On Fri, 20 Apr 2007 14:10:14 GMT, Jose
wrote:

80/87 is leaded fuel. That's even a worse problem than 100LL.

My information (granted, many years old) is that while 80/87 is
nominally leaded, it actually has less lead than 100LL.

Is this still true?

Jose

Yup.

100LL has 2.0 grams of lead per gallon
80/87 has (had?) 0.5 grams of lead per gallon
FYI Regular (unleaded) mogas has 0.1 grams of lead per gallon.

The EAA STC (I suspect the Peterson is the same, but mine is from EAA)
says to mix 3/4 mogas with 1/4 100LL and you will get approximately
the same lead content as 80/87 (which should keep your engine happy if
it was designed to run on 80/87).

Quite frankly, I'm a bit surprised there isn't an AD out on all
aircraft with engines designed to run on 80/87, said AD warning that
running 100LL through these engines exclusively will likely lead to
plug fouling and stuck valves. If you don't use TCP or use other
methods to get rid of the excessive lead in 100LL, it'll only be a
matter of time before the fouled plugs and stuck valves manifest
themselves.

Bela P. Havasreti