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Author Topic: cox 049 - without the integral tank  (Read 1892 times)

Offline mccoy40

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cox 049 - without the integral tank
« on: November 01, 2010, 07:34:41 AM »
Hi All,
     I have one of the new cox 049's that doesn't have a tank - it's got a massive rear venturi though

Are there any commercially available mounts for this type of engine? It was one of the last engines cox made and was very inexpensive. I just have to refit every front end for this type of engine though.


Any help, web sites etc. would be appreciated.


Thanks,

Mccoy40

 /DV
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Joseph Meyer
Philadelphia, PA

Offline minnesotamodeler

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Re: cox 049 - without the integral tank
« Reply #1 on: November 01, 2010, 08:50:46 AM »
You can easily remove the choke tube, leaving a flat mounting surface that will fit any standard firewall.  See attachment.

OR, you can cut a huge slot in all your firewall-equipped planes to accommodate the choke tube.  I think Blackhawk Models offers some kits with a split firewall for the unmodified Surestarts.
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--Ray 
Roseville MN (St. Paul suburb, Arctic Circle)
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Offline LARRY RICE

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Re: cox 049 - without the integral tank
« Reply #2 on: November 01, 2010, 09:03:37 AM »
Yes, Ray we do make some kits that use that engine unaltered and for awhile we offered an adaptor kit to fit it to any of our kits.  Cox did not make these engines Estes made them after they bought Cox and they are not as good as the Cox made engines.   
     Here are some simple options for you:
1- Go to Cox International and buy a tank kit.
2- Cut two pieces of 3/8" x 1/4" maple motor mounts to fit under between the engine and its mount. (Any hard 3/8" material will work).

We stopped making the adaptors because no one wanted them.

Larry
Black Hawk Models
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Offline mccoy40

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Re: cox 049 - without the integral tank
« Reply #3 on: November 02, 2010, 02:08:23 PM »
Thanks! to both of you

I was going to add the hard wood Bracing and I will certianly do that as well as remove the venturi -

Thanks again,


Mccoy40

 ;)
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Joseph Meyer
Philadelphia, PA

Offline George

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Re: cox 049 - without the integral tank
« Reply #4 on: November 02, 2010, 06:46:07 PM »
Quote from: mccoy40 on November 02, 2010, 02:08:23 PM
...I was going to add the hard wood Bracing and I will certianly do that as well as remove the venturi -


If you remove the choke tube you will need shorter screws to connect the backplate to the crankcase. Also, you may want to shorten the shaft on the needle since the choke tube helps support it.

I just use wood standoffs between the backplate and the firewall.

George
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George Bain
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Offline minnesotamodeler

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Re: cox 049 - without the integral tank
« Reply #5 on: November 03, 2010, 01:46:39 PM »
Quote from: George Bain on November 02, 2010, 06:46:07 PM


If you remove the choke tube you will need shorter screws to connect the backplate to the crankcase. Also, you may want to shorten the shaft on the needle since the choke tube helps support it.

I just use wood standoffs between the backplate and the firewall.

George

No.  The standard screws work fine, holes are deep enough to accommodate the extra length.   See the attachment in earlier post, the same screws are used in the last pic. 

Shortening the NV shaft is certainly an option although not necessary in my experience. 
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Offline George

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Re: cox 049 - without the integral tank
« Reply #6 on: November 04, 2010, 11:19:34 AM »
Quote from: minnesotamodeler on November 03, 2010, 01:46:39 PM
No.  The standard screws work fine, holes are deep enough to accommodate the extra length.   See the attachment in earlier post, the same screws are used in the last pic. 

Shortening the NV shaft is certainly an option although not necessary in my experience. 

Oops! You are correct. I tried three engines and they all accommodated the standard screws. Now I'm wondering what I did wrong years ago to make that assumption? Sorry for the mis-information.

One other tidbit...someone had trouble a few years ago because he had used an iron-on covering over the firewall and with the choke tube removed, the covering came loose and was choking the intake. Most CL guys (I think) do not use iron on over the firewall so it should not be a problem.

Here are some product engines. Sure Start and earlier:
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Offline mccoy40

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Re: cox 049 - without the integral tank
« Reply #7 on: November 04, 2010, 02:11:40 PM »
Thanks for that tid bit about the monokote! That's exactly what I was going to do - I'll paint that part instead

Kids love the shiny monokote look alot

 :o
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Joseph Meyer
Philadelphia, PA

Offline minnesotamodeler

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Re: cox 049 - without the integral tank
« Reply #8 on: November 04, 2010, 02:30:02 PM »
  Notice again my original attachment, note at the bottom: If you cut relief notches in the edge of the venturi it will ensure good breathing. 

I agree, iron-on film isn't the best idea on a firewall. 
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--Ray 
Roseville MN (St. Paul suburb, Arctic Circle)
AMA902472

Offline kenneth cook

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Re: cox 049 - without the integral tank
« Reply #9 on: November 04, 2010, 02:32:11 PM »
         I would also like to add a comment. George posted some product engines. The engines in particular that I noticed are what I refer to as the postage stamp backplate. I just called them that for years and its the red one at the bottom. That engine has a needle valve which I believe has the 128 threads per inch. These needles can be used in the Sure Starts. You can press the stock needle out and while its out open that hole to 11/64" I believe. I think you may even be able to go to 3/16". You will achieve a bit more power and a terrific needle to work with. Ken
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