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H1 petcock - how much can it deliver ?
http://www.kawi2strokes.com/forum/viewtopic.php?f=14&t=12436		 Page 1 of 4
Author:  900SL [ Fri Jan 27, 2017 3:05 pm ]
Post subject:  H1 petcock - how much can it deliver ?
For my H1 resto http://www.kawi2strokes.com/forum/viewtopic.php?f=13&t=11615 I wanna use the original petcock - at least for the moment ;)

Have any of you guys an idea of how much it can deliver ? ml or fluid oz/per minute. Any specs ?

I keep thinking of the following scenario:

Riding for longer periods in 5. gear at let's say 5-6.000 revs/minute, which with my 16/45 drive ratio probably equals 120-130 km/hour = normal speed at some highways, even here in Denmark. If petcock does'nt deliver enough, engine will starve a little. Burned pistons might be the ultimate consequence.
Not worried about short accelerations bursts up to let's say 7.5-8.000 rev/min, as the "buffer" in the carb bowls will secure adequate fuel supply for the few seconds it lasts (my assumption)

Please stop me if I go astray, but I seriously consider to make a test, including the rubber pipes and the 3 small filters I have incorporated.
If I achive, let's say 300 ml /minute performance from standard petcock this can be measured against how much fuel a 500 ccm running at 5-6.000 revs/minutes uses.

Overkill ?
Am I too cautious ?
Will my results differ depending on whether I connect the the vacuum pipe or not ?
Author:  mraxl [ Fri Jan 27, 2017 3:15 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
Think about how large the fuel valve orifice is compared to the petcock.... I don't think you have anything to worry about.
Author:  Ja-Moo [ Fri Jan 27, 2017 3:30 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
I'm actually using just 1 of the 3 feeds, opened to 1/4" line to run my 38's.
Author:  900SL [ Fri Jan 27, 2017 3:32 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
mraxl wrote:
Think about how large the fuel valve orifice is compared to the petcock.... I don't think you have anything to worry about.


Hmm.. you 've lost me :) You mean the float valve orifice? Or ?
Author:  mraxl [ Fri Jan 27, 2017 4:44 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
Quote:
Hmm.. you 've lost me :) You mean the float valve orifice? Or ?

Yes... float valve orifice.
Author:  900SL [ Fri Jan 27, 2017 5:37 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
Thanks guys.
And I guess that if Ja-Moo uses only 1 of the 3 feeds, to run 3 VM38's, I do't need to worry, as I'm going to use all 3 feeds

Goodnight :thumbup:
Author:  falconman [ Fri Jan 27, 2017 6:24 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
For my Bonneville H1 I had to go with the largest float valve and a 3/8ths outlet Pingle or my bowls would run out of gas by the 2 mile mark.
Author:  Jim [ Fri Jan 27, 2017 6:34 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
Did you try a stock petcock with the big float valves, Jim?
Author:  RODH2 [ Fri Jan 27, 2017 7:07 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
...is it relevant that the area of the petcock outlet is a whole lot more than the area of the 3 main jets? (I take mraxl's point about the float valves.) :think:
Author:  Ja-Moo [ Fri Jan 27, 2017 7:09 pm ]
Post subject:  Re: H1 petcock - how much can it deliver ?
If you actually want to do a test for piece of mind, You can take a main jet and see how much it flows in 30 seconds, and then your pilot. Then let one petcock line run through the fuel valve (bowl off basically) into a measuring jar and then just subtract the jet flows. :thumbup:
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