6A13TT Spark Plugs

Copper - BKR6ES

Iridium - BKR6EIX

Iridium 'Performance' - IRIWAY 7
(note: these are an iridium tipped plug with a colder rating)

Be cautious! In reality, most "performance" spark plugs are just colder heat ranges of the street versions of the spark plug. They don't provide any more voltage to the spark plug tip! Their internal construction is no different (in NGK's case, as all of our spark plugs must conform to the same level of quality controls) than most standard spark plugs.

NGK as a company tries to stay clear of saying that a racing spark plug (or ANY spark plug) will give you large gains in horsepower. While certain spark plugs are better suited to certain applications (and we're happy to counsel you in the right direction) we try to tell people that are looking to "screw in" some cheap horsepower that, in most cases, spark plugs are not the answer.

To be blunt, when experienced tuners build race motors, they select their spark plugs for different reasons: to remove heat more efficiently, provide sufficient spark to completely light all the air/fuel mixture, to survive the added stresses placed upon a high performance engine's spark plugs, and to achieve optimum piston-to-plug clearance.

Some of these "specialised racing plugs" are made with precious metal alloy centre/ground electrodes or fine wire tips or retracted-nose insulators. Again, these features do not necessarily mean that the spark plug will allow the engine to make more power, but these features are what allow the spark plug to survive in these tortuous conditions. Most racers know screwing in a new set of spark plugs will not magically "unlock" hidden horsepower.

 

I actually had a problem with my DOHC 6G72 that was directly attributed to "performance" plugs. They were gapped correctly and were the correct heat range but in high RPM the engine felt like it was being held back by a massive rope, like it was trying but nothing was happening...like those bad dreams we've all had when we sprint our butts off but don't move lol.

We changed back to the stock standard plug and it was perfect. Never had a problem with that motor since, it's now in another car in Melbourne and still going strong as.

 

shouldnt this be under genral or performance mods?

this isnt realy a guide

 

Agreed. Thead moved.

 

isn't it a guide on what plugs to use? *shrug*

 

Hmmm, I think the plan for this area is for How To threads with pics going through an install or maintenance of something.

Part numbers etc have been going in the general section.

Don't take it personally Mitch - the info is much appreciated!

Lee

 

oh ok, fair enough.

 

So what would be best for a more stock car, the BKR6EIX or go 1 colder and get the BKR7EIX?

 

i did my plugs yesterday, and put in the BKR6ES, seems fine.

 

Ok so by the sounds of it just stick to the normal heat range or go one colder if you have engine mods?

 

so there a manifold off for the rears by looking at it....is it a similar job to a magna??? A how to would be awesome... !!!

 

yes you do need to take the intake manifold for the rears, it is quite a bit of work!

 

a quick how to...unbolt everything
the manifold doesnt have to be removed completly from the car...you have to unbolt the big 'Y' pipe from the turbos and jsut start unbolting really. just enough so you can lift the manifold to the passengers side and hold it up with a big screw driver.

also note that if the car has done around 100000kms the spark plug donuts will prob be leaking. you have to buy these seperatly from the rocker cover gaskets

 

Donuts? You got a part number for those Dave?

 

no idea....i have all the sort of stuff at my parents place!!! they are just round gaskets theat fit into the rocker cover to stop the oil leaking ito the spak plug hole. you know they are leaking when you put your spark plug socket in and it comes out covered in oil!

 

Part number is MD178940

 

i had that on one of the rear ones dave

didn't know it was an issue until i removed the plugs, so i'll have to fix them next time i do the plugs.

 

Thanks Pete, and Dave for the info!

For those interested, CAPS internal reference number is 01111 "Gasket, Rocker Cover Spark Plug Hole"

 

I ordered the Rocker cover gasket today for when I do my plugs.
Mitsi charged 17.64 for it. (MD178940) Picked it up and its only for 1 so if you wanted to replace all you need x6
I also ordered the Ralliart air filter from them for $132 + GST

I'll take pics then they arrive.