AVGAS 80 & MOGAS

My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of fueling
up an unmodified Cessna 150 with 92 octane MOGAS?


--
Dallas

On Oct 29, 1:42 pm, Dallas wrote:
My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of fueling
up an unmodified Cessna 150 with 92 octane MOGAS?

--
Dallas

Depending on where you live MOGAS may not be approved. Only certain
blends of MOGAS are approved by the FAA and many communities restrict
those blends. .
When I had the Aeronica I found the engine ran much cleaner on 80. It
burns a bit hotter so you get less deposits. The only reason 80 isn't
the preferred gas around the world is because higher compression
engines need the 100.

-Robert

On Mon, 29 Oct 2007 20:44:44 -0000, Robert M. Gary wrote:

When I had the Aeronica I found the engine ran much cleaner on 80.

A little research on my own dispelled my incorrect belief that the octane
rating had something to do with the potential power of fuel.

As it turns out, 80 is a pretty good fuel for low compression engines.

Another myth busted.

--
Dallas

"Robert M. Gary" wrote in message oups.com...
On Oct 29, 1:42 pm, Dallas wrote:
My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of fueling
up an unmodified Cessna 150 with 92 octane MOGAS?

--
Dallas

Depending on where you live MOGAS may not be approved. Only certain
blends of MOGAS are approved by the FAA and many communities restrict
those blends. .


Only if the airplane has the STC. If no STC, mogas is not approved...

In article ,
"Blueskies" wrote:

"Robert M. Gary" wrote in message
oups.com...
On Oct 29, 1:42 pm, Dallas wrote:
My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of fueling
up an unmodified Cessna 150 with 92 octane MOGAS?

--
Dallas

Depending on where you live MOGAS may not be approved. Only certain
blends of MOGAS are approved by the FAA and many communities restrict
those blends. .


Only if the airplane has the STC. If no STC, mogas is not approved...

There are two STCs involved:
1. Engine STC, verifying that the engine in question can safely run on
it.

2. The installation STC, which verifies that you will not get vapor lock.
In this case, a gravity-fed system has a major advantage.
For more than a one-off approval, you have to load the tank with 110F
fuel and climb to 10,000 feet to prove tha no vapor lock problems are
there. Sometimes an additional boost pump is required.

Dallas wrote:
My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of
fueling up an unmodified Cessna 150 with 92 octane MOGAS?

Here's some info on a auto fuel STC.

http://autofuelstc.com

On Mon, 29 Oct 2007 16:47:10 -0500, Gig 601XL Builder wrote:

Here's some info on a auto fuel STC.
http://autofuelstc.com

Very informative... thanks.

--
Dallas

You need an STC. I have the EAA one. Just go to their web page. You
can actually burn 87 octone fine on your O200 just make sure it does not
have ethanol in it. Cessna Pilots Associate actually recommends a
mixture of 100LL and AvGas for O200 and O300 engines after break in as
it better approximates the 80 Octane these engines were designed for
that the 100LL you are probably using. It will reduce your fowling
problems and stuck valves, and you won't need to run MMO.

Helen

Dallas wrote:
My C150M POH shows an approved fuel grade includes AVGAS 80.

Assuming you could find 80, how safe is it to run?

And, what are the modifications made to the fuel system to run MOGAS?

On a purely theoretical level, what would be the ramifications of fueling
up an unmodified Cessna 150 with 92 octane MOGAS?

On Oct 29, 6:31 pm, Helen wrote:
You need an STC. I have the EAA one.

I used to too. However, do you find many places that still has legal
autogas? In California it seems all the gas has the prohibited
ethanol. With the liberal states requiring ethanol to starve the
Mexicans from their tortillas and the midwester states requiring it to
boast their own pockets it doesn't seem like anyone is left with old
fashion, FAA approved, mogas.

-Robert

I used to too. However, do you find many places that still has legal
autogas? In California it seems all the gas has the prohibited
ethanol. With the liberal states requiring ethanol to starve the
Mexicans from their tortillas and the midwester states requiring it to
boast their own pockets it doesn't seem like anyone is left with old
fashion, FAA approved, mogas.

No problem getting unpolluted, ethanol free gas here in Iowa,
ironically the source of most ethanol.

Mary and I are about to pass 9,000 gallons of trouble-free mogas usage
in our Cherokee(s), all dispensed from our Mighty Grape fuel hauler.
At the current price differential of $2.25+ per gallon, using mogas
will have paid for my next engine...
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"