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Old 11-05-10, 05:27PM   #46
region warrior
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Quote:
Originally Posted by TIN TIGR View Post
a 15% increase in fuel volume wont cut it..unless his carb is stooooopid fat..
My thought too.
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Old 11-05-10, 10:01PM   #47
Mighty T/A
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Quote:
Originally Posted by Stan Weiss View Post
Find area of each jet
► n1 = (.028 / 2)^2 * pi
► n2 = (.024 / 2)^2 * pi
► n3 = (.042 / 2)^2 * pi
► n4 = (.038 / 2)^2 * pi

Area of each jet in sq. in.
► vars
Variable Name Variable Value
n1 = 0.0006157521601035995
n2 = 0.0004523893421169302
n3 = 0.001385442360233099
n4 = 0.001134114947945915

ratio of the areas
► n2 / n1 = 0.7346938775510202
► n4 / n3 = 0.8185941043083899

in case two you can see about an increase 8% in the difference of the ratios

use the ratio of the first group to find the needed jet size
► n3 * n2 / n1 = 0.001017876019763093 sq. in. which is a 0.036" diameter jet

New Jet will have same ratio
► n6 = (.036 / 2)^2 * pi
► n6 / n3 = 0.7346938775510202




My web site - main page - has a number of calculators
http://users.erols.com/srweiss/index.html
My software
http://users.erols.com/srweiss/winscren.html
Cylinder Heads Flow Data at 28" H2O.
http://users.erols.com/srweiss/tablehdc.htm
Electronic Fuel Injector (EFI) Flow Data Table.
http://users.erols.com/srweiss/tableifc.htm

Stan
Dude, that is awesome information. The way I read it a 28 to 24 is 36% different, 42 to 38 is 22% different.

So I am really good at math on balance sheets but slept through algebra (swapped my spanish and science homework for the hot chick who sat in front of me's math LOL...) can you please write the formula? I don't know what ^ or * is telling me to do??? I need nitrous math for dummies
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Old 11-05-10, 11:04PM   #48
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Ooooo! I can help with that. (I majored in math --- a bazillion years ago --- before they finished inventing all the numbers...)
* means multiply, as in 2 * 2 = 4 ........ 3 * 2 = 6 and so on.
^ stands for exponentiation, or "to the power of", as in 2 ^ 2 (2 squared) = 4 ......... 2 ^3 (2 cubed) = 8 ......... 2 ^ 4 (2 to the 4th power) = 16

Taking one of his examples..
n1 = (.028 / 2)^2 * pi

What's going on there is you're calculating the area of a hole that's .028 in diameter. The formula for the area of a circle is the radius (which is half the diameter - .028/2 in this case) "squared" ( to the 2nd power, or ^2) times the value of pi (3.1415926535....).

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Old 11-06-10, 01:21AM   #49
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Quote:
Originally Posted by BearGFR View Post
Ooooo! I can help with that. (I majored in math --- a bazillion years ago --- before they finished inventing all the numbers...)
* means multiply, as in 2 * 2 = 4 ........ 3 * 2 = 6 and so on.
^ stands for exponentiation, or "to the power of", as in 2 ^ 2 (2 squared) = 4 ......... 2 ^3 (2 cubed) = 8 ......... 2 ^ 4 (2 to the 4th power) = 16

Taking one of his examples..
n1 = (.028 / 2)^2 * pi

What's going on there is you're calculating the area of a hole that's .028 in diameter. The formula for the area of a circle is the radius (which is half the diameter - .028/2 in this case) "squared" ( to the 2nd power, or ^2) times the value of pi (3.1415926535....).

Bear
Got it!! Thanks for helping my brain process.... i think Stan skipped MIT for something a little tougher.
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Old 11-06-10, 01:49AM   #50
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Thanks BearGFR for the explanation.

n1 = nitrous 1 jet diameter
f1 = fuel 1 jet diameter

n2 = nitrous 2 jet diameter

f2 = fuel 2 jet area


► f2 = ((n2 / 2)^2 * pi) * (((f1 / 2)^2 * pi) / ((n1 / 2)^2 * pi))
0.001017876019763093
► Variable Name Variable Value
n1 = 0.028
n2 = 0.042
f1 = 0.024
f2 = 0.001017876019763093


Stan
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Old 11-06-10, 02:54AM   #51
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Here is a windows program that should do the math for you.

http://www.magneticlynx.com/carfor/nitr_jet.exe

Let me know if you have any problems.

This is free for anyone to use.


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Old 11-06-10, 03:41PM   #52
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Quote:
Originally Posted by Stan Weiss View Post
Here is a windows program that should do the math for you.

http://www.magneticlynx.com/carfor/nitr_jet.exe

Let me know if you have any problems.

This is free for anyone to use.


Stan
Stan, you are a genius!
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Old 11-07-10, 01:18AM   #53
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I post about the program on another forum. I was ask the question below.

Are you asking about:
Take a fogger nozzle with a 28N and 24F using 950 psi and 6 psi accordingly and the air fuel ratios come out nicely. Take the same nozzle with a 28N and 55 psi fuel pressure and what would you need for a fuel jet?

OK version 2 is up and will do this.

Stan
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Old 11-07-10, 02:33PM   #54
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cold fusions web site has a nice jet calc dolly..its safe, but entirely workable..i use it for rookies..get them started..

then when they get use to it, we start tuning..
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Old 11-07-10, 11:45PM   #55
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When flowing a system you weigh the fuel but how do you know how to figure the nitrious jet?
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Old 11-08-10, 12:30AM   #56
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i do the same thing..i have a very accurate scale, and weigh the bottle..most of nitrous tuning becomes "cookbook" after a while...the real issue is the decades of bullshit you have been fed on what is correct N/F ratios, and the chemistry of combustion..when we railed against NOS in the early years, we were called heretics..blasphemers..and the idiots at car mags like hot rod, or car craft, didnt help..

but i digress, ya dont need a history lesson..

just weigh bottle before, and after..then you know the flow..make sure you record pressure, original bottle weight..and be aware that flow changes with bottle volume..

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Old 05-09-17, 10:56PM   #57
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Whatever happend to Robin?
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Old 06-09-17, 10:52PM   #58
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I think all the cv1 guys became extinct!
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Old 06-10-17, 01:50AM   #59
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After his third set of CV-1's I think he would've given up. Maybe not, saw pictures of a all knew tube chassis Firebird. Auh what the hell they were free.
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