Steve was using 10mm long-reach Champion G59C plugs for the secondary ignition when I got my plane from him. I've done a lot of research on plugs - both for the secondary system and for the mag - back when I was going through the engine and systems completely - and decided to stick with the G59C plugs because they are a bit on the cold side and are non-resistor plugs. Adding resistor plugs to resistor leads, perhaps with resistor spark plug caps, is way over-burdening the coils. To prevent RF interference one should use resistor leads or resistor plugs, but not both. Or you can do it and reduce the efficiency and life of the coils.
I've recently revisted this subject while researching new leads for my Dyna coils that came with my engine from Steve Bennett. My current leads that came with the plane are red 8mm Taylor leads that look and test fine but I'm going to put new leads on anyway once I decide which ones I want. I wrote Great Plains about availability of theirs and to see what they are selling, also to order a new mag puck. So far no response but it was only a couple days ago that I wrote. I miss being able to call Linda or Steve. They always answered the phone. I think my coils are getting a little weak with time so putting some new leads ought to help. The miss I've been experiencing with the secondary system on the right rear cylinder was corrected by reducing the gap on the plug - which means my coils are getting weak, or the leads are arcing since they also have some years on them. I'm reading the insulation breaks down over time . . . but that doesn't seem to happen with car leads or my bike leads and they get a lot more use . . . so I don't know. Putting some new 10 mm Taylor leads on can't hurt. Waiting to hear what GP is selling for their secondary systems these days. I've been reading some performance forums lately (motorcycle primarily) and apparently NGK and especially Bosch are considered to be junk by the guys whose lives revolve around these subjects. They seen to generally love ND - Nissan Denso, which is what I chose for my magneto plugs a long time ago based on research I did then. W27ES-V fine wire plugs. Took a bit of looking to find them. They've been great and so have the Champion G59C plugs on the secondary. The miss on the one cylinder lately is not the fault of the plug. Mike KSEE ____________________________________________________________ Old School Yearbook Pics View Class Yearbooks Online Free. Search by School & Year. Look Now! http://thirdpartyoffers.juno.com/TGL3141/557f1054af9c510540fbest03vuc
