Iridium Spark Plugs???

[roseytvr]

When I serviced the Griff last year I replaced like for like the B7ECS spark plugs which were originally fitted by the engine builder. Gone to replace them today and out come NGK Iridium BKR7EIX. WTF? The car did go back to the engine builder last year but he didn't charge me for new plugs and didn't tell me he had fitted them?

Any ideas on the benefit of these over the B7ECS plugs and why he would change plugs that were 8 weeks old when he had it? Not exactly on best terms with him at the moment so don't particularly want to ring and ask but I am curious as to why the swap and what I should put in it now, particularly as I have a new set of B7ECS ready to fit.

Thanks
Ian

[Toltec]

Assuming they are an equivalent fitment then main advantage is that the iridium plugs should last a lot longer.

Take a few out and check the electrode, a quick google should bring up a picture of how they should look, if they are not worn out put them back.

[blitzracing]

Chimpongas loves the Iradium spark plugs, and has spent some time telling us all why, although a rolling road test did not show any actual improvement in BHP terms between them and stock new bog standard NGK BP6ES, but hes was sure the engine the idle and low speed running was smoother.

[Pupp]

I think the clue is probably in the 'R' in the designation - the iridiums you have are resistive, the B7ECS standard fitment are not. The 7ECS cannot be got in a resistive variant so if you need a resistive plug due to ECU interference (say), then it's either a different grade of plug or a different type (for example I use BR8ECS).

[roseytvr]

Thanks guys,. the car went back with a suspected interference problem which as Gary says explains the change. The car has only done 300 miles since then so I will leave them in and see how they go. I have read the early thread blitz refers to ....... Oh dear! Lol
Cheers

[QBee]

1. I have Iridium 6 plugs - car runs better, more responsive,
2. Resistive plugs are important to avoid damaging coil packs, I understand - Blitz, tell me I am wrong
3. I think 2 because I saw a race car having serious running problems at Rockingham 10 days ago in the DTEC. stopping and starting during race 1.
I noticed that every time he went past the announcer his car interfered with the Tannoy. When theny were all standing around the car commiserating, I mentioned this to Mat Smith, who quickly whipped a plug out of Tim Davis' car and said, " you need resistive plugs, your coil packs are probably knackered by running non-resistive plugs"..

[N7GTX]

Iridium plugs will easily last 40,000 miles with no problems. Most car manufacturers recommend a life of at least 40,000 and some 60,000 miles.

[GTRene]

some even 100.000 miles...

said:

Long-life platinum and iridium spark plugs will typically last up to 100,000 miles or longer provided the engine isn't using oil or doesn't spend a lot of time idling.

http://www.counterman.com/long-life-spark-plugs-can-last-100-000-miles-or-longer/

In my car (Hartge V8) I had NGK BKR6EQUP Platinum High Power, they were good for 100.000-km (62.150-miles)
but I changed them (still in a very good state after all those years) after just 30.000-km (18.645-miles), I don't drive that much.

replaced them with some iridium examples, autolite xp extreme performance, not that I notice much difference, but it runs very well and I wanted to refresh things on my car
also changed the 8 coil-plugs etc and oil and filters and a chain tensioner and and and

On the first drive out, and when I came into a underground parking place, I thought, hey...I lost most/all of the lovely sounding pops and bangs when I go of the throttle...hm, could it be those new type plugs?
but no, then I remembered that the plastic intake-tube which sits after the MAF and goes onto the intake manifold,
was not good on the intake manifold anymore, so it sucked some false air I guess explaining those pops and bangs, but its better this way