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PostPosted: Tue Jul 20, 2021 2:27 pm 
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Just put my 9000 Aero through the mot. Passed with a couple advisaries. However, tester said I had a hell of a misfire. You dont detect it in the cabin but I have been suspicious so think he is right. In his opinion the pattern suggests fuelling isn't the issue, it's DI or plugs. Its's a fairly new genuine Saab DI so I am inclined to plugs. He was surprised I was running std NGK BR7 and suggested a Denso 4 electrode would be more suitable for a high tune as done by the Japanese racing fraternity. Comments anyone ?


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PostPosted: Tue Jul 20, 2021 4:22 pm 
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NGK's are the plug of choice really..smaller gap for higher tune..0.9 maybe..

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PostPosted: Tue Jul 20, 2021 9:47 pm 
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I use NGK BCR8's in mine if thats any help. Been using them for years without issue.

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PostPosted: Wed Jul 21, 2021 11:52 pm 
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Bcpr7es re the standard. Bcpr8es are a step colder on the same construction (which is important for knock sensing) but you can't get them any more. You can get bcr8es which are not quite the same but do the job, and were what I ran on my tuned b204. I found I knew when my plugs were done because the knock led started showing activity where under normal circumstances it didn't.

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PostPosted: Thu Jul 22, 2021 7:28 pm 
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BCPR8ES' are getting hard to find these days, you can run 7s but with a smaller plug gap, 0.8mm.

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PostPosted: Thu Jul 22, 2021 7:56 pm 
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PFS still list the 8's - not sure on the lead time though.

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PostPosted: Fri Jul 23, 2021 6:54 am 
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I think Neo's lists the 8's too IIRR

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PostPosted: Fri Jul 23, 2021 8:56 am 
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BCPR8ES (the proper construction used for knock sensing), or BCR8? I've not seen the former in the last 7 odd years, but I've not been looking.

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PostPosted: Fri Jul 23, 2021 12:08 pm 
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McVities wrote:
PFS still list the 8's - not sure on the lead time though.


BCR8

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PostPosted: Fri Jul 23, 2021 4:21 pm 
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nemesismoo wrote:
BCPR8ES' are getting hard to find these days, you can run 7s but with a smaller plug gap, 0.8mm.

I do this in both the 9000 and the 9-5.

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PostPosted: Sat Jul 24, 2021 11:02 am 
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razani67 wrote:
suggested a Denso 4 electrode would be more suitable for a high tune as done by the Japanese racing fraternity. Comments anyone ?

Bad plan. Trionic uses the plugs for knock detection and you should not change from the BCPR series because of that (although as stated BCR8 seem to work fine too).

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PostPosted: Sat Jul 24, 2021 11:25 pm 
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Jules_ht wrote:
razani67 wrote:
suggested a Denso 4 electrode would be more suitable for a high tune as done by the Japanese racing fraternity. Comments anyone ?

Bad plan. Trionic uses the plugs for knock detection and you should not change from the BCPR series because of that (although as stated BCR8 seem to work fine too).

To add some detail to that reply, Trionic maintains a voltage across the gap between sparks to sense various things like compression and knock. It does this by measuring the ionisation current flowing across the gap. Now you add three more electrode gaps and... I hope you can see what I'm getting at. I have to say I have not tried fitting multi-electrode plugs to a 9000 and observing what happens and I wouldn't be equipped to observe the effect properly if I did.

I was about to say that your experience demonstrates the difference, completely missed by most of the population, between a technician and an engineer. However, in this case I would say your MOT chap isn't even showing himself to be a good technician.

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PostPosted: Sun Jul 25, 2021 3:51 pm 
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I have loads of 7ES -11 in stock so for the moment have put a new set of those in. The old ones were 1yr old but had only done 3k mls so for the mo have put them back in stock. One big difference was the colour of the electrode. For years I have been running with a black electrode but couldn't detect a fuelling issue. (I have a thread on it somewhere) Since fitting PT map it is now dull grey. Mot man has said to take it back to him and he will check it out for free to see if any difference. I detect no change in the cabin
Incidentally, the mot involves an emissions check and no check on the ignition to my knowledge. Is he really picking up a misfire by observing the emissions?


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PostPosted: Sun Jul 25, 2021 6:11 pm 
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If there's a misfire, the combustion will be incomplete and therefore CO and hydrocarbons will rise.

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