Thanks to Lynn French, I definitely know the ignition problem is due to my trigger wheel and sensor assembly. Lynn was kind enough to lend me his parts, while his engine is down, and I bolted it on this afternoon. Lynn has the 7" trigger wheel, while I have the 6". I used my existing sensor and wiring.
The engine fired up just fine, as always. After it warmed up I ran it all the way to 2,320 RPM. I haven't seen the engine turn that fast and smooth in a year and a half. While I was at WOT I switched off the mag and the engine didn't miss a beat.
Here are some photos of Lynn's trigger assembly mounted on my plane. Compare them with my installation in my previous post, dated April 19.
So, without a doubt, the smaller wheel must be causing me to pick up noise from the crank flange and prop bolts.
That's the good news.
Now, I have to figure out what to do about it. My first inclination is to see if I can find a different sensor and use the existing wheel. I have a lot of $$$ in that trigger wheel, and looking at Lynn's parts, I'm sure he even has far more machining than mine. I know a rep for an industrial sensor company and I'll give him a call tomorrow.
Maybe I could use an aluminum plate, with the embedded magnets, like Klaus uses. I would have to know if that type of Hall Effect device would work with the EC3.
Any other ideas?
3 comments:
Hey Sam, what's the additional spacer between the trigger wheel and your prop extension? have you tried the 6" with the extra extension to get the bolt heads away from the trigger wheel.
Paul.
Oh, I've worked it out, the new one is a cup that displaces the triger wheel further aft. I suspect this may have something to do with it. 7" plus the relative distance from the bolts.
Paul.
That's it, exactly!
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