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Hit & Miss Gas Engine Discussion

New Unidentified Toy (possibly Polish)


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  #1  
Old 10-07-2009, 11:21:49 PM
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Default New Unidentified Toy (possibly Polish)

Hey guys, anyone ever seen one like this before??
It's a 2-cycle engine with a round base, chain drive mag & spark plug igntion. It's got two 6 spoke flywheels and a great big muffler. The flywheels are both held on via a threaded crankshaft & nut combination and the previous owner is sure it came from Poland.
The base makes us think that it's early, but the chain drive and the threaded crank make it seem much later.

Help please...

Jonathan
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Old 10-08-2009, 04:59:31 AM
Wayne Timms Wayne Timms is offline
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Default Re: New Unidentified Toy (possibly Polish)

Hi Jonathan,

Nice looking engine.

I can't see any transfer port from the crankcase to the cylinder, if I am right, (humour me) could you please take the sparkplug out and shine a light in and see if there is a valve in the crown of the piston?

Regards,
Wayne

www.bluefuel-whitesmoke.com
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Old 10-08-2009, 07:39:01 AM
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Default Re: New Unidentified Toy (possibly Polish)

Wayne
I'll do you one better, I'll take the cylinder off (it was loose when we got it) I'll try to get some more shots tonight.

Jonathan
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Old 10-08-2009, 07:05:31 PM
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Default Re: New Unidentified Toy (possibly Polish)

Wayne,
You win the prize!!
Valve in piston as shown:
Also a few more shots to see if anyone can ID this??
It appears to be hand throttled as there is no governor of any kind...
We're pretty sure the mag isn't original as the mag bracket has been modified, but the chain sprocket appears to be original.
The serial number (we think) is 244 and is stamped on the face of the flywheel
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Old 10-10-2009, 08:41:04 AM
Wayne Timms Wayne Timms is offline
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Default Re: New Unidentified Toy (possibly Polish)

Hi Jonathan,

So what's the prize?

I have an engine which has the valve in the piston, it is similar to yours but not the same. The magneto is chain drive bolted on a very average steel plate. There are a few of these engines in Australia and apparently they were supplied with printing presses made in Heidelberg, Germany.

Somewhere I have a photo of one in NZ with the name plate, somewhere !

Maybe some of the European collectors might be able to help.

Regards,
Wayne

www.bluefuel-whitesmoke.com
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Old 10-10-2009, 09:04:49 AM
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Default Re: New Unidentified Toy (possibly Polish)

The prize is...
...in Canada, and you'll have to pick it up in person!!

There are definitely similarities between the 2 engines, I'd be glad to see the nameplate if you manage to track one down.
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Old 10-10-2009, 03:10:46 PM
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Default Re: New Unidentified Toy (possibly Polish)

Would one of you gentleman like to explain how this particular two cycle engine works? I'm assuming the valve in the piston closes off on compression stroke? Valve opens on down stroke to allow air & fuel to be forced into the cylinder? Not sure how it pulls or forces the fuel in from the intake. Maybe the valve has to see a certain amount of pressure and suction before it opens and lets the air in and by then the piston has passed by the intake and sucked fuel in already. So the air comes through the valve about the same time the fuel is being sucked into the cylinder? I do not know just guessing.
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Old 10-11-2009, 05:14:39 AM
Wayne Timms Wayne Timms is offline
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Default Re: New Unidentified Toy (possibly Polish)

Hi John,

A very good question. I have never had my engine apart.

I think that until the piston clears the exhaust port, the pressure in the combustion chamber would be greater than the pressure in the crankcase.

So the engine would work like this, the piston would........ sorry, my wife is calling me I must go.......

Jonathan this is your can of worms and your engine is in pieces, you answer the question.

Cheers,
Wayne

P.S I will support whatever you say ! Good Luck !!
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Old 10-11-2009, 08:30:28 AM
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Default Re: New Unidentified Toy (possibly Polish)

Wayne & John

We've owned this engine for just over 48 hours, the time frame on figuring out how it works hasn't been quite long enough for us. So my can of worms will have to stay open a little longer until we figure out exactly how it works (and try to get it running again)

I'll keep you both posted

Jonathan
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Old 10-11-2009, 12:14:16 PM
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Default Re: New Unidentified Toy (possibly Polish)

I saw an 2 cycle marine engine years ago that had a valve in the piston crown. I also saw a very similar type engine in GEM several yrs ago (early80s) The valve was opened by a lobe on the crankshaft. The lobe was also the governor as it was spring loaded and as engine speed increased it moved the lobe away from the valve lifter. This limited the lift, opening and closing duration of the valve and effectivily kept the engine speed within a predetermined range.
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