Tech

COMPARISON: -6AN VS -8AN Feedlines

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.

10160-(9)

The only thing we will change when swapping to an 8AN feed line is the Y and the feed line. To get a definite answer we conducted an apples-to-apples flow comparison on the intake above. Changing ONLY the feedline from -6AN to -8AN we flowed several jets at 850psi and recorded our data. As we expected on smaller jets (.036 and smaller) the -6AN feedline flowed more than the -8AN line did, but with jet sizes larger than .040 the larger -8AN hose proved beneficial.

-6AN Feedline 
.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
-8AN Feedline
.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

Just in case your not sitting right next to a -6AN and -8AN here is handy eye test to give you an idea in the size difference:

FeedlineSidebySide (1) FeedlineSidebySide (2)

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