Autogas Tips and Tricks

Al wrote:
With 100LL now creeping toward the $5 mark (or more), it's time to
take advantage of the Peterson autogas STC in our 172E. What are the
tips and tricks for operating with mogas. Different run-up
techniques? Taxiing, hi temperatures, vapor lock avoidance, winter
ops. You name it. Inquiring minds want to know.

Thanks in advance.

Al
1964 172E
KSFF

Find someplace where the autogas mixture is not prohibited by the FAA.

-robert

Robert, please go away. Your incessant obsequiousness to the FAA is
becoming irritating to those of us who want practicality in our lives.

Jim




"Robert M. Gary" wrote in message
oups.com...

Find someplace where the autogas mixture is not prohibited by the FAA.

In article .com,
"Robert M. Gary" wrote:

Al wrote:
With 100LL now creeping toward the $5 mark (or more), it's time to
take advantage of the Peterson autogas STC in our 172E. What are the
tips and tricks for operating with mogas. Different run-up
techniques? Taxiing, hi temperatures, vapor lock avoidance, winter
ops. You name it. Inquiring minds want to know.

Thanks in advance.

Al
1964 172E
KSFF

Find someplace where the autogas mixture is not prohibited by the FAA.

-robert

That would be everywhere in the USA. As long as you have the appropriate
STC's and mogas, you can mix avgas and mogas to your heart's content.

For experimentals, it is a matter of engine compatibility.

On Apr 27, 6:06 am, Orval Fairbairn wrote:
In article .com,
"Robert M. Gary" wrote:





Al wrote:
With 100LL now creeping toward the $5 mark (or more), it's time to
take advantage of the Peterson autogas STC in our 172E. What are the
tips and tricks for operating with mogas. Different run-up
techniques? Taxiing, hi temperatures, vapor lock avoidance, winter
ops. You name it. Inquiring minds want to know.

Thanks in advance.

Al
1964 172E
KSFF

Find someplace where the autogas mixture is not prohibited by the FAA.

-robert

That would be everywhere in the USA. As long as you have the appropriate
STC's and mogas, you can mix avgas and mogas to your heart's content.

Which STC allows for mogas with alcohol? I've called EAA on this and
they said they are not aware of any. The FAA is concerned that the
seals in the fuel system will break. Besides, I've seen what this new
mogas has done to my weed-eater. The local mower shop is backed up 45
days in repair cleaning out carbs trying to get this cruddy gas out.

-Robert

In article . com,
"Robert M. Gary" wrote:

On Apr 27, 6:06 am, Orval Fairbairn wrote:
In article .com,
"Robert M. Gary" wrote:





Al wrote:
With 100LL now creeping toward the $5 mark (or more), it's time to
take advantage of the Peterson autogas STC in our 172E. What are the
tips and tricks for operating with mogas. Different run-up
techniques? Taxiing, hi temperatures, vapor lock avoidance, winter
ops. You name it. Inquiring minds want to know.

Thanks in advance.

Al
1964 172E
KSFF

Find someplace where the autogas mixture is not prohibited by the FAA.

-robert

That would be everywhere in the USA. As long as you have the appropriate
STC's and mogas, you can mix avgas and mogas to your heart's content.

Which STC allows for mogas with alcohol? I've called EAA on this and
they said they are not aware of any. The FAA is concerned that the
seals in the fuel system will break. Besides, I've seen what this new
mogas has done to my weed-eater. The local mower shop is backed up 45
days in repair cleaning out carbs trying to get this cruddy gas out.

-Robert

Robert,

You didn't ask about mogas containing alcohol -- you asked about
mogas/avgas mixing. You are correct that alcohol and aviation hoses,
seals, fibreglass tanks, etc. are, at best, an iffy proposition and are
not approved.

Boat operators, for instance, are having problems with alcohol attacking
fibreglass fuel tanks. It decomposes the resin (probably polyester) and
deposits goo in fuel filters, carburetors, etc.

In fact, there is a problem if you run petroleum-based fuel and switch
to parrafin-based fuel, or vice-versa. The neoprene hoses acclimate to
the fuel in use and harden when another type is introduced.

This phenomenon is probably the cause of a rash of vehicle fires in the
1990s in California, when MTBE was introduced to fuel there.

On Apr 27, 12:42 pm, Orval Fairbairn
wrote:

You didn't ask about mogas containing alcohol -- you asked about
mogas/avgas mixing.

I pointed out that the mixture that the refineries are using generally
prohibit the resulting mogas from being used in aircraft. I never said
anything about mixing avgas with mogas.

-robert

In fact, there is a problem if you run petroleum-based fuel and switch
to parrafin-based fuel, or vice-versa.

Isn't paraffin just part of petroleum product? Mogas, avgas and jet-A
are all largely paraffinic. Mogas nowadays have a fairly high
aromatics content.

"Orval Fairbairn" wrote

Boat operators, for instance, are having problems with alcohol attacking
fibreglass fuel tanks. It decomposes the resin (probably polyester) and
deposits goo in fuel filters, carburetors, etc.

In fact, there is a problem if you run petroleum-based fuel and switch
to parrafin-based fuel, or vice-versa. The neoprene hoses acclimate to
the fuel in use and harden when another type is introduced.

I had a problem with 10% alcohol fuel, back around 1988, when I filled up
twice in a row, with the alcohol fuel, in a 34' Pace Arrow motor home.

Halfway through the second tank, it started to run at about half power.
(not enough power to pull a good sized hill)

Long to short, after much hair pulling, I discovered that all of the varnish
accumulated in the fuel system for thousands of gallons, and 10 or so years,
was suddenly dissolved, and then deposited in the big canister type fuel
filter.

I would think that even if the fuel hoses and O-rings and such were alcohol
safe, that this type of problem could be very likely to happen in an
airplane.
--
Jim in NC