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Post  fredvon4 on Sat Apr 04, 2020 10:21 am

Will there enough qty?
pre orders needed?
color options?   I am thinking all of my specialty engines need a color coordinated back plate...would even pay extra for custom anodizing...I hate the plastic black ones
Certainly begs for vented and non vented
You guys rock

can they be fitted with Matts fine thread needles?

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Post  roddie on Sat Apr 04, 2020 1:20 pm

I'd like to see the fuel pick-up nipple be formed into the OEM nipple shape.. to guard against the fuel-line slipping-off.

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VS.

Aluminium backplates - Page 2 Plasti10

No doubt that the shape would be more costly to produce.. but Cox made it that way for a reason. If the pick-up/hose falls-off.. it will open up a troubleshooting can of worms, because the engine "will run".. but only until that nipple starts sucking air.

In my opinion; the nipple-connections' integrity is as crucial as any of the other points that have been discussed here.
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Post  roddie on Sat Apr 04, 2020 1:52 pm

roddie wrote:

No doubt that the shape would be more costly to produce.. but Cox made it that way for a reason.

Maybe the pick-up nipple could be a "separate-part"?

It would mean sourcing a threaded-nipple; short enough to fit inside the 5cc tank-bowl once installed.. and having a threaded-length "short-enough" so-as not to impede the function of the venturi.. once installed.

The current-designs' nipple-boss dia. of .130" could be increased to provide for this.. and its' bore-dia. increased from .062" to whatever size needed for tapping the subject-nipples' threads. Incidentally; the OEM nipples' inlet-dia. is a smaller .046". I checked several of my backplates; including one having a .082" air-intake. The fuel-inlet dia. was the same .046" on all.

There should be an abundance of tiny stainless-steel threaded-nipples on the market; primarily for medical applications.


Last edited by roddie on Sat Apr 04, 2020 2:23 pm; edited 1 time in total (Reason for editing : specs./options)
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Post  Cox International on Sat Apr 04, 2020 1:55 pm

We will be making 1,000 units, so there will be plenty of stock.

Matt and us will be discussing anodizing.

Will have to confer with Matt but would suggest we make them all with the smallest venturi hole and then bore some open for the couple of other sizes.

BTW, the nipple on the plastic backpalte IS OEM; we had them made on the OEM Cox mould.
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Post  roddie on Sat Apr 04, 2020 2:29 pm

Cox International wrote:

BTW, the nipple on the plastic backpalte IS OEM; we had them made on the OEM Cox mould.

I see.. We could then assume that there was a post procedure done by Cox, that formed the nipple into the phalic-shape Embarassed that it is.

I edited my previous post with what "might be" helpful info.
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Post  Cribbs74 on Sat Apr 04, 2020 2:36 pm

It’s called a barb Roddie. Get your mind outta the gutter! Laughing
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Post  roddie on Sat Apr 04, 2020 2:38 pm

Cribbs74 wrote:It’s called a barb Roddie. Get your mind outta the gutter! Laughing

That's the word I was looking for! Thumbs Up
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Post  roddie on Sat Apr 04, 2020 2:53 pm

My previous posts haven't given credit where credit is due. I/we certainly appreciate all that Cox International (Bernie) and EXModel Engines (Matt) are continually doing; investing capital/time/energy into preserving Cox engines for us and the next generation to enjoy. I hope that you interpret my comments with enthusiasm.. and a grain of salt.
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Post  Cox International on Sat Apr 04, 2020 3:15 pm

roddie wrote:My previous posts haven't given credit where credit is due. I/we certainly appreciate all that Cox International (Bernie) and EXModel Engines (Matt) are continually doing; investing capital/time/energy into preserving Cox engines for us and the next generation to enjoy. I hope that you interpret my comments with enthusiasm.. and a grain of salt.

Feedback / support / criticism … all welcome as you are invariably the people that buy our products and permit us our paycheques Smile


Last edited by Cox International on Sat Apr 04, 2020 3:16 pm; edited 2 times in total (Reason for editing : Typo)
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Post  944_Jim on Sat Apr 04, 2020 5:05 pm

Who's Barb?
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Post  roddie on Sat Apr 04, 2020 5:30 pm

944_Jim wrote:Who's Barb?

She's the gal who was in charge of the hoses.
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Post  Basswood on Sun Apr 05, 2020 5:10 pm

Matt Very nice.
There is just something about machined aluminum that does it for me,and the anodizing is the cherry on the cake.
But something that crossed my mind. what about leaks on the tank edge seal? could an O ring be the way to go?

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Post  Cox International on Sun Apr 05, 2020 9:01 pm

Basswood wrote:Matt Very nice.
There is just something about machined aluminum that does it for me,and the anodizing is the cherry on the cake.
But something that crossed my mind. what about leaks on the tank edge seal? could an O ring be the way to go?

Basswood

Jumping in here....

The zinc backplates that Cox manufactured for decades seemed to seal quite well, so not expecting the alu ones to not seal but certainly something we can look into.

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Post  germanbuddy on Mon Apr 06, 2020 3:20 am

one small groove for black rubber O ring gasket could be a smart solution.
I belive waterproof (diver) wristwatches have such.

stay home...stay SAFE.

cheers
Peter
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Post  Oldenginerod on Mon Apr 06, 2020 3:56 am

I'm assuming that the prototype will be rigorously tested by the developers. If a sealing issue emerges, I'm sure they'll sort it out. If they can't get the original Cox design to work, then they'll probably need to start modifying the design until they get something that does.
I have every confidence in Bernie & Matt. Keep it up fellas. Well done.
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Post  getback on Mon Apr 06, 2020 6:54 am

I will agree with roddie about the Barbed (one) fuel nipple , if that can bee incorporated into the design . That was a Good 3 Min. Laugh though Thanks !!
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Post  63expert on Mon Apr 06, 2020 7:17 am

This is truly great news!!!

The “Barb” feature would be easy to incorporate. It would most likely involve a custom ground cutter and an additional ~ 1 minute machine time, depending on chip to chip tool change duration. The barb is a very desirable feature!

I would hope some sort of fine thread needle would be specified.

The “drill out” for desired choke diameter on the Venturi is not likely a good choice as the radius going to the mixing chamber will be destroyed and turbulent airflow would result. Maybe offer a “Stunt” and a “Racing” version with small and large choke areas.

Put me down for at least two of each Wink
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Post  Marleysky on Mon Apr 06, 2020 8:48 am

Cribbs74 wrote:It’s called a barb Roddie. Get your mind outta the gutter! Laughing

Barb, yes I remember her well...

You could call it the “cut” and the “uncut” version!!
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Post  NEW222 on Mon Apr 06, 2020 1:23 pm

Marleysky wrote:
Cribbs74 wrote:It’s called a barb Roddie. Get your mind outta the gutter! Laughing

Barb, yes I remember her well...

You could call it the “cut” and the “uncut” version!!

Ok. So who wants to come over and clean up my computer from teh drink I just spit on it after reading this. Lol. Very Happy
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Post  Basswood on Tue Apr 07, 2020 10:56 pm

MATT/BERNIE
I'M HAPPY TO SEE YOU GUYS ARE TAKING ON THIS CHALLENGE TO MAKE AVAILABLE A QUALITY ALTERNATIVE TO THE STOCK BACK PLATES.
I THINK THERE IS A MARKET OUT THERE FOR THE ALUMINUM MACHINED ONES AND I'M LOOKING FORWARD TO THEM, AND WILL PURCHASE SEVERAL FOR MY ENGINES.
CAN'T WAIT TO SEE THE FINAL PRODUCT.
THANKS, BASSWOOD
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