Spark plugs

[David Wilkinson]

So now I have some time I will give a bit more info on my first scooby. It has done 81000 miles, fsh, it is getting a major service. The mechanic doing the service was in touch with a friend who worked with the Subaru rally team. He recommended 4 point spark plugs. I've asked him to get them. Has anyone else used these? Just curious.

Thanks

[kayzarh]

Pretty much everyone here uses NGK plugs here if I'm correct, I personally use pfr6b's for my classic ej20, I think the ej25's use pfr7b's

Are they the best? I dunno. Do they work? Yup. Are they well priced? Yup.

Sent from my HTC One_M8 using Tapatalk

[quit]

Pfr6b is standard spec from Subaru 

 

if modded use the 7b 

[savage bulldogs]

As matt said most that run extra boost use ngk 7's and make sure they're compatible with your engine size .As the 2.5 heads run a different length plug than the 2ltr heads.

My personal opinion of the "multi point" spark plugs is that they're a bit of a gimmick, although I've got no data to back up my opinion. Basic electrical behaviour is the spark will "jump" across the smallest gap between "prong" and "core" . Therfore only ever "sparking" at 1 point not all 4 at once ?

If it's not broke .....upgrade it 😊

[David Wilkinson]

Thanks Guys.

Being a newbie to an Impreza I'm trying to soak up as much info as possible. So running a standard form EJ20 there is not much to be gained with the multi point spark plug?