Rotax 2 cycle Oil mixture

[ULWA]

Questions for the "people" "who" utilize the 2 cycle Rotax engine without
oil injection.
Looking for a good MO that you maybe using to keep fuel topped off for
moisture and yet the oil well
Blended with the fuel when the aircraft has sat for a short amount of time.
Of course with the ATV variety
of 2 cycle it's easy to grab the front brake and give it a good shake before
turning on the gas.
Obviously not my first choice to do with my airframe.

Thanks

[Bushy Pete]

Mix up what you are going to use when you want to use it.

Hope this helps,
Peter

"ULWA" > wrote in message
. ..
> Questions for the "people" "who" utilize the 2 cycle Rotax engine without
> oil injection.
> Looking for a good MO that you maybe using to keep fuel topped off for
> moisture and yet the oil well
> Blended with the fuel when the aircraft has sat for a short amount of
> time. Of course with the ATV variety
> of 2 cycle it's easy to grab the front brake and give it a good shake
> before turning on the gas.
> Obviously not my first choice to do with my airframe.
>
> Thanks
>
>

[Barnyard BOb]

On Tue, 3 Oct 2006 21:19:48 -0700, "ULWA" >
wrote:

>Questions for the "people" "who" utilize the 2 cycle Rotax engine without
>oil injection.
>Looking for a good MO that you maybe using to keep fuel topped off for
>moisture and yet the oil well
>Blended with the fuel when the aircraft has sat for a short amount of time.
>Of course with the ATV variety
>of 2 cycle it's easy to grab the front brake and give it a good shake before
>turning on the gas.
>Obviously not my first choice to do with my airframe.
>
>Thanks
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Dunno what "MO" means fer sure.
I'll assume the latin... modus operandi.

Not being a petro chemist or engineer, but....
once mixed, I've never had a mix 'unmix'.

Not to start a possible 'firestorm', but....
shelf life after mixing is a concern to those
that care not to just roll the dice and fly.

If one takes to heart what Rotax has to say,
you're playing russian roulette if you don't use
the correctly engineered oil for the application, too.
What would that be, you might ask?
Whatever Rotax recommends. :o)

.. Kindly remember....
If you get your ass stuck in a tree from any advice
garnered here, *YOU* brought it on yourself.

Double layer asbestos underwear buttoned up.


.. - Barnyard BOb -

Never re-elect a politician.

[stol]

I have several 2 stroke Rotax motors in various snowmobiles. In all of
them I run Klotz super techniplate with the castor oil additive. On
the stock ones I run 35-1 premix and use 92 octane gas. The oil has
never come out of suspension in the fuel over the summer, in fact the
gas will go stale first so I always top of the tanks with 100 LL at the
end of the season and that keeps the fuel fresh for the following
winter. On the mod stock sleds I run them at 30-1 and all other specs
stay the same. On my Open Mod 670 racing sled, it runs on alky and
nitro, that means I have to flush the motor after each race to prevent
the fuel from destroying the motor so the oil staying in suspension is
not an issue. I do run the same oil though, but at 20-1.

Ps. I do like BOb's sig line of " never re-elect a politician"....
Soooo true.....

Ben
www.haaspowerair.com
ULWA wrote:
> Questions for the "people" "who" utilize the 2 cycle Rotax engine without
> oil injection.
> Looking for a good MO that you maybe using to keep fuel topped off for
> moisture and yet the oil well
> Blended with the fuel when the aircraft has sat for a short amount of time.
> Of course with the ATV variety
> of 2 cycle it's easy to grab the front brake and give it a good shake before
> turning on the gas.
> Obviously not my first choice to do with my airframe.
>
> Thanks

[UltraJohn]

Barnyard BOb wrote:

> On Tue, 3 Oct 2006 21:19:48 -0700, "ULWA" >
> wrote:
>
>>Questions for the "people" "who" utilize the 2 cycle Rotax engine without
>>oil injection.
>>Looking for a good MO that you maybe using to keep fuel topped off for
>>moisture and yet the oil well
>>Blended with the fuel when the aircraft has sat for a short amount of
>>time. Of course with the ATV variety
>>of 2 cycle it's easy to grab the front brake and give it a good shake
>>before turning on the gas.
>>Obviously not my first choice to do with my airframe.
>>
>>Thanks
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> Dunno what "MO" means fer sure.
> I'll assume the latin... modus operandi.
>
>>
> . - Barnyard BOb -
>
> Never re-elect a politician.
Huuuum I was thinking Motor Oil! I guess your interpretation makes as much
sense, maybe the OP will clue us in ! [-)

John

[ULWA]

Thank you for the reply's. And Yes... MO = method of operation.
Aviation has way to many Abbr. and Acronyms to be adding to them and
confusing some here. I will keep them to a min.
After years of running 2 strokes, it was always a habit to give the tank a
good shake before
opening the gas. Didn't say it was a good habit....
If oil suspension has not become a concern or problem with the UL rotax's.
I can shorten my preflight list alittle bit for the short rest periods
anyways.
And take the little more uneven ground out to my preflight runups : )

Thank you for your inputs


..

"stol" > wrote in message
oups.com...
>I have several 2 stroke Rotax motors in various snowmobiles. In all of
> them I run Klotz super techniplate with the castor oil additive. On
> the stock ones I run 35-1 premix and use 92 octane gas. The oil has
> never come out of suspension in the fuel over the summer, in fact the
> gas will go stale first so I always top of the tanks with 100 LL at the
> end of the season and that keeps the fuel fresh for the following
> winter. On the mod stock sleds I run them at 30-1 and all other specs
> stay the same. On my Open Mod 670 racing sled, it runs on alky and
> nitro, that means I have to flush the motor after each race to prevent
> the fuel from destroying the motor so the oil staying in suspension is
> not an issue. I do run the same oil though, but at 20-1.
>
> Ps. I do like BOb's sig line of " never re-elect a politician"....
> Soooo true.....
>
> Ben
> www.haaspowerair.com
> ULWA wrote:
>> Questions for the "people" "who" utilize the 2 cycle Rotax engine without
>> oil injection.
>> Looking for a good MO that you maybe using to keep fuel topped off for
>> moisture and yet the oil well
>> Blended with the fuel when the aircraft has sat for a short amount of
>> time.
>> Of course with the ATV variety
>> of 2 cycle it's easy to grab the front brake and give it a good shake
>> before
>> turning on the gas.
>> Obviously not my first choice to do with my airframe.
>>
>> Thanks
>

[Barnyard BOb]

On Thu, 5 Oct 2006 20:32:55 -0700, "ULWA" >
wrote:

>Thank you for the reply's. And Yes... MO = method of operation.
>Aviation has way to many Abbr. and Acronyms to be adding to them and
>confusing some here. I will keep them to a min.
>After years of running 2 strokes, it was always a habit to give the tank a
>good shake before
>opening the gas. Didn't say it was a good habit....
>If oil suspension has not become a concern or problem with the UL rotax's.
>I can shorten my preflight list alittle bit for the short rest periods
>anyways.
>And take the little more uneven ground out to my preflight runups : )
>
>Thank you for your inputs

There are certain additives that can settle out
of a pre-mix. I've just never run into the problem,
myself. So... shake away. The worst that can
happen is you get a hernia! :o)

Any setting out of additives probably takes more than
three weeks... which should have you thinking about
limiting this OLD fuel to your lawnmower, snow blower,
jet ski, etcetera.

Why....?

Straight from....
http://www.rotaxservice.com/rotax_tips/rotax_feed2.htm

Fuel
Octane rating

We recommend using a "premium" type automotive fuel with an octane
rating of 91, a minimum of impurities and little or no alcohols
(maximum 5%).

Some may have noticed that the Rotax documentation specifies an octane
rating of 90, based on the RON standards used in Europe. This is the
equivalent of an 87 rating under the Canadian AKI standards. A rating
of 87 is indeed considered "regular" fuel, but we still recommend a
"premium" fuel for two reasons:

First, when fuel is premixed with 2-stroke oil, the octane rating is
reduced by about 2 points. An 87 octane fuel would therefore become 85
octane.

Second, fuel evaporates and loses its octane rating when it lays in
your aircraft's fuel tank or in a plastic jug. A "premium", 91 octane
fuel will see its octane rating reduced to unusable levels after as
little as three weeks. Fuel with a lower octane rating would obviously
have an even shorter usable life.

- Barnyard BOb -

“Politics is the only job where the more experience you have, the
worse you get at it. I say never re-elect anybody, including me.”
- Kinky Friedman - Texas Gubernatorial candidate -

[ULWA]

Thank you again for your time and information.



"Barnyard BOb" > wrote in message
...
> On Thu, 5 Oct 2006 20:32:55 -0700, "ULWA" >
> wrote:
>
>>Thank you for the reply's. And Yes... MO = method of operation.
>>Aviation has way to many Abbr. and Acronyms to be adding to them and
>>confusing some here. I will keep them to a min.
>>After years of running 2 strokes, it was always a habit to give the tank a
>>good shake before
>>opening the gas. Didn't say it was a good habit....
>>If oil suspension has not become a concern or problem with the UL rotax's.
>>I can shorten my preflight list alittle bit for the short rest periods
>>anyways.
>>And take the little more uneven ground out to my preflight runups : )
>>
>>Thank you for your inputs
>
> There are certain additives that can settle out
> of a pre-mix. I've just never run into the problem,
> myself. So... shake away. The worst that can
> happen is you get a hernia! :o)
>
> Any setting out of additives probably takes more than
> three weeks... which should have you thinking about
> limiting this OLD fuel to your lawnmower, snow blower,
> jet ski, etcetera.
>
> Why....?
>
> Straight from....
> http://www.rotaxservice.com/rotax_tips/rotax_feed2.htm
>
> Fuel
> Octane rating
>
> We recommend using a "premium" type automotive fuel with an octane
> rating of 91, a minimum of impurities and little or no alcohols
> (maximum 5%).
>
> Some may have noticed that the Rotax documentation specifies an octane
> rating of 90, based on the RON standards used in Europe. This is the
> equivalent of an 87 rating under the Canadian AKI standards. A rating
> of 87 is indeed considered "regular" fuel, but we still recommend a
> "premium" fuel for two reasons:
>
> First, when fuel is premixed with 2-stroke oil, the octane rating is
> reduced by about 2 points. An 87 octane fuel would therefore become 85
> octane.
>
> Second, fuel evaporates and loses its octane rating when it lays in
> your aircraft's fuel tank or in a plastic jug. A "premium", 91 octane
> fuel will see its octane rating reduced to unusable levels after as
> little as three weeks. Fuel with a lower octane rating would obviously
> have an even shorter usable life.
>
> - Barnyard BOb -
>
> "Politics is the only job where the more experience you have, the
> worse you get at it. I say never re-elect anybody, including me."
> - Kinky Friedman - Texas Gubernatorial candidate -
>
>
>
>
>
>
>
>