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| Maiwald Makeover....... |
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| millwright:
David, I never doubted it would be runner, I think all your orphans know that. And im sure you wont be happy till its 100%. Mmm easiest option new alloy piston, but will you be happy with that? :beer: John |
| Stilldrillin:
Hi John. Thanks for your confidence! :thumbup: An alloy piston will expand at the same rate as the cylinder. But, will it gall. Or will the lube, (5W-30 full synthetic), keep things sweet? Don't like alloy for cylinders. :( David D |
| sbwhart:
You beat that one into submision Dave it's certainly a bit of a flapper a nice interesting runner well done :clap: :clap: :clap: :clap: :clap: MMMM new piston hey ? what about cast iron. Stew |
| Stilldrillin:
Thanks Stew! Cast iron? Never thought of that material! Though, just a replacement brass piston, is most likely, so far...... :thumbup: I think I should have shown this video first. Taken after the previous one, it shows the engine puffing out oil smoke, before stopping........ Total thick oil, run time was only some 2 minutes. I guess slide oil doesn't like elevated temperatures! David D |
| NickG:
I was about to say the same as you all just have! Don't like ali for cylinders either but easiest would be to do an ali piston - then you get the gaulling issue but as you say the engine oil might keep it sweet. Amazing the difference the oil makes, it helps it seal as well as reduce friction. If you have a different material for cyl and piston I guess one will expand more than the other and either seize it up or make it too loose eventually. I was going to say cast iron for both ... it's the best option for any engine in my opinion, though with this graphite may give you very good results, wouldn't need oil and you could leave the aluminium. Nick |
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