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Mismatched plugs

 
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SiBag



Joined: 03 Mar 2012
Posts: 251
Location: Cheshire

PostPosted: Thu Jan 17, 2013 8:28 pm    Post subject: Mismatched plugs Reply with quote

OK I know you are all going to tell me to get a matched set of plugs BUT.
Ordered a set of Brisk plugs for my SB6. (AR10ZS)
But got set 2 x AR10ZS and 2 x AR12 ZS Mad
Basically the difference is the 12 are a hotter plug (NGK equivalent 8 )

IF I was to use them, would you run the hotter plugs on the inbord cylinders (I beleive they fuel a little richer). Or is it a total no no. Sad
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Si...
SB6..CCM R30...GSXR-750-M...RGV-250-VJ22.. GSX-1100-EFE Project....Harris Magnum II project...

If its got Ti#s or Wheels its gona give you trouble


Last edited by SiBag on Thu Jan 17, 2013 9:07 pm; edited 1 time in total
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Thu Jan 17, 2013 8:53 pm    Post subject: Reply with quote

I wouldn't do it.
Obviously you ordered a set but you didn't get what you ordered. Get onto them and sort out a matching set, its not like you're going to use the bike in the next 2 weeks.
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Vince186



Joined: 23 Mar 2012
Posts: 636
Location: Nijmegen (Netherlands)

PostPosted: Thu Jan 17, 2013 9:07 pm    Post subject: Reply with quote

I wouldn’t do it also, the operating temperature of the spark plug itself is very important.
Has the spark plug in the engine an too low temperature, then its possible the spark internally is contaminated by oily carbon deposits.
Has a spark plug too high a temperature, then its possible there is an self-ignition before the spark plug has sparked (pinging of the engine)
That is what they teach me long ago at school. Neutral
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sb6rdaz



Joined: 23 Nov 2010
Posts: 124
Location: Burton-upon-Trent

PostPosted: Thu Jan 17, 2013 9:09 pm    Post subject: Reply with quote

The inner cylinders on most water cooled bikes run hotter, so actually they run leaner, as the air is less dense in the hotter cylinders, so needs less fuel for the same ratio.

However, I ran my SB6R with 4 sample points on the downpipes, so effectively ran it as 4 1 cylinder engines on the dyno, to jet and set them independantly, and they run the exact same size main jet and needle height, which would suggest the cylinder temps are very even indeed.

Basically, you need matched plugs for the SB6/6R, as amazingly, all cylinders are very closely matched.

Daz.
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SiBag



Joined: 03 Mar 2012
Posts: 251
Location: Cheshire

PostPosted: Thu Jan 17, 2013 9:11 pm    Post subject: Reply with quote

Looks like I'll just have to hunt the supplyer down and TRY and get a replacement pair out of them.
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Si...
SB6..CCM R30...GSXR-750-M...RGV-250-VJ22.. GSX-1100-EFE Project....Harris Magnum II project...

If its got Ti#s or Wheels its gona give you trouble
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Thu Jan 17, 2013 9:15 pm    Post subject: Reply with quote

...As I told you on the other place......

Don't buy from there, don't use Brisk and use 4 plugs of the same value Wink Laughing
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Thu Jan 17, 2013 9:36 pm    Post subject: Reply with quote

...I remember when splitfire plugs came out, my missus used to sell them. Twice the price of ngk so everyone thought thy must be good. Great marketing because they were shit. Had a huge amount of returns because they were duff or bikes wouldn't run on them...... Wink
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SB6 mk1 (project mega light, big bore)
Sb6 mk2 ( Big Bore)
Sb6 mk2 ( Restored)
Sb6R fighter
Sb6 or Sb7 WANTED
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Fri Jan 18, 2013 12:08 am    Post subject: Reply with quote

Honestly - I don't think they're worth it. Plugs only spark to one place on the electrodes so it won't matter to much what the brand is.
I used irridiums for a while ... but they really didn't suit the engine, they didn't last long and if the bike wouldn't start you could bet the plugs were to blame.
If you want posh plugs use the twin electrode NGK
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SiBag



Joined: 03 Mar 2012
Posts: 251
Location: Cheshire

PostPosted: Sat Feb 02, 2013 1:23 pm    Post subject: Reply with quote

oily wrote:
...As I told you on the other place......

Don't buy from there, don't use Brisk and use 4 plugs of the same value Wink Laughing


Well, I'm happy to report that the seller honored his advert and has sent me a replaicement pair of plugs FOC. Very Happy Cool

So for once oily you apear to be misinformed. Surprised Razz

Thanks for all the advice.
I'll let you know how the brisk plugs work out.
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Si...
SB6..CCM R30...GSXR-750-M...RGV-250-VJ22.. GSX-1100-EFE Project....Harris Magnum II project...

If its got Ti#s or Wheels its gona give you trouble
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mad mundy



Joined: 06 Feb 2013
Posts: 25
Location: Australia

PostPosted: Wed Feb 06, 2013 8:28 am    Post subject: Reply with quote

Si,most of the information from previous replies are true,however I am new here &do not know your engine status.If you are interested I shall try for the fith time to logg a responce on 'hurleys dyno run'
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