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Post  getback Wed Feb 19, 2020 8:27 am

With all the hype about these engines and the closing of OK Engines , i purchased these two beauties for $49.oo US shipped ! I think i got a good deal and look forward to running them or at least one of,em . Am hoping to build something for the period that will go slower than the TD varmints i have flown beeing i just can't keep up anymore LOL Anyway here are some pics of the engines , i asked for one with and one without the tanks ... My OK .049 A engines  Ptdc0197
My OK .049 A engines  Ptdc0196
My OK .049 A engines  Ptdc0198
My OK .049 A engines  Ptdc0199
My OK .049 A engines  Ptdc0200
My OK .049 A engines  Ptdc0201   sunny sunny cheers cheers
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Post  balogh Wed Feb 19, 2020 8:58 am

Nice lil' engines Eric..I am wondering how its performance compares to a COX 049 TeeDee or similar, front rotary valve, peer engine, assuming the regular plug in the head impacts the performance the same way we see with COX aftermarket 049 heads for normal (not turbo) plugs..will the OK Cub head and Cox head interchange? If yes, any notable performance change with the COX head?

I read in an old Sceptre Flight report the OK Cub swings a 5' prop (what pitch, what fuel blend etc. are unknown) at 16....-17k rpm. which is not bad.
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Post  smooth_bill Wed Feb 19, 2020 2:24 pm

Eric,

Easy enough to  check, with a Cox 325 glow head.

I bought a few of the later Cub .049 glow head cylinders (some from Mark B. on this forum), and the Cox glow heads work great in them. Cox heads do not fit the OK glow plug cylinders, and the difference is very noticeable.

As I recall, there was no notice of this change in any of the OK publications. We first noticed one of the Cubs that a friend bought used, had a Cox glow head installed? I asked around, and someone mentioned that the Cub glow head cylinders were different than the Cub glow plug cylinders.

Do you have a Cub .049 cylinder clamp/wrench? Very handy tool, and I always use mine when removing heads or cylinders from Cub engines.

Bill
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Post  Mark Boesen Wed Feb 19, 2020 2:36 pm

balogh wrote:Nice lil' engines Eric..I am wondering how its performance compares to a COX 049 TeeDee or similar, front rotary valve, peer engine, assuming the regular plug in the head impacts the performance the same way we see with COX aftermarket 049 heads for normal (not turbo) plugs..will the OK Cub head and Cox head interchange? If yes, any notable performance change with the COX head?

I read in an old Sceptre Flight report the OK Cub swings a 5' prop (what pitch, what fuel blend etc. are unknown) at 16....-17k rpm. which is not bad.

-About the same or less than a Babe Bee.
-Most of these used the red 5x3 Kaysun prop.
-These don't usually have the fit of a Cox, use a higher caster % if possible.
-These might be the later, larger dia. cylinder (c.1958) cylinder and will fit a Cox glowhead and will raise compression a little, works good.
Years ago i ran a 049A on a Baby Ringmaster, pulled it nice, 35' lines.
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Post  balogh Wed Feb 19, 2020 2:40 pm

Thank you Mark!
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Post  OhBee Wed Feb 19, 2020 3:21 pm

Found this in a box of junk years ago..Never run but was stuck tight! All better now! Looks like it would be a trick to mount it to anything.My OK .049 A engines  20200220
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Post  akjgardner Wed Feb 19, 2020 5:49 pm

I bought 5 new ones from Ted , trying to run on , it seems like its not getting fuel from the attached tank, anyone know how these are plumbed in the tank ?
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Post  Marleysky Wed Feb 19, 2020 7:04 pm

Hey! OhBee could you possibly scan and post those Cub instructions??

aKG, attached is a picture of how one of mine is “plumbed” from the tank to the inlet of the NV.   I do have another that has an aluminum tube force fit thru that hole the tube goes through, like the tank would be twisted 90deg so the hole/tube is at the bottom of the tank.

My OK .049 A engines  334db910
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Post  ticomareado Wed Feb 19, 2020 7:13 pm

"Found this in a box of junk years ago..Never run but was stuck tight! All better now! Looks like it would be a trick to mount it to anything."

Disassemble the tank kit from engine, mount tank kit back plate to firewall and then reassemble engine and tank parts to back plate.
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Post  ticomareado Wed Feb 19, 2020 7:21 pm

"I bought 5 new ones from Ted , trying to run on , it seems like its not getting fuel from the attached tank, anyone know how these are plumbed in the tank ?"

Just unscrew all 4 rank screws and look inside and it should be self-explanatory. You sort of "jigalate" the vinyl tube to pick up at bottom of tank or on the side for c/l use. You might need to play with that some.
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Post  akjgardner Wed Feb 19, 2020 9:09 pm

Thanks Guys
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Post  Oldenginerod Thu Feb 20, 2020 1:26 am

The model with the aluminium tube on the left (looking at the engine from the front/prop) were originally designed to have the cylinder horizontal outboard, as they were installed on Comet aircraft. The aluminium tube just goes straight to the rear bottom corner of the tank when the engine is mounted horizontally. I haven't seen one with the fuel line forced through this side of the backplate before, but I have seen them with the fuel line pushed through a hole in the right (looking at the engine from the front/prop) side of the backplate and directed across the tank to the rear bottom corner while the cylinder is mounted vertically. These two engines need to have their spray bars inserted opposite ways to work.
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Post  getback Thu Feb 20, 2020 8:35 am

Hey smooth_Bill what does a Cub .049 cylinder clamp/wrench look like , pretty sure i don't have one but you never know ? Very Happy And thanks for the info guys , would you use a woodie prop for these engines ? Damn Joe i hope you get ur figured out ! I Love This Forum!
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Post  akjgardner Thu Feb 20, 2020 8:48 am

getback wrote:Hey smooth_Bill what does a Cub .049 cylinder clamp/wrench look like , pretty sure i don't have one but you never know ? Very Happy And thanks for the info guys , would you use a woodie prop for these engines ?  Damn Joe i hope you get ur figured out ! I Love This Forum!
Thanks for the help guys . Yea Eric , I hope the Spray bar is not in backward . I tried running it on an external tank , no help but when I prime it , it fires up for a quick burst. Have you ran yours yet ?
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Post  getback Thu Feb 20, 2020 8:54 am

No not yet , calling for snow today been working firewood and seeing doctors to relief me of some my cash !! LOL Did get a tooth pulled though ! My OK .049 A engines  Linsda11 My Dad use to haul me around in one these , i was like 2-3 Cool
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Post  OhBee Thu Feb 20, 2020 12:29 pm

My OK .049 A engines  20200221
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Post  OhBee Thu Feb 20, 2020 12:31 pm

My OK .049 A engines  20200222


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Post  OhBee Thu Feb 20, 2020 12:32 pm

Hopefully you can blow these up and read them!
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Post  akjgardner Thu Feb 20, 2020 12:51 pm

OhBee wrote:Hopefully you can blow these up and read them!
thanks OhBee
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Post  smooth_bill Thu Feb 20, 2020 1:04 pm

Eric,

This link should take you to a page of pictures, and the one on the top left side, is exactly like my Cub tool. I didn't know it also fits the McCoy .049 diesel, and will check mine to see if that is true.

https://www.bing.com/images/search?q=ok+cub+cylinder+removal+tool&qpvt=OK+Cub+cylinder+removel+tool&FORM=IGRE

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Post  Levent Suberk Thu Feb 20, 2020 1:04 pm

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Post  Marleysky Thu Feb 20, 2020 1:29 pm

akjgardner wrote:
OhBee wrote:Hopefully you can blow these up and read them!
thanks OhBee

I second that Thank-you! Thanks
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Post  Eddy Thu Feb 20, 2020 2:49 pm

Very good thread on these Cub engines. Although I never had, nor used one of the cylinder removal tools for the Cub engines. I have used for many years a piece of leather belt that I have cut to the width of the cylinder to be removed. The length of the leather piece should be a few inches longer than the wrap around would be. I have a favorite pair of Craftsman pliers that has longer than normal handles, along with a wider opening at the back of the pliers. I put the engine in a vice and clamp on the beam mounting lugs, just enough to hold the engine and not any more. Put the piston at top dead center, wrap the leather around the cylinder, just below the the top of the last cooling ring. Using the center of the pliers and not the end of, apply heat with a heat gun or a few waves with a torch, to just heat the top of the crankcase where the cylinder screws into and not the cylinder. The cylinder, with a little effort will back out counter clockwise. The factory always has tightened the cylinder way more than I thought they should. As when I re-install the cylinder, I never make it nearly as tight, as when first time removal. Same procedure for the head removal, only use heat somewhat to the head, holding the cylinder with the leather and pliers, while using a good fitting wrench on the head, no pliers on the head at all. It to will come off counter clockwise with ease. I have used this cylinder and head removal procedure since sometime from the 1970's with no damage to the cylinder fins. Future cylinder removal of same engine should not need any heat as you will not need the tight fit as when it left the factory. The .049 engines with the glow head, uses a special tool that reaches into a slot on each side at the top of cylinder, just below the glow head, and with the same addition of some heat for the first time, the cylinder will unscrew the same way. Sorry to make this so lengthy as this is really rather a simple and easy way of the cylinder removal.
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Post  Levent Suberk Thu Feb 20, 2020 3:05 pm

I don't know why cylinders have been so tightened in factory. I once used a ten inch wrench to remove cylinder. Oiled and heated the cylinder, but it was very tight. I bent a Cox wrench too.
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Post  getback Thu Feb 20, 2020 3:24 pm

smooth_bill wrote:Eric,

This link should take you to a page of pictures, and the one on the top left side, is exactly like my Cub tool. I didn't know it also fits the McCoy .049  diesel, and will check mine to see if that is true.

https://www.bing.com/images/search?q=ok+cub+cylinder+removal+tool&qpvt=OK+Cub+cylinder+removel+tool&FORM=IGRE

Bill
 Is this it ?? My OK .049 A engines  Plug_r10


Last edited by getback on Thu Feb 20, 2020 3:25 pm; edited 1 time in total (Reason for editing : add on)
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