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Re: 1977 MGB-Running on

To: Simon Matthews <simon_atwork@hotmail.com>
Subject: Re: 1977 MGB-Running on
From: Art Pfenninger <ch155@freenet.buffalo.edu>
Date: Thu, 10 Jun 1999 21:12:19 -0400 (EDT)
It may not calculate but it is true. I put a diode in and it stopped the
problem immediately. Per John Twist this was the answer.
...Art

On Thu, 10 Jun 1999, Simon Matthews wrote:

> Simple calculations show that it is very unlikely that it is current through 
> the ignition light that is keeping the engine running.
> 
> The current through the ignition light is at most .2A -- that assumes there 
> is minimal extra resistance in the circuit. Since energy in an inductor is 
> calculated as I2L, and the normal peak current in a coil is about 3-4A, this 
> means that, if the current flows through the ignition light and then into 
> the coil, the energy stored in the coil is about 1/400 of the energy stored 
> under normal running conditions (20 squared). I seriously doubt this is 
> enough to fire a cylinder.
> 
> So, the problem must lie elsewhere. The dimly lit ignition light may provide 
> a clue to the problem, but I am quite sure that current through this light 
> is not the solution.
> 
> Simon ('57 MGA)
> 
> 
> 


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