Re: PIB as a fuel additive
I don't think any of the two-stroke oils actually contain high molecular weigh PIB, which is what the patents refer to. The stuff you get in lubricating oils has much shorter (and lighter) molecules, by many orders of magnitude, and would not be able to stabilize fuel droplets of any significant size.
The high molecular weigh stuff is extremely viscous, not like a liquid at all. If you read the patent, you can see that it actually behaves like a solid. That's because the molecules are simply too big to flow easily.
I bought some HMW PIB from Scientific Polymer Products back in 2002 --- Mw 4,700,000 --- but I didn't complete the experiment because I was concerned about it falling out of solution and gumming up the fuel injectors. I still have 99% of what I bought. I don't know if that outfit is still around.
If you use the high molecular weight stuff, you'll have to dissolve it in something --- I used gasoline in a clear gas container, and it took several days --- or just add a 'chunk' to your gas tank and pray that it dissolves in the gasoline, and doesn't get stuck anywhere.
I'm thinking of dissolving some in Sea Foam, and just adding a few capfuls to the tank each time I fill up. My driving habits are not regular enough to make it a reliable experiment, though.
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