What plugs are you using?

[Kidders]

What plugs are you using in your M12/M400's? Just noticed a site saying AGSF32's which is quite a hot plug, my 220 uses AGSF22's which is a step colder, just curious really! Have done a lot of recent in this area recently and no longer use Motorcraft plugs because they changed the spec.

[anotherdom]

From the FAQ:

Spark Plugs - Motorcraft AGSF32WM/4 527 158 - 40thou gap
NGK BR7EFS as recommended by Yellowshed gapped to 0.025" or 0.65mm

[Kidders]

32's = NGK 5's (i.e quite hot)
22's = NGK 6's (cooler, same spec as 220)
NGK 7's i would expect to be spot on for most running quite highly tuned, odd that they specced the 32's for standard cars though!

[TuxMan]

Ok the 600bhp cars we run a modified NGK BCR8ES .
Tux

[Kidders]

TuxMan said:

Ok the 600bhp cars we run a modified NGK BCR8ES .
Tux

Is that with a snipped back ground electrode? Autolite (maker of the Motorcraft plug) do a off the shelf plug like that.

http://autolite.com/node/430

[AverageMPH]

NGK BR7EFS set and fitted by Jetstream.

[andygtt]

I believe it's a stock plug machine to fit our head... Never checked the spec as it coped with well over 600bhp and 1.7bar fine for a load of miles lol