AN fitting size help needed

[Fullboogie]

I'm needing to get a new set of AN adapters for a fuel rail on my ski. The aftermarket rail (which is extremely nice) came with screw in fittings for the ends of the rails that have hose barbs - I need to change them to accept -6 hose ends (instead of hose barbs) for my existing fuel system.

I measured the threads on the fittings and they measure 0.865. There's a fitting that seems to match what I need in a -14 size (-14 straight cut with o-ring to -6 hose end, a really fucked up fitting size). But, -14 converts to .0875", which is 10 thou bigger than what I'm measuring on the fittings supplied with the fuel rail. Do these measurements jibe, and is -14 what I need? There's nothing else even close on the Summit site. Need to order by tomorrow morning, so input is appreciated.

PS - I know it's not Mustang chit chat, but I need a quick answer please. Thanks guys.

 

[Wes06]

Not mustang chit chat?
TEKKKK!!!!!
Lol jk good luck finding what you need

 

[TexasBlownV8]

If the fitting specs on the sire you are getting them from is the side you need, -14 is probably right. The o-ring end is critical anyways, so that needs to be proper at the rail, then it's a matter of adapting down to the -6 connections you need.

If the rails are NOT o-ring ends, they are probably an NPT side, especially of there is a little taper to the diameter spacing.

Some pics of your rail and fittings might help.

 

[Fullboogie]

Here's a few pics of what I'm talking about. First two pics are the old rail with the AN fittings and fuel line. Third pic is the new rail with the funky -14 with o-ring fitting and that damned barbed end. So what I need is a -14 o-ring to -6 hose end fitting for the rail that will allow me to adapt the new rail to the old fuel system. Last pic you can see the measurement of the new fitting, which is slightly smaller than the theoretical 0.875" that a -14 should be.

I've got a drag race event this weekend and I'm needing two fittings this week, which is why I'm in panic mode. Thanks again for the help.

 

[JeremyH]

Measure the inside diameter, that's what I have always done with an, looks 10orb or maybe 12orb to me but hard to tell without a reference to the size with something else.

Do you not know the brand and specs of the rail? Is it really 14an bore and fitting? That's big, don't know if you will find a fitting that large going down to 6an male. What's the point of running that big rail with that's small of feed?


The barb on the fitting it came with looks to be 3/8 efi they make efi push lock to an male straight fittings as well.

 

[Fullboogie]

Of course I know the brand, it's Riva Racing - but those assholes universally refuse to reveal any specs on anything they make. And they are the only manufacturer of aftermarket fuel rails for my ski. I have no idea why in the hell they would go with such an unusual size for the rail fittings. It makes no sense. But it is what it is. From the measurements I've taken, including threads per inch, it's a -14 straight AN with 14 threads per inch. Vibrant makes a fitting that adapts down to -6 hose end, and that's what I think I need.

Right now I just need confirmation that the 0.865" that is in the picture above works out to a -14 fitting. Thanks.

 

[JeremyH]

You divide the an number by 16 so -14 comes out to .875 but on a chart that refers to ID usually.

You could keep that fitting in the rail and get a 3/8 efi to 6an male fitting it would lock on the barb and allow you to run the 6an line.



Looking at it that cant be -14orb, that would be larger than it looks to me. The 10orb I have sitting right here has a .625 ID and .750 OD.

Which would make -12orb .750 ID and .875 OD.

Measure the inside.


-12orb to 6an male is much easier to find also doing a quick search.

 

[Department Of Boost]

I'll bet dollars to doughnuts that is a -10 AN O-Ring which has a thread of 7/8-14. Or .0875-14 if you will. Which is right on top of your .0865 OD. And the scale of a -10 looks right too.

Summit link:
http://www.summitracing.com/parts/rus-670650/overview/

 

[Fullboogie]

Fuck me - I already ordered a set of -14's by two day air from Summit. I thought the "-6" or "-8" referred to the OD, not the fucking inside diameter, so that's why I assumed that the .0875 threads meant it was a -14. Fuck me, fuck me.

And Jeremy - I have to get rid of the barbed fitting and go with at least a -6 line because I need the fuel flow and volume. The ski is running a full Aeromotive fuel system (pumps, regulator, lines, etc.) to feed 17 lbs of boost and about 340 hp on a 1.8L engine. Drag race ski FTW.

Thanks a ton guys for helping me.

 

[Department Of Boost]

Fuck me - I already ordered a set of -14's by two day air from Summit. I thought the "-6" or "-8" referred to the OD, not the fucking inside diameter, so that's why I assumed that the .0875 threads meant it was a -14. Fuck me, fuck me.

Um, sorry.

 

[Fullboogie]

Well, I called Summit to cancel and place a reorder. The tech on the line spent quite a bit of time with me, and here's what he says. Regular AN fittings are measured by ID, just like you guys said. But o-ring fittings, like the ones I need, are in fact measured by OD of the threads, so what I ordered is supposed to work. I'm really confused at this point.

Plus, I've got Jeremy saying what I need is a -12 orb, and DOB saying I need a -10 orb! You guys are killing me! Who's right?

 

[Department Of Boost]

That tech is a moron.

AN o ring threads are identical to AN 37deg threads. If you want to make a standard 37deg AN fitting into a AN o ring all you have to do is machine off the 37deg tip and put an o ring on it.

AN o ring fittings will thread right into standard female AN's, and vice versa. They won't seal but they are the same thread.

 

[Fullboogie]

Sooo, taking my example into account with a thread OD of .865, does that work out to a -10 o-ring fitting, or a -12 o-ring fitting? Or do I need to bring my ass home and measure the ID of the thing and go from there?

 

[Department Of Boost]

Sooo, taking my example into account with a thread OD of .865, does that work out to a -10 o-ring fitting, or a -12 o-ring fitting? Or do I need to bring my ass home and measure the ID of the thing and go from there?

-10

I'm surprised it is even that big on a fuel rail. -10 is a BIG fuel rail fitting.

There is no way it's a 12 or 14.

 

[Sky Render]

Anyone have a link to how AN fittings work and are measured? 'Cause y'all got me confused now.

 

[Department Of Boost]

Anyone have a link to how AN fittings work and are measured? 'Cause y'all got me confused now.

AN stands for Army Navy.

The dash (-) sizes are the ID in 1/16ths. For example, a -8 is 8 1/16th which is a 1/2".

-6=3/8
-8=1/2
-10=5/8
-12=3/4

 

[Fullboogie]

-10

I'm surprised it is even that big on a fuel rail. -10 is a BIG fuel rail fitting.

There is no way it's a 12 or 14.

I can put my thumb inside the threaded opening, so yeah it's big. Keep in mind the HP it's making and the fact that it's only one rail feeding that thing.

Thanks a ton for helping out.

 

[Department Of Boost]

You can make 1500hp on a single -10.

 

[Fullboogie]

Right off of Rusell's website. Looks like I have a -10. DOB wins the prize!

 

[Department Of Boost]

Right off of Rusell's website. Looks like I have a -10. DOB wins the prize!

I don't get to use this guy enough^^^^