I think you'll find most aftermarket ignition systems use a wasted spark
system. The Emags on my O-200 do, as do the Light Speed and EFI ignition
systems.
I just pulled the NGK plugs out of my O-200 last weekend. Took a look at them
and put them back in again. They look like new at 100 hrs in service.
Re: tiny tach. With the Tiny Tachs you have to remember it is an inductive
pick up, so the right hand magnetic rules apply. If you have an aircraft
ignition wire, it's solid wire, so you have to wrap the tiny tach wire around
the ignition wire. The direction of the wrap is important But if you are
using automotive wires, they are spiral wound, so the inductive lead for the
Tiny Tach has to lay in a straight line next to the ignition lead. Wrapping it
with foil to hold it in the correct position will help. It is also sensitive
to the direction you lay the wire. Google "Right Hand Rule for Magnetic
Fields" for more information. I fought this same battle with a Tiny Tach in an
Avid Flyer, then a GlasAir a few years ago. Figured it out once I remembered
my old basic electricity classes from college.
-Jeff Scott
Los Alamos, NM
>
> Yes, I think most motorcycle ignitions use the "wasted spark" system. I
> think I'll call Joe Horvath at Revmaster and ask him about his ignition
> systems just to see if his ignitions use the wasted spark system as well
> . . . just out of curiosity. Revmasters don't use magnetos anymore,
> just dual electronic ignitions. I'm guessing the modern Rotax engines
> and perhaps the UL engines that Dan is considering for his Panther do
> something similar and why not? Magnetos are left-over tractor technology
> and it's amazing when you think about it that aircraft engines are still
> using magnetos . . . sometimes pressurized ones but still, 30-40 thousand
> dollar engines still using magnetos.
>
> That's a good suggestion that the wasted spark system is wearing out my
> airplane plugs, but Ive never noticed any abnormal wear with my
> motorcycle plugs over the years. I'm thinking the electrode wear I'm
> seeing with the Champion 10 mm secondary ignition plugs has something to
> do with the fact these are "racing" plugs. They are probably designed to
> wear faster in return for a hotter spark? I'll look into it. Need to
> get over to the hangar just now and pull some more plugs, check my valve
> adjustment and then head up to VGT Wednesday.
>
> Re the Tiny Tach - Thanks Mark for the remarks on your experience with
> them. This is my second one. The first one that came with the plane
> eventually died after many years. The batteries built in to them are not
> replaceable but they do last a very long time. This is the first anomaly
> I've ever experienced with the Tiny Tach. Yours is the first negative
> report I've ever heard in fact. They've been great 'till this probem
> just cropped up in response to my fiddling with the sensor wire. I'll
> keep fiddling with it and report back.
>
>
>
> 4 Veggies Not to Eat?
> NEVER eat these fruits and veggies (if you want a flat belly)
> http://thirdpartyoffers.juno.com/TGL3141/55638c879c0c6c872945st03vuc
>
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