http://www.twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=872173

LOL!! heated discussion anyone!? :D

Me incite a heated discussion :slap:

Me incite a heated discussion :slap:

 

with your reputation! :D

who here uses them plugs then?

I've got some Greddy plugs on their

way to me, i'll let you know what i find.

Surely these plugs are designed for

specific cars? :confused:

Hi All,

 

Hopefully I've attached an image of the four most commonly used Z plugs. It's not perfectly square, think the camera was on an angle. You can see though that the 'spark position' is the same for PFR6B-11C and Iridium BKR6EIX-11 and IK20. The big difference is the shell extension which the PFR6B-11C has and the others do not.

 

From left to right: PFR6B-11 (NA), PFR6B-11C (TT recommended), BKR6EIX-11 and IK20.

 

I think the US link and photos refer to PFB6B-11B judging by the even further extended shell.

 

You may have no choice but an aftermarket plug if mods mean you need a colder heat range.

 

Sideshowbob - Not sure who makes Greddy plugs, bound to be NGK or Denso though. Not car specific at all, make sure they're the same length as the ones you take out as retailers have a nasty habit of supplying JIS plugs where they should be ISO and vice versa, this is important with direct fire ignition.

 

Cheers!

 

RobH

mmm, not this old chestnut again!!

I use some I bought from a lawnmower repair shop, they were dead cheap, cos they were out of old lawnmowers! Seem to work fine.

mmm, not this old chestnut again!!

 

chestnuts are no good as plugs - very poor conductors of electricity you see :slap:

Rob,

 

Why is the 11c (Turbo one) longer than the 11 (n/a)

 

John

You may have no choice but an aftermarket plug if mods mean you need a colder heat range.

 

 

A lot of the guys in the US use the 6B-11b up to and above 500bhp with no probs!

Pretty sure NGK make Greddy & Blitz Plugs.

Hmm..maybe so, but I'm pretty sure NGK aren't making the 11B anymore. Maybe the 500BHP blokes would see an improvement with a colder plug. 1 heat range per approx 100BHP upgrade is the general rule of thumb most tuners work to I believe.

 

John, the shell is usually extended to offer some protection to the firing tip, wear being more rapid in a turbo engine. Not sure if the NA/TT use different heads - anyone??

 

R

 

A lot of the guys in the US use the 6B-11b up to and above 500bhp with no probs!

Rob,

 

Why is the 11c (Turbo one) longer than the 11 (n/a)

 

John

 

 

The theory is that the chamber is more turbulent because of the turbos forcing more air into the cylinders!

 

The plug needs to be longer, so that the burn can start in a more central place in the chamber, allowing a correct burn!

Rob I think they go for the simliar length copper plug, which is available in a 7 heat range, but they report no probs with the 6B-11B!

 

The 6b's are still available, http://www.courtesyparts.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=22401-000026

 

I would get them from Coz at CZP, he has cheaper shipping charges and he has greater knowledge of the Zed !

I guess that would be the ZFR7F-11 that John Dixon uses. The point of my photos earlier was to illustrate that the UK Z32 recommended plugs (PFR6B-11C) are actually the same length as the aftermarket 'upgrade' plugs so the spark is actually in the same position, therefore there is no major disadvantage in replacing UK standard plugs for Iridium plugs. PFR6B-11B are a different prospect with quite a different spark position. Can't think why NGK UK are pushing the 11C instead....

 

 

 

 

Rob I think they go for the simliar length copper plug, which is available in a 7 heat range, but they report no probs with the 6B-11B!

 

The 6b's are still available, http://www.courtesyparts.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=22401-000026

 

I would get them from Coz at CZP, he has cheaper shipping charges and he has greater knowledge of the Zed !

I guess that would be the ZFR7F-11 that John Dixon uses. The point of my photos earlier was to illustrate that the UK Z32 recommended plugs (PFR6B-11C) are actually the same length as the aftermarket 'upgrade' plugs so the spark is actually in the same position, therefore there is no major disadvantage in replacing UK standard plugs for Iridium plugs. PFR6B-11B are a different prospect with quite a different spark position. Can't think why NGK UK are pushing the 11C instead....

 

11Cs are what the manual recommends. I don't know where the merkins get the 11B idea.

The 6B is only sold as far as I know in the US, when I spoke to NGK they said it was not available in the UK, so that is probably why they are pushing the 6C!

 

 

By the way Cosmik 6B is the plug NGK produced when they were asked to by Nissan to make a plug for a Zed with uprated boost!

HKS plugs for me everytime:D:D;)

What do you all think of the Denso Iridium's?

 

As i've just bought some......... :)

 

 

Rich

What do you all think of the Denso Iridium's?

 

As i've just bought some......... :)

 

 

Rich

 

The same as the HKS AWESOME;)

Thank fook for that.............. :rofl: :rofl:

 

BTW sorry for hi-jacking the thread.

 

Rich :)

I broke my Denso's, they started to leak. LOL

I broke my Denso's, they started to leak. LOL

 

Trust you :rolleyes: you also broke your alloy intercoolers :rofl:

I've had Iridiums in mine for about a month and no probs so far (please God). Not sure what make tho.

Yeah I took my irridiums out of my 200, they were causing detonation :shock: :shock: :shock: