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Author Topic: Placed an order for a Microcosm M-17B!  (Read 683 times)

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Placed an order for a Microcosm M-17B!
« on: May 16, 2022, 09:28:15 pm »
And I've got plans for this little guy. Factory is notorious for putting the timing completely off in the rhubarb with these things far as my research can tell, so putting that right is the first order of business. Then I'll run it in a bit, build a generator out of an old RC plane motor, and maybe see what it's capable of. Poke the limits of those viton piston rings(Really?!), see how low and slow I can get it ticking over, that sorta stuff.

What I ultimately want to do with this engine is situate it somewhere prominently in the middle of an N-scale layout...thinking probably one of Woodland Scenics' layout kits such as the Scenic Valley...and have the engine generate the necessary power to run the trains. N-scale trains really don't need much(A DC locomotive pulling a 15 car train will want about 7-9 volts at around 250-350mA) and the layout won't really have room for more than one train, so I don't think it's too unreasonable an ask of the engine. People run LEDs off of them all the time so surely that won't be a big deal.

From what I can gather looking up other people's videos and posts on these little engines, they're incredibly well made, so I'm confident it won't take much to get the engine up to task. I do have to question the piston ring and I'm sure it will be a source of eternal grief until I put a cast iron replacement in there, but beyond that and the factory's inability to time them properly I don't see any issues with it. Will know more in a couple weeks once it arrives, of course.

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Re: Placed an order for a Microcosm M-17B!
« Reply #1 on: May 17, 2022, 07:09:17 am »

Good luck!

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Re: Placed an order for a Microcosm M-17B!
« Reply #2 on: May 18, 2022, 08:13:38 pm »
Love the idea!  Might take a bit of noodling around with drive pulleys to get a workable generator and engine  rpm for the power output you need, but in theory, sounds great.

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Re: Placed an order for a Microcosm M-17B!
« Reply #3 on: May 19, 2022, 03:13:10 am »
And when the project fails it will be the engine’s fault, of course.

Out of the box my M17B started easily and ran reliably with a gasoline/Marvel fuel mix. Nothing has changed, it is a joy to run and has become my go-to demo engine. But it's a tiny engine and not suited to the labor of spinning a generator.

Although its crank is rigidly supported by bearings, neither end of the connecting rod is bushed. There is no lubrication system for the rod other than manual oiling when refueling. I suspect that the intended continuous running will eat the rod.

The M17B fires every compression stroke and it is not a slow revving engine, so it quickly heats and defeats the cooling capability of its water tank almost to the point of boiling. If not allowed to cool down when refueling, the heat will damage the o-ring.

Heavier flywheels and a more precise carburetor might slow it down a bit. Bushing the rod would allow maintenance instead of replacement but the minuscule wrist pin end probably won’t accept a bushing. The suggested cast iron ring might help if the cylinder material is hard enough to tolerate it.

In my opinion, a larger displacement, more robust hit-and-miss engine such as the M90/ET1 would be better suited to the project. 

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Re: Placed an order for a Microcosm M-17B!
« Reply #4 on: May 20, 2022, 07:46:06 pm »
I’m impressed by the critique here.  Begs the question if there exists any appropriate scale engine for the n gauge dynamo envisioned? Would an engine robust enough for the task appear outsized in the role?

OR

Can sufficient mods be made to do the trick?

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Re: Placed an order for a Microcosm M-17B!
« Reply #5 on: May 20, 2022, 08:50:23 pm »
I’m impressed by the critique here.  Begs the question if there exists any appropriate scale engine for the n gauge dynamo envisioned? Would an engine robust enough for the task appear outsized in the role?

OR

Can sufficient mods be made to do the trick?

I run two N scale trains (5 cars each) along with several other accessories simultaneously using a stepper motor generator turned by my Jensen 51 replica.  Big engine granted, but if an engine can spin a stepper motor (scrapped from a computer printer)... it should easily power your N scale layout.

Rog
my YouTube channel:  https://www.youtube.com/results?search_query=indianarog

my website:  IndianaRog.com

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Re: Placed an order for a Microcosm M-17B!
« Reply #6 on: May 21, 2022, 12:21:51 pm »
No doubt the M17B could power it, but the duration is a question.









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Re: Placed an order for a Microcosm M-17B!
« Reply #7 on: May 21, 2022, 08:58:39 pm »
So one skilled in metalworking might be able to enclose the crank enough to facilitate splash oiling? Ma8ns could be given oilers…..