Question on spark plugs - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-24-2007, 10:35 PM   #1
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I am new to the club, and in skimming posts, i keep seeing people say that platinum plugs are bad for the supercharged engine. my car currently has NGK platinum plugs, and i was wondering what the problem that people are talking about with the platinum plugs is, and what i should be looking for to see if my car is experiencing that problem. any comments would be helpful.
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Old 06-24-2007, 11:01 PM   #2
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Moved to 92-99. Please don't post tune-up or mechanical issues in Performance and Brainstorming.

Platinum or Irridium will be fine for you. Copper is preferred for Supercharged. Stay far away from Bosch plugs, wires, and sensors.
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Old 06-24-2007, 11:28 PM   #3
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Will, he is supercharged but I think the question is WHY is copper prefered for */C'd?
I searched a little but didn't come up with an answer and you probably have it memorized. LOL
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Old 06-24-2007, 11:51 PM   #4
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cause platinum has a lower melting point than copper and therefore copper will stay cooler?
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Old 06-25-2007, 12:55 AM   #5
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The answer is in Techinfo. I missed the SSEi in his signature.

http://www.bonnevilleclub.com/forum/...ighlight=spark
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Old 06-25-2007, 10:10 AM   #6
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i read that article, it said that platinums are confirmed bad, but what makes them bad, and should i consider changing my plugs asap? the plugs are fairly new, just wondering if they will cause problems if i leave them in or not.
thanks
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Old 06-25-2007, 10:17 AM   #7
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the nice part about putting in coppers is they are cheap. It'* not a big expense to gain some performance. If the platinums you have in a fairly new, reselll them.
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Old 06-25-2007, 10:42 AM   #8
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Platinums are bad in a boosted application because they run so hot. The tip almost "glows" in some applications, which is really bad for detonation (something a boosted car already has trouble with.)
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Old 06-25-2007, 10:49 AM   #9
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alright so what plugs should i get? atleast for a couple months the most modding i will do is an intake and high flow cat/ mufflers.
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Old 06-25-2007, 11:16 AM   #10
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Every spark removes a little of the platinum. I'd be surprised if they lasted a month. This will cause knock and detonation.

Get them out by the weekend. AC Delco OEM plugs (either copper or irridium, lean towards copper) or NGK. I prefer the NGK V-Power TR55. One heatrange colder than stock (good for any stock SC pulley or one step down), gap at .055", not .060".
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