Spark Plugs

[Horace Blok]

I never knew there was so much to learn about a spark plug.

I have both aviation and automotive plugs in my Superior XP motor.

Having read Vans Air Force threads on spark plugs, there are all kinds of opinions. I wonder whether we are spoilt for choice like aviators in the US wrt options with NGK, Denso, Champion etc?

Who here in SA has replaced their Autolite 386 plugs and which equivalent replacement did you go for?

I have been to the cross reference charts and wonder what heat range plugs I should go for? The Autolites heat range is 4 and a resistor type plug (18mm). The NGK plug has a heat range of 6 or 7 and isn’t the resistor type. I am prepared to learn listen et cetera. Who has replaced and with what? ( I do want resistor type plugs - to counter interference on the radios).

[Horace Blok]

Some feedback: Giles Palmer at NGK is very helpful 0861 835 645.

There are no resistor type equivalents to the Autolite 386.
NGK equivalent is the AB-6.
One gets resistor caps 5 or 10 KΩ. to compensate for their equivalent plug.

I had feedback from Champion - they have to import the plug. Their equivalent is part number CCH541.

[Jan]

Horace do you a magneto as well as an electronic ignition like the Plasma?

Most here is using the NGK BR8ES

[Horace Blok]

Jan - I don't have the adapters - I use 18mm thread plugs - your suggestion is a 14mm thread.

I found this PiperFlyer.org pamphlet about spark plug maintenance fascinating and very educational.