flow jet size

[Cs19]

how do i determine a flow jet size? Isnt there a formula to get the jet size?

[Monty Mikho]

If you are using a fogger.. Always use a .068 - .080 jet.. Personally I used a .073 jet.. Why? I have no idea.. It's what I had.. Keep that jet in your flow tool.. Dont just use any jet after that.. This one jet will become your master.. Not all jets are created equal..

[FLYIN4D]

Monty,

Were you using a Holley carb .073 jet or were you using a .073 Nitrous Flare jet? Some guys get confused.

Wes

[Monty Mikho]

Its a nitrous pill that checked .073 with a pin gage..

[Cs19]

Wow, thats interesting. I thought I remember having to run a specific flow jet size based on what jetting you had in the fogger.

[Monty Mikho]

Wow, thats interesting. I thought I remember having to run a specific flow jet size based on what jetting you had in the fogger.

Not all jets are created equal.. Meaning sometimes a .068 will out flow a .072 jet.. So keeping the same jet in keeps this from happening.

[Cs19]

I understand what your saying.. Ill tune off the .073 jet.

I was going to disconnect each fuel feed line at the solenoid and install a flow jet in each line and take my pressure reading at the fuel pressure regulator.. So should I run a .073 in each side when I flow it to set the pressure? Or do I divide that .073 by 2 and run a .037 in each side?

Thanks.

[superdave]

if you run a nos fogger with a square jet set-up...i.e. 36F-36N...you are correct there is a formula to calculate the flow tool size....which all you are doing is flowing it with the total square area of all the fuel pill openings thru one holley jet-
(it does work)

if you run a staggered setup in the fogger...i.e. 36n/32f...i used a holley #70 jet
and based the tune-up on that jet....i think any jet in the 70 range will due the same thing but u need to stay consistent with that jet while checking your plugs and dropping fuel pressure--

[Cs19]

I need to order some parts to do this..

I was kicking around 2 different methods of setting the fuel pressure.

1st method was getting that digital guage from Koeheler and taking my reading from the 1/8 pipe port on my 2 port regulator. i was going to make my own jet holding tools out of some -3 fittings and braided line, I planned on installing a jet into each fuel line when I flow the system. Here is the guage i was interested in below.

http://www.koehlerinjection.com/Koehler/OpenFTkit/open_kit001016.jpg

Next method would be to simply buy 2 flow jet tools from either wilson or barry grant and install one on each fuel line.Here is their tool..

http://wilsonmanifolds.com/shop/contents/media/t_904001.jpg



what do you think? both will cost about the same but Id rather do the Koehler guage deal if its an accurate way of doing this.

[superdave]

check out www.sonnysracing.com

he's got one for 129- for the whole rig....looks like a nice piece...
it looks complete ready to use...

mine is similar but i use a 4" liquid filled ASHCROFT industrial guage...they say the bigger the gauge the more accurate the reading....
i've seen some pro mod people with 6" dia. guages...

[n2oracer]

You only need to unhook one fuel line from the regulator and attach the flow tool to that. Hooking up to both lines is not neccesary.

[Cs19]

I ended up getting one from nitrous supply for about 125 with some jets included.

Here is a pic of how im setting the fuel pressure.
Do you guys reccomend setting it with the engine running ( im running an alternator) or just do it with the engine off with a fully charged battery?

Cs19


http://www.hotboatpics.com/pics/data/500/613DSC00756-med.JPG

[Monty Mikho]

That seems to be fine. But I would recommend a holley blue regulator for your nitrous. Also one fuel line off the regulator to the flow gage is enough to flow it. You can (i have always) done it with a fully charged battery with the motor off. Also do not solid mount your regulators off the motor. Let them hang off the hoses.. Your regulators will love you for it..

[Cs19]

Yes I heard the holley regulators work good for nitrous..Any idea why? Also, will these work for larger nitrous shots ?

Im pretty sure this is the regulator that I need, just want to double check...Max pressure regulator in the link below?

http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?langId=-1&storeId=10001&catalogId=10002&categoryId=14167&searchItemId=18327

thanks.