Referring to https://chromium.github.io/octane/
How can my js know, at run time, the performance of its environment?
Interactively, I use Octane, but via code I am fine with any reasonable proxy for that value. IOW how can I measure js performance at run time from my js ?
Jonesome
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Browse other questions tagged javascriptperformance or ask your own question.posted 3 years ago
Dear All,
I have a new Husqvarna chainsaw. The dealer said NOT to use fuel over 95 octane because it will run too hot and hurt the engine. Another dealer suggested several times that I go to the local airport and get their gas (no ethanol, 105 octave) to which I can add the proper ratio of oil and that it will NOT hurt the engine. Do you have any experience with this? Thanks for your time. ML in MD.
Location: Northern Maine, USA (zone 3b-4a)
posted 3 years ago
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I've heard of people using it but mixed 1/2 w/ 87 oct. strait up will burn your saw up for sure. can use trufuel if you want ethanol free but its not cheap. then again neither is the av gas!
Location: Mid-Michigan
posted 3 years ago
I think the second guy was telling you that not because of the octane, but because of the ethanol.
Location: Northern Maine, USA (zone 3b-4a)
posted 3 years ago
I'm lucky i live on the canadian border. their 93oct. is ethanol free. with the exchange and can. tax its about $4 american a gal. worth it to me as i don't have to treat it and its good for a year before it starts to degrade. trufuel or similar ethanol free would be my next choice. ethanol in gas sucks! esp. in the cold weather up here!
pollinator
Location: Wisconsin, zone 4
posted 3 years ago
Premium gas here doesn't have ethanol and it's the only thing I'll use in any of my small engine equipment. Ethanol truly does suck. I have had it gum up more carbs than I can count and makes me very angry to have to rebuild a carb before I can use my equipment that sits for any length of time.
'People may doubt what you say, but they will believe what you do.'
Location: Northern Maine, USA (zone 3b-4a)
posted 3 years ago
i feel your pain! cost me one blown chainsaw and over a $1000 spent to mechanics to get my other equipment running again! not very mechanically savvy unfortunately.
Location: Jacksonville, FL
posted 3 years ago
Octane rating is more of a measurement of how fast a fuel burns and the auto-ignition temperature. The higher the number, the slower burning/higher auto-ignition temperature. Many people think high octane means hotter or more powerful and that isn't quite true. It is capable of being used in a higher compression engine without reaching auto-ignition (pinging, detonation) which means you can make a more powerful engine (higher compression ratio - higher performance), but it doesn't work magic on an engine vs using lower octane rating (note: rating, pure octane is supposed to burn at 100 and the rating compares the gasoline to this, depending on the testing method of course).
Using fuel with too high of an octane rating would be more likely to cause incomplete combustion which would mean more pollution, more deposits of unburned fuel sticking to components, and lower combustion temperatures. Having these deposits build up can cause engine problems, and cause the engine to retain heat if you do get the engine running hotter using a lower octane rating fuel at a later time. I would look up the specific information for the engine online and follow those guidelines. Going with fuel that has a slightly higher octane rating will likely only have the negative effect of being more expensive. Going with too low of an octane rating can cause pre-ignition/pinging/detonation and bust the piston or other internal engine parts. If you have a race track or drag strip near you then it might be an idea to look there for ethanol-free fuel. Ethanol increases the octane rating of fuel, but it and other additives can have drawbacks such as being incompatible with certain fuel systems and causing damage, not as friendly to being stored for long periods, and problems in extreme temperatures. It honestly might be cheaper to offer some of your fuel to a neighbor and go through it more frequently than to have it sit around for a few years and damage your equipment. Being certain to empty the fuel system before extended periods of storage/non-usage will help keep the fuel system clean.
posted 3 years ago
Location: Northern Maine, USA (zone 3b-4a)
posted 3 years ago
Dana Jones wrote:We just buy the quart of fuel at Lowes.
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thats your safest bet if you don't have access to ethanol free gas. posted 3 years ago
Micah:
I have been investigating fuel, repair issues and various brands and types of chainsaws for several weeks now and your post brought up an option I had not yet come across. I wonder if you have heard of the website: pure-gas at org which helps people locate stations that sell ethanol-free gas? Finding a station within easy driving distance of us in WV and PA should make a huge difference in the amount of fuel-related issues we have with our small engines from now on! I hope you can find a location that is reasonable for you. Using ethanol-free gas will save you a pile over pre-mix by the quart. Good luck with your chainsaw! What model did you settle on? GG
Location: South Tenerife, Canary Islands (Spain)
posted 3 years ago
use the fuel the manufacturer specifies. Using a lower or higher rating will not aid performance. A lower octane may destroy your energy, and a higher octane is just a waste of money but will absolutely not burn hotter or give more power.
How To Run Octane Servers
gardener
Location: Vilonia, Arkansas - Zone 7B/8A stoney, sandy loam soil pH 6.5
Best Gpu For Octane Renderposted 3 years ago
I don't have access to ethanol free fuels that I would use in my small engines.
What I do is treat the fuel to stabilize it then I use 1 gal. and 2 gal. containers for mixing the oil and fuel. In the three years I've been doing this I have not experienced any issues. I do this for my boat's motor as well and I have not had any issues with it either. I have access to AV gas both green and blue but the only thing I use those in is my Jeep with a High compression engine, it simply runs better and gets better mileage with the 100 oct. (green) fuel. The blue (110 oct.) fuel runs just fine in this engine but it is a bit of overkill since my compression ratio is only 12:1 110 octane is really for 14:1and 15:1 ratios . I had a friend that wanted to get 'Jet Fuel' for his automobile. I had to tell him that I didn't think his vehicle would like kerosene to run on. I flew fighters in the Navy, most people have no idea that 'Jets' run on kerosene not gasoline.
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Location: Northern Maine, USA (zone 3b-4a)
posted 3 years ago
Gene Green wrote:Micah:
I have been investigating fuel, repair issues and various brands and types of chainsaws for several weeks now and your post brought up an option I had not yet come across. I wonder if you have heard of the website: pure-gas at org which helps people locate stations that sell ethanol-free gas? Finding a station within easy driving distance of us in WV and PA should make a huge difference in the amount of fuel-related issues we have with our small engines from now on! I hope you can find a location that is reasonable for you. Using ethanol-free gas will save you a pile over pre-mix by the quart. Good luck with your chainsaw! What model did you settle on? GG
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i run a husquavana ! i don't have a ethanol free option unless i go to canada. ethanol bites!
WARNING - For the users of 2 cycle engines: CHECK YOUR FUEL SOURCES ! I was buying gas at a local Hess station, and happened to glance at a tiny new(1'x2') label on the pump. It read: 'This product contains 10% Ethanol, for use as a motor fuel only' This is Gasohol! Gasohol is lethal stuff for lean mix 2 cycle engines, as the ethyl alcohol destroys the lubricity of the oil in 2 cycle gas. A 16:1 mix engine might survive an encounter with this 'contamination', but a 32:1 of a 40 - 50:1 would probably sustain damage form insuffecient lubrication, using this fuel.
For the 4 cycle engine users (you 2 stroke guys too), Gasohol is hydroscopic - that is, it attracts moisture. If you have a partially filled steel tank, or gas can, this fuel will attract more moisture than usual, leading to rust. Also, even in a plastic tank, the moisture in the air will degrade Gasohol's performance rapidly, due to the ethanol's moisture attraction. I do not know if fuel stabilizers work as well in Gasohol either, due to the fact that the alcohol has a higher evaporative rate than gas alone. If you use Gasohol in an auto or truck, you will get a 10% loss of engine power, as well as up to a 20% loss of fuel economy. My 1996 Dodge truck, with the 5,2 L V8 went from 15 MPG to 11 MPG, using the same brand of fuel, before the change over/ after the change over. I had thought it was an engine problem, but after switching brands (regular gas), the milage went back to the 15 MPG after a few tank fills. In most states, Gasohol must be plainly labeled, I guess that NJ is not one of them. Andrew
Just FYI on a pet peeve of mine.
I often hear this claim, or see people putting 'Supreme' in their Regular Unleaded auto.. You might ask yourself what's wrong with this? Isn't a higher octane rating automatically better? Well.. no, it isn't. This is how internal combustion engines work (again, in the spirit of FYI, we all have to learn somewhere, and it doesn't make you dumb just because you made what seems to be a perfectly good assumption on the surface): On your 'compression stroke' gas and air are compressed in the cylinder by the piston. A bit before 'top dead center' (usually), your spark-plug fires. The resulting explosion of gasses creates the 'power stroke' that turns your crank-shaft/wheels. The difference in octanes is a difference in burn-rates. Higher octanes burn slower. What? That doesn't sound good for power.. why would I want that? Here's why: One of the best ways to make more power is to raise the level of compression during the compression stroke. Typical levels might be around say 10:1. You could get up to a stratospheric 13:1 though. (In motorcycles) An average German auto might have an 11:1 compression ratio. What's the point? Well, as you compress the gas/air mixture more, it becomes more volatile and can explode without a spark! This is called 'detonation'. It's a very bad thing for gasoline engines. Diesel engines rely on detonation, which is one of the reasons why diesel fuel is so much less volatle. If you were to put gasoline into a diesel engine, or run a gasoline engine with too high a compression ratio for the gas, it would be like running your car on straight nitrous oxide. It'd burn a hole in your pistons in seconds, and don't be surprised if connecting rods fly out the bottom of the oil pan, or up through your hood. So the point of higher octane, slower burning fuels, is to avoid detonation when raisin compression to achieve more power. How does this relate to your average Ford Focus? Well, since the higher octanes burn slower, you have to spark them earlier to make sure they completely burn. This is what people talk about when you hear 'ignition advance'. You advance the sensor or distributor in order to get the spark-plugs to fire sooner in the compression-stroke. Now after hearing all this, you can probably see the problem.. 1: If your car isn't designed or modified for higher-octane fuels, you're actually going to be hurting power using higher octane gasses since the slower burning mixture doesn't have time to burn completely and can actually work against the power-stroke in the following exhaust stroke. 2: Not only that, but the unspent gasses that don't get burned translate directly to 'carbon buildup' on your sparkplugs, making them go bad sooner. The unspent gasses carbonize, turning into black powder, which then coats your spark-plugs, dirties your vales, and your piston rings. Over time this (excessive carbon deposits) can lead to damaged spark-plugs, compression losses from cylinder wall wear causing your engine to burn oil and loose power, etc.. So using the wrong Octane rating is not a good idea in your average daily-driver. Your engine will last longer and have more power if you use the recommended octane. Of course, in autos that recommend higher octane fuels, make sure and use them, because the danger is even more potent there. What if your older car seems to run better with higher octanes? Well, there's any number of things that could cause this, but it's usually weak spark. Change your spark-plugs, replace the wires, and on older vehicles service or replace the points in your distributor. Be aware that the higher octane fuel isn't helping (if your car wasn't made for it), it's slowly making the problem worse. Of course if your spark is so weak it's not firing, you should probably take the higher carbon over the detonation. And that, is that.. feel free to add/correct anything you see here..
My manual says to run 91 or greater octane, so I've religiously run 93 octane Texaco gas. Recently I was low on gas and there were no gas stations around other than a 76 and they only had 91 octane fuel. After filling up I noticed that my motorcycle was running significantly smoother. There are no longer any sudden drops in rpm, and my engine rpm stays even throughout the powerband.
Is it smoother because I'm using closer to the recommended octane? Or is this because of the quality of the gas? I had always assumed that using a higher octane wouldn't have a noticeable difference in performance, but it sure did (for the worse).
Motorcycle: 2017 Yamaha R6 (Factory recommended minimum octane is 91)
Weather/Temperature: Hot and humid
Elevation: Sea level
Mocking
MockingMocking
2 Answers
Lower octane will cause the engine computer to reduce timing advance with could cause a smoother running with some loss of performance. All top tier means is they have detergent additives that non top tier do not.
MoabMoab
One thing to consider would be to buy the gas that will be consumed in the shortest amount of time by customers.
If you purchased 93 octane (which probably means (RON+MON)/2, i.e. about 98 RON), this is a premium gas that most customers won't purchase due to its price. The turnover for the gas is low, and therefore, you get relatively old gas.
If you purchased 91 octane (which probably means (RON+MON)/2, i.e. about 96 RON), this is a gas that more customers will purchase than the 93 octane. For this gas, the turnover will be higher, and therefore, you get somewhat more recent gas than for 93.
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My advice is simple: get the lowest recommended octane number within certain sane limits. Not only you save money, but also the gas will be more recent due to higher turnover.
For this reason, I choose 95 RON (with at most 10% ethanol) for my car. There is a 98 RON (with at most 5% ethanol) here for more picky cars, but many storage facilities were installed when there was a mass hysteria about the ethanol content of 95 RON (high temporary demand for 98 RON and large 98 RON storage facilities in the fuel stations), and now the mass hysteria seems to have ended, meaning the turnover is very low for the size of the 98 RON storage facilities.
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Selecting where you refuel will also help. I always refuel at Neste (I'm in Finland), because I believe their gas has higher quality.
juhist
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