Take a look at the bottom of this page in the online manual :-

http://www.300zx.co.uk/tech/manual/manual/ma/018.gif

According to some of the references inside it specifically covers the Australian and Euopean models.

 

It clearly states that the standard spark plug for a TT is PFR6B-11C whereas in my official, printed Nissan workshop manual, that also specifically covers the Australian and European models, it clearly states that the correct plug is PFR6B-11 ????? Can't they make their minds up ?

 

There is clearly more than one edition. I know that mine is the February 1990 edition, but I don't know what the online version is as that page has not been scanned. Incidentally, mine has more pages in certain sections.

 

In the words of Toyah, "It's a Mythtery" !

Originally posted by MAC 1

Hey Mark!

 

I was talking to Latz on the phone today about your theory! I think he is still pissing himself laughing at the HKS plugs not delivering the spark in the correct place:D:D:D

 

 

Then contribute to the debate with a reason why you think one is better than the other!:D

Originally posted by TopLess

Then contribute to the debate with a reason why you think one is better than the other!:D

 

 

 

 

EHHHHHHHHHHHHHHHHHHHH?

I told you the reason on MSN:rolleyes: Or is this just I want my last word in post?

NO,

 

The whole purpose of these threads for me is so that people can have a look at the different ideas around and make up their own mind!

 

It's not top secret, you can tell us why do Irridiums work then?

 

Mark:D

Originally posted by TopLess

NO,

 

The whole purpose of these threads for me is so that people can have a look at the different ideas around and make up their own mind!

 

It's not top secret, you can tell us why do Irridiums work then?

 

Mark:D

 

 

LMFAO:D FFS I already did on this thread 9 posts back!

 

Just for you Clueless I mean Topless:D:p

 

http://www.hksusa.com/products/more.asp?id=730

LMFAO argueing about spark plug length :D:D:D Its not the size that counts blah blah :D

 

Both views are correct - the Denso's (HKS/Blitz) are slightly shorter nose length - yes this does affect performance slightly but not significantly IMO. ANY plug will deteriorate faster under higher boost conditions. Therefore, iridium, being more temperature stable, suits higher boost better than platinum. HOWEVER, I don't think there will be TOO much difference between the two. The basic fact is, if the spark is igniting the fuel in the correct place at the correct time, NOTHING you do to the spark/plug supply voltage etc will make any improvements - IE if you notice a difference in performance when you fit some different plugs, your old ones were shot. There should be NO difference in performance between standard and aftermarket plugs! If you do find a difference, then you are either running too high boost for the gap or the wrong temperature range plug (both kinda mean the same thing really :D)

 

Now stop bickering :D

 

CheerZ,

 

Andy

I think it's down to the Iridiums being more expensive so you are sure they'll make your Z go faster ;)

The voice of reason from Andy Duff!!!!!!!

 

What is going on:D

Originally posted by TopLess

NO,

 

The whole purpose of these threads for me is so that people can have a look at the different ideas around and make up their own mind!

 

 

 

I have made up my own mind,and you wittering on about mm will never change it so :p:p:p:p

I think I finally have to agree we are argueing about shades of grey!!!

 

The thing is with all the polishing and porting work done on my heads, the Irridium plugs will reach pretty far into my Z's chamber, so I could start using them!

 

They are great in my S13!!!!!!!!!!!!!!

 

 

The thing is when you have hooked a big fish like Macca, you just gotta keep on winding!!!!!!!!!

 

:D :D :D :D :D :D :D

 

 

LOL

 

Mark

Hey fishhead don't use them they don't work:D:D:D:D:p

Having just spent most of my lunch time break reading the backlog on this subject I'm still not too sure what to believe. Why would there be such a large market in aftermarket plugs if any correctly sized new plug will do the exact same job? Is it simply a question of longevity?

 

I was hoping to read through this and reach the end with a clear view on which replacement plugs to fit - some hope eh!

 

Seems the 11Bs is the best guess for what I've read. - I can't seem to open Mac's post on Iridium plugs.

 

For the record, my man TT has increased boost too, but I want to get the best from the car without having to change plugs after each bend in the road!

Nigel,

 

Have to agree with what your saying I am running higher boost and using 11Cs and car is running fine.

 

BUT

 

Is the conclusion that 11Bs are better or what ???????

Originally posted by NigelBoyd

 

Seems the 11Bs is the best guess for what I've read. - I can't seem to open Mac's post on Iridium plugs.

 

 

 

Ok Just for you Nige;) Time to change your mind now LOL;)

 

HKS Super Fire Racing spark plugs are a series of high performance Iridium spark plugs that are designed for high performance street applications that can handle high levels of tuning and still be able to offer easy start-ups and smooth idling. Utilizing a 0.4mm diameter Iridium plug electrode core and an U-shaped grooved electrode lowers the required voltage for the a spark to occur while maintaining the appropriate gapping, thus providing a stronger ignition spark, a stable idle, and reduces misfires.

 

 

 

 

 

 

Online Catalog > Engine > Ignition Components > Spark Plugs >

 

Iridium Spark Plug (more)

 

 

 

 

 

The Iridium alloy is used because of its durability and reliability. On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity. With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration. The Iridium plugs are available for multiple applications and offered in “colder” heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered.

well, when you put it like that they sound quite good, but then again, if they don't make them the exact right length for the Z, are they as good as they sound?

Should I take the Bosch plugs out of my NA then?

Personally yes i would, cos for the sake of 40 odd quid you may as well fit what normally is fitted in em and have piece of mind mate.

IMO of course

smithy

Personally yes i would, cos for the sake of 40 odd quid you may as well fit what normally is fitted in em and have piece of mind mate.

IMO of course

smithy

 

 

Balls - is there anything I can take to the garage that fitted the Bosch ones that shows they're wrong and try and get my money back?

Alot of people say pfr6b11 on its own is a na plug but this is used in high power 200sx s14 turbo cars .I dont get the bit about the plug going further down into the cylinder surley this would cause problems blowing out the plug gap .[spark]

i think the thought was that if the plug , even though it fitted, wasnt long enough there was potential in the chambe for moving the ignition point closer to the wall of the block. This possible has the potential to A - lose poewer as the mixture is igniting off centre and B - create hotspots on the cylinder/block wall which could lead to pre-ingniton(det) and death!

Balls - is there anything I can take to the garage that fitted the Bosch ones that shows they're wrong and try and get my money back?

 

Other than saying that Nissan fitted NGK to Zeds at the factory and reccommended them there after, hence Zed specialists fit them also and you would prefer to stick with what Nissan intended.

cheers

smithy

Balls - is there anything I can take to the garage that fitted the Bosch ones that shows they're wrong and try and get my money back?

 

I'm sure that the plugs were specifically designed for the Z32 engine, so in theory that's what should be fitted. On the other hand. if what you've got is the right spec and works then why bother changing them. They probably just won't last as long as the highly expensive NGK originals. I had a set of expensive Iridiums and they only lasted about 10K, went back to pukka NGK after that.