Fuel boiling at fuel pump

[Seth Swoboda]

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Originally Posted by Tinker

I'm going to make a very uneducated assumption. So octane is around 89-91 now. In the 30's around 50-60? How much could that make a difference to it's stability?



Non Eth has been good to me however.

Tinker,

You have a valid and important observation. Our engines, at least in a flathead Ford 1953 and older, have relatively low compression. The fuels we use now have higher octane ratings. The flathead will run on and was designed for lower octane fuel. I mentioned before that I was reading some AACA forums on this topic of vapor lock and lower boiling points in gasoline today. Some of these guys who were driving prewar Cadillac's and Packard's were adding a 5% kerosene blend to a tank full of 87 octane gasoline to increase the gasoline boiling point. They found that because of the lower compression ratios their engines were able to run on the 5% blend of kerosene without experiencing engine knock. Some of these guys claimed it helped reduce or eliminate their vapor lock issues.