Specific gravity of race gas: How important?
#47
01-17-2009, 08:26 AM
Doc,
How long a race fuel takes to lose octane depends on UV exposure, Air exposure, Moisture exposure, and a host of other things. It's not really possible for me to put an expiration on it. If you call VP, they can tell you. Just tell them how and where it's been stored as well as what type of fuel it is and they will be able to tell you the approxiamte shelf life.
Oxygenated fuels(in the racing fuels), will release additional oxygen during the combustion process resulting in a higher concentration of oxygen during the firing event. Oxygen is normally present at 20.947%, with an oxygenated fuel espect about 21.994% oxygen content, resulting in more power per unit of air. I took the following excerpt from the VP website.
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Q16 will work well in any drag racing or circle track application -- naturally aspirated, nitrous or blowers. Q16 is highly oxygenated, requiring a 4-6% increase in fuel flow, which will make 3-5% more power than competitive 116 octane fuels. Q16's oxygenation will significantly expand the range of air/fuel ratio acceptability, so performance will be more consistent and won't vary as dramatically with altitude or density changes. For bracket racers, variations in ET from run to run will be substantially reduced. This added fuel flow also effectively increases its octane by 6-8 numbers above its standard ASTM octane rating.
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Justin
How long a race fuel takes to lose octane depends on UV exposure, Air exposure, Moisture exposure, and a host of other things. It's not really possible for me to put an expiration on it. If you call VP, they can tell you. Just tell them how and where it's been stored as well as what type of fuel it is and they will be able to tell you the approxiamte shelf life.
Oxygenated fuels(in the racing fuels), will release additional oxygen during the combustion process resulting in a higher concentration of oxygen during the firing event. Oxygen is normally present at 20.947%, with an oxygenated fuel espect about 21.994% oxygen content, resulting in more power per unit of air. I took the following excerpt from the VP website.
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Q16 will work well in any drag racing or circle track application -- naturally aspirated, nitrous or blowers. Q16 is highly oxygenated, requiring a 4-6% increase in fuel flow, which will make 3-5% more power than competitive 116 octane fuels. Q16's oxygenation will significantly expand the range of air/fuel ratio acceptability, so performance will be more consistent and won't vary as dramatically with altitude or density changes. For bracket racers, variations in ET from run to run will be substantially reduced. This added fuel flow also effectively increases its octane by 6-8 numbers above its standard ASTM octane rating.
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Justin
#50
01-17-2009, 10:13 AM
this is interesting. So even though Ms109 is much lower in octane it actually helped with the race tune. That says a lot for MS109.
#51
01-17-2009, 10:24 AM
Sean , i didnt know it was oxygenated with ethanol ..
on pump 93 i think most of the fuels have ethanol mixed in with them, i was told that the ethanol in the 93 pump actually waters down the fuel and its more of a bad thing.
on pump 93 i think most of the fuels have ethanol mixed in with them, i was told that the ethanol in the 93 pump actually waters down the fuel and its more of a bad thing.
