Octane Overkill

yes. it will sour, turning into a substance not unlike varnish. but this
can take a long time. stale gas is a problem when you take your snowblower
out after 10 months of dormancy.

it just seems to run better. at least as far as the gas goes. you might
other motor issues though. i cant think of any, but as far as the gasoline
goes, it is not going to cause any difference between weekly fill ups.

 

am i not supposed to flame this gentleman shagnasty?

please do tell us all. you can be as adamant as you want but it wont make
you right. i am anxiously awaiting you to insert foot deeply into mouth.

 

first, i aplogize. there is alot of bs about octane on the NG's, and it
seems nobody can bother to study the friggin topic, just rehash what some
lunatic once said. and since i am generally not any more informed than the
usual newspaper reading kind, i do get a bit peeved when the topic is about
something i actually know very well.

im no mechanical engineer. i dont think we disagree on this point. it is
important to consider that there are variables as to how knock will be
induced. octane rating of fuel and compression are what determine knock,
and to a much lesser extent engine design. i do not think that there is
much room left in the combustion chamber design department for improvements
to be made. assume that the theoretical engine has been designed with an
efficient combustion chamber. the topic is secondary in modern engines, and
we have already spent too much time discussing it.

it is a big topic, octane and knock. but this is not the most complex
science ever studied. review some of the work done by thomas midgely.
gasoline has been researched to death. there is no way in hell anyone is
ever going to make an observation about gasoline and post it on the internet
that has not already been said 1000 times before at a refinery lab.

for you, sure.

 

You make valid points. I believe thats called auto ignition. My
comments are confined to application of variable valve timing and high
expansion ratios. I would appreciate feed back on my patent 4,961,406
which can vary the burn rate of fuel at low rpm under variations of
load.
Heres an experiment for prius owners. Run your tank low and put in a
small amount of E85 and see if you feel a power increase as per
earlier mentioned web site. If there is a problem you can just fill
the rest of the tank with conventional fuel and dilute the E85.
Experiment should cost less than one dollar

 

Less energy is available per pound of gasoline run through the engine.

 

I wouldn't expect to experience an increase or decrease in power. The ICE is
completely under the control of the hybrid system, and the hybrid computer
commands power from the ICE or the battery to suit its needs. Some have
asked if there are modifications to increase the Prius performance, and
there are not - for that very reason. In fact, with the shifter in park the
accelerator can be floored and the engine will only gradually increase speed
to about 2000 rpm top.

Mike

 

I refuel about once a week. It probably is just a fluke, but there is a
noticeable difference. It's primarily just slightly better throttle
responsiveness, not an increase in horsepower. I guess the reason as to why
will just remain a mystery. ;-)

Thanks for your input, to both you and "joe lang".

Jonathan

 

Less energy is available per pound of gasoline run through the engine.

thanks.
measure it any way you want.
gasoline has the same energy regardless of octane. (and where on earth is
gasoline measured by the pound?)

this is perhaps the most fundamental constant in petroleum study. i will
point this out once more for you Mr Shagnasty in case you are bitter at
being told you are just wrong.

all gasoline has the same energy per volume. always. period.

octane is not a measure of energy. if you are unaware of this basic fact,
you should not be posting advice about octane, rather you should sit in your
chair, stare at your computer, and learn. now go, go. go away and play
video games until mom calls you for dinner.

 

thanks.
measure it any way you want.
gasoline has the same energy regardless of octane. (and where on earth is
gasoline measured by the pound?)

this is perhaps the most fundamental constant in petroleum study. i will
point this out once more for you Mr Shagnasty in case you are bitter at
being told you are just wrong.

all gasoline has the same energy per volume. always. period.

octane is not a measure of energy. if you are unaware of this basic fact,
you should not be posting advice about octane, rather you should sit in your
chair, stare at your computer, and learn. now go, go. go away and play
video games until mom calls you for dinner.[/QUOTE]

Quit top-posting.

Do you dispute this sentence:

"A gasoline with a higher octane rating will produce less BTUs when
burned than a lower octane gasoline."

If you do, then I *know* you're an idiot.

(For the record: I did not write that sentence. I copied it...)

 

That is simply not true. Gasoline is a mixture of a large number of
components, and the mixture varies from grade to grade, station to
station, week to week and from place to place. One example is that the
winter formula with extra oxygenates contain several percent less energy
pr gallon than the summer variety.

Adding ethanol to gasoline will increase the octane rating and decrease
the energy content.

 

We'll never hear from "Joe Lang" again.

 

ah, if it were only true.
i will gladly take you on with half my brain tied behind my back! it is you
who should perhaps open a book. for the record, this NG and the vw
watercooled NG have been down this road many times before, and there is
always someone who thinks they have it figured out. always. sometimes i
pick a fight. and sometimes i dont have time to educate. but you decide
that you know what you are talking about based on what? your ego?
i would be willing to venture a guess that you have never put in any of the
required study to make the statements that you seem so confident about, but
there you are. just have to take the bait.

so i will gladly educate you, if you ask the right question.

Randolph wrote

you are correct in just about everything you say. the gas you buy today
will certainly be different from the gas you buy next week. and it is true
that oxygenates such as MTBE TBA TAME etc will efectively lower the BTU per
gallon. (so my statement needs to read "all gasoline has the same energy
per volume. always. period, except in cases when comparing oxygenated to
normal RFG II". but that is not very elegant at all is it?)

*it is certainly true that all gasoline has the same energy content*. and
all oxygenated gasoline has the same energy content. (MTBE is roughly 7%
oxygen, and since oxygen does not contribute to BTU, gas with MTBE is
effectively "lower power". sometime we can discuss how MTBE has a
relatively HIGH octane value, but that is another topic... strange huh?
high octane, but lower energy... are you paying attention? will elmo
perhaps take the bait? think elmo, think before you hit that reply all
button.)

you can add whatever feedstock you want, and at the end of the day the fuel
will be blended to meet RFG II guidance. that is exactly what refinery does
you know. they select from a huge number of variable chemicals based on
price and availability to meet the RFG II requirements, along with local
requirements. wouldnt it be a different situation if Exxon gas had more
energy than Shell gas? maybe if you just contemplate what it is you are
trying to believe you can see the absurdity of your statement.

please please please do not think that octane has anything to do with energy
content (or flame speed or quality or anything other than anti knock
ability.) that is not what octane measures. if it did, i would reccomend
that you exclusively purchase 100 octane aviation fuel. boy, think of the
performance!

if i dont have anything to add, i usually keep quite kid. a word of advice,
it is better to keep silent and appear ignorant than to post to a NG and
remove all doubt!

 

hey, you might think the world is flat too. but you look pretty damn stupid
to anyone who has any idea of what they are talking about. where did you
get this information?

maybe you might start not believeing everything you read. look, i dont want
to bust your hump, but come on man, im giving you an oppurtunity to learn
about a topic you obviously care about. now try and learn a little so next
time you can have fun when some moron posts bullshit.

 

I'm curious; why do you bother to use periods, and even question marks?


RFT!!!
Dave Kelsen