Eric the 5/16" lines are not your problem. The pick up point may be. Go to
your step 1 and give the N2O system a separate fuel supply system to the
bikes. Start at 5psi with solenoid open. You shouldn't need more than that.
Depending on the type of fuel pump you are using for the nitrous you should
mount it closer to the fuel tank if it is a push pump like a typical
electric pump in performance car applications. These pumps like reticulation
feed from the tank (pump below tank) and then to push the fuel to its
source(solenoid), rather than pull it from the tank, through a "t" and so
on.
You will have the cleanest fullest fuel head by doing it this way. Even if
you are slightly rich or slightly lean you should not experience the effect
you are getting with the fuel supply set up to deliver a full head of fuel
without any chance of air pockets or interrupted erratic flow which I
believe you may be experiencing.
You don't need to be real close to the solenoid(fuel pump location) you need
to get the fuel pump to have a full load of fuel to work with and then it
will easily keep the line to your solenoid full and at whatever pressure you
dial in.
You also realise the G forces are strongest in low gear so a problem like
this will be most obvious at first hit.
Good luck
Sam
Eric Harnish wrote:
> I do not know if I'm chasing a ghost or what ? My problem is my fuel
> pressure.On the initial hit the pressure will drop to 3 psi and the
> engine will stutter do to the low pressure switch and what I think is
> also a lean condition . After the initial hit while going through the
> gears all is well . The pressure is 7psi with the solenoid closed drops
> to 5.5 psi
> open . This is the second pump . I'm using 5/16 fuel lines .
> I'm tapped in before the bikes fuel pump . On the pressure side of the
> pump the fuel passes throuh a NOS low pressure switch and a Ford type
> fuel filter then to the solenoid . The solenoids are mounted to #'s 1&3
> carbs. The pump now is located on the frame between the tabs for the
> center stand just below the swingarm . I'm down to a 16/20 jet combo .
> By the way when I was checking the flow with the nozzles out one was not
> up to par . After some work I found out the jet was a little smaller
> than the rest .
> Thomas Powell was gracious enough to run his bike & give me his
> numbers . We match very closly except after the first hit .
> I think that the fuel starvation problem is maybe the pump head is too
> much or the feed side is too restrictive for the position of the pump .
> I'm thinking of step 1 drill out the drain plug boss in the tank & tap
> to a 1/4 npt & install a 3/8 fitting & feed the pump with a 3/8 line .
> Step 2 If step 1 dosen't work get the pump up in the frame closer to the
> solenoid . Step 3 Build a loop system and regulate the pressure .
> Sam & the rest of you guys what do you think ? Am I being too anal
> here ? Should I just adjust the pressure switch down to 3psi & run it or
> keep chasing the problem ?
> Eric H.
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