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Fine thread NV assembly for a TD

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Fine thread NV assembly for a TD

Post  OVERLORD on Wed May 09, 2018 8:15 am

This article appeared in RCM of February 1977. It explains how to install a fine thread NV assembly into a TeeDee carb. The magazine can be downloaded from the RC Library on Outerzone.



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Re: Fine thread NV assembly for a TD

Post  JPvelo on Wed May 09, 2018 9:54 am

Interesting, I’ve been contemplating doing something very much like this.
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Re: Fine thread NV assembly for a TD

Post  RknRusty on Wed May 09, 2018 10:23 pm

That's what they had to do before Dale Kirn started making and selling the Kirn-Kraft 128 tpi needle valves. And it turned out to be the premium trick for feeding the TD with pressure bladders. Now days they are readily available, but I see they cost more than twice as much since I last bought one for $15 from TexasTimers.com. Now at $35 bucks makes the old DIY method worth while. It's also perfect, and even simpler, for Norvel 1/2A engines. Same size tubing and all I do believe. My old tutorial is out there somewhere, posted here and at RCGroups. I probably learned it from Ken Cook.

Thanks, Lieven. Hope you are doing well these days.
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Re: Fine thread NV assembly for a TD

Post  getback on Fri May 11, 2018 7:18 am

Good stuff Lieven saved it if i need to change one for some reason , and as Rusty said them things have gotten expensive Shocked Hand Shake
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Re: Fine thread NV assembly for a TD

Post  OVERLORD on Fri May 11, 2018 10:55 am

A few months earlier in the 09/76 issue of RCM, a reader suggests following modification to obtain the same.



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Re: Fine thread NV assembly for a TD

Post  gkamysz on Fri May 11, 2018 3:40 pm

I doubt filing the taper works well because you probably won't have enough thread to screw it in all the way. It may still work for setting mixture, but it probably never close fully. File too much and it may never lean out enough, even with the needle bottom out on the available threads.
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Re: Fine thread NV assembly for a TD

Post  Ken Cook on Sat May 12, 2018 10:04 pm

Drilling out the post of a old glow plug to your desired opening can easily yield a simple venturi. The plug will screw right into the carb body. Drill a hole into the side of one of the hex flats and solder a small piece of 1/8" copper and you can use a remote needle setup from pretty much any of the OS r/c engines which will work using pressure.
 
      The stock TD needle still has a fairly coarse thread which regardless of needle taper is going to offer less than desirable results. While it will work, it's going to be very touchy. To compensate for this, you do one or two things which is raise the nitro or run a smaller prop.

        Due to lack of camera currently, I can't post a pic. I make a banjo fitting from wheel collars. Remove the set screw from the wheel collar and drill out the hole to 1/8". Solder in a small 1/2" stub of 1/8" tubing.  Press a128 TPI needle valve body out of a postage stamp backplate. Prepare the inside of the wheel collar for solder and clean the spraybar by chucking it up in a drill press using some steel wool. DON"T clean around the hole where the fuel exits as this will keep solder from entering  into the hole. Solder the spraybar into the wheel collar aligning the spraybar hole with the copper you soldered into the collar. You just need to fabricate a bracket and you now have a 128 thread remote needle valve which didn't cost $40. I made most of my .25 LA engine needle valves this way. This caught the attention of Phil Cartier who took pictures and was featured in Flying Models Combat section some years back. I used the needle valve assemblies from VA engines for this.
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