Andrew,
This is an old post that my help. More in the archives. – This was with my EC2 and SL-30. I have since removed the SL-30 and have an EC3. I still have a very small but detectible engine change on the B Controller when transmitting with my Garmin 430W. Depending on your EC2 age and upgrades you may not have the capacitors on the MP sensors.
Any chance it's an SL30? My SL30 wired to a Bob Archer wing tip antenna would almost kill the engine when transmitting. My 430 wired to a belly antenna worked fine. Tracy added capacitors to both the A&B controller MP sensors. The capacitors eliminated over 90% of the interference but a little is still there. I have the SL30 removed from the plane for now. Garmin has issued a service bulletin that may be related. Need to send mine in.
Bobby Hughes
RV-10
Super Charged Renesis
295 Hours
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com
Sent: Saturday, October 24, 2009 10:47 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Sam Hodges Update
Here is an update on Sam's RV-7A progress with 13B...
"I believe I bucked my last rivet last night on the forward upper deck. The plane will be heading to the airport in a couple weeks but will be making a detour to the paint shop on the way. You will like this, when I completed the wiring I ran the engine one more time to verify the newly completed system. To my amazement everything worked, even the interior lights, until I hit the PTT to see if I could pick anybody up. When I pushed the PTT the engine would almost quite and the EM2 would start to scramble, even the FM radio on the garage wall would quite. After a calls to the Gulf Coast Avionics techs is was soon apparent that they led me on a trouble shooting trip that led to nowhere. After a weeks vacation from work and the plane I came home with a fresh mind and discovered a direct short to ground from the coax center conductor to the radio case. A bad radio right out of the box".
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Saturday, July 23, 2016 6:12 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: rebuild
Turns out I rebuilt an engine for no reason other than for the experience. seems no damage from my problems on first flight. decided to replace all the soft parts but as I live just a bit West of most on this forum, it makes it a bit hard to get parts, even Mazda could not deliver orings without 3 week delay so I just bought some viton cord for the coolant rings and made my own. they seem to be holding up Ok for now.
When I reinstalled the engine, filled it up with coolant and pressure tested, it leaked like a bastard past a hose clamp on the rear iron. The fitting is usually used for cabin heat in the car but I got it blocked off and didn't touch it during the rebuild, so now I'm pretty sure this is where the coolant leaked from on that first flight.
Have now installed a fence in the ducting to separate oil and coolant radiators and opened up the air intake about 50% bigger to try and get more air in. Its the dead of winter here, so daily temps are about 20c , doesn't get much colder only hotter as summer approaches so I need to get this thing flying soon to be able to take advantage of the cool temps.
Took it out onto the main rwy for a fast taxi run, its a long long taxi to get to the threshold so temps rise and hopes drop, but on the rwy temps are 140 coolant 180 oil at 70kts. so confidant I can probably stabilize the temps in flight now.
But I tell yer, if I ever catch that bloody Murphy bloke, I'll make him squeal. for some reason now everytime I transmit on the radio the engine runs crook, let go of the ptt and all good again, and the fast run down the paddock done something to one of my wheels as there was a horrible noise from down there on the taxi back to the shed. so I got things to sort out first tomorrow.
Andrew