Author Topic: Fuel vent rollover valve for streamliner bike advice please  (Read 7883 times)

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Offline Jon

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Fuel vent rollover valve for streamliner bike advice please
« on: January 12, 2012, 06:52:55 AM »
Hi

Can anyone recommend a Fuel vent rollover valve that will work at 90 degrees.

I'm putting together a streamliner bike & the valve I've bought doesn't close off reliably until it is about 135 degrees, I don't want end up with the bike on it's side leaking fuel.



Thanks
Jon
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Offline Stainless1

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #1 on: January 12, 2012, 10:13:31 AM »
Jon, you should have a tube on your rollover, put an S in it on the way to the bottom of the tank, make the s the same width as the tank.  That way your rollover will not leak gas regardless of position.
Stainless
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Offline SPARKY

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #2 on: January 12, 2012, 12:34:13 PM »
Same thing with a vent tube that runs diagionaly from one corner to the opposite corner then past the bottom of the tank,  only 1 90 degree bend so that you do not create a   "P " trap -- make it fairly large, as large as your fuel line.
« Last Edit: January 12, 2012, 02:42:14 PM by SPARKY »
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Offline Jon

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #3 on: January 12, 2012, 01:41:58 PM »
Thanks for your help guys, I appreciate it.

Jon
Underhouse Engineering
Luck = Opportunity + Preparation^3

Offline SPARKY

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #4 on: January 12, 2012, 02:40:27 PM »
PS  I would put it on the rear corner for salt racing as your G loads will be much greater with the chute than it will with accelleration
Miss LIBERTY,  changing T.K.I.  to noise, dust, rust, BLUE HATS & hopefully not scrap!!

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller

We are going to explore the racing N words NITROUS & NITRO!

Offline oz

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #5 on: January 12, 2012, 03:12:00 PM »
Hi jon I got a one way vent from Earls performance plumbing it wasnt to dear but works perfect at what seems any angle
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Offline Jon

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #6 on: January 12, 2012, 03:16:55 PM »
Thanks Oz, does gassing out of fuel pressurize your tank mitch or does it bleed off pressure?

Thanks
Jon
Underhouse Engineering
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Offline oz

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #7 on: January 12, 2012, 03:29:38 PM »
It has a little ball bearing in it and as the fuel gets used lets a little air in cant push anything through the other way fuel air nothing goes back through I have tried and its a pretty little anodised thing with a NPT or BSP thread so dead easy to fit.
Newcastle born and bred a City built on Coal and Steel and a people built of stronger stuff

Offline maj

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #8 on: January 13, 2012, 04:37:46 PM »
I fitted something like that to my manufactured fuel tank on my bike this year and was not real happy with the potential shake or bump spillage or the action of the ball so put a light spring behind the ball

Offline jdincau

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #9 on: January 13, 2012, 05:52:31 PM »
The simplest is a hose that comes out of the top of the tank, down one side, accross the bottom, up the other side, accross the top and is tie wrapped to the fitting coming out of the tank. This isn't elegant but it works, requires nothing inside the tank, has no ball or spring to stick and vents in both directions without restriction. It also will spark no discussion in tech.
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Offline SPARKY

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #10 on: January 13, 2012, 05:59:03 PM »
Jim that can P trap, and block the venting --and has caused engs to lean and blow up... from one corner across diaogonally and down the corner,to below the bottom of the tank will work and will not P trap
Miss LIBERTY,  changing T.K.I.  to noise, dust, rust, BLUE HATS & hopefully not scrap!!

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller

We are going to explore the racing N words NITROUS & NITRO!

Offline jdincau

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #11 on: January 13, 2012, 07:47:46 PM »
P trap? Not familiar with the term.
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Offline Seldom Seen Slim

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #12 on: January 13, 2012, 08:13:13 PM »
Maybe not the term, but the item.  They're the bit of plumbing that keeps nasty smells from escaping the drains in your toilet and sinks.  Shaped kinda like a sideways letter "P" 8-)
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Offline saltwheels262

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #13 on: January 13, 2012, 08:22:26 PM »
every sink and toilet has a p trap.
some have s traps.

they hold a "block" of water at the lowest part of the plumbing ,
right below that fixture.

they prevent gasses, air, stink or what not from passing through
the next straight section of pipe, upward.

a liquid lock as opposed to a vapor lock. (?)

a liquid lock will cause a vapor lock.
correct?

franey
bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

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Offline saltwheels262

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Re: Fuel vent rollover valve for streamliner bike advice please
« Reply #14 on: January 13, 2012, 08:25:13 PM »
it took 10 minutes to post that, but conirms slims post.
bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

" it's not as easy as it looks. "
                            - franey  8/2007