| Kawi2strokes.com Forum http://www.kawi2strokes.com/forum/ |
|
| H1 petcock - how much can it deliver ? http://www.kawi2strokes.com/forum/viewtopic.php?f=14&t=12436 |
Page 2 of 4 |
| Author: | falconman [ Fri Jan 27, 2017 8:06 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
Jim wrote: Did you try a stock petcock with the big float valves, Jim? In a word, yes and no. It was a stock petcock, for an '86 600 Ninja. At higher elevation (Bonneville is usually around DA 7800 during Speed Week) you have less pressure acting on the fuel in the tank so extreme action must be taken to make a gravity feed system flow enough. I will be setting up future bikes with an electric pump due to the flow problems I had. |
|
| Author: | Jim [ Fri Jan 27, 2017 8:17 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
Interesting, thanks for the explanation. |
|
| Author: | 900SL [ Sat Jan 28, 2017 7:42 am ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
Ja-Moo wrote: 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.  Great - sounds like an easy way to get piece of mind Thanks  u
|
|
| Author: | Neville Lush [ Mon Feb 06, 2017 9:55 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
Do a fuel test. Place the three lines into a jug and measure how much flow there is in one minute. Repeat test with fuel cap open. Often the vent gets partially blocked. When I was younger my H1-B would run the bowls dry after about 3 miles WOT. I found the vent /cap gasket had swollen due to water ingress blocking part of the air inlet. After fixing that I could run for pretty much as long as I wanted. Bike was completely stock however. |
|
| Author: | Jim [ Mon Feb 06, 2017 10:33 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
That's some good advice, Nev. I had my H2's gas cap labyrinth vent clog from swollen gaskets myself. And if you're not used to how it goes together, it can be pretty confusing. |
|
| Author: | R.B. [ Tue Feb 07, 2017 8:38 am ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
One thing that actually puzzles me is a Z1 fuel tap, the hole in the rubber inside the tap that allows the fuel to flow is about the diameter of a matchstick! This aperture allows enough fuel to pass to feed FOUR carburettors at 130 MPH! 
|
|
| Author: | Zambia [ Tue Feb 07, 2017 8:59 am ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
R.B. wrote: One thing that actually puzzles me is a Z1 fuel tap, the hole in the rubber inside the tap that allows the fuel to flow is about the diameter of a matchstick! This aperture allows enough fuel to pass to feed FOUR carburettors at 130 MPH! I guess a matchstick would have greater diameter than the combined total of 4 main jets, right? The volume of fuel that can flow through the main jet is what really matters...and it's probably less than we think even considering intake vacuum. |
|
| Author: | Neville Lush [ Tue Feb 07, 2017 5:52 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
4 carbs for sure but only pulling fuel every second lap of the engine. A Zed uses half the fuel of an H2. Do not forget that the size of the jet is not everything, the engine pulls fuel out of that hole, more than just what would run thru the hole with gravity. |
|
| Author: | Walms [ Tue Feb 07, 2017 7:02 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
my tank drained from full in about 1 minute but I'm using a 3/8" ball valve for a petcock. Just do the test with the fuel cap on and compare flow at the beginning and end. I doubt any triple can consume that amount. Rounding some numbers 100 mph @ 10 mpg with a 3 gallon tank, it would take 18 minutes to consume that gas. Maybe not the perfect equation but it kind of put things into perspective. |
|
| Author: | Neville Lush [ Tue Feb 07, 2017 7:34 pm ] |
| Post subject: | Re: H1 petcock - how much can it deliver ? |
Wow  that IS a good tap.
|
|
| Page 2 of 4 | All times are UTC - 5 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|