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Booster Coil needed please

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Looigi

Joined: 20 Apr 2015
Posts: 80
Location: Christchurch, New Zealand

Posted: Mon Jun 18, 2018 9:14 am Post subject: Booster Coil needed please

Hi All,



Does anyone have a KP-4716 or DH-2 Booster (shower of sparks) coil they wish to part with please?  Doug is out of stock.



The one in our Yak-52 has died after only 35 hours in use.



Many thanks

Chris

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mark.bitterlich(at)navy.m
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Posted: Mon Jun 18, 2018 9:38 am Post subject: Booster Coil needed please

You might consider removing it from the aircraft and testing it on the bench.   It's hard to grasp why it would fail in 35 hours.  Although it is easy to imagine that power to the unit, or a bad wire to the mag could happen.  These puppy dogs are also adjustable for the gap in the points inside.  



Mark

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Vic

Joined: 12 Aug 2008
Posts: 113
Location: Southern Bavaria

Posted: Mon Jun 18, 2018 6:57 pm Post subject: Re: Booster Coil needed please

Well, it is just another ignition coil, so it is mortal - remember coil troubles on M 14s ?? 



    Vic

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Looigi

Joined: 20 Apr 2015
Posts: 80
Location: Christchurch, New Zealand

Posted: Wed Jun 20, 2018 1:04 am Post subject: Booster Coil needed please

Hi Mark,



I pulled it out and had a look inside.  It had burnt the points out completely.  I replaced the points with a serviceable set from the old one, rigged up an automotive  spark plug and lead and bunged 24v into it.  The thing just arced across the points with very little output to the plug, so I think it has had a major internal melt down.



I have managed to source some through a friend in Murmansk so hopefully that will fix the issue.  



I think the high resistance I found across half of my spark plugs are the cause.  I am going to put Doug’s automotive kit in so hopefully it won’t happen again.



Thoughts

Chris



[quote] On 19/06/2018, at 5:36 AM, Bitterlich, Mark G CIV NAVAIR, WD <mark.bitterlich(at)navy.mil> wrote:

 

 You might consider removing it from the aircraft and testing it on the bench.   It's hard to grasp why it would fail in 35 hours.  Although it is easy to imagine that power to the unit, or a bad wire to the mag could happen.  These puppy dogs are also adjustable for the gap in the points inside.  

 

 Mark

 

 

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mark.bitterlich(at)navy.m
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Posted: Wed Jun 20, 2018 6:56 am Post subject: Booster Coil needed please

I think you nailed it.



Mark

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Rob Rowe

Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK

Posted: Thu Jun 21, 2018 6:44 am Post subject: Re: Booster Coil needed please

Chris,

If the points are burned out and the performance deprecated then possibly the internal capacitor (or more likely its connections) across the points has failed; hence the arcing and lack of output.

I've attached a couple of images - a simple schematic of the KP-4716 function and a cross-sectional Russian drawing showing the internal layout, with what looks like a waxed paper/foil capacitor (13). If it is of that construction then it will neither like prolonged exposure to heat or moisture.

Hope this is of some help.

Brgds, Rob R

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Viperdoc

Joined: 19 Apr 2014
Posts: 484
Location: 08A

Posted: Thu Jun 21, 2018 2:39 pm Post subject: Booster Coil needed please

This is what I installed on my 50 after the shower of sparks failed. Works great. 

Doc



Sent from my iPad



 	  Quote: 	
		   On Jun 21, 2018, at 9:44 AM, Rob Rowe <yak-list(at)robrowe.plus.com> wrote:

 

 

 

 Chris,

 If the points are burned out and the performance deprecated then possibly the internal capacitor (or more likely its connections) across the points has failed; hence the arcing and lack of output.

 I've attached a couple of images - a simple schematic of the KP-4716 function and a cross-sectional Russian drawing showing the internal layout, with what looks like a waxed paper/foil capacitor (13). If it is of that construction then it will neither like prolonged exposure to heat or moisture.

 Hope this is of some help.

 Brgds, Rob R

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=481059#481059

 

 

 

 

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 http://forums.matronics.com//files/kp4716_schematic_100.jpg

 http://forums.matronics.com//files/kp4716_175.jpg

 

 

 

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