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Spark plugs...Iridium vs Silver

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FullStop
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Spark plugs...Iridium vs Silver

Postby FullStop » June 26th, 2008, 7:31 pm

Is there really a performance difference...

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RBphoto
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Postby RBphoto » June 27th, 2008, 7:18 am

They have silver plugs? best metallic conductor of electricity, but not too sure how well that will stand up to oxidation/ sulphur attack. Probably have to change them after a few races. The reason for use of platinum and irridium is not only conduction, but resistance to heat in the combustion chamber. What make are the silver plugs (to check website of manufacturer)?

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Postby X_Factor » June 27th, 2008, 8:06 am

he is probably talkin bout nology

there are also laser iridium/platinum

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Postby honda hoe » June 27th, 2008, 9:59 am

never heard bout silver plugs...

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Postby Rodn3y » June 27th, 2008, 11:43 am

NOLOGY has plugs with silver tip. silver is more conductive to electricity than irridium and platinum and nology says that silver is also the best thermal conductor.

http://www.nology.com/silver.html

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dmitc
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Postby dmitc » June 27th, 2008, 11:44 am

what about the heat resitance of silver plugs. would not the melting point of silver be a concern in spark plug use

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Postby RBphoto » June 27th, 2008, 12:09 pm

dmitc wrote:what about the heat resitance of silver plugs. would not the melting point of silver be a concern in spark plug use


They are verry thermally conductive, so I would guess they would dissipate heat faster to their threads, making them a colder plug.

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Postby rjaggs » June 27th, 2008, 1:10 pm

crossdrilled wrote:They have silver plugs? best metallic conductor of electricity, but not too sure how well that will stand up to oxidation/ sulphur attack. Probably have to change them after a few races. The reason for use of platinum and irridium is not only conduction, but resistance to heat in the combustion chamber. What make are the silver plugs (to check website of manufacturer)?


silver is the third least reactive metal, after platinum and gold

melting points:

Iridium: 2410ºC
Platinum: 1772ºC
Silver: 962ºC

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FullStop
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Postby FullStop » June 27th, 2008, 10:59 pm

does all this data point to silver plugs having an initial advantage, i.e. with better conductivity, but iridium outlasting it, relative to silver, iridium is a pretty poor conductor isnt it?

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Postby rjaggs » June 30th, 2008, 9:54 am

^ I guess we have to test it ourselves....any volunteers?

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FullStop
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Postby FullStop » June 30th, 2008, 9:59 am

bought a set of the silver plugs and the 323 feels a little livlier, throttle response has improved some...placebo effect?

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Postby Alpha_2nr » June 30th, 2008, 1:32 pm

^Yep most likely.

Plugs....alone...will hardly change performance per say. I dare anyone to change plugs alone on their car, and put it on a dyno to register a change in hp or torque (and not a MANUFACTURER's CLAIM!) ! And minor changes like that (1-2hp) can hardly be felt on day-to-day driving.

What it WILL change in most cases, is your service interval, as Iridiums/Plats will have superior construction, and will outlast regular plugs 5-fold. Heat range selection can also assist with F/I cars...and combatting detonation etc.

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rjaggs
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Postby rjaggs » June 30th, 2008, 2:05 pm

only time plugs make a difference is when they real badly off and u replace them.....

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Postby MG Man » June 30th, 2008, 8:15 pm

^^^yup
plugs do not increase power....they just make better us of what's already there
what is more important to an engine is a plug's heat range,ie ht or cold, but that's a whole other debate

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Postby rjaggs » July 4th, 2008, 4:34 pm

I get the best performance from oem plugs in my stock mivec

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