Leadership Team Shortshift Posted May 12, 2020 Leadership Team Share Posted May 12, 2020 Until now I have used conventional NGK BR7EFS plugs in my Duratec R500 but around two years ago I bought (but didn't fit) a set of NGK's iridium plugs, based on a recommendation from someone (and I can't remember who!). The new iridium plugs are type BR7EIX. Any comments on guidance on the Iridium plugs for this application? I'd feel happier if, before fitting them, I could recall who recommended them as the correct type for this engine but hopefully there will some appropriate wisdom here to help me out. Basically, should I or shouldn't I?James Link to comment Share on other sites More sharing options...
7 wonders of the world Posted May 12, 2020 Share Posted May 12, 2020 Aside from being roughly 3 times the price of normal NGK's, they offer a stronger spark but more important is make your you have the correct gap, most of these come gapped for tin tops many at 1.3mm - too wide for yours.There's nothing at all wrong with the stock NGK though. Link to comment Share on other sites More sharing options...
elie boone Posted May 13, 2020 Share Posted May 13, 2020 I gap the plugs at 0,9mm, works just fine. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted May 13, 2020 Share Posted May 13, 2020 Depends on your engine spec Elie, static and dynamic CR cams etc all have a bearing on cylinder pressure. Link to comment Share on other sites More sharing options...
Leadership Team Shortshift Posted May 13, 2020 Author Leadership Team Share Posted May 13, 2020 With the 'standard' BR7EFS plugs I run them at around 0.95mm.So if the view is that the Iridium plugs are fine to try (no-one is saying "don't do it"), should I stay with the same gap?James Link to comment Share on other sites More sharing options...
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