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Cox Engine of The Month
October-2019
colibriguitars's

Dieselized .049 with no Teflon disk or o-rings.

More info on this engine!



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Post  MauricioB on Wed Jul 20, 2016 10:14 pm

Hello, I appeal to the experience of you who can comment on that type of spark plugs for their engines used Cox 049/051.
I recently did a comparison using a motor gear 051 Tee Dee.
Fuel used:
18% Castor
25% Nitro
Rest Methanol (methyl)
"Cox normal" Spark Plug: 15900/16000 Rpm
Spark plug "insert AP 061": 16000/16100 Rpm
Spark Plug "Cox high compression": 17000 Rpm

Propeller used: 6x4

They think of the following spark plugs???:
http://www.exmodelengines.com/product.php?productid=17662&cat=267&page=1
http://www.exmodelengines.com/product.php?productid=17882&cat=267&page=1
http://www.exmodelengines.com/product.php?productid=17804&cat=267&page=1
https://www.amazon.com/AP-Glow-Plug-061/dp/B00178XPGU
http://brodak.com/engines/glow-plugs/merlin-1-2a-glow-plugs-with-head.html
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Post  1/2A Nut on Wed Jul 20, 2016 11:43 pm

"Glow Plug" they glow they do not spark = )

I like the High Compression glow plugs and use them if I don't use a Nelson glow plug with adapter head.
I also have a Valentine adapter head for the .09 that uses a turbo plug another good choice if you can
fabricate a turbo plug adapter for the .049 you will for sure see a jump in performance.

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Post  MauricioB on Thu Jul 21, 2016 12:19 pm

1/2A Nut wrote:"Glow Plug" they glow they do not spark = )

I like the High Compression glow plugs and use them if I don't use a Nelson glow plug with adapter head.
I also have a Valentine adapter head for the .09 that uses a turbo plug another good choice if you can
fabricate a turbo plug adapter for the .049 you will for sure see a jump in performance.

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Hello !, you're right I made a mistake, it's like you say: "Glow Plug" :-)

Thanks for commenting your experiences, you know or have used in some Cox 049/051 the glow plug 061 AP ??
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Post  RknRusty on Thu Jul 21, 2016 6:04 pm

Mauricio, my favorites are the drop-in type that are held down with a clamp ring like these:
http://brodak.com/engines/glow-plugs/merlin-1-2a-glow-plugs-with-head.html
http://www.exmodelengines.com/product.php?productid=17882&cat=267&page=1
That Brodak link is a pretty good deal, and I think they are all made by Merlin. They are super high compression so take 3-5 copper gaskets. They fit all Cox .049 and Norvel .049 and .061. If I could have my choice of any plug and head, those would be it. A spring-clip type pocket glow igniter fits them too if you have the regular 3-fin clamp ring. the extra cooling 5-fin ring like Bernie sells for the Texaco has to be modified for that type igniter to fit.
Rusty

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Post  MauricioB on Thu Jul 21, 2016 11:29 pm

RknRusty wrote:Mauricio, my favorites are the drop-in type that are held down with a clamp ring like these:
http://brodak.com/engines/glow-plugs/merlin-1-2a-glow-plugs-with-head.html
http://www.exmodelengines.com/product.php?productid=17882&cat=267&page=1
That Brodak link is a pretty good deal, and I think they are all made by Merlin. They are super high compression so take 3-5 copper gaskets. They fit all Cox .049 and Norvel .049 and .061. If I could have my choice of any plug and head, those would be it. A spring-clip type pocket glow igniter fits them too if you have the regular 3-fin clamp ring. the extra cooling 5-fin ring like Bernie sells for the Texaco has to be modified for that type igniter to fit.
Rusty

Rusty !, thanks for the information and leave your comment.
So that I can understand, you say that this type of glow plug should be placed between 3 and 5 units of washers to lowering their compression due to the small dome with and increase the combustion chamber?....Mauricio.
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Post  RknRusty on Fri Jul 22, 2016 12:28 am

That's right Mauricio. Start with 5 and work your way down. I have one TD .051 that is so worn out it only uses one, but that is not the usual case.
Rusty

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Post  MauricioB on Fri Jul 22, 2016 8:55 am

RknRusty wrote:That's right Mauricio. Start with 5 and work your way down. I have one TD .051 that is so worn out it only uses one, but that is not the usual case.
Rusty

Perfect !, I will test and share with you the results! Thank you!...Mauricio.-
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