Ian Beadle wrote:

The attached picture may be of interest to the group. I did an early 200 hourly as a DI showed
problems with the vacuum pump bracket.
As you can see the NGK B9EV & B10EV spark plugs did not have much life left, one B10 and one B9
having no center electrode. She still ran as smooth as ever. The trailing plugs were changed to
B10 (cooler) at 100 hrs, at which time they all looked like new. A check at 150 hrs showed all
well. Then I started using Avgas with a few fills of unleaded mixed in.
It would appear that Avgas is hard on plugs!
I have now fitted B9EVX (leading) and B10EVX (trailing) These are platinum plugs. EV's are gold
iridium. The platinum plugs have a cone shaped center electrode as against the gold iridium's thin
wire.

Ian Rotary RV6A Australia.

And you were flying over the outback? :)
Looks like they are too hot Ian. Try the next colder version.

Paul Lamar
 
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