All of the dozen or so airports I've contacted about mogas only have 87
octane. All are considerably higher priced than the most expensive gas
station.

If you use 100ll in an engine that has valves designed for no lead
usage, you're probably going to lose that engine. Also, the O2 sensors
will clog with lead very shortly. A propane torch can burn the lead off
it but you'll have to remove all the O2 sensors to do that. If the O2
sensors clog up during flight, the engine computer will go into limp
home mode. This usually means a *drastic* cut in horsepower, sometimes
engine stoppage.

HTH.



Dave S wrote:



Rich S. wrote:
Make that last idea a *must*, Dave. You don't know what you are
getting out

of a strange mogas tank. It may be 100° out and that mogas could've
been sitting in the tank since winter. My commandments read:
1. Never use mogas from an unfamiliar source.
2. Always test for alcohol.
3. Never use mogas above 5,000' density altitude.
4. Always check for water.
5. Never use mogas above 80° F.

Remember - 100 LL can foul a spark plug. Mogas can boil, give you
vapor lock, and stop your engine RFN. Which would you prefer? Would
you like fries with that?

Rich S.


Dude... I'm using mogas because I'm using a MO-engine. I've driven cars
at over 5000 ft (Lake Tahoe.. 9000 ft) MSL.. and in temps over 100* F...
and alcohol wont hurt MY engine because the seals in it and the fuel
system are DESIGNED to use motor gas in all of its domestic
forumulations. I think some of those "absolutes" you are listing are
overkill.

I will be using fuel injected engine with an automotive fuel rail
regulated at 40 PSI over upper deck pressure..through a recirculating
fuel circut with firesleeved hoses. I don't think vapor lock is gonna be
the issue here. I'm just planning on using 100LL because I dont want to
land on a 2000 ft sod strip 40 miles from the nearest town of over
50,000 people. I'm into flying to travel to where the people are