I use the NGK B9EGV plugs in my
20B. I decided to pull a pair out for a look after 45 hours. They
seem pretty good, but perhaps not as good as I expected since I’ve used
nothing but 87 unleaded mogas. They give quick starts, good performance,
and are quite forgiving of flooded conditions. I was surprised to see a
bit of electrode erosion, but I guess racing plugs with strong spark aren’t
expected to last like the Champions in my car. The trailing is on the left in
the photo, and has an interesting ‘shadow’ going off to the
right.
I just though I’d post the photo
for anyone’s comment as this is my first experience with these plugs in this
engine for this many hours. Some deposits on the leading - should I
maybe consider a step toward a higher heat range?
Happy
Holidays!
Al