| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
10-29-2018, 09:34 PM
|
|||
|
|||
AFB fuel line flare spec
Anyone know the specs for the AFB fuel line flare? 37 or 45 deg, single vs double flare? Thx in advance
|
|
#2
10-29-2018, 09:37 PM
|
||||
|
||||
|
Going to be 45 degree double flare, the fittings used were inverted flare fittings commonly used for fuel lines and transmission fluid lines on cars back then.
A pair of '66 GTO AFB carbs with 3/8" inverted flare fittings, made up from steel brake line tubing sourced from my local NAPA. 
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
|
#3
10-29-2018, 10:26 PM
|
|||
|
|||
|
Thanks for the info. Being that this is just fuel line and not high pressure brake line, any reason it couldn't be single flare as opposed to double flare? Just curious.
|
|
#4
10-29-2018, 10:31 PM
|
||||
|
||||
|
I've never seen inverted flare fittings use anything but a double flare on the tubing.
Tri-Power reproduction aluminum fuel lines are all double flare. I see no reason not to double flare all of your inverted flare hard lines. I doubt a 45 degree single flare would seal very well, you probably need both layers of material to crush down and form a good seal.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
|
#5
10-29-2018, 10:50 PM
|
|||
|
|||
|
Ok ... Thanks.
|
|
#6
10-30-2018, 04:24 AM
|
||||
|
||||
|
It's not about sealing it's about strength and why all brake and fuel lines are double flared, not single. Single flaring brake lines or even fuel lines is a recipe for disaster.........Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
|
#7
10-30-2018, 08:00 AM
|
||||
|
||||
|
The 37 degree versus 45 degree angles have to do with material.
Some 40 years ago, we supplied custom fuel lines for tripowers, dual quads, etc. Some enthusiasts were starting to ask about stainless lines. Called a stainless tubing supplier, to order 5/16 and 3/8 stainless tubing. The customer service rep (engineer) asked what my intentions were. After I explained, he told me ALL (up to that time) automotive fittings used a 45 degree angle, and that stainless could not be flared safely more than 37 degrees. The company refused to take my order. Guess they were worried about liability. After that conversation, I talked to a couple more engineers, with the same result, so I gave up on trying to supply stainless fuel lines. Fittings for stainless are 37 degrees. Jon
__________________
"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
|
#8
10-30-2018, 08:25 AM
|
||||
|
||||
|
Stainless brake lines are 45 degree, aren't they?
__________________
Clutch Guys Matter _______________________________________ 53 Studebaker, 400 pontiac 72 4-4-2 Mondello's VO Twister II 1964 F-85 Home of the 700hp small-block Olds **Still wanting a 64 Bonneville or Catalina** |
|
#9
10-30-2018, 09:02 AM
|
|||
|
|||
|
I believe they are 37 degrees. -3, -4 AN brake lines and fittings are 37 degree.
|
|
#10
10-31-2018, 01:06 PM
|
||||
|
||||
|
Not sure I understand how that is possible. If the factory brake and fuel lines are 45 degree DF, and you buy a stainless brake line kit, then the stainless has to be 45* DF, right?
__________________
Clutch Guys Matter _______________________________________ 53 Studebaker, 400 pontiac 72 4-4-2 Mondello's VO Twister II 1964 F-85 Home of the 700hp small-block Olds **Still wanting a 64 Bonneville or Catalina** |
|
#11
10-31-2018, 06:54 PM
|
||||
|
||||
|
When you buy a stainless steel brake line kit they're not expecting you to replace all the factory fittings with 37-degree parts. These kits are made to replace OEM steel brake lines with 45-degree double flares.
If you're starting from scratch on a race car you might be using AN 37-degree fittings for the brake lines but certainly not on a street car that's already set up for 45-degree inverted flare fittings.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
|
#12
10-31-2018, 09:08 PM
|
|||
|
|||
|
Yes, I wasn't thinking of OE replacement SS brake lines. They would have to use the matching 45 degree double flare. Possibly they are using a slightly different SS alloy with a little copper in it to make the flares without cracking? If you really want better info, I would give Inline Tube a call and talk to them. I will research this a little at PRI if I get the time.
|
|
#13
11-01-2018, 07:08 AM
|
|||
|
|||
|
Bought Stainless brake lines for my 67 bird. My wilwood master cylinder and adjustable proportioning valve required modifications to the lines. 45 degree double flares are near impossible in a home shop. Ended up annealing the ends of the lines to be able to get a double 45 degree flare without cracking. Ill never use stainless lines again. It was a real B;#ch. Nicop for me from then on.
__________________
Who cares about the horsepower wars, Indians win the torque wars. Roger |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
