For a friend.

His rally car keeps burning spark plugs out, sometimes two sets in a days rallying sometimes not at all. It the porcelain bit that burns not the spark tip.

He's been using NGK TR5a/10 as thats what parts place said would be best.

Car is a Mk3 fiesta with 1.6engine but 2.0 head apparently.

What plugs would be better to try? I thought some with higher temp range unless theres too much power coming to plug which is burning it out?

Never heard of that though