mgtd51 at comcast.net
Wed Dec 19 06:37:14 MST 2007
Doesn't the BJ8 electric tach require a loop in the wire for it to work
correctly? If so, the overhand knot seems to make sense.
Awgertoo at aol.com wrote:
> In a message dated 12/19/2007 12:01:00 A.M. Eastern Standard Time,
> gbrierton at hotmail.com writes:
> OK, Michael, I have got to hear more about how that would work! Can
> somebody please explain this to a non-electrical engineer (me)?
> Hi Gary--
> Well, as Dave Barry says: "I AM NOT MAKING THIS UP!" I was shown this
> trick when I was a young kid hanging around the shop of an old geezer mechanic.
> He simply said that the knot "cancelled" the EMI (electromotive interference)
> and it did work, at least on my car, a TR3. Now this was for an AM radio
> and back then (1958 or so) ignition wires were, I am sure, solid copper.
> Perhaps resistor wires would do as good or better job but Dan said he did not want
> to use them.
> You're not the only Doubting Thomas in the group and subsequent to my post I
> did a bit of google searching for anything online about this. Go to
> (http://www.overclockers.com/tips1132/index03.asp) and scroll down till you find the following:
> "Al Smith aka oldbrave says:
> "This is not A NEW IDEA!
> In 1956 and 1957, Ford Motor Co. used this very simple solution on the coil
> wire of the Thunderbird to greatly reduce EMI to the radio and it had no
> apparent effect on the operation of the Ignition system! As a matter of fact,
> it's something that knowledgeable collectors look for in the identification of
> original and/or properly restored cars!"
> Twisting wires cancels or reduces magnetic interference--for example the
> positive and negative wires running to DC compass lights on boats are always to
> be twisted so that they will not induce a magnetic effect on the compass card
> when the circuit is energized.
> That's about all I can tell you--perhaps Dan will share with us how it worked
> out for him.
> Best--Michael Oritt
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