Re: Ignition coil measurements

• To: tesla-at-pupman-dot-com
• Subject: Re: Ignition coil measurements
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Tue, 17 Nov 1998 16:13:25 -0700
• Approved: terryf-at-verinet-dot-com

> Original Poster: "James" <elgersmad-at-email.msn-dot-com> 
> 
> 
> >Original Poster: Scott Stephens <Scott2-at-mediaone-dot-net>
> >
> >I measured an ignition coil and found the following:
> >
> >Core in:
> >primary:
> >L=6mH R=1.6 ohms Q=20 (tested with .1uF -at- 3.8 KHz, sharp response)
> >step up ratio=86 (measured with 600 Hz signal)
> >
> >2ndary:
> >L=67H R=8K ohms Q=3 (tested with .1uF cap -at- 65 Hz 3dB BW; sharp lower break
> >point, upper response rolls off more gradualy)
> >
> >K= 0.81  which I derived from (correctly? seems .3 too high for solenoid)
> >Step-Up Ratio Measured (86) / SquareRoot [L-2ndry (67H)/L-pri (.006H)]
> 
>     It's in a tin can, and that changes the magnetic ciruit alot, because
> it's a perfect closed loop, and they use alloy wire which is partly
> ferro-magnetic.  You could easily check that with a magnet.

The ones I've seen here are in aluminium. That might explain the 
lousy Q. Shorted turn and all that.

?
Malcolm
<snip>

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