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Old 10-22-2014, 12:57 PM   #1
joeldemeritt OP
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Being anal about gas.

At the pump, the valve is in the nozzle, the Cutoff valve at least, but behind that is X amount of hose that's filled with gasoline.

I have a 2.3 gallon tank, and when I select high test (assuming the guy before me chose 87) how much of that 87 is dispensed in my tank if the valve to separate the different octanes is somewhere inside the pump?

using real rough estimates 0.612 gallons of gas in 15 ft hose. (Math below)

Is it worth it to get premium with such a small tank? Or is the octane separation somewhere closer to the nozzle?


After everyones' deliberation, 1" ID is a lot. So this is probably overkill.

Inside radius of the hose ~1/2"
pi*((1/24)^2)' = 0.0055 ft^2
Lets say 15 ft of hose?
0.0055*15
=0.0818 ft^3
Theres 7.48 gallons in a cubic foot
0.818*7.48
=0.612 gallons of gas in 15 ft of 1" ID hose

joeldemeritt screwed with this post 10-22-2014 at 05:15 PM
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Old 10-22-2014, 01:01 PM   #2
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WOW, you paid attention that day in school. If your numbers are correct that is a good question, My BMW PD holds 9 gallons, but my Vstrom would be push. I usually only put regular in the Vee unless it is going into storage.
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Old 10-22-2014, 01:14 PM   #3
joeldemeritt OP
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After reading this I guess the question is:

"Where is the Blend Valve?"

http://auto.howstuffworks.com/gas-pump.htm

Also the myth about getting gas in the mornings so it'll be more dense; not true, apparently theres a sensor and a calculation to adjust prices accordingly.
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Old 10-22-2014, 01:19 PM   #4
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I find a pump that was used for premium previously.
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Old 10-22-2014, 01:22 PM   #5
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Wait till he figures out how they blend mid grade and his head explodes.
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Old 10-22-2014, 01:25 PM   #6
fast4d
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don't they blend the midgrade/89 at the station during fill up?

thank god for (cars) knock sensors!

timing on the bikes are probably not on the edge so maybe that's why I've never had a problem.
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Old 10-22-2014, 01:27 PM   #7
joeldemeritt OP
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Quote:
Originally Posted by Anorak View Post
I find a pump that was used for premium previously.
Do you just look who's filling up a premium worthy car?
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Old 10-22-2014, 01:32 PM   #8
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A fuel stalker. I always wondered about those people who hover around the pumps with nice cars at them...
Now I know...
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Old 10-22-2014, 01:41 PM   #9
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Quote:
Originally Posted by joeldemeritt View Post
...is the octane separation somewhere closer to the nozzle?..
the octanes are stored in the handle like a Glock 17, when you pull the trigger the octanes are set free and jump out the nozzle into your tank. squeeze the handle multiple times for multiple release...
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Old 10-22-2014, 01:42 PM   #10
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This has come up before

I can't take the time at work to go find the thread, but I recall that someone posted a link to a pump specification document, and the critical piece of info for this discussion.

The document stated that there would be no more than a third of a gallon of gas in line ahead of your purchase selection.
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Old 10-22-2014, 01:42 PM   #11
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Quote:
Originally Posted by vintagespeed View Post
the octanes are stored in the handle like a Glock 17, when you pull the trigger the octanes are set free and jump out the nozzle into your tank. squeeze the handle multiple times for multiple release...
There's a penis joke in there.
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Old 10-22-2014, 01:46 PM   #12
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Quote:
Originally Posted by mampula View Post
I can't take the time at work to go find the thread, but I recall that someone posted a link to a pump specification document, and the critical piece of info for this discussion.

The document stated that there would be no more than a third of a gallon of gas in line ahead of your purchase selection.

One of the bike magazines did something about this years ago. I think they came up with 0.2 gallons in the hose.
So your math is off somehow (I ain't proofreading it to find out where)
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Old 10-22-2014, 01:46 PM   #13
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I'm not familiar with your formula so the one I use is pi *r^2 for the cross sectional area of the hose multiplied by the length, which works out to 35.34 cubic inches ann my math came up with 0.15gal. Much smaller than what you came up with and for a 2.5gal tank that worths out to a hair over 5% .

i'm not real interested in doing the math to figure out the resulting octane rating. I do know that running premium my bike with a 10.5:1 piston makes it run noticeably better.
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Old 10-22-2014, 01:54 PM   #14
joeldemeritt OP
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Quote:
Originally Posted by Karlfitt View Post
One of the bike magazines did something about this years ago. I think they came up with 0.2 gallons in the hose.
So your math is off somehow (I ain't proofreading it to find out where)
Thinking about it, the hose probably is way smaller than an inch ID. That'd have a huge effect
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Old 10-22-2014, 01:57 PM   #15
mattlikesbikes
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Quote:
Originally Posted by joeldemeritt View Post


Inside radius of the hose ~1/2"
2*pi*((1/24)^2)' = 0.011 ft^2
Lets say 15 ft of hose?
0.011*15
=0.165 ft^3
Theres 7.48 gallons in a cubic foot
0.165*7.48
=1.23 gallons of gas in 15 ft of 1" ID hose
You are combing equations for circumference (2 pi r) and area (pi r^2), so right off the bat you are 2X over estimating. Second I think most gas hose is a lot less than 1" ID, I would venture half that.

I am guessing it is a lot closer to a .1-.2 gallons.

If it really concerns you then run octane booster. Honestly octane is way less important than quality of the gas. If you are really concerned with what you put in your tank only fill up at high end new gas stations.
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