Sounds good, Dave. The ECU sounds like the MegaSquirt or one of it's
derivatives. However, how will you solve the O2 sensor problem? Maybe
you could use history data to maintain the fuel/air ratios?



Dave S wrote:

You are presuming that I am going to use the stock ECU (engine control
unit)..which is the last thing I would do. Stock ECU's do strange and
unpredictable things like turn off (or power down) the engine to
"protect" it when sensor readings get out of spec (like oil temp or
pressure parameters, etc)

The issue of ECU's have been discussed EXTENSIVELY in the forums that I
frequent: one is a list-serv dedicated to rotary engines, and the other
is a canard forum with a rotary engine portion. If you were a member
there you could spend hours and still not cover all the material, some
practical and some theoretical.

The ECU we will be using will be able to tune/make program adjustments
to the fuel map, but once programmed can operate without input from the
sensor.

Also, the neat thing about the Mazda rotary is.. no valves.

Dave

AINut wrote:

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