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Post  mysteryrc Mon Aug 12, 2013 11:54 pm

Please help identify this engine Wp_00016Can you guys identify this engine. It looks like a .049 size. There are no markings other than the prop says thimble drome.


Last edited by mysteryrc on Tue Aug 13, 2013 12:03 am; edited 1 time in total
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Post  mysteryrc Mon Aug 12, 2013 11:59 pm

There is no carb or needles on this engine , just the red backplate with fuel nipple out each side and a screen in the center. Is there some parts missing?
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Post  mysteryrc Tue Aug 13, 2013 12:20 am

I think it might be a vintage cox " series 190" I found one one e-bay that looks pretty much the same. 1960's. Awesome. The one I have looks in way better shape than the one on e-bay. Hopefully only missing the spring. I would still like info if anyone has any to give. thanks looks like I am missing the needle valve as well. Can I fix this?


Last edited by mysteryrc on Tue Aug 13, 2013 12:24 am; edited 1 time in total (Reason for editing : Missing parts)
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Post  JPvelo Tue Aug 13, 2013 12:34 am

That is a product engine, meaning it was sold as part of a ready to fly airplane. Someone more knowledgeable than me can tell you what planes came with that motor. Sounds like it is missing the needle valve. You will need to order a fine thread needle valve from Texastimers.com. It will set you back five bucks. That is the only place I know of to get a needle for that engine.

Jim
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Post  stevej Tue Aug 13, 2013 12:51 am

It's a Cox .049 Product Engine, #190-6 or 190-7, missing the exhaust throttle. Also known as a 'postage stamp' version. A needle and seal should be easy to find for it.

Please help identify this engine Produc13
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Post  dckrsn Tue Aug 13, 2013 3:39 pm

Look out, the only engine in stevej's photo that
uses a fine thread needle(128tpi) is the "190".
As far as I know, the 190 and the Spook were
the only reedies that used the fine thread needle.
Bob
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Post  mysteryrc Tue Aug 13, 2013 9:47 pm

Thanks for all the replies, is this engine worth fixing. Seems like it has tons of compression for a little engine. Also can I get a motor mount for it? Does it just run with standard nitro fuel, I've read some post that say nitro with castor oil? Anything helps. Thanks
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Post  WingingIt74 Wed Aug 14, 2013 8:02 am

It's affectionately called a postage stamp engine, due to the square backplate.  Here is a pic of mine that came out of a red Cox Corsair.  You can see how the throttle set up works.  Mine also has an aftermarket prop and Goldberg postage-stamp engine mount.

Please help identify this engine 65444_298218386955288_239409910_n


Last edited by WingingIt74 on Wed Aug 14, 2013 8:11 am; edited 1 time in total
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Post  WingingIt74 Wed Aug 14, 2013 8:07 am

Also, check the case to see if there is a hole where the throttle spring would go through, see my pic above for the location.
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Post  mysteryrc Wed Aug 14, 2013 12:28 pm

Thanks for the pix wingingit. Looks like I'm missing some parts. Is this a good runner?
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Post  WingingIt74 Wed Aug 14, 2013 12:58 pm

I've never run it yet.
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Post  stevej Wed Aug 14, 2013 1:06 pm

Travis, is that spinner prop nut made of aluminum?
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Post  WingingIt74 Wed Aug 14, 2013 1:10 pm

It's a silver rubber spinner and it was made by Cox, only on their Corsair for a very small run, most were red rubber spinners.

See here for more info on that and the postage stamp mount.
https://www.coxengineforum.com/t1970-odd-ball-engine


Last edited by WingingIt74 on Wed Aug 14, 2013 4:08 pm; edited 1 time in total
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Post  Kim Wed Aug 14, 2013 1:27 pm

Adapters for these backplates show up on Ebay fairly often. This one is running now:

http://www.ebay.com/itm/Carl-Goldberg-ENGINE-MOUNT-for-COX-049-W-PLASTIC-BACKPLATE-NEW-vintage-pack-/151097293416?pt=US_Radio_Control_Control_Line&hash=item232e19ba68

They seem pretty flimsy before mounting to the engine, but lock up good and strong once the backplate screws are tightened.
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Post  WingingIt74 Wed Aug 14, 2013 1:32 pm

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Post  Cribbs74 Wed Aug 14, 2013 6:35 pm

It's an average runner, not good, not bad.

It should have a dual bypass cylinder on it.

The ones I've ran are ok. I do have a mount for them, but they usually get broken down and thrown in the parts bin.

Ron
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Post  mysteryrc Wed Aug 14, 2013 10:45 pm

The motor does not have a hole for the throttle spring. How does the throttle spring work? Does it just change the back pressure, which changes rpm's? Also it looks like a dual bypass, with exhaust ports on each side of the head.
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Post  WingingIt74 Thu Aug 15, 2013 7:38 am

Since it does not have the throttle spring hole, it's less likely that the cylinder is the correct one, since that is one that is ground down for the throttle sleeve.

You are correct in that the throttle sleeve chokes the exhaust.
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Post  mysteryrc Thu Aug 15, 2013 3:52 pm

Does this mean it will only have one speed,or is this bad news?
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Post  WingingIt74 Thu Aug 15, 2013 3:55 pm

An engine without a throttle sleeve is run at WOT, so yes it is only one speed. You can put a throttle sleeve on it and use a return spring or servo so it can return to idle.
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Post  wha-tah-hey Sat Dec 07, 2013 6:29 pm

Cox International has needles, springs, tanks, reeds/holders and other backplates available, so you can refurbish/modify it to suit if you like.
When it gets here, I'm replacing the postage stamp backplate on mine with one suitable to mount in my PT-19 ARF.
Parts're all pretty much interchangeable on extruded-case reed .049s.

Fine for sport use.

Terry
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Post  craig bernard Sat Dec 07, 2013 8:17 pm

i will agree its a product engine i have one identical how it runs i dont know i havent cleaned and put new gasket etc.glow plug is really chewed up on mine.looks like someone used pliers or vice grips on mine. This is ano! NO! always use proper wrench. This engine came as a group lot and want to keep it original because it is the only one like this i have.I think i will have to use vice grips though it wont take a wrench anymore maybe some heat at the same time.It may work the way it is but it looks like crap but has good compression!any Ideas
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Post  JPvelo Sun Dec 08, 2013 8:48 am

craig bernard wrote:i will agree its a product engine i have one identical how it runs i dont know i havent cleaned and put new gasket etc.glow plug is really chewed up on mine.looks like someone used pliers or vice grips on mine. This is ano! NO! always use proper wrench. This engine came as a group lot and want to keep it original because it is the only one like this i have.I think i will have to use vice grips though it wont take a wrench anymore maybe some heat at the same time.It may work the way it is  but it looks like crap but has good compression!any Ideas
Cut a piece of leather from an old belt or something just big enough to wrap around the cylinder. That way you can turn it with a pair if channel locks without doing further damage.

Jim
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Post  GallopingGhostler Sat Mar 08, 2014 7:46 am

The Cox 190's or 290's if purchased separate were decent engines. I remember model plane magazine articles on using them for .049 reed valve CL speed and beginner profiles. They had subport injection (SPI), were used in the Cox RTF P-51 with rubber band on wing in both turtle deck and bubble canopy versions. Goldberge made a nylon mount for them, so they could be used in a balsa plane. Another solution was to cut off the back flanges flush with the screws and make a mount out of two pieces of sheet metal.

They weren't bad considering that they became donor engines when one Figure-9'd their aircraft, scattering parts far and wide enough for an NTSB crash investigation scene.  affraid 
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Post  mysteryrc Fri Aug 15, 2014 11:54 pm

Could someone help me out on putting together a list of parts to get this engine running. I would like to make sure I get the right parts. I will probably buy from cox international.

List:

Needle ( fine thread ?)
Spring starter
Motor mount
Tank
Anything Missing? Any links?
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