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This is some info that Dave gathered regarding the flowing pph levels of one of our foggers hooked up with an 8AN Feed Line Vs. a -6AN Feed Line. Check it out!
-6 AN VS -8 AN
When does a bigger main feed line help flow vs hurt flow? You may be surprise to discover bigger is not always better. I have racers always calling me wanting a 8 AN feed line on smaller tune up applications because they were told it would increase flow. So today I am going to provide you with a comparison flow data of -6 AN VS -8 AN.
The direct port intake that we are using for comparison flow data has .122 Nitrous solenoids and .187 fuel solenoids feeding SBT nozzles.
The only thing we will change when swapping to an 8AN feed line is the Y and the feed line.
The System was flowed at 850 psi
You decide if its helping or hurting flow.
-6 AN
.026 Jet = 792 PPH 30 PSI Drop
.036 Jet = 1360.8 PPH 59 PSI Drop
.041 Jet = 1706.4 PPH 58 PSI Drop
.057 Jet = 2642.4 PPH 93 PSI Drop
-8 AN
.026 Jet = 691.2 PPH 36 PSI Drop
.036 Jet = 1245.6 PPH 51 PSI Drop
.041 Jet = 1778.4 PPH 74 PSI Drop
.057 Jet = 2692.8 PPH 103 PSI Drop
Whats the volume difference between a 14' 6AN & 8AN feedline? Moving from dual 4s to dual 6s made me really notice how much nitrous is left in the feedline and being wasted on bottle changes. ..another factor to consider.
That's a good point. Typically guys who NEED -8an feed lines are running them much shorter than 14', so it's hard to say on the difference, but I think it could be a good amount at that length.
Whats the volume difference between a 14' 6AN & 8AN feedline? Moving from dual 4s to dual 6s made me really notice how much nitrous is left in the feedline and being wasted on bottle changes. ..another factor to consider.
Our 8an measures out to .355 before it is crimped and the 6an measures out to .275 before it is crimped just to give you an idea of the size difference.
The lenth of the hose and fitting arrangements will alter how much the hose can flow. Most nitrous systems come standard with a 14 to 16 ft hose. I have found that the 4an hose that long starts suffering around 225 to 250 horse power. Switching to a 6an at that point will improve the flow rate of the system.
like to see a test done with 4an and 6an. im at the point some ppl say a 4an is hurting me and some say i got 50 hp to go before i need a 6an. i think what hurts some of these kits is going to a 3an after the noid. my kit is a nx plate and noids with a 4an line from start to finish all straight lines no angles and 12' long. been told i need a 6an to flow 200-225 and some say im fine till 250 maybe more.. i got a bet going to see if the 4an will support 200 on a dyno pull. will know in a few more weeks
pph? dP? What do these mean? Also, could adapter fittings (reducers and such) have affected the numbers in a negative manner?
PPH is pounds per hour. This is how we measure flow rates. We use a 3.6:1 ratio when calculating hoursepower from the amount of nitrous flowed. 3.6pph=1hp essentially.
There were no adapter or reducer fittings used in this test. The only thing changed was the Y fitting, feed line and bottle nut. It was changed from a 6anX6anX6an Y to an 8anX6anX6an Y fitting. The bottle nut went from 6an to 8an.
What is the max HP you can flow thru a -6an line with a single bottle setup? At what point is the -8an mandatory? I doubt I'll ever spray enough to need it but I'm curious. I have a friend hitting his LS1 400 shot on a plate, I believe its only a -6an line.
What is the max HP you can flow thru a -6an line with a single bottle setup? At what point is the -8an mandatory? I doubt I'll ever spray enough to need it but I'm curious. I have a friend hitting his LS1 400 shot on a plate, I believe its only a -6an line.
Loaded question kinda... Would depend on the length of line. Big Block nitrous combos in classes like X275 (4.50s from 588" max single fogger) are required to run -6 main feed lines... Lots of creative ways to get the flow though.
I actually saw different results with my car... We had to change to -6 for Ultra Street. I log nitrous pressure at the bottle and after the solenoid... -6 to -8 caused the pressure drop to go up almost 70psi. Also all my tunes(78 jets and higher) were fat....
Well if you guys get bored you can flow test a Singer Plate with a -4 vs -6 and let me know how much I'm losing with a 99 jet.
I'm restricted to a -4 feed. I have 4' line to a 1/4 turn valve then another 4' line to solenoid and -4 lines from solenoid to plate is what Lance and Dave came up with. I'd like to know if there's more on the table for the days I'm not "Class" racing
Well if you guys get bored you can flow test a Singer Plate with a -4 vs -6 and let me know how much I'm losing with a 99 jet.
I'm restricted to a -4 feed. I have 4' line to a 1/4 turn valve then another 4' line to solenoid and -4 lines from solenoid to plate is what Lance and Dave came up with. I'd like to know if there's more on the table for the days I'm not "Class" racing
Are you restricted to a -4an feed line entirely or do your rules require a 1 ft section of 4an? That confuses a lot of people. Have you ever done a flow consumption test to get a roundabout idea of how much nitrous you are moving?
Are you restricted to a -4an feed line entirely or do your rules require a 1 ft section of 4an? That confuses a lot of people. Have you ever done a flow consumption test to get a roundabout idea of how much nitrous you are moving?
Our complete feed has to be -4. I've never tested anything lol, just started using the stinger recently
This is some info that Dave gathered regarding the flowing pph levels of one of our foggers hooked up with an 8AN Feed Line Vs. a -6AN Feed Line. Check it out!
-6 AN VS -8 AN
When does a bigger main feed line help flow vs hurt flow? You may be surprise to discover bigger is not always better. I have racers always calling me wanting a 8 AN feed line on smaller tune up applications because they were told it would increase flow. So today I am going to provide you with a comparison flow data of -6 AN VS -8 AN.
The direct port intake that we are using for comparison flow data has .122 Nitrous solenoids and .187 fuel solenoids feeding SBT nozzles.
The only thing we will change when swapping to an 8AN feed line is the Y and the feed line.
The System was flowed at 850 psi
You decide if its helping or hurting flow.
-6 AN
.026 Jet = 792 PPH 30 PSI Drop
.036 Jet = 1360.8 PPH 59 PSI Drop
.041 Jet = 1706.4 PPH 58 PSI Drop
.057 Jet = 2642.4 PPH 93 PSI Drop
-8 AN
.026 Jet = 691.2 PPH 36 PSI Drop
.036 Jet = 1245.6 PPH 51 PSI Drop
.041 Jet = 1778.4 PPH 74 PSI Drop
.057 Jet = 2692.8 PPH 103 PSI Drop
Looking at the results for the -6 line, I see what appears to be a glitch
in the data.
The .036 test flows 1360.8 PPH with a 59 PSI drop.
The .041 test flows 1706.4 PPH with a 58 PSI drop.
If the starting bottle parameters for both tests are equal (volume/weight
and pressure/temp) I find it difficult to understand how the results
show a 25% (346/1360.8) flow increase while bottle shows
a decrease in pressure drop. (59 vs 58)
What's your thoughts?
Last edited by magnum-gto; Jun 6, 2015 at 08:12 AM.
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Contemplating an -8AN feed line? Read this first! 
