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"Lead" Fuel Additives?

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Re: "Lead" Fuel Additives?

I have a semi related question about gasoline. Has the method of posting octane rating at the pump changed since the 60's? It seems that Sunoco, Amaco and others major oil companies all offered high octane gas in the high 90's to low 100's. Now using the (R + M)/2 octane calculation, 92 is high octane. When all gas became unleaded did removing the lead additives decrease octane ratings that much? Just wondering and though you guys might know.

Safety Fast,
Dave
 
Re: "Lead" Fuel Additives?

I can't add much in what ignition advance to run, but the last motor I had in my mini had pretty high compression (unknown number, but high nontheless) and pinged big time on 92 pump juice. I added some NOS brand Racing Octane Booster at double the recomended dose and it quelled the pre-ignition quite well.
Paul
*edit* Unless you have hardened valve seats, you might want to consider some "lead" additive for valve seat "cushioning". My machinist showed me some valves that had been run hard w/o "lead", and they were pitted horribly.

[ 04-16-2004: Message edited by: mongoose ]</p>
 
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