :ddb: :ddb: :ddb: Tried the lighter flywheel. No difference........ Runs only at medium/ high revs. With a lovely thumping sound. I think, due to the pressure stroke doing all the work. Another Orphan revived! :wave: Happy Little Drillin........ :) David D |
| Bluechip:
There you are, you see. :beer: :beer: :beer: I knew you'd crack it :thumbup: Where's the video then ??? Dave BC |
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