AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
The only things to worry about on a spark plug are:
1) Does it fit?
2) Is it the right heat range for the engine?
If you can answer "Yes" to both questions, then that plug will work in your motor.
Any other questions are academic and the different options only present different solutions to a spark plug's problems:
The genooine parts NGK doodah has an iridium or platinum finish. This is extremely hard and is difficult for carbon and deposits to stick to.. so it lasts a long time (60,000 miles allegedly) and operates more optimally than a regular plug which can get sooted up, especially if you do a lot of short journies.
The multi-electrode doodah offers multiple routes for the plug to earth itself (spark) so that it is more likely to be able to fire cleanly under sooty conditions than a regular plug. It'll last longer too since the grief is shared by 4 electrodes, rather than just 1.
The thin electrode (e.g Champion Eon) plugs use a tiny thin electrode to concentrate the spark and provide a measure of self-cleaning (since it gets hotter). The electrode must also be platinum tipped or logic would have it that the beast would burn away pretty quickly.
So.. you pays your money and takes your choice. If you do a lot of short journies I'd suggest Sir wants a platinum tipped plug (NGK Iridium?), or possibly multi-electrodes (Bosch Super-4?) since your biggest issue is going to be getting the plug hot quicky, to burn carbon off it.
On the motorway, go with platinum tipped plugs, or possibly with a thin electrode (Champion Eon) since the plug will get up to temperature and you won't have fouling issues. Instead you'll want it to not wear away as it's firing out a lot more, at higher rpm.
So it depends on what would suit you. A regular boggo- NGK spark plug will do the job but it will wear out quicker than a platinum tipped doodah. If you take your plugs out every 6000 miles and re-gap them or replace them, then this is the plug for you. If you can't remember the last time you took a plug out, be sensible and go with one of the others. NGK Iridiums last 60,000 miles on my '45... Champion Eon last 60,000 on my '55 v6... and Bosch Super-4 have done 36,000 miles in Titch, the Younger Mrs S's Cinquecento (short trips).
No bullets for Chaingun..