54 replies to this topic

[maggies_minder]

I can't believe that we've taken 3 pages to tell the OP that a BP6ES will be fine for most road use!

i thought about posting something similar yesterday, im suprised it carried on for so long.

i doubt the OP expect all this

[SolarB]

I can't believe that we've taken 3 pages to tell the OP that a BP6ES will be fine for most road use!

and they're less than £1.50 each - Linky

Interesting discussion, but I don't think they will do anything for an A series. A spark is defined by the size of the gap it operates over and it's voltage. These are set by the coil output, the series resistance of the circuit and the electrode gap.
The design of the plug takes care of the thermal management and is tailored to the materials used for the construction of the plug, be it a fancy rare metal or something cheaper. Steel or copper cored plugs don't overheat, the tip is constructed to dissipate the heat.

I can believe that plugs are engineered to increase service intervals but not to increase power. I'm reminded of the multiple electrode plugs, the pretty picture might show multiple sparks but you only get one.

[samsfern]

and you only need one good spark to ignite a good compressed fuel and air mix.

[Carlzilla]

£48 for a spark plug that wears out quickly? cool.

I think we will have to agree to differ on whether it is a worthwile expense, and if the gains are to be believed.

It must be fraustrating not being able to convince me, but I know how you feel. I once bought one of these CG lock, mentioned it on here and got shot down in flames. But actually it's a great product IMO and really does improve lap times, hey-ho.

I quite like the idea of those cg lock seatbelt add-ons.

All very interesting, but I've not learned anything new, I've already indexed my plugs. In fact thinkong about it the lack of requirement to index the the Brisk plugs may just account for the apparent increase.

I also don't understand the argument about the conductivity; electrically we already know that there is a 5k Ohm resistor in the plug, so not much gain to be made. Thermally, well the exotic material (silver, copper etc) is only used for the tip and core (and surely the core of Brisk plugs is not silver otherwise at £15 each they'd be a bargain), not the whole spark plug, in the main they are constructed from steel. The heat conductivity is all to do with keeping the nose at the right temperature. This is achieved by exposing or shrouding the nose, which is ceramic, not metalic.

So all the above has done is convince me further that it'd be fifty quid down the drain.

The 5K ohm ceramic resistor in a spark plug, is there to suppress RFI/EMI and does very little to the voltage passing along the core of the spark plug, now when we introduce precious metals such as Silver for the core and tip (yes BRISK silver spark plugs have a Silver core and tip!) then the electrical conductivity of Silver is better than any precious metal currently used in spark plug technology, and requires less energy from the ignition system, therefore provides a far stronger spark.

Silver is the best at firing tip heat dissipation, and therefore offers faster thermal conductivity, keeping the tip at it's designated working temperature, and allowing the spark plug to transmit heat away into the body and so into the cylinder head.

At the end of the day, how i see it, is that it doesnt matter what the hell you put in the spark plug, as the rest of the ignition circuit is largely copper based.
Its exactly the same sort of idea in my head, as if you had a narrow tube and blew through it, if you enlarged the end it still wouldnt make it easier to blow through.

If anybody would like to know what plugs i bought after some thinking, they were NGK BPR6ES's, for the low sum of 11 quid. (motor factors didnt have BP6ES's but i doubt theres much difference if any involved)

[Carlzilla]

I can't believe that we've taken 3 pages to tell the OP that a BP6ES will be fine for most road use!

i thought about posting something similar yesterday, im suprised it carried on for so long.

i doubt the OP expect all this

No, i didnt

[Cerberus]

£48 for a spark plug that wears out quickly? cool.

I think we will have to agree to differ on whether it is a worthwile expense, and if the gains are to be believed.

It must be fraustrating not being able to convince me, but I know how you feel. I once bought one of these CG lock, mentioned it on here and got shot down in flames. But actually it's a great product IMO and really does improve lap times, hey-ho.

I quite like the idea of those cg lock seatbelt add-ons.

All very interesting, but I've not learned anything new, I've already indexed my plugs. In fact thinkong about it the lack of requirement to index the the Brisk plugs may just account for the apparent increase.

I also don't understand the argument about the conductivity; electrically we already know that there is a 5k Ohm resistor in the plug, so not much gain to be made. Thermally, well the exotic material (silver, copper etc) is only used for the tip and core (and surely the core of Brisk plugs is not silver otherwise at £15 each they'd be a bargain), not the whole spark plug, in the main they are constructed from steel. The heat conductivity is all to do with keeping the nose at the right temperature. This is achieved by exposing or shrouding the nose, which is ceramic, not metalic.

So all the above has done is convince me further that it'd be fifty quid down the drain.

The 5K ohm ceramic resistor in a spark plug, is there to suppress RFI/EMI and does very little to the voltage passing along the core of the spark plug, now when we introduce precious metals such as Silver for the core and tip (yes BRISK silver spark plugs have a Silver core and tip!) then the electrical conductivity of Silver is better than any precious metal currently used in spark plug technology, and requires less energy from the ignition system, therefore provides a far stronger spark.

Silver is the best at firing tip heat dissipation, and therefore offers faster thermal conductivity, keeping the tip at it's designated working temperature, and allowing the spark plug to transmit heat away into the body and so into the cylinder head.

At the end of the day, how i see it, is that it doesnt matter what the hell you put in the spark plug, as the rest of the ignition circuit is largely copper based.
Its exactly the same sort of idea in my head, as if you had a narrow tube and blew through it, if you enlarged the end it still wouldnt make it easier to blow through.

If anybody would like to know what plugs i bought after some thinking, they were NGK BPR6ES's, for the low sum of 11 quid. (motor factors didnt have BP6ES's but i doubt theres much difference if any involved)

The Rs, are for interference damping or something. Same plug basically.

[Czar]

The Letter "R" in a spark plug reference stands for resistance, and this is electrical pulse suppression, otherwise known as RFI, Radio Frequency Interference, or EMI, electromagnetic interference, the more common problem you may suffer from using spark plugs without resistance suppression will be radio interference.

There are other problems associated from running without resistance suppression too in more modern vehicles, but that's another story.

Edited by Czar, 14 October 2010 - 03:27 PM.

[samsfern]

you dont say...

[Czar]

you dont say...

I'm just offering good correct professional advice, take it or leave, believe it or don't.

[samsfern]

i think ill stick with my ngk bp7es's.

Edited by samsfern, 14 October 2010 - 04:19 PM.