Hello guys
I'm new here and glad that I can have a community like this full of enthusiasts and informations!

Btw I want to ask you about spark plug gaps

My used S40 2.4i '07 (Engine B5244S4) has stock spark plugs now. I've bought a set of new plugs, NGK ILFR6B, only to find out that my stock spark plug gap is 0.044, which is different from the one I've bought (0.03).

Should it be the problem?
If anything gets different from the stock one, what would it be?

Thanks a lot!
-Jaehan

 

It's no problem. Gap to the plugs specifications. All the iridiums and platinums are showing .028 and the old school copper plugs are .044.

 

Thanks Hudini!
Do you think I can recognize the difference as soon as I drive it out with new plugs?

 

If you do then your old plugs were in really bad shape.

 

I think the gap is the thickness of a credit card (that card passes between the electrode and the pin with some friction). About 0.028". Are you sure the stock plugs are 0.44? That seems pretty high.

What's also important is the head dissipation at the ceramic element. Compare the ceramic element (around the little igniting pin) length that goes down inside the plug, make sure it's the same as the stock plugs.

 

Hey thank you for the contribution!

I've called the dealer and the advisor has given me the info. It's only in my memory so I might be mistaken

I didn't think about igniting pin before! Thank you for telling me! It could be critical, haha .

 

Haha I hope no damage has done to my engine if I happened to feel the difference

 

Sorry, I meant heat dissipation. As for the gap, I tested on my car reducing it and increasing it from the standard value, and the effects on the acceleration are pretty easy to see, it feels like the engine gives hiccups at the smallest acceleration

 

There are many schools of thought on plugs. Every racer has their "secrets" that are probably not secret at all. And I've seen copper plugs gapped all the way to .060 for low compression engines. Generally, the higher the compression the smaller the gap. Some high boost engines are in the .023 range.

Now heat range is a totally different discussion. I would stick to Volvos recommendations unless you add a turbo.