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Re: Anyone running larger spark plug gaps?
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Posted by Plugged [Email] (more from Plugged) on Sun, 31 Aug 2003 11:42:21 Share Post by Email
In Reply to: Re: Anyone running larger spark plug gaps?, Dean, Sun, 31 Aug 2003 11:07:46
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Do you agree with potential "false knock readings" being attributable to platinum plugs?
I got this from another forum, please feel free to comment.

"Platinum is an N2O catalyst. If you put a platinum wire in a chamber with N2O it'll get hot, sometimes even glow red or white. N2O is a naturally produced gas in combustion, and it's that brown haze you see as smog. The Ionization Gap Sensor that Saab uses to detect knock is in some ways dependant on heat. The heat around the spark plug ionizes the gap, which allows a small amount of current to flow before ignition. The computer detects this and realizes that cyllinder is about to knock, or will be sensitive to knock if high boost, and full ignition advance is continued, and thus retards ignition/boost. The platinum spark plug may act like a catalyst to the N2O (NO2 even though produced in the exhaust will linger in the cyllinder because not all of the exhaust gasses are discharged) which would cause it to really heat up and CERTAINLY would set off the ionization gap sensor. The platinum surface of the spark plug would be like the surface on your catalytic converter, which is very hot and as a result highly ionized. Makes some sense doesn't it? ALSO ... you cannot use platunum plugs with Nitrous Oxide for presumably the same reason. The engine could very well ignite the N2O before it's supposed to!"

I know Maptun suggests using a 7 or even 8 heat range NGK plug in any B235R engine that is modified (tuned might be a better word) from stock. Specifically they suggest either the NGK BCR8ES or the BCPR7ES-11. Platinum is used to increase the longevity of the plug correct? If the plugs are being changed every 10k miles, is platinum even necessary? Are there other reasons for using a platinum plug? You do raise an interesting point about different conditions in Europe.

posted by 64.12.96...

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