sparky300

I am going to attempt to change my spark plugs at the weekend and was wondering which plugs I should purchase for the job.

Doing research online there are soooo many different types of plugs, copper, iridium etc, all claiming to be better then the other.

So my question is, which would best suit my needs,

1) I want a high performance plug
2) I don’t want to have to manual gap anything (ill just get it wrong)
3) I plan to change them every 3000 miles, so don’t require long life

many thanks

SirFozzalot

I had Denso Iridium plugs fitted in mine.

sparky300

are Iridium plugs better?

Bubba po

Get platinum ones, NGK are recommended by Subaru - PFR 6B on my classic. They last for four service intervals EASILY, which is a bonus because they're not in the most easily accessible place.

JohnD

iTrader: (5)

Changing them at 3k seems a bit of a waste! Modern plugs will last and maintain their performance for much longer than that.
When you say "performance plug" what do you really mean: a colder plug that is more suitable for a modified engine? If your engine is pretty standard, then the standard fit NGK PFR6b will do fine. (platinum) and will go 5-6 times the miles you quote. Iridiums are a good alternative and are also long life, eg Denso VK20
JohnD

Bubba po

Apologies, Yes, PFR6Bs are platinum.

Alan MaC

Irridium are Cannies gentilia.

Better pick up, more responsive, more MGPG (if you don;t use the extra woomf!)

Alan MaC

sparky300

thanks peps,

JohnD, apart from a few mods (full exhaust system and de-cat) my engine is standard really, just wanted to put the right sort in for my needs.

Not sure if there is any advantage in terms of performance, but if one gives better car responsiveness over the other, then thats the one I would go for.

3000 miles is over kill yes , I have been doing the oil at that interval and someone recommend I did the same with plugs.

My last car was a imported MR2 turbo and that was very well looked after (keeping in mind my low car knowledge) I want to carry on the way I started with this car.

The stated NGK PFR6b looks fine, but as also posted does Irridium ones really give the better responsiveness?

miff13

Sorry to hijack this thread, I know next to nothing about engines but surely a spark plug just supplies the spark that ignites the fuel, don't see how a different plug can give you better pick up, be more responsive or give you better MPG

B0DSKI

iTrader: (17)

Denso Iridium on mine too

Alan MaC

Miff, all I can say is try them.
The chap that services my Scoob, sponsors and runs a Rally going Scoob.
He's really switched on & got me to try them definitely a improvement.

Some of his customers are runing their Scoobs at over 400 brake.

REgards

Alan MaC

JohnD

iTrader: (5)

The claimed advantages of iridium are that due to the very small diameter iridium centre electrode (0.6mm on NGK and 0.4mm on Denso) less voltage is required to produce a good spark across a given gap. The intensity of the spark should therefore be higher. Iridium is also extremely hard, resilient and corrosion resistant, so the plugs are considered long life.
Opie Oils sell Denso: take a look
JohnD Opie Oils

AndyMoody

iTrader: (2)

Have a look at Sparkplugs UK - Champion, Denso, Beru and NGK sparkplug suppliers

I emailed them asking about new plugs for my WRX 2003 as it is due for a service in May, here is the reply:

I would imagine NGK PFR6B would be OEM part. Service life will depend on how the car is driven, fuel etc but I would expect 30 - 60K miles. IK20 would not be a good choice due to the over large preset gap, VK20Y would be the best Denso Iridium option for performance and service life.


Andy.