Author Topic: Yet another M90 Microcosm Hit & Miss thread  (Read 525 times)

Steamandoil (Tim)

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Re: Yet another M90 Microcosm Hit & Miss thread
« Reply #30 on: May 27, 2019, 08:33:21 pm »
I need to find some pulleys so I can make it work! But under no load, it appears like its going to be a long lived runner. The rubber o-rings were hard to find but Amazon turned them up. Viton buna 70 20mm x 1mm. So far so good on the new rings although they may not be the same composition as stock. The stock rings got sticky and squeaky after a few million strokes. This caused a roaring and vibration that made the engine hit more often to overcome the stiction I believe. Heat probably added to the deterioration of the elasticity of the o-rings.

At any rate it still runs strong now on the original plug and about the fourth set of batteries.




https://youtu.be/-V4Jc4VpbEA
If you play with fire, you're gonna get burned.

IndianaRog

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Re: Yet another M90 Microcosm Hit & Miss thread
« Reply #31 on: May 28, 2019, 06:21:42 am »
Tim, your little engine runs just as sweet and regular as one could ask...wow!  I have made a note of your O ring source so I can follow your lead should mine develop problems. 

Can you tell me what fuel you are using and what lubricant...then fuel/lube ratio.  I keep experimenting, and currently using 15 parts Zippo to 1 part Marvel Mystery Oil...runs well, but always open to other's learnings as the "manual" is pretty scant on these.

Rog
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Steamandoil (Tim)

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Re: Yet another M90 Microcosm Hit & Miss thread
« Reply #32 on: May 28, 2019, 09:18:29 am »
Roger I am using about 4cc MMO to 60cc camping fuel white gas. When I pulled the piston everything was nice and oily (including the combustion chamber)
I think the fuel lube can be leaner still. I am also cutting back to oiling the crank and rod/wrist pin about once an hour. (30w) oringsandmore.com has about everything covered, I think 25 were just 3 or 4 bucks.

I'm at the point now where I don't think I can hurt it!
If you play with fire, you're gonna get burned.

Nick

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Re: Yet another M90 Microcosm Hit & Miss thread
« Reply #33 on: May 28, 2019, 11:37:45 pm »
Very interesting Tim, you've got that one running perfect  8)
Nick

Steamandoil (Tim)

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Re: Yet another M90 Microcosm Hit & Miss thread
« Reply #34 on: May 29, 2019, 11:53:16 pm »
Thanks Nick!
If you play with fire, you're gonna get burned.

RedRyder

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Re: Yet another M90 Microcosm Hit & Miss thread
« Reply #35 on: June 07, 2019, 06:08:52 pm »
If your new rings start to give resistance, you might get away with just sliding the piston forward enough to put a few drops of synthetic clock oil between the piston rings as they seal almost too well. Nice runner they are. I can't get mine to heat up either. They don't even need water in the hopper unless you make it work hard for an extended period.


They sure are fun!


Gil

 

...Engine of the month winner is Dan's Carette 677/8 ....  photo Carette 677-8     ca 1911 543x640.jpg