spark plugs for high compression

[baltobernie]

Anybody have a suggestion for plugs on my rebuilt engine? Approximately 10:1 domed Persan model from Vick, unmodified combustion chamber, original deck height. Street use.

On the same subject, what should I gap them at if running Crane XR3000 and Bosch coil?

[mdrburchette]

The regular ole'NGKs should work just fine. I've got mine opened up to around .035 for electronic ignition.

[scampbel98]

I'm curious are you running the 8mm dome pistons from Vick?

[baltobernie]

Yes. (And I'm running N6Y plugs successfully at 0.024" with Pertronix module and Bosch blue coil)

[ace124]

Are you going on what VAS said about your compression ratio? or have you measured it?
As far as i know the 8mm dome pistons in a 2L will go around 11:1 + depending on head used.

[So Cal Mark]

I've got NGK racing plugs in stock and they will work well with hc

[baltobernie]

Are you going on what VAS said about your compression ratio? or have you measured it?

Very difficult to calculate dynamic C/R. You can search this topic here and elsewhere on the Internet.
3,000 miles on new engine. Noticeably faster than a 2L FI in VG stock condition. About even with a well-running 2L w/IDFs. Details in the middle of the "New Head" thread in Performance tab.

[pastaroni34]

NGK B9EGV (Guy Croft recommended)
NGK BR10EIX, newer version, slightly cooler (temp) plug.

I usually use the 2nd choice because I tend to build hot motors. You can probably get away with something in the 6 heat range since you've only bumped up the compression.

There's a great discussion on Guy's site: Fiat Spark Plugs