Spark plug gaps.

[Duduglanza]

Anyone knows whats the gap for a ngk iridium heat 7 BKR7EIX? And what gap should i do them for 20psi T4 turbo. thanks

[H_D]

0.9mm

[Duduglanza]

is that the gap i should do or the original gap on the plug?

[maddox710]

is that the gap i should do or the original gap on the plug?

I think they are 0.6mm out the box

[Dean_mc88]

mine are 0.8

[richardc9052]

The largest gap you can go without it being blown out on boost..

[akyakapotter]

Never gapped a plug always taken it out put it in and off you go never had a problem

[Duduglanza]

http://www.ngk.com/product.aspx?zpid=9352

[Eynonz]

Same I just put my Iridiums in the way they came out of the box. Any noticeable benefit of having a wider gap?

[Duduglanza]

I was reading on a ep91 manual that 4efte must have .6mm gapped plugs.. (on a stantard engine). Most of the iridiums plugs have .8mm.

[gorganl2000]

at higher boost levels sometimes 0.5mm has been used to avoid spark blowout

you can try moving from 1.1mm to 0.5mm closing in 0.1mm increments until there is no spark blow out

[AdamB]

Same I just put my Iridiums in the way they came out of the box. Any noticeable benefit of having a wider gap?

Stronger spark, better fuel economy, longer lasting.

[gorganl2000]

i'll also add, i used to buy expensive iridium and platinum plugs

nowadays i buy the cheaper ngk copper plugs of the appropriate grade, i've not noticed any drop in performance or economy

Edited June 29, 2014 by gorganl2000

[AdamB]

Just to add to this, I had a spare set of NGK Iridium's sat in my toolbox and I gapped them today and preset out of the box they were gapped to 0.7mm which is way too tight.

[DevonGT]

i'll also add, i used to buy expensive iridium and platinum plugs

nowadays i buy the cheaper ngk copper plugs of the appropriate grade, i've not noticed any drop in performance or economy

Same here.