What spark plugs are best for 400bhp on WS, currently using 071's but I thought I saw something about them being a lower spec now.

 

MSD recommended Denso Iridium plugs. Give them a call and they will be able to sell you the correct ones for your set-up.

 

I had no issues with 071s runngin 400bhp mate.

Just make sure the rest of the ignition system is in good order

 

must be a load of faulty 071s being sold,bought a set from matt lewis,2 wouldnt work at all,got another set from ford dealer again only 2 would work,if i put the 4 good 071 runs great, new set of ngk iridiums work no problem

 

I just put a set of 071's in mine and one of them didn't work

 

Had the same issue - bought a set of 4 and one was dead, put an old one back in and ran fine. Ended up just cleaning the old set and sticking with those!

 

ran denso s for years and never had a problem,
changed to 071 s and they didnt even last the summer, fucked already,
a mate of mine had problems with 071 s as well
I ll prob go back to the denso s again now

 

used both. densos are better on a coilpack 071's on std ignition.

Saying that short runs and moving car around will foul up denso plugs quicker.

Paul

 

That's what I thought I heard about the 071's ford changed manufacture or something and there are loads of problems with them.

 

I had the same, a single faulty 071 plug out of a set of 4

 

I have never had any problems with Denso Iridium plugs and wasted spark ignition.

 

A faulty 071 cost me my first race of the season, put 4 new plugs in after qually then on the green flag lap I came on boost for the first time and it would barely run!
pulled off after half a lap, hurts when it costs 300 quid and you do half a lap!
got loads more 071's and did a test day swapping them around till I got a few good known working sets


steve

 

We gave up selling 071s. Too many dead ones out of the box. Stick with Denso Iridium.

 

Why don't you just buy plugs that work

Mark

 

Because i'd never had an issue with them previously and had several sets in stock, I completed the rest of the season without having to take them out again.
For next season I will move to a different plug yes


steve

 

Iv just had 2 densos give up after 200 miles and a set of 071's started missing after 300 miles! Got a combination of the 2 now just to get the car running on 4 cylinders.

 

I have had the same set of Denso Iridium plugs in my car for the last 18 months with no problems at all. I cant understand why you have had 2 fail in such a short distance. I have got wasted spark ignition, maybe that helps?

 

You clearly have a problem that you need sorting before you kill your engine.

Mark

 

Maybe there is a problem that is causing them to break down then. Have u got any ideas what it could be? The car is on a low boost base map to run it in and is not ragged everywhere just a quick blast now and again.

 

Do you have a afr gauge in the car and is it live on start up.

Mark

 

No afr gauge at the moment but going to fit one before its mapped didn't think I would need one just running it in.

 

The question is are you bore washing it now.
Check cranking and first start fueling.

Mark

 

I must be the only person that has used 071's with no problems

 

Ok thanks for advice iv dropped the oil recently and it was fine no sign of any fuel contamination, il go through it all again see what I find.

 

Mine have been ok running for the last 12-18 months, just wanted to change during a winter service.


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