I have some naphthalene moth balls which are basically pure naphthalene. Naphthalene sublimes from solid crystals to vapour with no liquid phase and no residue. it also dissolves in gasoline. It is quite effective in dissolving high molecular weight organics that can mess up small orifices such as in carbs. So I crush one mothball, add to 20 L of gas in a jerry can for use in outboard motors, lawn mowers, and other small gas engines. I use fuel stabilizer for long term storage like over winter in my lawn tracker and i shut off the fuel supply and drain the carb. My little Honda 2.3 started second pull on gas left in its tank all winter. If you decide to try this make sure the moth balls are the naphthalene type.
On Sat, Jun 13, 2020 at 12:10 PM Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > Bruce, > > I too have NOT been made aware of Supreme/93 octane being made by default > without ethanol. The octane rating is often achieved by simply adding > toluene. I've even seen plans for toluene injection systems designed for > performance vehicles. As I understand it the octane doesn't add power or > BTUs/gallon but rather changes the likelihood of combustion due to the heat > of compression (ping/pre-detonation). I'll look for a better explanation > and post back. > > Anecdotally, I exclusively use 93 octane in ALL my applications and I have > had small engines with what seem to be trouble due to "stale" gas. In many > cases they had had previous owners so it is unknown exactly what caused the > problems or if it was simply age related. The latest was a chainsaw which > was ~30 years old (my late father's). I didn't perform an autopsy but just > simply replaced the carb. During the replacement I found all of the rubber > parts to be in remarkably good condition with the exception of the impulse > fuel line which kinda disintegrated upon removal. > With the Mantis Tiller I've shown before, I found the rubber diaphragms to > be cracked and taking a set. Again, previous owners could have done > anything so who knows. I've also had two 5Hp Briggs and Stratton engines > which sat for years with old gas in the carb. They had clear signs of > deposits and varnish which degraded their performance until it was cleaned > up. These 2 specific engines were in my care (or lack there of) since > new. I don't buy low octane gas so the octane could not have simply been > the cause. > > As a side note the first 2 engines were 2 stroke and the second 2 were 4 > stroke. My diagnosis is that each pair may have experienced 2 different > failure mechanisms. In the first 2, the degradation of the rubber and > plastic-ish parts. This is consistent with ethanol related failures. In > the second 2, it appeared that varnish/deposits had developed and clogged > the small ports and orifices. This is consistent with allowing the gas to > remain in the system and ultimately evaporating, leaving behind the > normally low concentrations of non-volatile substances as deposits. This > effect is what I believe makes up the varnish. In cleaning these deposits > I found that carb cleaner was more or less ineffective and that mechanical > removal was necessary. > > Oddly, I believe that both of these failure mechanisms can be prevented by > "running out" the fuel when done using the equipment. Don't just turn of > the engine but rather starve it out by shutting of the gas. There may be > something to be said about the oil in 2 stroke fuel helping to prevent > evaporation and the formation of deposits. Who knows. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > On Sat, Jun 13, 2020, 10:16 bwhitmore via CnC-List <cnc-list@cnc-list.com> > wrote: > >> I don't agree, at least here in the U.S. that premium gas doesn't have >> ethanol in it. There are, however, gas stations that have a pump >> reserved for non-ethanol gas. >> >> Bruce >> >> >> >> Sent from Samsung tablet. >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > -- Sent from Gmail Mobile
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