Fuel octane selection

GOAL: To assist students in becoming wiser consumers of gasoline and enable them to select the proper octaned gasoline resulting in an energy savings as well as a monetary savings.

2. Costco gas prices marlboro nj Recognize the economic benefit from proper fuel octane selection.

3. How much gas cost for my trip Understand that it takes more raw crude to refine higher octane fuels.


LESSON/INFORMATION: Fuel octane requirements for gasoline engines vary with the compression ratio of the engine; diesel cetane requirements also vary with the compression ratio. Cost of furnace gas valve replacement Engine compression ratio is the relative volume of a cylinder from the bottom most position of the piston’s stroke to the top most position of the piston’s stroke. Average cost of gas per month 2015 The higher an engine’s compression ratio, the greater the amount of heat generated in the cylinder during the compression stroke.

Posted octane numbers on gasoline pumps are a result of testing fuel performance under laboratory and actual operating conditions. How do you calculate fuel cost The higher the octane rating on fuel the less volatile (evaporative qualities) and the slower the fuel burns. Average fuel price 2013 Higher octane fuel contains more POTENTIAL energy but requires the higher heat generated by higher compression ratio engines to properly condition the fuel to RELEASE that higher potential energy. How much in gas will it cost calculator canada In the refining process, fewer gallons of higher octane fuels are yielded from a barrel of raw crude.

If fuel octane is too low for a given compression ratio, the fuel prematurely and spontaneously ignites too early and the fuel charge EXPLODES rather than BURNS resulting in incomplete combustion. How to calculate gas cost The net effect is a loss in power and possible engine damage. Cost gas hours The operator hears an audible “knock” or “ping”, referred to as detonation. Gas cost to travel calculations Detonation may vary from a faint noise on light acceleration to a constant, deep hammering noise while driving at a constant speed. Google maps fuel cost calculator mpg Improper timing adjustments, vacuum leaks, or excessively lean fuel mixtures may also cause detonation.

Many vehicle owners believe that higher octane fuels are better for their vehicles since they are labeled “PREMIUM.” The logic is that since it is a premium fuel it must be better. Costco gas vacaville california In reality, the premium label originates from the higher cost to refine and the resultant higher retail cost. Estimate gas cost for road trip Some refiners label their high octane fuels “SUPER.” Some owners think that these fuels will make their vehicles more powerful. Lap band surgery south africa Only engines with high compression ratios can deliver all the potential energy from higher octane fuels! Always consult the manufacturer’s octane recommendation to determine the proper octane requirements for any given vehicle. Petrol fuel cost calculator Generally, engines with compression ratios of 9.3 : 1 or less will safely operate with unleaded 87 octane fuel. Costco gas station hours san marcos Engines with higher compression ratios usually require higher octane fuels.

Many owners who operate vehicles designed to operate on 87 octane fuel experience ping and knock. Discount tankless gas water heaters They usually “fix” this problem by purchasing the higher priced, higher octane fuels. Cost of gas per gallon in canada Most owner’s manuals indicate that some light and intermittent ping is normal but that heavy or sustained ping or knock should be attended to by either purchasing the correct octane fuel or servicing the engine.

Most fuel refiners blend fuels for geographic areas and adjust their blends seasonally. How much gas will it cost me These blending techniques compensate for the decrease in oxygen content with an increase in altitude and compensate for volatility during the warmer or cooler seasons. Fuel calculator road trip uk Significant ambient temperature changes (40 degrees Fahrenheit) or altitude changes (4,000 feet) may cause some serious engine detonation. Gas cost for trip from city to city This problem is usually corrected by filling the tank with “local” fuel that has been properly blended for season and altitude.

ACTIVITY: 1. Cost of gastric bypass in uk From the owner’s manual, determine the octane requirements for a personal or family vehicle. Gas prices for road trip If the owner’s manual is not available, telephone, write or visit a franchised dealer for that vehicle to determine the appropriate octane fuel for that vehicle.

2. Fuel cost calculator road trip australia Make sure that the tank level is at ј or less before beginning this activity. Cost of gas in germany today Perform the “MPG test as outlined in the “Fuel Mileage Calculation” guide with the highest octane (91+ octane) fuel available for two sequential tanks. Natural gas price calculator Calculate the two tank MPG. Average cost of gas in california On the work sheet, note any extraordinary engine noises or performance problems during this test and note the cost per gallon.

3. Cheapest petrol in europe Repeat step “2” for the next lower octane fuel (89 octane). Natural gas pipeline cost per mile On the work sheet, note any extraordinary engine noises or performance problems during this test and note cost per gallon.

4. Installing a gas fireplace insert cost If applicable, repeat step “2” a third time with lowest grade fuel (87 octane). How much does gasoline cost in england On the work sheet, note any extraordinary engine noises or performance problems during this test and note cost per gallon.

5. Fuel cost calculator usa For each grade of fuel, use the MPG and cost per gallon to project the fuel cost to operate this vehicle for 10,000 miles.

CULMINATING ACTIVITY: 1. British gas energy price calculator Prepare a short report highlighting the need to determine octane for the selected vehicle.

2. Cost of gas in hawaii Using your MPG data for each grade of fuel, compare the operating costs for ten years at 10,000 miles per year. Route planner estimated fuel cost Assume fuel costs $1.25 for 87 octane, $1.45 for 89 octane, and $1.65 for 91+ octane.

FUEL OCTANE WORK SHEET 1. Cheapest way to boil water gas or electric Octane recommendation (source: owner’s manual): _______

INFORMATION CHECK Place a ” T” before the statements that are true and an ” F” before the statements that are false. Calculating gas cost for a trip canada After each false statement, explain why it is false.

_______1. How much will my trip cost me in gas calculator 91 octane fuel has more potential power than 87 octane fuel.

_______2. Trip planner gas cost To release all the potential power of 91 octane gasoline, it is necessary for an engine to have a compression ratio higher than 9.3 : 1.

_______3. Gas prices in canada per litre Any gasoline engine will efficiently burn any octane fuel.

_______4. Calculating cost of gas for road trip The engine’s compression ratio is the most important factor in selecting gasoline octane.

_______5. Car journey fuel cost calculator Posted fuel octane ratings are a result of testing fuel in the laboratory and under actual operating conditions.

_______7. Gas heating cost calculator uk Engine knock or ping is always a result of poor quality fuel.

TEACHER’S NOTES This is an important energy saving activity for students. Cost of gas to travel 1000 miles Over the years, our society has somehow gotten the misnoma that a “Premium” grade fuel is better for a vehicle than a “Regular” grade fuel. How much does natural gas heating cost per month Most vehicle owners never refer to their Owner’s Manual to determine the acceptable octane fuel for their vehicle. Gallon of gas cost Additionally, when a vehicle begins to knock and ping under acceleration, many owners apply a “quick fix” by switching to premium grade fuel. Average cost of natural gas by state It is true that excessive and continued pinging and knocking is harmful to an engine and this MUST be attended to immediately or serious engine damage will result. Costco gas locations northern california Very few recently manufactured vehicles require premium, high octane fuel. Cost of gallon of gas To operate these vehicles with lower than required octane fuel could lead to immediate and serious internal engine damage. Road trip planner gas and tolls Most engines that do ping or knock on light acceleration do not need premium fuel; these engines need proper servicing such as timing adjustments, repairing vacuum leaks, or servicing emissions control valves. Gas cost calculator for trip To operate a properly tuned engine designed for 87 octane with 89 or 91 octane fuel will only increase the cost of operation. Fuel cost route planner No additional power, fuel economy, or durability will result from the higher octaned fuel.

ANSWERS TO INFORMATION CHECK: 3. Calculate gas costs for commute False. Costco gas california locations To efficiently burn any fuel of any octane, the compression ratio of the engine must be high enough to release all the potential fuel energy.

6. How do i calculate how much gas will cost False. Price of instant gas water heater in pakistan Diesel engine fuels are rated in cetane numbers, not in octane numbers.

7. Gas cost of trip False. Average gas usage per day uk Engine knock or ping may be a result of too low an octane rating for that engine’s compression ratio; most engine knocking and pinging is a result of an out-of-tune engine or emissions control servicing.

RECOMMENDED READING: Ellinger, Herbert E. Cost of gas and electric per month Automechanics, Fourth Edition. How much will gas cost on my trip aaa Prentice Hall, Englewood Cliffs, New Jersey. Gas cost calculator bc 1988.

_____ United States Department of Energy. Average cost of gas per mile Energy Conservation Information for Vehicle Owners. Cost of gas per gallon today U.S. Average cost of gas per gallon Government Printing Office: 1991-289-606.

Shell Oil Company. How much gas road trip calculator How to Get More Miles Per Gallon. Gas prices canada history The Better Mileage Book. Estimated gas cost calculator 1991.

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