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Cox .09 r/c carburetor

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Cox .09 r/c carburetor

Old 01-11-2015, 08:59 PM
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Steve Westphal
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Default Cox .09 r/c carburetor

Where can one find an R/C carburetor for the Cox TD .09
Old 01-11-2015, 09:47 PM
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Pond Skipper
 
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http://coxengines.ca/cox-.049-.050-....-assembly.html


Small glitch its for the .050 look at this pic of two of mine for comparison a .050 and .09 RC engines note the .09 carb is a bit bigger.
You will have to use plumbers tape to increase the dia of the carb threads for a tight fit into the carb body.
This has been done by others. The TD .09 makes a lot of power enjoy! You can flare out the venturi some or source a tarno 1/2A carb.


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Old 01-12-2015, 08:37 AM
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I think you would need to look on eba- An AP .09 - .15 carb has enough meat on to convert, but there is no airbleed. It is 9mm, or .354" dia. The Cox .09 is a 5/16" - 32 thread (.312") It would be somewhat hard to hold in a lathe to turn the dia/thread. You can get the motor from H King for about the same $ as just a carb may be, and it puts out about the same power and comes with a muffler of sorts. http://hobbyking.com/hobbyking/store...ow_Engine.html
Old 01-12-2015, 08:44 AM
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The AP comes with a major weight gain though. It weighs in equal to a TD. 15 with a throttle sleeve
Old 01-12-2015, 08:53 AM
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I suppose so. I have personally never found too much of a problem with motor weight. I normally pick a heavier motor for noseweight, which seems to happen more often than not. At least for the piddly stuff that I fly. Actually the motor in the HKing ad is a .15. (.135 really) But they are ball bearing and ABC, so it is comparable to the Cox. Remember that the Cox with a throttle sleeve has no muffler too. I have been getting away from the old Cox stuff, mostly because of the engine kill and muffler rule at my club. I have to drive over an hour to fly the unmuffled stuff.
Old 01-12-2015, 12:54 PM
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There was also an .09 Tarno carb produced at one stage-but this is very rare-much rarer than the 049 size Tarno. Another possibility would be to find an Enya or OS carb with a suitable shank size and thread that 5/16"-32....(it won't matter that it has a couple of diametric screw holes in the shank section)-an original Cox 09 RC carb is likely to be pricey (Cox Int'l don't list them-but they do list the 05 one at $35)-so you can probably expect to pay that sort of money for one...but for that you might well pick up a complete second hand Enya 09 or OS 10 on Ebay.

What is your main driver here-do you want:
(1) Specifically to throttle a TD 09? [again why-power? light weight?]
(2) An 09 with a throttle-in which case there are a variety of alternatives
(3) a compact high power throttleable 09? [in which case the options shrink considerably]
(4) High power in an 09/10 package with throttling ?

Each of these variations has a number of possible solutions-more advice can be forthcoming if you clarify what you're after a throttled TD 09 for...

ChrisM
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Old 01-12-2015, 01:02 PM
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For max power I sourced a Medallion 09 just to rob the throttle sleeve to put on the 09 ...as an example.
I have to RC 09 all sexy with their mufflers but wanted low weight max rpm.
Old 01-12-2015, 01:05 PM
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The LA .10 carb is plastic and still needs to be turned down and threaded. You would need to buy a remote needle too. The AP is about $14. I am sure the OS would be much more than that, especially with a remote needle added. I found the AP .09 a good motor, slightly faster than the TD, and only slightly less than the OS LA. I have not worn either one out yet, but the LA may win with the idle. My TD with no carb is 2.8 oz, while the AP is 4.9oz. Ya, that is a lot more.

Last edited by aspeed; 01-12-2015 at 01:09 PM.
Old 01-12-2015, 01:17 PM
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Then there is the Parra http://www.clubtamaran.com/Parra%201.5%20INFO.htm I didn't see the price, but noticed an rc version. I would guess around $150 but that is just a guess.
Old 01-12-2015, 01:33 PM
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Originally Posted by aspeed View Post
The LA .10 carb is plastic and still needs to be turned down and threaded. You would need to buy a remote needle too. The AP is about $14. I am sure the OS would be much more than that, especially with a remote needle added. I found the AP .09 a good motor, slightly faster than the TD, and only slightly less than the OS LA. I have not worn either one out yet, but the LA may win with the idle. My TD with no carb is 2.8 oz, while the AP is 4.9oz. Ya, that is a lot more.
I must confess I was thinking more in terms of a Max-10 FSR or 10FP carb, or an Enya 09 or 11 one. In my personal opinion the APs are let down by their very restrictive mufflers....and their weight. The only engines comparable with the TD 09 for size and weight would be the Cipolla 09s-some versions of which were RC. If weight is not so much of a consideration then simply going for a Enya 09 or OS 10 is the easy and economical option. Then you can up the ante a bit with an Enya 11 or a Webra Speedy 1.8-or as CP has demonstrated several years back-an ASP 12-which are both cheap, readily available and potent. The Parra engines no doubt are superb-but likely to cost you an arm and several other limbs...!

ChrisM
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Old 01-12-2015, 01:39 PM
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I think Mr Skipper likes to go fast. Parra is just an option.
Old 01-12-2015, 04:49 PM
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hwy not get a Norvel 074... or buy the 074 carb and put on it. dont worry about threading it just glue the darn thing in there. use JB weld type epoxy
Old 01-12-2015, 04:50 PM
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why not
Old 02-04-2015, 08:56 AM
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A Tarno carb has been available on ebay for $50.00. It hasn't sold in a couple of listings. It may be relisted. It is about what I paid for one last year. This is just a heads up and I am not the listing party.
Ken
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http://www.ebay.com/itm/TARNO-CARB-F...item4d2c3b5079
Old 02-04-2015, 12:22 PM
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Or a cylinder throttle sleeve? Not sure if they were ever made, but it would be fairly easy to make one up on a lathe.
Old 02-04-2015, 01:15 PM
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I have one for the 09 the way I pulled it off was by buying a Medallion engine on ebay and robbing the throttle sleeve for der TD.
Old 02-11-2015, 07:19 AM
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The TD .09 throttles well IF you can get a throttle with an adjustable airbleed. As the text explains, the throttle is from an MVVS .12 and it has an adjustable airbleed. It's rugged and very well made.

I can't remember where I got it, but I'll do some digging and let you know. As I recall, I turned down the bottom stem, and glued it in with JB Weld. The engine hasn't been flown, just a few hours of bench running and the carb has held in place just fine. https://www.youtube.com/watch?v=o-uvAb-vQgM





Last edited by AndyW; 02-11-2015 at 07:34 AM.
Old 02-11-2015, 01:22 PM
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That video shows a nice running engine Andy-the 09 and 12 MVVS throttles are good-and used to be available from Hobby Club-a quick check confirms they still have the 1.5cc sized one listed for $27.50....and it has an 8mm shank......that means it could be threaded 5/16-32 without any issues-5/16" is 7.94mm-so a normal split die would do the job easily-you wouldn't even need to machine the shank down...

ChrisM
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Old 02-21-2015, 07:42 PM
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Cox did make a barrel type RC throttle for the .09 medallion.
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Old 02-21-2015, 08:09 PM
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That muffler really doesnt work too well as a RC throttle, the spring steel clip can be fussy when connected to a servo.
Here is a pic, I sourced a Medallion 09 some come with throttle sleeves for ye ol TD.


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Old 02-22-2015, 04:35 AM
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The main limiting factor in using a Cox TD 09 as an RC engine is the glo head. when Cox made their own TD .09 RC they went to a standard glo-plug so they could utilize an "Idle-Bar" type plug to keep it running when you go to low throttle. Trying to get great throttling out of a stock TD is like pulling a cart with a race horse. There are a lot of .09 and .10 engines out there that throttle well but I do understand the need to tinker.
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Old 02-22-2015, 04:54 AM
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That has all changed now when there are Turbo plugs available with different heat ranges. With something like the OS P4 or P3 plug you can have both good high end power and good throttling.

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