Author Topic: improving Grubb screw type vents  (Read 193 times)

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Online srcarr52

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Re: improving Grubb screw type vents
« Reply #10 on: October 29, 2015, 01:59:04 pm »
I think it's on this site that someone noticed it's the same as a Holley/Edelbrock/Carter/Motorcraft part. Made me blow the dust off my Holley track box in search of one for an 066, sure enough I had 3 in the box, I probably have another handful in the Holley box in our race trailer.

The marking is probably just a die number, same factory... different injection molding die.

Yes, they suck to get pulled through; but like many things, a little lube goes a long way.

Offline aclarke

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Re: improving Grubb screw type vents
« Reply #11 on: October 29, 2015, 03:20:05 pm »
I bought some a month or so ago for Carter/Edelbrock and posted about them on another thread.  Theyre identical specs as far as I measured. They tear as easy as the as the Stihl part too!! Lol

Offline 660magnum

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Re: improving Grubb screw type vents
« Reply #12 on: October 29, 2015, 07:30:59 pm »
[img http:///img]

Trying to figure out a no leak tank vent to retrofit the older grub screw type on older saws. Found a R/C valve that works for a while then the gas eats the flapper material.  Anyone know of a similar sized check valve that's gas proof??




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Offline Cut4fun .

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Re: improving Grubb screw type vents
« Reply #13 on: October 29, 2015, 08:04:13 pm »
[img http:///img]

Trying to figure out a no leak tank vent to retrofit the older grub screw type on older saws. Found a R/C valve that works for a while then the gas eats the flapper material.  Anyone know of a similar sized check valve that's gas proof??




http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXG869&P=7

Nice find Jim

NOTES FROM OUR TECH DEPARTMENT
This Gasoline Check Valve by Formost is Designed for use between the Fuel
Pump and Muffler. It helps to Prevent Back Flow From Muffler Pressure and
Keep the Residual Glow Fuel and Oil from Flowing Back Into the Pump.

INCLUDES

One Check Valve (blue and white)

SPECIFICATIONS

Size: 1/16" Inside Diameter: 1.6mm

FEATURES

The check valve may be used in any application that requires a
one-way valve.
Made from fuel proof nylon.
May be used with GAS, KEROSENE, SMOKE OIL, DIESEL, and GLOW fuel.
May be used in smoke systems and fuel systems requiring the
maintenance of tank pressure.
Direction of flow is to the BLUE END.
Has a stainless steel ball bearing sealing member that makes an
adequate (but not extremely tight) seal.



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Offline Cut4fun .

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Re: improving Grubb screw type vents
« Reply #14 on: October 29, 2015, 08:07:12 pm »
I think it's on this site that someone noticed it's the same as a Holley/Edelbrock/Carter/Motorcraft part. Made me blow the dust off my Holley track box in search of one for an 066, sure enough I had 3 in the box, I probably have another handful in the Holley box in our race trailer.

The marking is probably just a die number, same factory... different injection molding die.

Yes, they suck to get pulled through; but like many things, a little lube goes a long way.
I bought some a month or so ago for Carter/Edelbrock and posted about them on another thread.  Theyre identical specs as far as I measured. They tear as easy as the as the Stihl part too!! Lol

Thread in stihl board http://chainsawrepair.createaforum.com/stihl/stihl-tank-vent-check-valve/
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Offline 3000 FPS

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Re: improving Grubb screw type vents
« Reply #15 on: October 29, 2015, 09:50:57 pm »
Excellent Jim I did not know such a thing existed that small.   Sounds like it will work well on a chain saw.

I wonder how it would do on the Poulan micro series saws with the long fuel lines.   It might help keep the fuel in the line.
PP 505, 475, 445.

Offline aclarke

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Re: improving Grubb screw type vents
« Reply #16 on: October 29, 2015, 11:23:31 pm »
Jim, thanks.  Looked online for a long time and missed those.  Sullivan makes a nice check valve but couldn't find any data on fuel compatibility. Echo, shindaiwa look good too...

Offline 660magnum

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Re: improving Grubb screw type vents
« Reply #17 on: October 30, 2015, 08:26:24 am »
The Sullivan one is intended for "smoke" oil. It is kerosene and petroleum oil compatible. It has an aluminum case.

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