MoGas Long Term Test: 5000 gallons and counting...

In rec.aviation.owning kontiki wrote:
: My Comanche has an O-540 and at 22/23 I'm burning about 13 Gph with 100LL.
: If there was an MOGAS STC for the Comanche I'd give it a try but that will
: never happen.

I talked with Petersen about the PA-24. It hydro-locks the carb and floods
the engine, so no STC for it. Basically the opposite of vapor-locking AIUI... boiling
fuel pressurizes the carb and forces liquid fuel out. That's different from
vapor-locking where boiling in the lines prevents pumping and it goes dry.

-Cory

--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

Jay Honeck wrote:



At cruise we
tend to run 23 squared, leaned back to 15 gph.

????? No wonder you got fouled plugs. You should be around 13 gph at
23 squared for a 230 hp engine.

In article , Newps wrote:
Jay Honeck wrote:
At cruise we
tend to run 23 squared, leaned back to 15 gph.

????? No wonder you got fouled plugs. You should be around 13 gph at
23 squared for a 230 hp engine.

I'd strongly agree with this. I used to fly an S-35 Bonanza with an
IO-520, and I'd get about 13 gph in cruise (at 160 ktas at 8000'). I'd
expect Jay's plane not to burn more than this.

--
Dylan Smith, Castletown, Isle of Man
Flying: http://www.dylansmith.net
Frontier Elite Universe: http://www.alioth.net
"Maintain thine airspeed, lest the ground come up and smite thee"

Dylan Smith wrote:

In article , Newps wrote:

Jay Honeck wrote:

At cruise we
tend to run 23 squared, leaned back to 15 gph.

????? No wonder you got fouled plugs. You should be around 13 gph at
23 squared for a 230 hp engine.


I'd strongly agree with this. I used to fly an S-35 Bonanza with an
IO-520, and I'd get about 13 gph in cruise (at 160 ktas at 8000'). I'd
expect Jay's plane not to burn more than this.

Which also explains why Jay can immediately tell if he is running mogas
or 100LL apparently. I can never tell. It never makes any difference
whatsoever.

"Jay Honeck" wrote in message news:_eAfe.67985$WI3.223@attbi_s71...

The Grape itself cost $1800, and the tank/pump installation (and a couple of other things) make up the other $700 or
so.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"


Any more details about The Grape?

The Grape itself cost $1800, and the tank/pump installation (and a couple
of other things) make up the other $700 or so.

Any more details about The Grape?

See: http://alexisparkinn.com/fuel_truck.htm

If you have any other questions, please feel free to ask.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

("Blueskies" wrote)
Any more details about The Grape?


Jay might finally be willing to allow a "Purple Pride" bumper sticker on The
Mighty Grape ...now that Randy Moss has been sent to Oakland. g

Probably not though.


Montblack
45 years of Purple

Jay might finally be willing to allow a "Purple Pride" bumper sticker on
The Mighty Grape ...now that Randy Moss has been sent to Oakland. g

With Moss' departure, the Vikings have taken one small step back toward
legitimacy. They've still got a long ways to go, however.

When they start playing outside again, I'll know they've returned from the
Dark Side.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

In article ,
Jim Carriere wrote:

Jay Honeck wrote:
Yesterday I noticed that we had pumped more than 5000 gallons of mogas
through the Mighty Grape. This represents something like 60 complete fills
(our plane has four gas tanks, totaling 84 gallons), and around 350 hours
of
flight time over the last 2.5 years.

Awww, anecdotal evidence. Statistically speaking, you need a larger
sample size

But seriously, a good post, well documented.

'Couple questions-

Do you use the same spark plugs (and same heat range) as before going
to mogas?


I do, too -- plugs last longer without the lead in the fuel.



Do you lean, and how lean? What kind of numbers do you usually see
in different regimes of flight (EGT, CHT)? Obviously detonation
hasn't been a problem for you, I'm curious how hot you can get away
with on that engine with regular auto fuel.


Detonation is NEVER a problem when the octane is correct. If the engine
is designed for 80 octane, it will happily drink 80 octane mogas or
anything else that meets the minimum spec. The absence of lead in the
fuel simply means that there is less junk to scavenge out of the
combustion products.

BTW, how many out there are aware that 80 octane unleaded avgas used to
be available, back in the 40s and 50s?

--
Remove _'s from email address to talk to me.

BTW, how many out there are aware that 80 octane unleaded avgas used to
be available, back in the 40s and 50s?

--


Actually I think it was available up into the mid to late 70s...

80/88, and it was colored Red...

BT