Premium or Regular Unleaded Gas

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speed1

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On a 6.5 hp , HF engine I did notget an owner's manual with it, should I use Premium or regular Unleaded gas, does it make a difference? Thanks...Bob
 
fowler

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U can use what ever u want
They are usually run on regular

These industrial engines can run on petrol with sticks in it if u want

Premium may give u slightly better performance and it should burn cleaner

Basically it will do what the ads say it wil

They use such a small amount that we use premium in our machines as the engine tends to run healthier for longer
 
r_chez_08

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Will not make much difference. However, if you jack up compression, premium is probably higher octane and would withstand higher compression before detonation.
 
devino246

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The ONLY, read it, ONLY, difference between 'regular' and 'premium' gasoline is the octane rating. The octane rating is the resistance to detonation, as r_chez said. Higher octane gasoline, or 'Premium', does not run cleaner, hotter, or better. It simply requires more heat to ignite it.


Now, the ONLY exception to this is if the lower octane gasoline contains ethanol, while the higher octane doesn't. Even then, the difference in energy content is approximately 3.7%. That's way too small of a difference to notice.
 
fowler

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Huh I was under the impression it was the same as ultimate deisel
Oh well that's what u get for never buying petrol from a pump

Oh well u say u won't notice the differences but when an auger is running for 14 hrs a day for 1 month we find the engines run cleaner in the end
Anyhow if its 5 c more then over a 44 gallon drum (205L) u only spend an extra $10.25
 
Doc Sprocket

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Fowler, you're lucky. Over here (at retail level) we average about 10 cents/litre more for premium vs regular unleaded. The difference adds up quickly.
 
devino246

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fowler said:
Huh I was under the impression it was the same as ultimate deisel
Oh well that's what u get for never buying petrol from a pump

Oh well u say u won't notice the differences but when an auger is running for 14 hrs a day for 1 month we find the engines run cleaner in the end
Anyhow if its 5 c more then over a 44 gallon drum (205L) u only spend an extra $10.25
Click to expand...

Like I said, some higher octane fuels use less ethanol in their mixes. That seems strange to me, since ethanol does a great job of boosting the octane rating, but it is sometimes the case.


I had attempted to determine the actual energy loss from running 10% ethanol by volume with stock jetting, but gasoline mixes vary widely depending on season, location, and crude from which it was distilled. I could still attempt it, I would just need to do it several times over with different mixes to get accurate results.

My hypothesis was that because ethanol requires less air to fully combust, the result of running E10 with stock jetting was a poor a/f mixture, resulting in power losses greater than than 3.7%. One problem is that I would need to find out how much energy would be consumed when the products of ethanol's combustion combine with the un-used air.

I had gotten so far as to determine the volume of one mole of 2,2,4-Trimethylpentane, Heptane, and Ethanol. This was needed to convert the volumetric percentages of the gasoline mix to molecular percentages. The math required covers several pages, and that's only a fraction of what's needed. And in order to get accurate results, rounding has to be used as little as possible.

Just food for thought:

There are-
1,204,428,300,000,000,000,000,000 Carbon atoms
3,613,284,900,000,000,000,000,000 Hydrogen atoms
602,214,150,000,000,000,000,000 Oxygen atoms
in one mole of ethanol.
One mole of ethanol is 58.388390367553865652724968314322 mL

So that means that for every mL of ethanol, there are-
20627872979853452819327.070766885 Carbon atoms
61883618939560358457981.212300655 Hydrogen atoms
10313936489926726409663.535383443 Oxygen atoms
 
Doc Sprocket

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devino246 said:
Like I said, some higher octane fuels use less ethanol in their mixes. That seems strange to me, since ethanol does a great job of boosting the octane rating, but it is sometimes the case.


I had attempted to determine the actual energy loss from running 10% ethanol by volume with stock jetting, but gasoline mixes vary widely depending on season, location, and crude from which it was distilled. I could still attempt it, I would just need to do it several times over with different mixes to get accurate results.

My hypothesis was that because ethanol requires less air to fully combust, the result of running E10 with stock jetting was a poor a/f mixture, resulting in power losses greater than than 3.7%. One problem is that I would need to find out how much energy would be consumed when the products of ethanol's combustion combine with the un-used air.

I had gotten so far as to determine the volume of one mole of 2,2,4-Trimethylpentane, Heptane, and Ethanol. This was needed to convert the volumetric percentages of the gasoline mix to molecular percentages. The math required covers several pages, and that's only a fraction of what's needed. And in order to get accurate results, rounding has to be used as little as possible.

Just food for thought:

There are-
1,204,428,300,000,000,000,000,000 Carbon atoms
3,613,284,900,000,000,000,000,000 Hydrogen atoms
602,214,150,000,000,000,000,000 Oxygen atoms
in one mole of ethanol. One mole of ethanol is 58.388390367553865652724968314322 mL
Click to expand...

That bored, huh?:roflol:J/K. Very interesting!
 
devino246

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toystory_4wd said:
That bored, huh?:roflol:J/K. Very interesting!
Click to expand...

Hah, well I have done most of it late at night! Thanks, though. I may pick this back up and attempt to publish my findings. Now that would certainly be interesting!

I've got so many things going for me, I may end up only getting half on all of them:ack2:

Speaking of which, anyone seen Robert around lately?
 
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some fuels in some engines start to act funny at over 14,000ft anyway but where I live most people don't have a vehicle that has a problem or they just don't go that high!! :D diferent fuels don't realy make that much difference exept in extreme conditions IMO :thumbsup:
 
fowler

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We live in the 21ist century and work in metric

So the fuel is sold in litres 3.7 lt to the gallon

Also we buy straight off BP
We have a massive fuel depot in town

A tanker truck comes out and fills our tanks

10,000lt deisel tank with fast fill 2000lt overhead tank and 4000lt mobile tanker
Then 3 44 gallon drums for petrol
 
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I love the technicality , wish I could understand it...I am so confused right now that I hope I never run out of gas:) ...Thanks for all the answers...:) Bob
 
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