7B spark plugs

i have a brand new set of 4, 7B spark plugs that i never had the time to replace in my blobeye before breaking.
quick question..... im not sure if there ment for my 2.5 hawkeye sti, am i right ?,
if so what equivelant can i put in.

the PFR7B are for the 1993-2005 cars, unfortunately the hawkeye uses a more expensive plug.

As standard they have ILFR6B fitted but for the same price you can get the ILFR7H, these are the higher heat range plug.

i love the way you say " more expensive " cheers.

the hawkeye plugs are around £60 a set

Jonny Gav wrote:

the hawkeye plugs are around £60 a set

yip there are thats why i only keep 1-2 sets in

what do you recon on these jonny / drew ??
http://www.jp4mance.co.uk/products/1/Subaru/_/2709/

no good them plugs for urs, would need map altering

Martin, get them before andy carr comes happy days

happy days i wouldnt use them plugs for road use, standard fuel

Why is this Andy? interesting information your providing I like knowing stuff like this

j555hks wrote:

what do you recon on these jonny / drew ??
http://www.jp4mance.co.uk/products/1/Subaru/_/2709/

pmsl thats per plug (£32.-- each) ya can prob get a set of racing 8's for that

I tried the iridium IX in my blue classic and it ran like a pig when cold, went back to PFR7B and all was well.

Never tried them in the hawk.

I thought that price was for 4
So for mine fast road nodded to 340/370 what , were and how much.
Cheers.

ILFR7H at £60 a set

What difference would it make if you had 7b's in a hawkeye??

The PFR is a shorter plug than the ILFR so the electrode will sit inside the head when fully tight, not ideal for combustion lol

Lee's car has the 7b's in and it was mapped wiv them in! If we change then to the right ones would this cause any problems??

No not at all, if anything it will improve things, is lee's a hawkeye 2.5 not a 2.5 with 2.0 heads???

Here are the plug differences (ILFR7H left and PFR7B right-

As far as I know they are 2.5 heads! It does take along time to start when warm and cuts out now and again so chances are this is the problem lol wat should the compression b on it? as I myt do a compression test while I've got the plugs out!

You need to be absolutely sure they are 2.5 heads or the ILFR7H plug will make contact with the piston!!!

Compression should be 150psi, + or - 10psi

Well it started life as a 2.5 but that means fuckall lol what's the easiest way to tell?

Measure the thread depth i guess, how to do it is another question, by looking at the plugs it looks like the ILFR's are a good 20mm longer so you could use a scope, if you have the wrong plugs it there should be 20mm of carboned up thread at the bottom?

Any one else got an idea???

Thinking about it aren't the 2.5 heads stamped up with 25???

Nowt easy then! I'll hav daves car tomoro so I'll have to compare them c if I can see a diffence between them
Cheers jonny great advice asways!

yip 2.5 heads will have sumit like rhh25 or rhv25

2ltr have rhh20 or RH20v sumit like that but i have seen 2.5 heads on 2ltrs lol and original subaru built cars but the combustion chambers havnt been machine out like the 2.5's