On Fri, 13 Nov 2009 06:40:40 -0500, firstname.lastname@example.org wrote:
Well you are talking to the wrong person if you are expecting someone
to believe rate of burn, or rate of combustion has anything directly
to do with octane.
A FASTER burnig fuelis actually LESS likely to detonate, because the
"end gasses" of combustion are exposed to high heat and pressure for a
shorter time, and therefore are less likely to dissassociate and turn
into unstable radicals, which then "detonate" in the cyl.
High octane is NOT to make the "fuel" burn slower. It is to prevent
the "fuel" from breaking down into unstable compounds which "explode"
in the cyl.
That I KNOW for a FACT.
TEL and other octane enhancement chemical additives in fuel act as
"anti-catalysts" to prevent that breakdown or disassociation.
That is all myth to me. I took out my John Deere mower I shut down last
fall(I ran it until it quit running out of gas) fill some fresh regular
gas, it started in two pulls. I always store 2 or 4 cycle tools
after gas runs out. My chain saw when I need it feel fresh mix and it
always starts within couple pulls. Weed eater is same. I don't do any
thing special other than that.
My chain saw has a pressurized (sealed) fuel tank and even if I leave
it for 2 years it always starts on about the second or third pull.
The weed eater and leaf blower are another story!!! No sealed tanks,
and hard enough to start after 2 WEEKS of sitting.
Running them once a month would work but I'll never do that and many
ABSolutlely. It's worked great for me. I used to make sure the last
two fills had stabil, because some gas from the next to last fill up
mixes with the gas from the last fill-up and who knows what makes it
into the tube to the carburertor bowl or other carburetor parts. But
I never know when lawnmower season will end so now I just use it all
I don't think that matters.
That certainly doesn't matter.
The only reason to use high octane is if an engine is knocking and
lawnmowers are not high enough compression to knock with low octane
gas, and in addition, I've read that knocking due to low octane
doesn't hurt the engine.
Is your lawnmower knocking? (It sounds something like knocking on a
door) If not, you have no use for either higher octane gas or lead
substitute. If you think it is, what engine do you have, brand, size,
They probably say to drain the gas and then run it until the engine
stops. I think they should mention Stabil too. I can't help but
think that is better, because, tell me folks, when the engine stops,
there is still more tahn half a bowl of gas left in the carburetor
After all, with a full carburetor bowl, the gas level in the bowl and
the related venturi tube, or whatever it's called, is just below
ovverflowing and a little bit of vacuum sucks it up, but if it drops
even less than a quarter inch, the engine won't run.
There are probably similar problems, I mean issues, with non-bowl
Or do they say to disassemble the bowl and drain that too? I don't
So I use regular gas (ideally without ethanol), with no lead
High octane and lead substitute are simply a waste. (I don't use
Premium in my cars.) I use fuel stabilizer if I'm going to leave the
tank with gas in it for a few weeks without running the engine.
That's easy. Thanks!
I'm surprised no one has suugested RTFM. Most manuals I've read
these days say to drain/run the engine dry prior to storage. I do
that with my snow blower. With my mower, I just add Sta-Bil to the
last two gallons of gas that I buy. That way it will be in the mower
whenever the last cut happens to be and I store it that way.
My reasoning with the mower is that it's stored for a shorter perioed,
about 4 months vs 9 for the snowblower. I've also only used regular
gas, no additives. I agree with the advice that a higher octane isn't
going to harm the engine and that if you can find alcohol free gas,
that would be good, but I don;t know where you would find it here in
In the US, the government stepped in long ago and makes sure all grades
and brands of gasoline have cleaning agents and are not supposed to need
any other store bought additives. How often do you hear about actual
clogged fuel injectors these days? I've never had a clogged fuel
injector and I use the cheapest 87 octane I can find. I don't know of
anyone in the last ten or more years that has had a clogged fuel
injector. Do you?
I think you're right. When fuel injectors started to be universal,
there was a fight between the gasoline companies and the car
companies. The car companies would only recommend a few gasoline
companies that had sufficiently filtered gas that woudn't clog the
injectors. The gas companies said the injectors should be made better
(although I personally don't know how) I presume the gas companies
lost and they all had to make gas that would work with fuel injectors.
Fuel injectors were necessary to get the gas mileage that the law
required. Because gas could be dispensed in amounts more suited to
the need of the moment, and not just plenty all the time.
Neither have I. I use injector cleaner when I'm having a problem but
I don't know for sure it's ever helped. The last time was recently
and it didn't help now I thihk the problem was one spark plug wire
wasn't on well.
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