MOGAS availability database

http://www.rotaryaviation.com/eficont.html

Its sitting in the box at the hangar.. just need to fabricate a custom
intake. The EFI runs off of a MAP sensor and and the stock crankshaft
position sensor (which derives RPM and ingnition timing points). Two
programming maps (data table): One is under load, and the other is for
low load/high RPM (such as in a descent).

No MAF's, No Throttle Position Sensors, No use of the oxygen sensor is
REGULAR use, only in programming the fuel maps (data table). Brutally
simple, but the aircraft mode of operation is pretty simple as well.

Dave

AINut wrote:
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

Jay Honeck wrote:

What we see flying all day long, day in and day out, are the
C-150s and Cherokee 140s -- both of which could be (and possibly already
are) running on mogas.

In many cases, you don't see the perfomance birds because they takeoff and go
somewhere. They're putting lots of hours in, but they aren't shooting T&Gs like
the bug-smasher crowd is.

George Patterson
There's plenty of room for all of God's creatures. Right next to the
mashed potatoes.

Newps wrote:


And I just fired up my lawn mower with last years gas a couple weeks
ago.

Well, I just fired mine up with last year's gas too. Almost made one circuit
around the yard before it developed spasms and limped back to it's home under
the porch.

I'll be draining the gas tomorrow.

George Patterson
There's plenty of room for all of God's creatures. Right next to the
mashed potatoes.

"Matt Barrow" wrote in message ...


Extremely poorly worded sentence. It has multiple meanings.

Only when taken out of context of the previous sentence




Yes, which is what the parenthesis are for...

My copy of the ASTM spec for avgas (D910) gives the max Tetraethyl Lead
(TEL) content in milliliters (ml), not grams. 100LL has 2 ml/gal max,
80 octane had 0.5 ml/gal max.

TEL is about 1.66 grams per milliliter, and TEL is about 55% lead by
weight. Multiply it out and there is about 128 grams or a little over
1/4 lb of lead in a 70 gallon tank of fuel.

I'd like to see the reference which suggests a lower TEL content for
100LL is typical.

I use Mogas almost exclusively