Why don't we use 18mm spark plugs instead of fooling with spark plug adapters?

[lr172]

Depends on type. Looking at their catalog, bulk resistor wire that's available in blue:

Taylor 8mm Spiro Pro 35672 -> 350 ohms per foot
Taylor 8mm 409 Pro Race Spiral-Wound 36672 -> 3500 ohms per foot
Taylor 8mm High Energy 35652 -> 5000 ohms per foot

Pretty sure I have the spiro "something," but would have to check. I don't remeber it being a high resistance wire, but was many years ago when I made them.

 

[rexbrewer]

I plan on calling Emag and MSD tomorrow to see if I can figure out what components I’d need to order. I find that I really enjoy having all 8 plugs firing!

If I can get part numbers I’ll post them here.

Autolite 386 18mm plugs have worked well for hundreds of hours in my IO360 with dual Emags. These plugs run a bit hot so be careful of of reduced heat margin