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Post  OhBee on Mon Feb 17, 2020 2:28 pm

How thick,and what material should this be made of?
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Post  944_Jim on Mon Feb 17, 2020 3:15 pm

Me personally? While the OEM one is still available from EXModelEngines and Cox International, why bother with making do when I can easilly get new?

Now, If I could buy a bunch of dart shaft o-rings locally, I would try that. Just because I like to try different things...especially since I squeeze a penny head until the penny is dead!

Now if I suspected an o-ring and had some spare fuel line, then I would slice off a piece just for the sake of seeing if that was my issue. The Paul Gilbert document describes the process.

Have you gotten it yet? I think you will find it a quick read that will leave you poised to jump back in quickly. I think I have a copy, and can send it your way via email...or grab it from the link in your other thread.

Oh, and hang o. For few minutes. Just like a Windows computer, there are a half-dozen ways to accomplish the same thing. Five more answers will land before midnight (chuckle).
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Post  dckrsn on Mon Feb 17, 2020 3:31 pm

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Post  OhBee on Mon Feb 17, 2020 3:45 pm

Thickness is kinda critical from what I can see. .....how thick ? Was the original an o ring or some kind of gasket material?
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Post  andrew on Mon Feb 17, 2020 4:47 pm

I have used dart O-rings before, but was not completely pleased with the fit. I ordered a couple of sizes from McMaster-Carr that fit better, but I'm not at home and do not remember the ID/OD that I use. If I can remember, I'll check when I get back.
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Post  Levent Suberk on Mon Feb 17, 2020 9:12 pm

Cox venturi gaskets looks like neoprene:

https://coxengines.ca/cox-.049-neoprene-fuel-tank-line-10.html

Some common types of O-ring materials including Nitrile, Neoprene, EPDM Rubber, Viton and Silicone. You can flatten an o-ring on a fine sandpaper.
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Post  Mark Boesen on Mon Feb 17, 2020 11:12 pm

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Post  OhBee on Mon Mar 09, 2020 8:24 pm

I finally gathered what I needed to cut venturi gaskets out of silicone fuel tubing,but it took several attempts to finally get a good one . Then I determined it was just too thick....quite a gap before tightening screws...so I made a thinner one...still a gap to squeeze shut. Last one was maybe 1/16 " thick. How much gap and squeeze/compression against this tubing gasket is tolerable? Was tougher than the pics and instructions made it look. Bad eyes,unsteady hands don't help.... doubt i can make one thinner than the last one. Everything looks bigger in forum pics!
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Post  944_Jim on Mon Mar 09, 2020 8:29 pm

Time for a bench-mounted magnifyng glass. Laughing
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Post  OhBee on Mon Mar 09, 2020 8:34 pm

Jim....got one for when I tied tiny trout flys....its packed away somewhere like most of what I own.  We are between homes at the moment so conditions aren't the best. But I have to do SOMETHING to keep from going nuts!.....so about the "squish" factor? ...  Preparing motor for Satan follies!
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Post  getback on Tue Mar 10, 2020 5:36 am

As long as there is a little resistance to the fit so it is sealing Small Cox Logo Babe Bee .049 Small Cox Logo
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Post  roddie on Wed Mar 11, 2020 7:00 pm

Wow.. I wish I'd seen this thread weeks ago. I've made gaskets out of kitchen-gloves. Do you remember the slogan; "so flexible.. you can pick up a dime..."? They were "Playtex" Kitchen gloves.. and Walmart still sells them.

BabeBee venturi gasket Kitche10

I've made tank-back venturi gaskets for Cox reed-valve engines.. ie: Babe Bee, Golden Bee etc.

Obtain a plier-type standard hole-punch (1/4" dia.) Punch-out some areas high on the cuff.. to retain the integrity of the glove.

BabeBee venturi gasket Kitche11

Collect the cut-outs and punch their centers .125" (1/8"). Pick the "nicest one" (closest to center..) and install it on the intake-side of the venturi-tube.

BabeBee venturi gasket Gap_ex12
BabeBee venturi gasket Gap_ex11

The material is spongy. When you mate-up the backplate to the tank-bowl (with its fuel pick-up positioned where you want it.. ) there will be a "slight gap" between the two.. (see below)

BabeBee venturi gasket Gap_ex13

When compressed, the gap closes and the seal is made.

BabeBee venturi gasket Gap_ex14






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Post  NEW222 on Wed Mar 11, 2020 7:59 pm

Thanks roddie. I was just going to dig up the thread and mention you adventures of making those gaskets. Just one of the small things that has stayed in my mind since you posted it.
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Post  OhBee on Wed Mar 11, 2020 10:15 pm

Well mine from tubing turned out thicker than that...gap is bigger.But I guess it will work ok. Not good at small precision surgery anymore!
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Post  NEW222 on Wed Mar 11, 2020 10:43 pm

Should work just fine. I have made them a bit thicker like yours and the engine still ran.
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Post  RknRusty on Wed Mar 11, 2020 11:13 pm

You could try something similar to the short black fuel tube like the PT19 fuel line. If it's the right ID and OD, chuck it in your drill press onto an inverted bit, ~.078" (or thereabouts), and spin it up slicing it with a razor till you get the best thickness. Those gloves Roddie uses look good too. The OEM gasket is flat, not toroidal like o-rings are.
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Last edited by RknRusty on Wed Mar 11, 2020 11:18 pm; edited 1 time in total

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Post  OhBee on Wed Mar 11, 2020 11:16 pm

Ya...i was certain it would work fine,just needed a bit more squeeze to button it up. Dissassembled it again today and everything appears  copacetic......Wink  chucking it all in a drill sounds like a great idea! I used the old bamboo skewer technique which takes a steady hand and sharp eyes.
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Post  dckrsn on Thu Mar 12, 2020 4:56 pm

RknRusty wrote:You could try something similar to the short black fuel tube like the PT19 fuel line. If it's the right ID and OD, chuck it in your drill press onto an inverted bit, ~.078" (or thereabouts), and spin it up slicing it with a razor till you get the best thickness. Those gloves Roddie uses look good too. The OEM gasket is flat, not toroidal like o-rings are.
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Nice language from a moderator! Toroidal!! UGH!
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Post  Cribbs74 on Thu Mar 12, 2020 5:32 pm

Dart o-rings! As mentioned several times already, no need to re-invent the wheel.

Throwing darts, as seen in pubs...

They work better than anything and are reuseable. They come in packs of 100 and are very cheap.
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Post  roddie on Thu Mar 12, 2020 5:59 pm

Beware that the vintage Cox pot-metal (Mazac/Zamac?) tank-backplate is fragile. If a venturi gasket is too thick.. or tough to compress, it could pose undue stress on the backplate prior to its sealing around the tank-bowl. The tank could leak. The backplate could fracture where the screw-heads seat.

Just something to be conscious of..
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Post  OhBee on Thu Mar 12, 2020 7:56 pm

Wasn't THAT hard to push the gap together!... Mine is less than 1/16 " thick. I'm not driving 60 mi round trip to look for something that probably is unfindable around here when I can make something from materials on hand with a bit of scrounging. My backplate appears to be brass also...not potmetal.
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Post  Oldenginerod on Thu Mar 12, 2020 8:37 pm

OhBee wrote:My backplate appears to be brass also...not potmetal.
None were ever brass. They're just plated with a gold-coloured coating. Earliest Babe Bee backplates were silver colour. Probably zinc plated.
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Post  NEW222 on Thu Mar 12, 2020 9:43 pm

roddie wrote:Beware that the vintage Cox pot-metal (Mazac/Zamac?) tank-backplate is fragile. If a venturi gasket is too thick.. or tough to compress, it could pose undue stress on the backplate prior to its sealing around the tank-bowl. The tank could leak. The backplate could fracture where the screw-heads seat.

Just something to be conscious of..

Uh oh roddie. Wish I knew that before.... I had to compress a couple of mine pretty decent. I guess I will have to take them apart and see which had teh thick gaskets. Or would one think now that they're compressed they will be fine.
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Post  RknRusty on Thu Mar 12, 2020 11:08 pm

If Ron says the dart o-rings work, then i'm inclined to believe it.

dckrsn wrote:Nice language from a moderator! Toroidal!! UGH!
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What, Bob? Are moderators supposed to use simpler syntax so as to appeal to the masses? Lol. You know I've always been a bit anal about the use of our language, and we have lots of self-taught engineers around here.. I coulda said "Donut-Shaped." But that might have made me hungry...Mmmmm, Dooonuuts... Doh, Gotta go now!

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Post  crankbndr on Fri Mar 13, 2020 5:07 pm

The dart o rings I tried were too fat, like in the doughnut (toroidal) kind of way. Mine must have been too toroidal as a matter of fact. I tried to split the toroidal lengthways, no dice.
If I can cut silicone tube paper thin that works for me, even if a little irregular. I certainly would not force the backplate in any way. YMMV


PS thanks for the new word Rusto Man
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