Nozzle pressure

[Joesmoke]

A couple of real easy questions for anyone but me!

I am trying to calculate flows for my mcmaster car nozzles. If I have a 100 psi pump servicing 2 nozzles, does that mean each nozzle is only recieving 50 psi?
Then, if I have 20 psi boost, do I split that between the nozzles as well, so each nozzle has an effective pressure of 40PSI?

Just a little lost on the basics.

Thanks

 

[salvageV6]

Normally the pressure doesn't drop in half with another nozzle added on but of course that depends upon the pump used.

Here's a link to some data via the search feature.

http://www.turbobuick.com/forums/showthread.php?threadid=90178&highlight=flow+test

 

[Joesmoke]

Thanks for that link. I did do a search, but guess I just didnt use the right terms! Ill read through that and see what I come up with.

Just trying to figure out how much the nozzles will actually flow with reduced pressure (multi nozzles)/pressure working against them, using the 100 psi shurflo.

Any other comments, references?

 

[Razor]

100 PSI=100PSI. Thats not 50 per nozzle.

Also doesnt take into account the style of pump and if its pulsating or not.

And the pressure within the intake tube to reduce the number as well. 20 PSI in the intake is 80 effective.

Lastly, even if you came up with 900cc per minute.. how do you know your motor needs 900cc per min? Not 1100 or 500? There are way too many variables in play as to the amount needed.

It does no good to have 8 nozzles with 150 PSI on them.. once you spray too much.. you sprayed too much.

You can get the job done running larger nozzles at 45 PSI, or smaller nozzles at 150 PSI. The motor will need to be subjected to some trial and error.

 

[Joesmoke]

Thanks! The answer I was looking for!

The reason I ask these questions is the reason I should get a PAC! I am trying to build the most linear system that I can using a limited number of DIY parts. (jets, switches etc...)

I am aiming for 15-25% alcohol (which is really the water injection calculations) to fuel for a starting place using a multistage system with turn on points of 4 psi and 15 psi, but I never thought about the pressure acting against the nozzles when calculating the jet size. Then I just wasnt sure if the initial pressure was split......

Btw-big thumbs up to the experts and pioneers that are on this board. You guys provide a wealth of information that is just awesome! I have pointed a number of people to this board who were looking into water/alcohol injection.

Thanks again.
Jason

 

[zerobanger]

Originally posted by Joesmoke
A couple of real easy questions for anyone but me!

I am trying to calculate flows for my mcmaster car nozzles. If I have a 100 psi pump servicing 2 nozzles, does that mean each nozzle is only recieving 50 psi?
Then, if I have 20 psi boost, do I split that between the nozzles as well, so each nozzle has an effective pressure of 40PSI?

Just a little lost on the basics.

Thanks

Joe,

your flow is limited only by your pump, nozzel size and number of nozzles. lets assume you have the 100 psi pump and that the nozzel's are rated each at 3 GPH. most of the pumps are rated for simplicity sake lets say you have the 1.0 GPM shurflo pump. Your nozzels are rated in gallons per hour, while your pump is rated in gallons per minute. This means for each nozzel you put in your car you are guaranteed to have full flow until the flow of all the nozzles is greater than the flow of the pump.

In otherwords, if you have 2 nozzels that each are rated at 2 GPH you will be spraying 4 GPH into your intake stream.

The only time PSI comes into play with the nozzels is determing GPH. make sure when you look at the GPH rating of the nozzel that you are comparing it to the same PSI that your pump is putting out. Otherwise you can convert it.