The disappointing OK Cub

I didn't read all the post yet but this pic show green on the outside of the threads can you imagine what's inside ,.,.,.
And this does Not ,.,.,.,                                              

OK (pun intended) you guys got me all excited to try this engine again, but...…………

I just googled (well binged) OK Cub model engines and went through a bunch of pictures finding a total of none like mine. Until someone shows me a picture of yours that is identical to mine I'm thinking I have a million dollar collectable one-off here.

Bob

getback wrote:I didn't read all the post yet but this pic show green on the outside of the threads can you imagine what's inside ,.,.,. [/url]  

That green equals dollars Eric should anyone desire this valuable one-off engine...……………..

I got a dollar W/free shipping

rsv1cox wrote:OK (pun intended) you guys got me all excited to try this engine again, but...…………

I just googled (well binged) OK Cub model engines and went through a bunch of pictures finding a total of none like mine.  Until someone shows me a picture of yours that is identical to mine I'm thinking I have a million dollar collectable one-off here.  

Bob

Sorry Bob, you don't have anything special there. I think I have three of them. If it has no size marking, or .049, it's an .049 "long stroke". The .074 is nearly identical, but should have .074 on the case. Pretty much everything in this .049 engine is different to the .049B which followed. Even the head is different due to a different size bore. As mentioned, it takes a long plug where the "B" has a short.
Sorry, I have no pictures of mine on hand.

Thanks to Mark Boesen, these pictures are from the old .049 Collectors site.  If the link works, it shows clearly the difference between the models.  The info on the .074 picture states that it has the same case and stroke as the .049, just a larger bore.

.049


.074


https://groups.yahoo.com/neo/groups/049Collectors/photos/albums/408072958

On the long stroke Cub .049 I believe we can divide them thusly: First release Arden plugs, later release with OK long plugs and early runs with serial numbers, later without. Then maybe some NV variants.

rsv1cox wrote:OK (pun intended) you guys got me all excited to try this engine again, but...…………

I just googled (well binged) OK Cub model engines and went through a bunch of pictures finding a total of none like mine.  Until someone shows me a picture of yours that is identical to mine I'm thinking I have a million dollar collectable one-off here.  

Bob

In the center on top of th3 yellow OK box

getback wrote:I got a dollar W/free shipping

Ok...…….again.

Considering the above, I have one dollar do I hear two...…………

Bob

That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #

ticomareado wrote:That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #

Correct. And it didn't have a tank.

GWILLIEFOX wrote:

ticomareado wrote:That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #

Correct.  And it didn't have a tank.

Nice assortment Bill. I have the boxed example on the right, but that's it. From time to time I see the others come up on ebay but I resist the urge.

What's the sparker on the left and does it have an OK Cub connection?

Bob

Looks like a Forster .99. We had one running at the field last week. I have a plane with a Drone .29 converted to glow which we might squeeze the Forster into.
https://www.facebook.com/PhillyFliersCL/videos/vb.513140418756097/645005299244252/?type=2&theater

I was reading on this topic and here I have a tank that I found for my .074 engine during the cleaning I found that the fuel tube was blocked but not by debris or anything else but because it was pushed in and pressed against the tank walls Could be a cause and certainly something to check if you have good flow this could be the cause also I noticed the flat needle look like no point at the t'il its a little strange

Maybe someone here knows the difference between these two engines the two .074 ok one with a 6 on the casing above the crankchaft the other same place but 5 also notice the difference being the two crank prop driver but the engine casing seems identical to me




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The early cases which were introduced in 1949. Your engines are the early versions. They were made in this format until about 1953-1954. The early case engines were made in .049 and in .074 using the same case.  Sometimes and most of the time,  the size is designated on the bottom of the case. One thing as you noticed depending on year of introduction was the prop driver, they changed slightly. The needle of a OK is a piece of crap. No taper, it's a wonder it works and half the time it doesn't. Don't expect it to respond like other needles do. It will work in the engine, it just takes a bit of fiddling. It's critically important that internally in the spraybar, it's clean. You can dress a chamfer on the end of the blunt needle to clean it up a bit which will offer a bit more accuracy in needle position. Most of the time, I just slide tubing over the entire assembly ( Just like the red tubing in your photo)  and just use it as is. I deal with the crudeness of it.

             When I use the stock needle for free flight with a eyedropper, this is very problematic and the height of the dropper is critical, too high and you can't regulate the fuel flow because the fuel passes through the needle regardless of needle position. When running this isn't as much of a issue but prior to starting, it becomes somewhat necessary to pinch off the fuel line prior to starting to prevent the case from flooding.A more accurate needle is to use the Cox spraybar and JB weld it into the case, it offers better reliability and engine run consistency.

               The OK  engines were marketed $2-3 less than the competitors at the time. Therefore, placing high expectations on them isn't something that you should get carried away with. There's a reason for the lower cost, they were to fulfill a niche that was dedicated to the toy market and those initially interested in modeling. They did just that. They're neat and interesting but it can take a few of them to obtain one that's reliable and proves worthy of use.