[p40fan]

I am having a problem with rf interference on just the lower wing ailerons. The rest of the control surfaces seem solid. The A/C is a Great Planes Ultimate Bipe.
The engine runs great and starts easy and throttles up smooth.
Here is what I have worked through so far:
-Shortened all leads.
-new spark plug Champion RCJ6Y as recommended.
-new Hitech 645 mg servos in bottom wing.
-Tightened ground wire to engine frame mount.
-mounted EIS in double foam to lessen vibration.
-disconnected the opto isolator and ran it without it. Didn't help.
-Moved all components to just behing the firewall. Rx is about 10 inches away.Didn't help
There is no metallic insulation on the plug cap or the plug wire on the Fuji module.

I can seem to reduce and sometimes eliminate the interference by pressing on the pickup wires where they enter the EI Module. Does not appear to be any broken wires at that point but I suspect there is a problem somewhere at that point. The module is a sealed unit and does not appear to be serviceable.
What Ignition module would work on this engine. Talked to Paragon rep and he didn't seem to think any they have would work with the Champion plug.
Anyone have any suggestions.

[volksman]

I had an issue with a bi plane a few yes ago. A price of ALU.in um covering the fire wall was the fix. Never really found out what was the actual cause. I swapped out everything but the aluminum cured.

[grizak]

From our experience, the FUJI electronic ignition modules really seem to suffer from RFI problems - we have had many customers with the exact same problem as you - "unexplained" Radio Interference and glitching when running these engines/ignitions.

Really the only true fix is to replace the ignition with another brand - something like an RCEXL - I'm pretty sure the RCJ6Y has a 19mm (or 3/4") hex size (check by measuring it) - so you could use this ignition: http://www.thunderboltrc.com/index.p...oducts_id=1617

But you'll need to re-time the engine (to fire at around 28-30 degrees BTDC) and figure out a way to mount an RCEXL sensor on the engine - you should be able to get something to work with this sensor: http://www.thunderboltrc.com/index.p...oducts_id=1251

You may be able to move some of your electronics around or try to insulate or protect the electronics from the RFI -but there is no guarantee that the changes you make are a permanent fix - RFI is tricky, and in our experience you are best to remove any component that is creating RFI - as it could change or increase at any time.

[MikeCam]

http://www.rcextremepower.net/FujiIgnitions.html