SonexBuilders.net

My personal belief, from the beginning, is that the trigger is bad. Had a similar incident on my Aerovee Sonex many years ago ...

FWIW,

Dale
3.0 Corvair/Tailwheel

Hi George,

If you can manually fire two plugs but not the other two it seems it must be the secondary module.

The only other thing I can think of is checking the grounds.

From AeroVee manual:

Note: A ground wire must be installed under one
screw of each Trigger and routed to a ground point
on the engine or airframe.

Good Luck,

Wes

Are both of your triggers the same distance from the magnet? Mine were not from the factory and I had a measurable difference in timing between the two. .

My secondary ignition draws 10 amps, but only if the engine is rotating. If the engine is not running and I turn on the secondary ignition there is a 10 amp spike then nothing. My engine serial number is about 850 or so. Hope this helps.

Ordered two new triggers today as per Sonex advise. I'll let you know how it goes... George

Hi Bill,

bvolcko38 wrote:My secondary ignition draws 10 amps, but only if the engine is rotating. If the engine is not running and I turn on the secondary ignition there is a 10 amp spike then nothing. My engine serial number is about 850 or so. Hope this helps.

So does that mean that you can't hand prop the engine with the secondary anymore? I think hand starting with only the primary on an AeroVee would be frustrating. Do you know how long after the engine stops rotating until the ignition module powers down?

Thanks,

Wes

I never tried to hand prop!
My assumption is that if there are no signals coming from the trigger, then there is no current flow through the coils.

Hi all. When I removed my old and "hopefully" defective triggers, I noticed a white paste spread on the backs of them where they contact the stator plate. I asked Sonex what this was, and they said it was heat sink paste. They suggested that, or dielectric grease should be used. Any experience with heat sink compound? Some sites online say diaper rash cream with Zinc Oxide can be used, but not sure how permanent that would be. Thx ! George.

Diaper paste cream other than being the same color is not the same as heat sink paste. The correct stuff is less than $10 on Amazon. It’s not worth the few dollar savings to use the wrong material.

I've used heat sink compound with heat sinks before. Including stuff from my job, computer stuff, and when I built my LED landing light mounts/heat sinks I used it there. Easy to find on Amazon.
https://www.amazon.com/gp/aw/d/B07KQ1T158

I'd go with heat sink compound.