From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: DH Lines- LNC-2's retrofit
To: lml
Date: Thu, 15 Feb 2007 17:30:18 -0500
Message-ID: <web-1840462@logan.com>
In-Reply-To: <87C33F695961494D886EB3B6C8A47651256118@s3server.Systems3.local>
References: <87C33F695961494D886EB3B6C8A47651256118@s3server.Systems3.local>
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Posted for "Craig Berland" <cberland@systems3.net>:
  Marv,
For ref:  303 SS tensile is 90ksi.
  Tensile for 3003 in the "O" condition & cabin temperatures is 16ksi
  Tensile for 5052 in the "O" condition & cabin temperatures is 28ksi
  Tensile for type T & H Nylaflow, Nylon 6/6 & cabin temperatures is 12ksi
  (Type T in 3/16 dia is .025 wall and type H in 3/16 dia is .038 wall)
  Both aluminum alloys are more than adequate for brake lines that are
  3/16 dia and .025 wall unless you "kink" it...<g>
  The aluminum is much more cut resistant.
  As far as minimum diameter, I don't know. I'd use 3/16 because I don't
  have a 1/8 diameter bender....how's that for engineering principle.
  Craig Berland

  Marv wrote:
"""
  What's the smallest ID hard line that would be appropriate
  for the brake line runs from the pedals to the wheel wells?  I have some
  1/8" versatube that I bought for this purpose way back when, but I'm
  afraid that #1 its working pressure is too low and #2 the .069ID may
  simply be too small to allow the brakes to respond to pedal inputs
  quickly enough.  There's hardly any weight increase going to 3/16od,
  .135id, so that would be ok by me.  Also, instead of the versatube
  (3003) would it make more sense to use 5052?  Stainless for the interior
  runs seems like way overkill.  Thoughts or comments?
"""

[Thanks, Craig... that helps put things into perspective.  I chose the 1/8" 
3003 because
of its great flexibility.  You don't need a regular tubing bender to bend it, 
just those
springs that cradle the material through the bend process that limit the bend 
radius and
keep the walls from collapsing.  I figured once they were run they would be 
protected behind
the uphostery or carpets and wouldn't have an chance to get beat up.  Anyway, 
now if I
find that .069ID will flow enough to get the job done I don't have to change 
anything <g>

Thanks again.    <marv>   ]