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Model hit and miss identity


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  #1  
Old 12-29-2016, 10:19:09 PM
Frank Klenk Frank Klenk is offline
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Default Model hit and miss identity

Hello all, I am new here. I am an engine collector, my collection consists of model airplane engines and I just recently acquired this hit and miss model engine. First of all would anyone know what this is called and is it a model of a full scale or? I found a couple minor issues and made the repairs, leaking valves. I've watched a few videos on how these run. It seems to me the 2 gears running off the flywheel that opens the exhaust valve are timed. What is the procedure? I do plan to run this so any help is appreciated. Thanks.
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Old 12-29-2016, 10:37:04 PM
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Junkologist Junkologist is offline
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Default Re: Model hit and miss identity

Your engine is known as the Odds & Ends engine. It was designed by Phil Duclos and the plans were published in Home Shop Machinist Magazine.

To time the gears properly, I usually mesh them so the exhaust valve closes just as the piston reaches top dead center at the end of the exhaust stroke. It can close a fuzz earlier, but not after TDC. Once you have it timed properly, you will find that the exhaust valve will open just before the piston reaches bottom dead center at the end of the power stroke. If the engine ran before you acquired it, the timing should be ok though.

Looks like you have a nice little model there and I'm sure you will enjoy it once you get it running.
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Old 12-30-2016, 05:42:36 PM
Frank Klenk Frank Klenk is offline
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Default Re: Model hit and miss identity

Thank you for the good information. The crankshaft journal bolts were very lose so I was suspicious of the timing. I think he may of lifted the crank out to check the ring. Timing was off and it is reset now.
More questions...
What oil should I put in the lubricator on the sleeve?
What fuel should I use? Is Coleman camp stove fuel okay? What oil do I mix with it?
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Old 12-30-2016, 08:13:19 PM
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Default Re: Model hit and miss identity

Any light engine oil is fine for the lubricator. Lots of guys just run mixed fuel and don't even bother with the lubricator, but I like to give my engines all the lube they can stand. Coleman fuel (naphtha) is the perfect fuel for these models. No smell, no residue, no problems. Some guys like to mix WD40 with the fuel and others use 2 cycle oil.
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Old 12-30-2016, 09:15:25 PM
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Tom Jamboretz Tom Jamboretz is offline
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Default Re: Model hit and miss identity

These are really nice engines. The instructions are the best for any engine I have made. I run mine regular gasoline with light oil in the oiler. I'm sure you will enjoy this one. TJ
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Old 12-31-2016, 04:56:47 PM
Frank Klenk Frank Klenk is offline
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Default Re: Model hit and miss identity

I fueled it up and after some coaxing I got a few pops and sputters, I managed a couple short runs, the governor kicked in and the engine quit. I noticed compression was soft again. I trimmed the gasket a bit on the valve body, no change. Thinking back, the gent I acquired this from mentioned he thought it needed rings as he had run it a lot. I thought I had it licked when I resealed the valve body. So, I pulled the piston out, the top ring was broken. No scores in the liner. So, would anyone have 2 piston rings they can spare?
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Old 12-31-2016, 06:35:11 PM
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Tom Jamboretz Tom Jamboretz is offline
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Default Re: Model hit and miss identity

Here is where I get all my rings from models to 60" rings. Very nice man. TJ

http://pistonrings.net/ Otto Engine
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Old 01-13-2019, 03:28:07 PM
Frank Klenk Frank Klenk is offline
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Default Re: Model hit and miss identity

I bought some piston rings from Bjorn Baal in Texas, he bought Frank Bowman's ring business. Rings are a perfect fit and it runs just fine! Check it out.

---------- Post added at 02:28:07 PM ---------- Previous post was at 02:21:47 PM ----------

The link does not work, how do I edit?
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Old 01-13-2019, 05:23:54 PM
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Default Re: Model hit and miss identity

Quote:
Originally Posted by Frank Klenk View Post
I bought some piston rings from Bjorn Baal in Texas, he bought Frank Bowman's ring business. Rings are a perfect fit and it runs just fine! Check it out.

---------- Post added at 02:28:07 PM ---------- Previous post was at 02:21:47 PM ----------

The link does not work, how do I edit?

Here this one should work.

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Old 01-13-2019, 05:40:09 PM
Frank Klenk Frank Klenk is offline
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Thanks Doc, much appreciated!
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