Spark plugs again

[Johan G]

I'm planning to replace the spark plugs on my S3C (2.9 litre engine). I would like to fit NGK plugs, but I don't know the exact type. So I thought I'd better ask you guys.

Cheers
Johan

[Johan G]

Oh, sorry, I have looked at that list before. Must have missed the NGK plug stated there. Thanks.
It seems like they recommend the type stated there for sprinting. Maybe they will be too cold for more ordinary use? Has anyone tried them?

Johan

[Johan G]

Thanks Peter!

After doing some research and checking what type of Bosch plugs that are currently fitted to my S3C, I have decided to go for plugs with tapered seat.

Some research yesterday resulted in the following list of spark plugs with tapered seat:
Bosch HR9DCX (currently on my S3C)
NGK BPR6EFS (like BCPR6ES but with tapered seat instead of gasket)
Motorcraft AGRF32C1
NGK TR5 (like BPR6EFS but with V-grooved center electrode)

Sources:
[url]www.ngk.co.uk[/url]
[url]www.ngk.com[/url]
[url]www.ngk.se[/url] (in swedish)
[url]www.sparkplugs.com[/url]

I still feel a bit unsure about choosing plugs with tapered seat, but since that type has worked fine on my car before I think I'll stick to them. It seems like they can be a bit difficult to remove though. The Bosch plug I removed yesterday almost felt stuck to begin with, but finally came loose. A local Ford dealer recommended to put some copper paste on the threads when mounting the spark plug to have less trouble removing it. I hope this may be of some help.

Cheers
Johan

[Johan G]

Yes, that is exactly what I have found out too. So as spark plugs with tapered seats have been used previously on my car, I will continue to use that type.

Edited to say:
Is there any other way to know what type of cylinder head you have on your car? Like some kind of marking or number? Does anyone know?

Johan



>> Edited by Johan G on Wednesday 14th April 13:22

[Johan G]

Maybe this is not a big issue at all? Seems like both types will work.
I replaced spark plugs (except the front right one which will require a modified socket), rotor and distributor cap last night. And now she runs like a dream! And they say the weather will be nice here this weekend. Can't wait for some driving in the sun!

[Johan G]

Allright, allright, I'll take a closer look when I replace the last spark plug. I'm not an expert so to me it will probably still not be obvious. I'll see if I can get a close-up picture taken.

Johan

[Johan G]

Here is a picture of the front right spark plug hole of my S3C. To me it seems to be machined for tapered plugs where the arrow points in the picture.


Johan

[Johan G]

I understand that completely. I wanted to be sure about what was right for my car, since it is the first time I'm replacing the plugs. Thanks for making me look into it really thoroughly.

Cheers,
Johan