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[feeutfo]

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More electrodes, 4 lesser sparks to the centre as opposed to 2 bigger, therefor less ware on the tips no?

AFAIAA (that's the rider  ) it don't work like that. You just get one spark between the centre & which ever tip is closest, as they wear away another tip is 'it' until another tip becomes the closest etc etc etc etc.

Oh ok, still don't see how quads shield more than twins though, that being the case....?

[Lazydocker]

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More electrodes, 4 lesser sparks to the centre as opposed to 2 bigger, therefor less ware on the tips no?

AFAIAA (that's the rider  ) it don't work like that. You just get one spark between the centre & which ever tip is closest, as they wear away another tip is 'it' until another tip becomes the closest etc etc etc etc.

Oh ok, still don't see how quads shield more than twins though, that being the case....?

That is the case. They shield more because the volatile mix will get captured inside the tips. We are talking on a small scale here though

TBH, there's probably very little difference... Just following advice from LPG professionals and users :-/

[Andy B]

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Oh ok, still don't see how quads shield more than twins though, that being the case....?

Neither can I but some people are followers ......  The spark would be visible from the piston crown whether two or four due to where the sparks travels. Having said that, I had quads in my car and when I recently removed one just to have a look, it was noticeably worn despite nothing like 80k on them.

[Andy B]

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That is the case. They shield more because the volatile mix will get captured inside the tips. We are talking on a small scale here though

....

I think that would be the case if multi-electrode plugs had the same tip to electrode positional relationship as an old style single has.  :-/ :-/ :-/

[Kevin Wood]

TBH, there's probably very little difference... Just following advice from LPG professionals and users :-/

Agreed. I've never noticed any performance difference between any different types of plug. They either ignite the fuel mixture, or they don't and you have a misfire.

4 electrodes will simply just last longer due to more material to get eroded away, hence their use where an 80k service life is specified.

Kevin

[mahony]

Ive been using bosch super fours for the last 3yrs in my miggy,checked them two weeks ago no wear detected on plugs,engine runs  sweet as a nut on them 

[Kevin Wood]

Ive been using bosch super fours for the last 3yrs in my miggy,checked them two weeks ago no wear detected on plugs,engine runs  sweet as a nut on them 

I think that's exactly what the GM ones are. One set I had even had the Bosch name on them.... at a bargain price.

Kevin