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Coil Cooling Tubes

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ianwilson2

Joined: 06 Jan 2008
Posts: 33
Location: France

Posted: Tue Feb 17, 2009 1:26 am Post subject: Coil Cooling Tubes

In my 2200A installation manual it says to fabricate some cooling tubes for the ignition coils on the ram air ducts.  As my plane hasn't flown yet, can anyone with running experience tell me whether I need to do this or not?  It looks to me that the holes already in the ducts are aligned fairly well with the coils, so they will get a fair amount of cool air.



Many thanks in advance.



Ian Wilson

N1BZRich(at)AOL.COM
Guest

Posted: Tue Feb 17, 2009 7:29 am Post subject: Coil Cooling Tubes

Ian,

     My experience based on two Jab 3300 installations  is that the cooling tubes are worth the effort.  My aircraft (a highly  modified Esqual) has about 530 hours in just over 3 years.  It has had  no ignition coil issues - it has had the blast cooling tubes from day one.   On the aircraft that our EAA chapter built (a 601XL) that has about 200 hours in  just under 2 years; it had a coil failure about 10 hours ago.  It now  has the two blast cooling tubes.  My guess is that the existing holes  in the ducts are adequate for cooling the starter but not sufficient for long  life of the coils.  

 Blue Skies,

 Buz Rich

 Williamsburg, VA

 Need a job? Find an employment agency near you.

Rickey B.

Joined: 22 Mar 2008
Posts: 70

Posted: Tue Feb 17, 2009 7:37 am Post subject: Coil Cooling Tubes

Now, here's a question for you, Ian… in adding the coil cooling tubes, do you think you have robbed the starter of its cooling blast of air? Don't you have to use the same holes for the coil coolers as the ones that supply the air for the starter?  

                        Just curious… I am running a Jab 3300 also.  

                                    Rick  

   

     

Ian,  

    

    My experience based on two Jab 3300 installations is that the cooling tubes are worth the effort.  My aircraft (a highly modified Esqual) has about 530 hours in just over 3 years.  It has had no ignition coil issues - it has had the blast cooling tubes from day one.  On the aircraft that our EAA chapter built (a 601XL) that has about 200 hours in just under 2 years; it had a coil failure about 10 hours ago.  It now has the two blast cooling tubes.  My guess is that the existing holes in the ducts are adequate for cooling the starter but not sufficient for long life of the coils.    

    

Blue Skies,  

    

Buz Rich  

    

Williamsburg, VA  

  

   

   

    [quote]



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[b]

N1BZRich(at)AOL.COM
Guest

Posted: Tue Feb 17, 2009 7:58 am Post subject: Coil Cooling Tubes

In a message dated 2/17/2009 10:38:20 A.M. Eastern Standard Time,  Rick.Beckman(at)atk.com writes:

  	  Quote: 	
		  Don't you have to use    the same holes for the coil coolers as the ones that supply the air for the    starter? 	


 

 Rick,

     I did not use the same holes.  I fabricated  "blast tubes" from small pvc pipe that blow directly on each coil.  The  left coil "blast tube" comes from the back end of the left duct, has a 90 degree  elbow and then blows directly on the left coil.  The right "blast tube"  comes out of the right duct just aft of the back cylinder, has a 45 degree  fitting and then an extension that takes it to the right coil.  The end of  this "blast tube" that is inside the duct is cut at 45 degrees to pick up blast  air from the aft end of the duct.  Hope this helps,

 Blue Skies,

 Buz Rich 

 Need a job? Find an employment agency near you.

Rickey B.

Joined: 22 Mar 2008
Posts: 70

Posted: Tue Feb 17, 2009 8:02 am Post subject: Coil Cooling Tubes

It does help. Thanks!  

                        Do not archive  

    [quote]



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[b]

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Tue Feb 17, 2009 10:30 am Post subject: Coil Cooling Tubes

Unless I'm missing something, why do you think you need to cool the  

starter? It only operates for 2-3 seconds and unless something is  

VERY wrong, it should not get hot during that short run.



When I first got my engine back in 2005, Ben Krotje told me they  

"hardly ever" saw the need for the cooling tubes to the coils.  

BUT...this was in 2005...things may have changed. I went ahead and  

put the tubes in anyway, and had no coil issues for as long as I had  

coils.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 605 hrs

Sensenich 62x46

Electroair direct-fire ignition system

New skis done and flying





On Feb 17, 2009, at 10:37 AM, Beckman, Rick wrote:



 	  Quote: 	
		               Now, here's a question for you, Ian… in adding the coil  

 cooling tubes, do you think you have robbed the starter of its  

 cooling blast of air? Don't you have to use the same holes for the  

 coil coolers as the ones that supply the air for the starter?



                         Just curious… I am running a Jab 3300 also.



                                     Rick



 Ian,



     My experience based on two Jab 3300 installations is that the  

 cooling tubes are worth the effort.  My aircraft (a highly modified  

 Esqual) has about 530 hours in just over 3 years.  It has had no  

 ignition coil issues - it has had the blast cooling tubes from day  

 one.  On the aircraft that our EAA chapter built (a 601XL) that has  

 about 200 hours in just under 2 years; it had a coil failure about  

 10 hours ago.  It now has the two blast cooling tubes.  My guess is  

 that the existing holes in the ducts are adequate for cooling the  

 starter but not sufficient for long life of the coils.



 Blue Skies,



 Buz Rich



 Williamsburg, VA



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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Wed Feb 18, 2009 12:31 am Post subject: Re: Coil Cooling Tubes

The cooling tube mod came out after there was a high coil failure rate. This was the different make of coils that are never used now.



I ran an infrared temperature check on my coils after flight, only the left side behind cyl 4 was a little warm. seing that its directly behind the duct just drilled a bleed hole in the duct for it.



Ralph

_________________
Ralph - CH701 / 2200a

ianwilson2

Joined: 06 Jan 2008
Posts: 33
Location: France

Posted: Wed Feb 18, 2009 1:45 am Post subject: Re: Coil Cooling Tubes

Thanks Buz, Rick, Lynn and Ralph for your experience.  That's the great thing about forums like this.  I think that I'll have a check on the critters after I'm flying and monitor how cool, or not, they are and take it from there.  Should be an easy mod to do retrospectively.



I could spend the rest of my life modifying this and that but never end up flying the thing!



Thanks again.



Ian

notsew_evets(at)frontiern
Guest

Posted: Wed Feb 18, 2009 7:33 am Post subject: Coil Cooling Tubes

Homebuilt aircraft are never "done".

There will always be something to fix or improve.  Thats the game we play...



SW

---

dhonabach

Joined: 19 Jan 2009
Posts: 13

Posted: Wed Feb 18, 2009 8:40 am Post subject: Coil Cooling Tubes

And once you truly do stop finding stuff to fix/improve then it is time

for a new plane 



Don



do not archive



--

cffd(at)pgrb.com
Guest

Posted: Wed Feb 18, 2009 6:25 pm Post subject: Coil Cooling Tubes

Ian,



Look at http://www.geocities.com/cffd66/Airplane/BlastTube.html to see how I 

used 1/2" CPVC.

The one on the left coil is cut at a 45 degree towards the front to allow 

the air to expand forward and cool the coil that is slightly forward of the 

tube.  I used JB Weld to cement the tubes in place.



Chuck D.

N701TX

 	  Quote: 	
		  

 Time: 01:27:55 AM PST US

 Subject: Coil Cooling Tubes

 From: "ianwilson2" <ianwilson2(at)hotmail.com>

 In my 2200A installation manual it says to fabricate some cooling tubes 

 for the

 ignition coils on the ram air ducts.  As my plane hasn't flown yet, can 

 anyone

 with running experience tell me whether I need to do this or not?  It 

 looks

 to me that the holes already in the ducts are aligned fairly well with the 

 coils,

 so they will get a fair amount of cool air.



 Many thanks in advance.



 Ian Wilson

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