Thread: Mustang on Leaded Fuel...>help

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Originally posted by Bob Parmenter
Mike, I'm not worried about Mike's (that might get some heads spinnin' )posts................they're both accurate. Sorry if I used terms that were confusing, that's not the intent.

We talked about the valve seat recession less than a couple weeks ago; http://www.clubhotrod.com/forums/sho...alve+seat+weld

A little over a year ago Richard started a thread on engine tuning wherein we discussed some other of the factors involved in pinging; http://www.clubhotrod.com/forums/sho...alve+seat+weld

Personally it doesn't matter to me if folks want to accept the real causes of problems, or choose to believe mythology. I can't control that. I do, however, think it is useful to put out information that is valid and informed. Some folks will read it, some will do some extra research to proof it, and some will dismiss it out of hand. That's human nature. I've spent part of my career involved in fuel and lube developement and testing. We used a combination of dyno cells and real world fleet testing. I share the results of that research and developement here. Those that want to accept it will, others who don't won't. There are reasons for everything. For those curious to understand those reasons there's lots to be learned. For those that don't wish to spend the time pursuing that info, that's their choice.

Just to add some extra research possibilities for those interested, the Discovery Channel show "Myth Busters" did the sugar/gas tank thing in season two, episode 15 or 16. It's worth looking up or viewing if they do one of those marathon days again.

You are also correct about the octane rating numbers being different today than 30 years ago. But it's not just that actual octane ratings are lower today than then. If you look at that small octane rating sticker on the pump you'll see a formula printed there in tiny print. It says, R+M/2 (or it may have the division symbol instead of the slash). That means that the number on the pump, known as AKI (anti-knock index) is a product of averageing the R (for Research) method and the M (for Motor). The numbers used in the early '70's were based on the Research method, which is usually 6-8 points higher than the Motor method. So, as you've probably already figured out, the AKI is half way in between, so about 3-4 points lower than Research numbers.

all of this is very interesting and im sure a lot of things have changed in the last 30 yrs to a dif. way of thinking on a lot of this stuff, so ill just have to try to come to some understanding of my own, but i can talk about something i do know, that is sugar in gas. it will fill your carb. and motor up with syrup and stick pistons to the block and anybody says it wont don't know what he's talking about, or that guys wife know something about sugar that all these other people don't know, because she shut him down with sugar.