Re: rec tech mower

On Fri, 11 Apr 2025 23:41:58 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:

On Sat, 12 Apr 2025 13:05:24 +0700, John B. <slocombjb@gmail.com>
wrote:
>
(chomp)

As an aside, most of the problems with small engines being stored for
long periods of time can be caused by the fact that much "Gas Station"
gas contains Ethanol. It's worth it to search for "pure gasoline" gas.
https://www.buyrealgas.com/states.html
https://www.pure-gas.org/

>
True.  Here's a video that explains what's happening:
>
"The Ugly Truth Why Gas Station Fuel Is Bad For Small Engines"
<https://www.youtube.com/watch?v=Wvps2gF0Sdo>
>
I wasted some time and effort trying to remove the ethanol from retail
gasoline.  It can be done, but the results are not very good.  The
problem is that ethanol is an octane booster.  Take away the ethanol
and the octane rating of the gas goes down.  If I start with regular,
the octane rating ends up so low that the engine might knock.
Actually, modern engines change the timing advance so that the engine
just barely knocks.  It doesn't ping and sorta runs, but not very
well.
>

I believe that some airfields that cater to old fashioned propeller
airplanes may also stock it.

>
<https://en.wikipedia.org/wiki/Avgas#93UL_(Ethanol-free_93AKI_automotive_gasoline)>
Ethanol free gas in a car probably won't hurt the car engine. However,
there is no authoritative consensus as to whether it's a good or bad
idea.  Try sampling some articles on the topic:
<https://www.google.com/search?q=using%20ethanol%20free%20avgas%20in%20car>
I have little experience and no opinion.

Try Aviation gasoline and perhaps gasoline used in any "gasoline only"
fueled racing.

Part of the power of an internal combustion engine comes from the fuel
ignition occurring before the piston reaching maximum compression thus
ensuring, do to the tiny burning time of the fuel,  that the maximum
driving force is applied to the piston for the longest possible
distance.
--
Cheers,

John B.