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Since it's SAE (Society of Automotive Engineers) that sets the testing standards for Octane ratings, the fact of the matter is slightly different.
It's a combination of vapor point, energy the fuel carries and the flash point that matters in a vehicle engine.
The higher the compression ratio the more energy you will realize from the combustion process.
Lower temprature flash point fuels will not take the high compression without detonation, and what you are looking for is COMMANDED ignition.
Also, vapor point is a big issue,
You want the fuel to be atomized droplets, not vapor.
Vapor doesn't burn efficiently, it 'Flashes' and doesn't raise the cylinder tempurature consistantly and evenly as atomized fuel.
Any modern vehicle that can decide to increase timing rates with better fuel (no detonation) will show an increase in fuel economy/mpg since the engine doesn't have to use as much fuel to do the same amount of work.
Higher octane fuels also burn cleaner, less varnish, byproducts, ect. since it's further refined and tighter controlled.
I use Avation Gasoline in my lawn mowers, ect. at the end of the season because it doesn't gum up like regular motor fuel does.
Much more resistant to vapor losses and much cleaner.
Just something there from the mechanics viewpoint...
i have a honda civic 2001 my manual says to put unleaded 86 or higher, but my question is that here where i live we dont have 86 we have 87, 89, 93 which of all these 3 should i use and it would hurt my engine if i use the one that is not recommended, thanks
86 is the MINIMUM. Running 86 with today's engines can cause damage!
The higher the octane, the higher the ignition point. Lower octane can burn hotter.
you have NO idea what you are talking about ,,ha,,, sure if you buy octane booster and rum 105 octane in a ford escort you might burn some valves,,, but any grade sold "over the counter..good gas station is fine,, might even help older cars with pinging and cleaning the valves,,,
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No, you will not get better millage using higher octane than what the MFG call for. Octane requirments fallow compression the higher the compression ratio the higher the octane that is required.
Using 86octane will not harm a engine designed to use 86 octane.
Next the higher the octane the hotter and slower the gas burns as it posses more energy
Low octane burns fast and cooler, as it posses less energy.
Quote:
Originally Posted by RJARRRPCGP
86 is the MINIMUM. Running 86 with today's engines can cause damage!
The higher the octane, the higher the ignition point. Lower octane can burn hotter.
Why doesn't your AV gass gum up the works.
because
1. It lacks any ethanol
2. It does not receive the same additive package automotive gas does.
3. it doesn't vaporize as easily at cool or warm temps because it lacks ethanol that evaporates at a muck lower point.
4.It is very dry and it can harm your small 4 stroke engines.
just something from a reality ,,, stand point
Quote:
Originally Posted by MetalGrinder
Snofarmer,
I use Avation Gasoline in my lawn mowers, ect. at the end of the season because it doesn't gum up like regular motor fuel does.
Much more resistant to vapor losses and much cleaner.
Just something there from the mechanics viewpoint...
Octane Facts
•
Knock occurs when cylinder pressures are high. It is normal for an engine to ping a little at full throttle
because cylinder pressures are very high at full throttle. Engine knock, however, should not be ignored
since it can result in serious damage to the engine.
•
High octane gasoline burns slower than low octane gasoline. The slow burn prevents engine knock when
cylinder pressures are high.
•
If your engine runs well and does not knock or ping on low octane gasoline, there is no advantage in
switching to higher octane gasoline.
•
If your engine knocks or pings, it does not necessarily mean something is wrong with the gasoline. It could
be a problem with the engine’s electronic control systems, ignition timing or exhaust gas recirculation. On a
high mileage engine, a carbon build-up in the cylinders can increase cylinder pressures and cause knock
•
Almost all of today’s new cars have fuel-injected engines that need to use gasoline with a detergent additive.
They do not necessarily need high octane gasoline with a detergent additive. Generally, new automobiles
need high octane gasoline
only
if the manufacturer recommends it.
•
Always follow the auto manufacturer’s octane recommendations in your owner’s manual.
Octane Myths
•
High octane gasoline improves mileage.
In general, if your car is designed to run on 87 octane gasoline, high octane gasoline will not improve
mileage. If switching to high octane gasoline does improve mileage, you might find that your engine, or its
control systems, need repair.
•
High octane gasoline gives quicker starting
.
No, it doesn’t.
•
High octane gasoline increases power.
If your car is designed to run on 87 octane gasoline, you shouldn’t notice any more power on high octane
gasoline. Again, if it does make a noticeable difference, your engine, or the engine’s electronic control
systems, may need repair.
•
High octane gasoline has been refined more – it is just a better product
.
Additional refining steps are used to increase the octane; however, these additional steps do not necessarily
make the gasoline a “better” product for all engines. They just yield a different blend of hydrocarbons that
burn more slowly. The additional steps also increase the price
No, you will not get better millage using higher octane than what the MFG call for. Octane requirments fallow compression the higher the compression ratio the higher the octane that is required.
Using 86octane will not harm a engine designed to use 86 octane.
Next the higher the octane the hotter and slower the gas burns as it posses more energy
Low octane burns fast and cooler, as it posses less energy.
That's not quite true. Electronic ignitions can change the spark advance based upon fuel performance. I get slightly poorer mileage on mid grade gas than premium.
What is true is that using the gasoline recommended by the people that made the car is best.
If you are trying to get better fuel economy, trying linking your brain to your right foot.
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