On 19/12/2013 10:18 AM, Mike Borgelt wrote:
At 07:14 AM 19/12/2013, you wrote:
I have been using Shell 98 for 12 months since I purchased my Rotax
912S Ximango and have no clear fuel lines to look at; they are all
covered or aluminium. I have no fuel leaks and have metal tanks. The
aircraft manual specifies Avgas 100LL!
PeterS
So why not use Avgas 100LL?
http://www.rotaxservice.com/rotax_tips/rotax_feed4.htm
*Aviation Fuels*
It is possible but not recommended to use 100LL AVGAS, since the the
lead content is like cholesterol to your engine: it will accelerate wear
on the valve seats, create deposits in the combustion chamber and
sediments in the lubrication system and gearbox. Increased maintenance
is necessary to compensate. Unlike "conventional" aircraft engines, lead
is absolutely not essential to the proper lubrication and operation of a
Rotax 4-stroke aircraft engine. The increased octane rating also has no
marked advantage for the operation of your engine.
*To be avoided:*
* "Regular" fuel except if used in the 912 A/F/UL and burned entirely
on the day of purchase;
* "Premium" fuel which is more than 3 weeks old
* AVGAS except when the required automotive fuel is not available
<http://www.rotaxservice.com/rotax_tips/rotax_feed4.htm#>PeterS
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