Having googled this topic indepthly and read many threads on many forums I come to the conclusion there is no conclusion.

So in the none too distance future my 3 Door will be having its final mapping on the new BW 7670 EFR I'm running COP and I usually run it on IK31 but they don't last very long and at £40 quite expensive, currently it has some 071's in to bimble around in and they were only £8.
I always have the gap set to 0.8mm

So what's everyone views then? 071's IK27's IK31's or something else, also I wouldn't have a problem spending £100 on a set of plugs if they lasted

Rich

 

IK27 for me. IK31 are fine as long as there are no overly rich sections in the map and it doesn't spend most if it's life cold. They don't like rich mixtures as they are a very cold plug but if allowed to get hot they are fine.

Most problems with iridium plugs come from excessive torquing of the threads and clowns putting copper grease on the threads on installation.

 

With Hillclimbing I tread a fine line with the warming the engine up and not cooking the ACT's.
I'd say it's probably does spend alot of the weekend in cold start.
So IK27's would alleviate this problem or at least reduce it?
Rich

 

The old NGK 9's for me, my set has lasted 10 years

 

I was using ik 31 which fouled up due to just moving car up the drive. So im now using 071. Think mine would b better suited to ik27

I always torque plugs to 30 nm as stated in the bible and i do use a little copper grease.

Whats the alternative to copper grease Stu? I know bmw have some kind of grease stuff they use. Using too much will affect resistance to ground .

Paul

 

I had ik27's in mine

 

I will have to check mine might b ik27 id have to use a lower number for mine if i go back to them.

 

I use 071s but im tight lol

Steve

 

even in your 500 horse engine steve?

 

Yes

Steve

 

Tried all sorts of plugs and the denso range are crap lol bk8ers are better the 9eixs just miss fired to death so im 59c's or 071c and the 59c's are getting a twat to get hold of

 

There's nothing wrong with that James there perfectly ok

 

You not rate the densos then jay I never missed a beat on my ik27's

 

great to know jay ,i get confused with all the different types.

i know of people who have been to tuners ,where the first thing they do is remove the plugs and throw them in the bin for their own choice plug

 

Yeah 071s on mine, touch wood all ok

 

You could have butt plugs in your cars James cus they're never fooking used

 

that hurts pete

 

OOOFFFF Size tens on lol but true

 

He knows i love him Jay






Back on topic for Rich.......

 

Correct gap and cold start and knowing how to keep plugs alive if constant cold starts.

Mark

 

http://www.ngksparkplugs.com/pdf/dyk_5points.pdf

 

Any tips on cleaning iridium plugs? been told allsorts from heating with a blow torch but that can also change the heat range or not???

Paul

 

When they foul bin them. Use the correct grade for your power and look at how your cold start is.

Mark

 

Thought as much. cold start is fine its the operator that's the problem

cheers

 

dont you start aswell jay

 

So should I just lean the cold start right out then?
Rich

 

No you need to warm the very cold plugs up each time you start.
It's easy all that is needed is to hold the revs at about 2.5k for about 20seconds you will hear the plugs clean and come up to temp.
Just constantly starting a cold engine and not doing this will foul plugs.

Mark

 

Good to know that Mark as i never knew that.

 

O71 for me as recommended by The Moan

Steve

 

Cheers Mark good info there.

Rich

 

Ive used NGK Iriduims for years in mine and they have been spot on.

 

Some top tips there.

 

Copper grease on the threads prevents correct heat transfer from the spark plug threads into the cylinder head. This localises the heat in the spark plug and will lead to premature failure.

For initial mapping / mapping during cold starts etc I tend to favour a set of 071Cs - once i'm happy things are 90%+ complete - then drop a set of iridiums in for final power runs and leave them in.

 

This is it if your knocking plugs out its usually bad mapping ! I just find the denso plugs are prone to miss on boost past 2 bar and the price isnt much different to the champion 59c

 

The only thing I am certain of with any engine I use, the will never ever have champions anywhere near them.
Far too much history of them failing, and nothing to do with cold start or local use.

 

Everyone to there own run them in a 620 atw v8 ls1 engine for god knows how long as recommended by the builder never had a issue and run them in cossies fior years with no issue or a 071c but heard of loads of the denso's ends falling out melting ect

 

The most I have run is 3bar and not one miss. It's knowing what gaps to use and what ign system should be used.

Mark

 

Not convinced with what I have found and tried them on w/s and olde age coil with different gaps there a very delicate plug imo wouldnt fit them in a cossie never again but if you trust and like them then thats up to you mark

 

All I know the ford lot are a fickle bunch and like to keep up with fashion I would rather stick to what works for me

 

Mine used to misfire like fook with the champion plugs fitted to mine.It ran shite with the champion plugs in.