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Double Flared Tubing
#1
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BigKev
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Well the time have come for me to start running new lines to just about everything (fuel, brakes, tranny, vacuum, oil, etc). So I need to go buy a flaring tool. Does all of the compression fittings on the Packard use a standard 45 degree double flare? Are any lines use a single flare?

Also do any of the lines use a 37 degree flare?

I am just trying to cover all the bases here.

Thanks,

Posted on: 2006/12/18 12:09
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Re: Double Flared Tubing
#2
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BH
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All of the brake lines that I've replaced on my '55-'56 Packards had the 45-degree double upset flares.

I'm not sure about the steel fuel and vacuum lines as I haven't made of those yet, but do know the tube for the choke heat pipe is swedged for a slip fit the exhaust crossover fitting.

Not to drift off-topic, but I've attached a pic of a great tool to help form the tubing without kinking.

This is K-D Tool's #2189 tubing bender, but the one I have is from Plews - looks identical, but has red vinyl-coated handles. I picked it up from a "tool trailer" at a swap meet several years ago; perhaps Plews sold out on this one to K-D. To date, this bender has done everything I needed - except for a very tight 90-degree bends, close to the fitting, on a later model car.

Attach file:



jpg  (4.78 KB)
103_45d2a17d06dbe.jpg 300X167 px

Posted on: 2006/12/18 19:06
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Re: Double Flared Tubing
#3
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PackardV8
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There is NO vehicular application for single flare. That is to say, any all and every tubing flare for vehicles requires the double inverted flare. This is due to both pressure issues AND VIBRATION issues. Therefore AVOID stainless steel lines etc. As for the 37 vs 45 degree i'm not sure. My double flaring tool has done them all that i've ever needed across many applications and i believe it's 45 degrees but would have to double cheque to be sure.

Posted on: 2006/12/18 22:23
VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
http://packardinfo.com/xoops/html/mod ... ewtopic.php?topic_id=7245
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Re: Double Flared Tubing
#4
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PackardV8
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Recently i noticed one exception to the double flare. It was on a Al. toyota air-con line. I was amazed that such a high pressure line would have only a single flare. I Havn't had a chance to check any GM air-con lines tho.

Posted on: 2006/12/18 22:31
VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
http://packardinfo.com/xoops/html/mod ... ewtopic.php?topic_id=7245
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Re: Double Flared Tubing
#5
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BigKev
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Thanks for the information good to know. Do use guys use all steel lines? I want something that is going to stay nice looking under the hood.

Posted on: 2006/12/19 13:56
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Re: Double Flared Tubing
#6
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BH
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I used to think stainless was the way to go, but I have to agree with Keith about avoiding stainless steel lines. Getting stainless to seal against cast iron seems to pose a problem.

Bending your own lines is not that hard, with the right tools, but be sure to get a good quality flare tool and make a couple of test flares to confirm that it works properly. I have one that the dies didn't quite line up perfectly, and I freqeuntly got leaky connection as a result.

Getting back to materials, if you use DOT 5 (silcone-based) fluid, you minimize the problem of moisture being drawn into the system and causing the steel lines to rust form the inside out.

However, do NOT use DOT 5 in any ABS brake system.

Also, NEVER use copper for brake lines.

Always use double-walled steel lines for hydraulic brake applications. Tubing with polyvinyl fluoride coating is now available, but I would avoid that, too, as the coating tends to crack at bends, holding moisture, which leads to rust. I am fine with the traditional zinc-plated stuff, but have used some spiral shield (as found on modern cars) to prevent road rash in highly vulnerable areas.

You should be able to get 25-foot coils of double-walled steel tubing from any reputable parts store. The stuff sold in coils seem easier to bend and flare than the pre-flared straight pieces that are available in assorted lengths. If you use the latter, be sure to check with the store to make sure you get the rigth type (45-degree double upset) for your car.

Some people use copper for non-hydraulic lines and some even paint it with alumminum-colored paint. I just use steel for everything.

Posted on: 2006/12/19 20:15
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Re: Double Flared Tubing
#7
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BigKev
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Thanks, thats good information. I wasn't aware that stainless had the kind of problems is does. It seams like every show I go to they are all using stainless now.

Posted on: 2006/12/20 12:53
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Re: Double Flared Tubing
#8
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PackardV8
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SS is TOUGH material. Difficult to form, machine or fabricate. Usualy special heavy duty tools and eq. are needed. If general application tools are used and IF they do the job they will not last long.
SS has become a fad more than anything else. Especialy SS brake parts. SS is VERY SLOW to dissapate heat. DOes that sound like a good material to use in brake systems???

Posted on: 2006/12/20 21:43
VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
http://packardinfo.com/xoops/html/mod ... ewtopic.php?topic_id=7245
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Re: Double Flared Tubing
#9
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PackardV8
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When u see alot of SS at shows then just remeber, it's a SHOW.

Posted on: 2006/12/20 21:49
VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
http://packardinfo.com/xoops/html/mod ... ewtopic.php?topic_id=7245
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Re: Double Flared Tubing
#10
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BigKev
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Are the fuel lines single flared? They just appear that way to me looking at them.

Posted on: 2007/1/14 16:12
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