Ignition Cables

[Matt Anderson]

The ignition cables that came with my aircraft are in good condition but eight of the twelve cables are too long, some by as much as a foot (may have come off a radial). Is there a place I can get these shortened to the correct lengths?

Thanks

Matt

[admin]

Try Aircraft Ignition Services (AIS) in Dallas (Previously Joe’s Aircraft Ignition). I’m pretty sure they still do harness repair since the original owner died a few years ago, but if they can’t / won’t do it they ought to know who does.

903-378-7205 / aircraftignition@yahoo.com

[Sam Taber]

Hi Matt,  That looks like ones I have seen from Fresno Airmotive .   You may contact them and see if they can rework the long ones.

Hopefully, I am attaching a photo of the O-435-1 harness lead  lengths ( as measured from Ferrule to Ferrule).  I am sorry I did not label which lead is for what cyl. But you should get the idea.   

NOTE: These lead lengths only apply to those fabricated by Fresno Airmotive.  The are measured from Ferrule to ferrule ( nut to nut).  The are not the lead lengths for the original harness with 7mm copper wire and separate radio shielding.  Those lengths are listed in post below and in O-435-1 Service manual.  ST

• This reply was modified 4 years, 5 months ago by Sam Taber.

[Matt Anderson]

Thanks for the information. I will check out both options mentioned.

Matt Anderson

[Matt Anderson]

[Matt Anderson]

[Matt Anderson]

Thanks I will check with both places. For the benefit of the group here is the lengths and installation from the Lycoming manual.

Matt Anderson

 

[Sam Taber]

OK while we are talking Ignition harness, this is is a good time to bring up a magneto connection issue which is quite common.    The Magneto cap has number assigned to each terminal 1 through 6.   These numbers <span style=”text-decoration: underline;”>do not</span> represent the Firing Order or Cylinder number like modern mags.  In the 1940’s these numbers are the firing Event order.    The O-435 Firing order is Cyl# 1 , 4,  5,  2,  3,  6.     The Firing Event is #1 = Cyl #1,  Event #2= Cyl#4,  Event #3 = Cyl#5  and so on… The chart below may help explain.    The confusion or rough running issue, when running a newly install magneto, comes from installing the leads at the mags using firing order instead of Proper Firing EVENT.

[Sam Taber]

Ok while we are on the subject of  ignition harness …..  There is a very important and often confused issue when it comes to connecting ignition leads at the magneto cap on SF6LN-8 mags.    The magneto cap has numbers on all the terminal connection points .Back in the 40’s , those numbers were NOT assigned to the Firing order or the Cylinder number ( like modern mags). Instead, the number were assigned to the firing <span style=”text-decoration: underline;”>event</span> order.      The Firing order on O-435 is  cyl # 1 , 4 , 5 , 2 , 3,  6.   Cylinder number 1 is event #1, Cylinder #4 is event #2, Cyl#5 is event #3 …and so on.   Chart below may help.

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