Platinum Plugs ? What are they good for? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-13-2006, 05:09 AM Thread Starter
 
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Platinum Plugs ? What are they good for?

Why don't they work well in a 258?

Do Platinum plugs fire at a lower Voltage?
What effect will this have on the current and spark gap?

I've tried a set in my CJ for a few thousand miles and gave up and put in normal plugs and they work perfect. I can cruise with 15" vacuum were as under the same condition I have to step on the pedal more dropping to 5" of vacuum with Platinum plugs.
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post #2 of (permalink) Old 09-13-2006, 06:20 AM
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Re: Platinum Plugs ? What are they good for?

There's a couple of advantages to a platinum plug. The spark gap doesn't wear as fast. Also the edges on the electrode and the ground stay sharper for a longer period.

Why aren't they working in the CJ? Got me? [img]/ubbthreads/images/graemlins/crazy.gif[/img]
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post #3 of (permalink) Old 09-13-2006, 08:07 AM
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Re: Platinum Plugs ? What are they good for?

i used bosch platinum plugs in my CJ w/ a 258 and it worked fine....

are you sure they were gapped right??
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post #4 of (permalink) Old 09-13-2006, 09:54 AM Thread Starter
 
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Re: Platinum Plugs ? What are they good for?

[ QUOTE ]
i used bosch platinum plugs in my CJ w/ a 258 and it worked fine....

are you sure they were gapped right??

[/ QUOTE ]

I gapped them at 0.050 +/-0.005" just like the Autolight plugs. That's what got me wondering if there should be a different gap distance because they are platinum.
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post #5 of (permalink) Old 09-13-2006, 02:51 PM
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Re: Platinum Plugs ? What are they good for?

Platinum plugs are great for vehicles like my wifes 2000 Grand Caravan with transverse mounted V6 and all wheel drive where it requires a midget china man with arms 4' long to change the rear plugs because you only want to change them every 100,000 if you can help it, they are a Mo Fo to change let me tell you [img]/ubbthreads/images/graemlins/shocked.gif[/img] . As for performance and what not, don't waste your money or time, a set of champs do the job FAR better in a vehicle where you can actually get to the plugs to change them every 15 to 25 thousand miles.
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post #6 of (permalink) Old 09-13-2006, 07:39 PM
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Re: Platinum Plugs ? What are they good for?

The hype:
Lower resistance gives more spark. True, but the 1/2 inch or so the platinum is used only lowers the resistance by??? Not a significant amount.

Platinum doesn't burn off as fast, lasting longer. True - they do seem to last longer.

So why don't they work well very often?
Look at the parts books for standard old fashioned plugs - look how many numbers/variations there are. Now look at plats - just a few. Obviously they are trying to make a few numbers fit thousands of applications - trying to reach "one size fits all." Ask your wife how "one size fits all" fits her.

Just because it screws in the hole does not mean the plug that works in a Yugo will be great in your Chevy and your lawnmower.

Engines are designed around a certain plug - the owners manuals call out that plug. Some engines are designed around the plats, if so, they'll work great in them. Stick to what it was engineered for and you can't go wrong.

Bosch - HITLER'S REVENGE - I won't use any of that stuff unless absolutly necesaary.
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post #7 of (permalink) Old 09-13-2006, 07:43 PM
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Re: Platinum Plugs ? What are they good for?

Right on Rich.........marketing hype.
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post #8 of (permalink) Old 09-13-2006, 07:59 PM
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Re: Platinum Plugs ? What are they good for?

Oh - I almost forgot --
They are "high performance" plugs --

The cost to make them isn't much more - but the selling price is much higher than standard.

"High performance" -- profits, what more could you ask?

.
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post #9 of (permalink) Old 09-13-2006, 08:01 PM
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Re: Platinum Plugs ? What are they good for?

IMHO, anything that promises "Performance" is usually a crock of bovine Manure and not worth the powder to blow it to hell... [img]/ubbthreads/images/graemlins/mad.gif[/img]
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post #10 of (permalink) Old 09-13-2006, 09:00 PM
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Re: Platinum Plugs ? What are they good for?

Amen, I hate those things. I cannot even count the number of times I've had a tech call for an issue with someone's Weber. Way too many times they are trying to run platinum, iridium or whatever unobtanium plug that doesn't belong in their engine, let alone with a performance carb. In most cases you're better off with a good solid copper core plug and change it out every 30k or even less. Cheap insurance and can also show you if there are any issues developing.
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