Platinum or Iridium Spark Plug? Single or dual electrodes?

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Old 30 Dec 2011, 02:33 pm   #1 (permalink)
msrdude
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Default Platinum or Iridium Spark Plug? Single or dual electrodes?

I have a 96 corolla and I am wondering should i should stick with
platinum spark plugs or pay 4 bucks more a piece for iridium spark
plugs? Also would it make a difference if i get a single electrode or
dual electrode spark plug?
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Old 31 Dec 2011, 06:39 pm   #2 (permalink)
Jeff
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Default Re: Platinum or Iridium Spark Plug? Single or dual electrodes?

On Dec 30, 3:33*pm, msrdude <kim...@gmail.com> wrote:
> I have a 96 corolla and I am wondering should i should stick with
> platinum spark plugs or pay 4 bucks more a piece for iridium spark
> plugs? Also would it make a difference if i get a single electrode or
> dual electrode spark plug?


Just get what Toyota recommends.

Jeff
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Old 01 Jan 2012, 01:51 am   #3 (permalink)
larry moe 'n curly
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Default Re: Platinum or Iridium Spark Plug? Single or dual electrodes?

On Dec 30 2011, 1:33*pm, msrdude <kim...@gmail.com> wrote:
>
> I have a 96 corolla and I am wondering should i should stick with
> platinum spark plugs or pay 4 bucks more a piece for iridium spark
> plugs? Also would it make a difference if i get a single electrode or
> dual electrode spark plug?


Only one electrode fires on each combustion stroke, contrary to what
may be indicated by any advertisement animation.

Consumer Reports said, in their June, 1999 issue, that Bosch Plus 4
quad electrode plugs didn't show any significant improvement in power
or fuel economy, compared to NGK plugs, when tested in a 1993 Honda
Accord with 123, 000 miles.

Motor Trend, May, 1995, said AC Rapidfire plugs with splined center
electrodes (supposed to improve the odds of firing, just like multiple
ground electrodes) gave a statistically insignificant improvement:

http://www.motortrend.com/womt/112_9...s/viewall.html

I can't find anything credible providng that certain spark plugs are
superior to the ones recommended in the owner's manual for vehicles
made in the past ~20+ years. Apparently removing lead from gasoline
was the biggest improvement, followed by going to platinum, the latter
more for longevity than spark quality, and NGK had recommended that
vehicles with conventional plugs from the factory keep using them,
unless the manufacturer changed recommendations or if access to the
plugs was difficult.




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