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cooling the ignition coils

 
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alvie102(at)yahoo.com
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PostPosted: Wed Feb 18, 2009 1:21 pm    Post subject: cooling the ignition coils Reply with quote

Hi All--
While perusing the recent correspondence about cooling the ignition coils with blast tubes, another facet of cooling the coils came to mind. I recall reading some time ago somewhere about Jabiru recommending using fiberglass washers on the cooling coils to isolate them from engine block heat.  
Now I can't find anything about that on the factory website (or anywhere else, for that matter).  I also have a question about where the washers would be installed.  On the outside of the coil under the bolt head wouldn't  seem to be nearly as effective as between the coil and the engine; yet that raises the question of offsetting the alignment of the  coils with the magnets on the periphery of the flywheel.
Thoughts, anyone?
Alvie
Sonex #102
Jab. 3300A
Ser.No. 174

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N1BZRich(at)aol.com
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PostPosted: Wed Feb 18, 2009 1:38 pm    Post subject: cooling the ignition coils Reply with quote

In a message dated 2/18/2009 4:22:17 P.M. Eastern Standard Time, alvie102(at)yahoo.com writes:
Quote:
between the coil and the engine


Alvie,
Between the coil and the engine is how my engine came and what I have continued to use for the past 500 + hours. The alignment of the coil is not a problem, but of course the gap between the coil and the magnet is critical, especially for cold weather starting.
Blue Skies,
Buz Rich
Need a job? Find an employment agency near you.
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Clive J



Joined: 03 Nov 2007
Posts: 340
Location: UK

PostPosted: Wed Feb 18, 2009 2:17 pm    Post subject: cooling the ignition coils Reply with quote

The fibre washers are indeed fitted between the coil and the engine. There maybe washers under the head as well, I can't recall?
My 2200 doesn't have them where as my 3300 does, it's all about when the engine was built. It's a good point about the alignment and although I thought about it I haven't ever examined the difference. the washers are quite thick. Maybe the engines with the washers fitted have a little metal removed from the mount area so the alignment is still good. I haven't retrofitted washers to my 2200 engine even though I heard about it. On that I did lose a coil at 700 hours though the other of the pair has now done 1060 hrs, neither engine has blast tubes (yet).
Maybe some one can have a look at an engine with washers? Be simple enough to gain some clearance.
Regards, Clive

From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Alvie Johnson
Sent: 18 February 2009 21:21
To: jabiruengine-list(at)matronics.com
Subject: cooling the ignition coils

Hi All--


While perusing the recent correspondence about cooling the ignition coils with blast tubes, another facet of cooling the coils came to mind. I recall reading some time ago somewhere about Jabiru recommending using fiberglass washers on the cooling coils to isolate them from engine block heat.


Now I can't find anything about that on the factory website (or anywhere else, for that matter). I also have a question about where the washers would be installed. On the outside of the coil under the bolt head wouldn't seem to be nearly as effective as between the coil and the engine; yet that raises the question of offsetting the alignment of the coils with the magnets on the periphery of the flywheel.


Thoughts, anyone?


Alvie
Sonex #102
Jab. 3300A
Ser.No. 174





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