Date: Mon, 25 Jan 1999 08:30:27 -0800
Reply-To: Davidson <wdavidson@THEGRID.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Davidson <wdavidson@THEGRID.NET>
Subject: Re: Metric to AWG wire size conversion chart
Content-Type: text/plain; charset="iso-8859-1"
Robert,
Just one last thought before I go off line for a day or two:
If we consider two of the largest wire sizes specified in the Bentley we can
see from the following that the numbers expressed in mm must be cross
sectional area and not diameter:
If we assume the wires represented by 25.0 and 70.0 to be diameters, then
25mm divided by 10 = 2.5cm divided by 2.5 = 1 inch diameter
70mm divided by 10 = 7.0cm = divided by 2.5 = 2.8 inch diameter
I don't think you will find a wire anywhere on any Vanagon that is 1 inch in
diameter not including the insulation. And certainly not 2.8 inches.
But, if we assume the wires represented by 25.0 and 70.0 to be cross
sectional areas (A = pi R2) then,
25mm2 divided by 3.14 (pi) = 7.96, sq root of 7.96 = 2.82 (radius) x 2 =
5.6mm diameter, 5.6mm divided by 10 = .56cm divided by 2.5 = .23 inch
diameter wire
70mm2 divided by 3.14 (pi) = 22.29, sq root of 22.29 =4.72 (radius) x 2 =
9.4mm diameter, 9.4mm divided by 10 = .94cm divided by 2.5 = .38 inch
diameter wire
I think if you look at the wires on the Vanagon you will find battery ground
wires and battery to starter wires of about .23 inch and .38 inch diameters
respectively.
And I think this proves that the mm specifications of wires in the Bentley
represent the cross sectional area and not the diameter of the wire.
And that means that the cross sectional mm2 to AWG chart that I reproduced
from Haynes yesterday does apply to the Bentley.
If I'm wrong about this, please show me where. I love to learn or I wouldn't
be on the list.
Thanks for the fun.
Bill
90 Westy Syncro
-----Original Message-----
From: Robert A. Alexander <satcong@vol.com>
To: Davidson <wdavidson@thegrid.net>
Date: Sunday, January 24, 1999 9:12 PM
Subject: Re: Metric to AWG wire size conversion chart
>Bill - Take a look in your Bentley at pre-'85 vs post-'85 schematics of
>the wiring and it will give you a feeling for the AWG vs "mm" size. The
>'83/'84 Digijet shows an AWG #2 running to the starter. The '85 shows a
>"35mm" going to the starter. The '86 shows a "70mm" going to the
>starter.
>
>Darrell & I have been corresponding abut this and we think there is a
>misprint in the Bentley.
>
>Remember, should your auxillary battery become discharged, you might
>pull as much as much as 60+ amps while recharging it. You won't do this
>very long with AWG#10.
>
>BOB
>
>ps - if you have a piece of #12 house wiring lying around, take a ruler
>and measure the diameter of it. It's about 2mm.
>
>
