Anyone know anything about NGK 7\'s

[Andyp]

Sorry for the size of these, but detail is important

Right found out tonight after a lot of struggling I\'m running 7\'s in the Rex. Below is a pic of it taken out... notice the muddy look and the short electrode. Below that is a semi-used ngk9..

Do the 7\'s run a same sized electrode in the middle as a 9... if so is that one shot to bits more or less...

Also can someone who know\'s 7\'s comment on the colour? It looked fudged or is it getting there? Should it be more liek the 9?

Much thanks

Andy Pandy

NGK7 - wots in there NOW


NGK 9\'s colour? Should the 7 be like this?

[scooby_si]

A BUR7EQ plug has the electrode much higher up inside the plug, thus it runs far "warmer" than a BUR9EQ

taken from the spark plug FAQ thread here
Other than that i am bugger all use.... But while i\'m here was that sumwhere in the UK which fitted 7\'s or was it imported with \'em just i had bugger all joy finding anywhere in UK that\'d do \'em (at proper price )
Si

[Andyp]

No they were witht he car, got a couple of sets... these have an "R" written on them too so dunno if they are racing plugs or wot...


If there\'s some call I could do a mass buy on 7\'s, would wanna get about 10+ sets (i.e. 40+) to make it worth it though.. other than that I\'m replacing them with ones I got from Re:Worx - 9\'s which were £37.5 delivered, which includes a free padded jiffy bag

[scooby_si]

yeah looks like i\'ll have to give the 9\'s a try all round but wood be intreged as to how much you could get 7\'s for if suitable quantities?
Si

[Andyp]

shouldn\'t think they\'ll work out anymore than 9\'s if I can get em lobbed in a container with some other stuff. Until then I\'m sticking with the 9\'s

[Andyp]

infact I\'ll write off to USA and find out

[scooby_si]

i\'m sold if you can get \'em close to the price then as however well 9\'s may work i\'d prefer to do wots recommended lol
Si

[20B_boy]

Right found out tonight after a lot of struggling I\'m running 7\'s in the Rex.

7\'s all around? Interesting. I had a set of 7\'s in my cars glove box when it arrived, they were badged as \'Racing\' plugs, in spite of them being normal surface discharge 7\'s...

Are you running stock boost un every thing Andy? If not then the warmer plugs all round mightn\'t be a great idea.

Depending what u can get em for from the US I\'d save the cash and do regular changes with cheapo 9\'s. NGK 7\'s and 8\'s are over 2000 yen in Japan, Denso a bit less. I think Glenn tried to get them in Aus but they were even more expensive...

9\'s all round seems to be the done thing.

[20B_boy]

Originally posted by scooby_si
as however well 9\'s may work i\'d prefer to do wots recommended

Depending on the market the car was for, 7\'s and 9\'s IS the recommended. I dont think 7\'s all round is stock for any FD?

May be I\'m not reading some thing right here - it happens!

[Glenn Butcher]

Andy,  you\'ll probably find that the lower plugs are 7\'s and the upper are 9\'s.

If they are 7\'s all round, then it is a little dangerous.  

Put new 7\'s in the leading (lower) and new 9\'s in the trailing (upper).

But you can get away with 9\'s all round but they can foul and you may have starting problems (depends how good your engine is).

[Andyp]

yeah be right glen only managed to get a one out probably

Yeah mine were badged "R" too, think that meant racing

Yeah I am running stock boost etc

[scooby_si]

yeah i was meaning i ideally wanted 7\'s & 9\'s in the appropriate places but was only commenting on 7\'s as well everyone has 9\'s already so not worried about getting them bad boys
Si

[maximtaylor]

9\'s start a car very well, so long as their condition is good.

I think the crucial thing with any plugs in a rotary is to change them very regularly. IMO I would change them as soon as the engine struggles to start, even if this means new plugs every few months.

Remember the 7\'s leading, 9\'s trailing combination is for stock cars only.

As soon as you start modifying your car, the real danger becomes high rev and load situations, where a 7 plug could quite easily start running too hot and cause rough running / detonation problems.

For the cost of a set of 9\'s every few months, is it worth risking losing a seal?

IMO anyone running more than 10 psi / 0.7 bar should not be running 7\'s, especially if they have a heavy right foot.

If you are at the one bar mark, you really need to be running even colder plugs - in the 10.5 to 11.5 heat range. This cold a plug does start giving cold start problems!

Here endeth the gospel according to Max

Regards

Max

[Shaq]

i thought i would have a look at my plugs on the weekend and they were really dirty ! gave them a good clean spent like 15min on each one ! LOL !
anyways ....

i noticed i had 9 NGK r in the bottom and 10 NGK r in the top

is this a good thing ?
i never have any starting problems ?



Shaq

[20B_boy]

Shouldnt be a problem.

On a Rotary I personally see plugs like oil i.e. a consumable you replace as often as you can....