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"Cox Special MKII .15"



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Glow plug size¿¿??

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Glow plug size¿¿??

Post  MauricioB on Tue Nov 15, 2016 6:09 am

Hi everyone, please, can anyone tell me how much this glow plug thread is? , From already thank you very much!.
(O.S. P4 Turbo)


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Re: Glow plug size¿¿??

Post  Surfer_kris on Wed Nov 16, 2016 3:55 am

The thread is M8x0.75, there is a thread on RCU that show you how to make a matching head for it. The conical part is the most difficult one, but ones you have a good tool for it you can easily make more heads.

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Re: Glow plug size¿¿??

Post  MauricioB on Wed Nov 16, 2016 8:43 am

Surfer_kris wrote:The thread is M8x0.75, there is a thread on RCU that show you how to make a matching head for it. The conical part is the most difficult one, but ones you have a good tool for it you can easily make more heads.


Thank you for your information!
I told him what happened to me, in my Cox Sportsman 0.15 engine, I have adapted a conventional glow plug, since the original engine had burned out, after a lot of use already with the adapted glow plug, I do not know if to over tighten or because Some of the threads of some glow plug are shorter, I damaged the thread of 1/4 x 32, for that reason the idea is to go to a larger diameter using the P4 of OS . For that reason I was in the search of information to evaluate if I can adapt it. Now I'm on my way to get the M8 x 0.75 male to do the job.
Again, thank you very much, when I have news, I will be sharing with you.
Greetings!!


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Re: Glow plug size¿¿??

Post  Surfer_kris on Wed Nov 16, 2016 9:56 am

I don't think that you can easily adapt the head for a Turbo plug if has already been drilled and threaded for a regular glow plug. The Turbo plugs seal with the conical part at the very tip of it. This will need to mate against a corresponding conical area in the head. With a regular thread already in the head, this thread will then go right through the conical part. Perhaps not quite all the way, depending on how the conical part is made, but it will be very close...

I have thought several times that perhaps one could simply fill up the old threads with JB-weld and then make the Turbo plug mating surface. Once under load from the plug it might well be enough, but I have never tested it...

Best would be to use aluminium weld to fill up the old threads I guess, but that is not so easy to do well either...
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Re: Glow plug size¿¿??

Post  Surfer_kris on Wed Nov 16, 2016 12:42 pm

Here is the original article about how to make your own turbo plug heads; AndyW

I have followed that for a few engines during the last ten years and it works well. Here is one I did for a VA .049 MkII RC, it now easily blows the socks of all my cox engines while still throttling well...
(it spins an APC 5.7x3 prop at around 19500rpm on 10% nitro)





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Re: Glow plug size¿¿??

Post  MauricioB on Wed Nov 16, 2016 3:37 pm

Surfer_kris wrote:Here is the original article about how to make your own turbo plug heads; AndyW

I have followed that for a few engines during the last ten years and it works well. Here is one I did for a VA .049 MkII RC, it now easily blows the socks of all my cox engines while still throttling well...
(it spins an APC 5.7x3 prop at around 19500rpm on 10% nitro)






That's a very good job! Thank you very much for this contribution. I'm going to have to locate a turner to see if he can make the piece! .... Thumbs Up
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glow plug source

Post  Larry Mauldin on Mon Feb 26, 2018 2:27 pm

I am looking for a source for a glow plug for non-H WASP .049 engine, preferably in the USA.''Larry
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Re: Glow plug size¿¿??

Post  RknRusty on Mon Feb 26, 2018 4:15 pm

Larry Mauldin wrote:I am looking for a source for a glow plug for non-H WASP .049 engine, preferably in the USA.''Larry
Hi, Larry. Welcome to CEF.
If you don't get an answer here, consider starting your own thread. Someone certainly knows the answer to your question.
Rusty

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Re: Glow plug size¿¿??

Post  Surfer_kris on Mon Feb 26, 2018 4:44 pm

I think the Atwood (non-Holland?) ones used a regular short reach plug?
A medium reach OS or Enya plug might work fine too though, just add an extra gasket for the glow plug.
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Re: Glow plug size¿¿??

Post  Larry Mauldin on Mon Feb 26, 2018 5:14 pm

Thank you for the information. Just need a source, since I am new to this "game".
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Re: Glow plug size¿¿??

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