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Post  Cox International on Mon 12 Aug 2013, 13:12

Am I correct in the assumption that Cox made an 8cc stunt tank version that used the black, flanged, reed retainer as opposed to the circlip?

Just received a new production run and it seems as if I sent the vendor the wrong drawing.

The black reed retainer seems to fit well even though the reed is somewhat tight to turn.
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Post  JPvelo on Mon 12 Aug 2013, 15:36

Yes, I have one that came on a late model black widow.

Jim
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Post  fit90 on Mon 12 Aug 2013, 15:40

I have one on a Black Widow from the late 80's or early 90's.
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Post  Cribbs74 on Mon 12 Aug 2013, 15:50

I have/had some with the black reed retainer.

Ron
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Post  Cox International on Mon 12 Aug 2013, 15:54

Thanks guys. Just wanted to make sure that design actually works.

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Post  Paulgibeault on Tue 13 Aug 2013, 00:32

YES, that tank version is what the Cox Venom had. That was the first time I had seen it.
I prefer this type of tank /reed holder arrangement because the engine crank pin (when things start to wear excessively) does not grind metal off the tank. It just wears away at the nylon reed retainer, thus saving the engine from having to ingest aluminum particles.
It works super!

Cheers, Paul
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Post  RknRusty on Tue 13 Aug 2013, 00:46

The BWs I got with those retainers didn't have crankcase/tank gaskets either. I've been told that some do and some don't come that way. I had one leak because the tank screws were bottoming out. A pair of gaskets fixed that until I tapped them deeper.

Also, I felt like those retainers let the reed move more freely.

Rusty

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Post  Admin on Tue 13 Aug 2013, 02:31

8cc stunt tank - different version -3111

Off my Post 1990 Black Widow. I got the engine used many years ago, I don't remember if it had a gasket on it or not. I do use a gasket with it now.

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Post  tru168 on Tue 13 Aug 2013, 02:41

Nice reed. I believe this type of reed will perform better.
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Post  RknRusty on Tue 13 Aug 2013, 07:33

That is an interesting reed, I've never seen one like that.

Tru, the oval mylar reeds seem to do best for me. The steel reed in the picture would be heavier than others, even heavier than the regular steel oval like Bernie and Matt sell. And I would think a heavy reed would be more sluggish to move than a light one, possibly floating at high RPM. They all become deformed after a while, so that's not an issue for me.

Everyone has their favorite. This oval mylar is mine:
8cc stunt tank - different version XctmpLQs6n8

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Post  Cribbs74 on Tue 13 Aug 2013, 08:33

That reed is very similar to what is found on the Space Bug/Space Bug Jr. Etc.

It works fine on those
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Post  Admin on Tue 13 Aug 2013, 15:00

oops Paranoid I probably shouldn't have posted a picture of that reed. Its still in the "research and development" stage. Just haven't had the time to work on it more. In case you can't tell, its not made by Cox, it was cut from a floppy disk on Jason's die-cut machine. I made one several years ago like this one and I was surprised on how good it performed. It unfortunately self destructed after probably 10-15 runs. Since the original was hand cut with an X-Acto knife, I had trouble reproducing an exact copy. Until Jason came along with his die-cut machine, It was basically abandoned. The reed in the picture seems to be performing close to if not a little better than a rectangular Mylar reed, it still needs a little more adjustments to its design. I haven't worked on the design since last summer. Health issues with a close family member halted that and many other things.

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Post  Jason_WI on Tue 13 Aug 2013, 16:29

Admin wrote:oops :paranoid:I probably shouldn't have posted a picture of that reed. Its still in the "research and development" stage. Just haven't had the time to work on it more. In case you can't tell, its not made by Cox, it was cut from a floppy disk on Jason's die-cut machine. I made one several years ago like this one and I was surprised on how good it performed. It unfortunately self destructed after probably 10-15 runs. Since the original was hand cut with an X-Acto knife, I had trouble reproducing an exact copy. Until Jason came along with his die-cut machine, It was basically abandoned. The reed in the picture seems to be performing close to if not a little better than a rectangular Mylar reed, it still needs a little more adjustments to its design. I haven't worked on the design since last summer. Health issues with a close family member halted that and many other things.
The secret it out! lol! 
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Post  tru168 on Tue 13 Aug 2013, 20:44

RknRusty wrote:That is an interesting reed, I've never seen one like that.

Tru, the oval mylar reeds seem to do best for me. The steel reed in the picture would be heavier than others, even heavier than the regular steel oval like Bernie and Matt sell. And I would think a heavy reed would be more sluggish to move than a light one, possibly floating at high RPM. They all become deformed after a while, so that's not an issue for me.

Everyone has their favorite. This oval mylar is mine:
8cc stunt tank - different version XctmpLQs6n8

Hi Rusty, The reed shown in picture looks heavier for sure. Yes, so far I'm happy with mylar reeds, in some of my Cox engines, it run smoothly with at least couple hundreds of extra RPM compare to metal reeds. metal reeds last a little longer though.
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Post  RknRusty on Tue 13 Aug 2013, 21:03

tru168 wrote:Hi Rusty, The reed shown in picture looks heavier for sure. Yes, so far I'm happy with mylar reeds, in some of my Cox engines, it run smoothly with at least couple hundreds of extra RPM compare to metal reeds. metal reeds last a little longer though.
Maybe. But they beat the anodizing off of the reed seat. I don't know if that's a bad thing or not.

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Post  Cribbs74 on Wed 14 Aug 2013, 07:46

I used a steel reed in my unlimited engine. They seem to work OK. I bet a mylar reed would have performed just as well though.

Ron
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