[Mk2] [Turbo] Apologies in advance, spark plug Q

[Shmed]

I know the topic has been done to death, but I feel semi unique....

I've decided on copper plugs, but what I'm wondering is, people with over 400 bhp, what plugs do you use, and also, should i be looking for recommendations based on a rev 3 as the only bit of rev 2 I have in the enine bay is the block?

Should I go colder grade?

Part numbers would be good please.

[Steve Horrocks]

Iirc. Bkr6es stock escort RS turbo plugs. Cheap as chips as well.

[mark239]

BCR8ES are escort RS turbo plugs

[Slarty]

6 is the stock grade isn't it? I have 7's in mine so yeah, grade 8's would be more along the lines I guess?

[Shmed]

What's the deciding factor when choosing grade? Is it power or boost, or both, or something else?

[djpkins]

There is a pukka thread on here about this and the woes of having the tip of an iridium plug wing its way through the engine...but I can't remember what it's called....

http://www.imoc.co.uk/forums/viewtopic. ... park+plugs

there we go

[swaggansway]

gts chris will sort ya out! gap em at 7.1 mm to give ya ignition system a easier ride

[Steve Horrocks]

Ahh yeah, 8, that's the badgers!! It's been a while since buying any so numbers were a bit hazy!!! Knew which car they fitted!! Ha!

[Slarty]

gts chris will sort ya out! gap em at 7.1 mm to give ya ignition system a easier ride

I think you might be a decimal place out there.....

[swaggansway]

oops 0.71 mm...lol thanx

[Shmed]

BCR8ES are escort RS turbo plugs

So just to clarify, I should go for the plugs above and gap them at 0.71mm? I take it that 8 is a colder grade than 6? And can anyone answer what defines the use of a colder grade?

Cheers