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Old 12-02-2008, 12:10 AM
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Tryin to figure out -AN sizes

I've got a 84 Cutlass thats still under construction with a Chevy 383. I'm building it for street/show. I want all stainless braided hoses with -AN fittings. My question is how do I determine what size hose and what size fittings I need. Heater hoses, a/c hoses, power steering & trans lines are what I need. I already have Taylor braided battery cables & braided ignition wires in the mail. Any & all advice is appreciated.

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Old 12-02-2008, 12:24 AM
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You could always measure the inside diameter of the hoses with a tape measure then purchase the right size hoses with fittings.
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Old 12-02-2008, 12:27 AM
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Starting with -04 AN = 1/4", each number increase adds 1/8">>
-04=1/4"
-06=3/8"
-08=1/2" etc......
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Old 12-02-2008, 12:32 AM
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Dont know if it will help or if you already know but all I know is the number stands for 16ths of an inch od of the tube so -2 = 1/8...-3 = 3/16 and so on I have no clue on what size hose fits what though...

Last edited by 74Ventura; 12-02-2008 at 12:37 AM. Reason: my math sucks..lol
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Old 12-02-2008, 12:33 AM
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Cool. Is it difficult to connect the fittings to the hoses with hand tools? Or should I purchase the kit to attach them? Anyone have problems with them leaking?
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Old 12-02-2008, 12:42 AM
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Quote:
Originally Posted by labreejr
Cool. Is it difficult to connect the fittings to the hoses with hand tools? Or should I purchase the kit to attach them? Anyone have problems with them leaking?
Check out some sites about assembly etc.. I don't think the special AN wrenches are neccesary, just be easy when tightening, they don't need that much torque. May want something to help hold the hose in a vise when cutting. It appears once you get to size AN-12 the increments jump to 1/4".
http://www.smokemup.com/tech/an_thread_sizes.php

http://www.bakerprecision.com/hose.htm

http://www.purechoicemotorsports.com/

http://hydraulics.eaton.com/products...PE-MC001-E.pdf

http://russellperformance.com/new/
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Old 12-02-2008, 02:35 AM
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The AN number is in sixteenths.

6AN is 6/16" or 3/8"

Just copy what the factory did. Fuel line was 3/8", so use 6AN. There is nothing wrong with upsizing fuel line to 8AN, but it won't gain you anything, and you'll just have to adapt up from the factory 3/8" line.

Some things should stay the same, others can be improved. A/C lines should stay the same size. Power steering lines can be enlarged a bit, but again you'll just have to adapt up and then back down. Power steering lines also need special consideration. Regular braided AN hose won't do it because power steering can pretty easily exceed 2000 psi which is beyond what most braided hose can handle. Brake hoses also need special consideration since they can also exceed 2500 psi. Transmission hoses are pretty easy. Keep them at least as big as the factory 5/16" hose. The tranny cooler lines only see about 30-50 psi, so regular braided hose will be fine.
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Old 12-02-2008, 05:04 AM
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Curtis is right on all accounts. PLus you better have deep pockets as this is an expensive endevor. You dont need special tools to do the lines, however there are special aluminum jaws that go in your vise to hold the fittings during assembly-- i HIGHLY recommend them---and when you do assemble them, use lots of lube on the threads, then clean the lines out with some brakekleen. I do not recommend braided line to run the full length of the car for fuel line as the vapors seep through the rubber and can really stink up the garage. Run as much hard line as you can for the fuel system.

This was my single turbo big block in my dart i had a few years ago---i bought alot of used fittings and lines and i still had in the neighborhood of $600-700 in it. Its really hard to see all of whats there, but almost everything is braided stainless steel and aluminum fittings.

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Old 12-02-2008, 08:06 AM
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AN stands for Army/Navy. It was developed for military use and each numerical size increase adds 1/16". Anyone who says otherwise is just plain wrong. Each AN size also uses a specific SAE thread. Check the link below for accurate information. AN Size Chart
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Old 12-02-2008, 09:24 AM
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I don't think anyone would argue that Centerline. AN fittings were designed by the JIC - Joint Industrial Commission. It was a WW2 thing. Allied forces were all over the board when it came to maintenance and repairs of their aircraft and military vehicles. They designed a standard sizing, thread, and flare so that when a US plane needed service in Europe, the parts were available off the shelf instead of having to adapt and guess.
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Old 12-02-2008, 09:49 AM
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Old 12-02-2008, 10:53 PM
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AN fittings

Wow! everything I wanted to know but was afraid to ask. I've been thinking about replacing my hoses with braided lines but couldn't figure what the heck was going on with the An fitting sizes. Now I feel really stupid for not just asking. Thanks much fellers. Pops
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