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Modern coil over plug

Old Marine Engine » Timers, Magnetos, Ignition » Modern coil over plug « Previous Next »

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Ernie
Senior Member
Username: ernie

Post Number: 1074
Registered: 01-2002


Posted on Wednesday, October 14, 2009 - 10:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The more things change the more they stay the same.
Pics of plug coils from years ago. 1 coil per cylinder. These were powered and the timer gave a ground. A multi cylinder engine would be wired similar to the modern diagram below except the 3rd wire (terminal B) would not be there. The vibrator points were in the coil.
Pics from another OME post


Modern style one coil per plug the coils are powered and the PCM (engine computer)is a switch to ground just like the timer on an old engine. To clairfy if you need to just draw a 4 cylinder timer in place of the PCM.
What I need to do is tourture one and see if it will live with a long on time that an old timer gives. Also the timer will be opposite from using a buzz coil as a buzz coil makes spark when the timer turns on. These are a true ignition coils and make spark when the timer turns off. No biggy once you are used to it.
I also need to find a good way to shorten the boot as it is about 6 inches long.

Pic and diagram courtsey Mazda
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RichardDurgee
Senior Member
Username: richarddurgee

Post Number: 2213
Registered: 11-2001
Posted on Thursday, October 15, 2009 - 06:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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1914


plug14

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RichardDurgee
Senior Member
Username: richarddurgee

Post Number: 2214
Registered: 11-2001
Posted on Thursday, October 15, 2009 - 08:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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Per14

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Searcher
Senior Member
Username: searcher

Post Number: 357
Registered: 10-2004
Posted on Thursday, October 15, 2009 - 01:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

A couple of years ago, I caught an advertisment for a foreign car that was touting coil plugs as the latest and greatest advancement in automobile ignition. Yea, right. The Orswell Ignition System has a 1907 patent date so I guess that put Orswell ahead of the curve a century too early.

Here are four of the commonest (old) coil plugs. There were several other companies that made them as well. There aren't many old ones around as they probably never were common to begin with due to the price. A coil plug cost in the range of $8 - $9 at a time when a good spark plug could be had for $0.50.

I apologize for the poor photos. These coil plugs are really much better looking than the photos would have you believe. Clearly, I need to take a class in lighting.




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RichardDurgee
Senior Member
Username: richarddurgee

Post Number: 2215
Registered: 11-2001
Posted on Friday, October 16, 2009 - 12:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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1913

pkn131
pkn131a

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