Re: Using 100LL in a Rotax 912 Engine

[Kevin McCue]

Be sure that you have the updated gears in the prop reduction. As a result
of the engine oil circulating in the PRSU, there was a service letter about
lead build up on the gears causing spalling when running 100LL.

--
Kevin McCue
KRYN
'47 Luscombe 8E
Rans S-17 (for sale)




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[Martin Hellman]

"Terry Ladouceur" > wrote in message >...
> I know that the Rotax 912 is to be run on Mogas but I have heard that there
> is a gasoline additive you can purchase that will help reduce the lead build
> up when being used in a Rotax 912 Engine. Does anyone on this list know what
> this additive is called? Have you used it and what kind of results did you
> have? Any negative impact on your engine? Thanks.

A bigger issue may be the impact of Mogas and any possible additives
like TCP on your fuel system. I have fiberglass tanks that are coated
with a 3M slosh compound that dissolves (and gums your carburetors) if
there's any alcohol in the fuel. I know alcohol is a no-no in aviation
fuel anyway, but other owners - even those who checked pretty
carefully - sometimes got alcohol and gummed carbs. Not to mention who
knows what damage to the fuel tanks. There have been other incidents
as well where there is evidence that anything other than 100LL (which
the factory tested extensively on the entire fuel system) may be
causing problems. I'd love to use unleaded fuel and make my engine
last longer, but have decided to stick with 100LL for the above
reasons. Some other owners have opted for Mogas, so it's not like my
decision is clearly the right one. But I thought it was worth
mentioning the issue of fuel system damage.

Good flying to you all,
Martin

[G.R. Patterson III]

Kevin McCue wrote:
>
> Easy to check for alcohol in fuel. Put a small quantity of water in a
> jar. add some "suspect" fuel. Cap and shake. Let settle. If water has
> disappeared alcohol is likely.

The water will not disappear. Put the water in and mark the level. Then add
the fuel and shake. Let the water settle back out. If the water level is now
higher, there's alcohol in the gas.

George Patterson
Brute force has an elegance all its own.