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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Considering Switch from Coleman Fuel to VP S.E.F Premix
07-31-2017 07:02 PM  10 months agoPost 41
Pistol Pete

rrProfessor

Seffner, FL

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Why bother with the test?

Might as well use the money and time to fly instead.

Besides, you could be accused of tampering with the carb needles.

https://www.fueleconomy.gov/feg/octane.shtml

That link just put me in the google educated genius. It's a gov website, so we know it cant be trusted.

Since Jack is happy with it now and does not have to deal with the smell of gasoline, its a win-win for him.

~~Enjoying the hobby one flight at a time~~

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07-31-2017 08:36 PM  10 months agoPost 42
RM3

rrElite Veteran

Killeen, Texas - USA

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Why bother?... good point.

I really dont feel like going through all off this to prove the earth is round kinda thing. besides who really cares... 3, maybe 5 people?

there is enough evidence out there already, no need to show it yet again.

I'll move on... nothing to see here.

showing a preference will only get you into trouble, 90% of everything is crap...

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07-31-2017 08:50 PM  10 months agoPost 43
JuanRodriguez

rrProfessor

The Villages, Florida

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RM3, you're right .....

It's up to squirrel to do the testing on video to "disprove" the overwhelming facts that have already been presented.....

My guess is that he'll continue to remain silent OR to continue to spew out more of the same nonsense......

Been there, done that and old enough to know better.....

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08-01-2017 12:50 AM  10 months agoPost 44
jackp332

rrKey Veteran

Claremont, Nh USA

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Thank you guys for the input. It's nice to see every one again. I don't have nearly the free time for my helis as I used to so when I do take them out they need to run correctly.

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08-23-2017 07:51 PM  10 months agoPost 45
jharkin

rrApprentice

Holliston, MA - USA

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This thread gave me a good laugh. Mr "Squirrel" is so badly misinformed its actually funny.. Especially when he starts the 3rd grade name calling when he gets called on the bad info.

Reminds me of some in government these days

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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08-24-2017 07:53 PM  9 months agoPost 46
squirrel

rrVeteran

South Whitley, IN

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Jharkin, your are just as smart as your bud JuanR. Neither one of you can comprehend what I stated in the post.
Energy density is higher with the higher octane fuel because to achieve the higher octane rating the fuel contains less alcohol per unit of volume of "gas".

You do get more power out of the engine running higher octane. Running higher octane fuel in your vehicle is some times more cost effective depending upon price spread between the 87 and 93.
Since you cannot even do a valid google search try this:
energy density of alcohol vs gasoline

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08-24-2017 11:31 PM  9 months agoPost 47
JuanRodriguez

rrProfessor

The Villages, Florida

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Here we go again !!

The squirrel came out of his hole and saw his shadow.....!

That means we'll see 6 more months of his BS !!!

Read post #43.....

Been there, done that and old enough to know better.....

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08-25-2017 12:49 AM  9 months agoPost 48
EEngineer

rrProfessor

TX

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What garbage.

Fuel that's way more expensive cannot be "more economical"....period.

It's like "Magic Rotor Spray".....

Here's a nut for you, squirrel...

Watch at YouTube

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08-25-2017 01:52 AM  9 months agoPost 49
squirrel

rrVeteran

South Whitley, IN

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JuanR
Here we go again !!

The squirrel came out of his hole and saw his shadow.....!

That means we'll see 6 more months of his BS !!!

Read post #43.....
Are you that lacking of brain power that you cannot even read, I even supplied you with google search terms so someone of your mental capacity should be able to find material that is understandable. Since you already have a google education and forum education you should be able to do that search unless you are too lazy to even do that.

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08-25-2017 01:59 AM  9 months agoPost 50
JuanRodriguez

rrProfessor

The Villages, Florida

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We're all waiting for your independent testing ON VIDEO.....

Are you too dense to understand what is being asked of you ??

Why are you so afraid to do that ???

Been there, done that and old enough to know better.....

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08-25-2017 02:56 AM  9 months agoPost 51
Eury

rrProfessor

Dover NH

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The problem with your statement is that alcohol and gasoline are 2 different things, and neither are what determines octane. Alcohol can be used to boost octane at the expense of energy density (this is why you see it being used in highly tuned engines with high compression/boost) while it also gives lower mpg the greater percentage is mixed in with gasoline. You are combining and confusing terms. Yes, you'll get better mileage out of gasoline without alcohol, but it has nothing to do with the octane of the gasoline

Nick Crego

Citizen #0168

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08-25-2017 03:55 AM  9 months agoPost 52
BeltFedBrowning

rrKey Veteran

Kansas City

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Well said Eury!

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08-25-2017 02:24 PM  9 months agoPost 53
EEngineer

rrProfessor

TX

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"Why are you so afraid to do that ???"

Because he has no proof other than "green" talking points....

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08-25-2017 03:12 PM  9 months agoPost 54
jharkin

rrApprentice

Holliston, MA - USA

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Jharkin, your are just as smart as your bud JuanR. Neither one of you can comprehend what I stated in the post.
Eury already schooled you but I'll explain it again.. Nice and slow.

Octane rating is NOT a measure of energy density. It is a measure of resistance to pre-ingition (knock). Pre ignition is when the gasoline starts burning spontaneously from heat and pressure like in a diesel.

High performance engines require higher octane typically, because the simplest method to increase power per unit volume is to increase the effective compression ratio (either staticaly or via forced induction). Basic physics tells us that gasses heat up as they are compressed, so the higher the compression ratio the closer you get to the auto ignition temperature of the fuel air mix.

Higher octane raises this auto ignition temperature and thus resists the tenancy to knock, bringing us back to the nice controlled situation where the fuel only burns when the spark plug fires.

(there is more to it that that - i.e. the higher octane fuel burns slower allowing more advanced ignition timing which has other benefits, but lets keep it simple)

Now, a common side effect of the higher octane rating of the fuel is that the specific energy is reduced somewhat. I tired to look it up, but at the moment I cant find any exact figures, the difference is pretty small between regular and super unleaded gasoline. It is enough however to notice a small power drop on a small engine that's made for 87, being run on hi test (usually not noticeable in a car since the electronics compensate).

However, this reduced energy has NOTHING to do with Ethanol. Gasoline fuels using other octane boosters with no ehtanol also have lower energy density as the octane is increased.

It is true that ethanol has a lower energy per unit volume (about 1/3 less than gasoline by volume) however ehtanol also burns at a much richer air fuel ratio (6.4:1 vs 14.7:1). The increased fuel flow more than offsets the lower energy content so ehtanol fueled engines actually make MORE power than gasoline for the same displacement.

Furthermore, ehtanol has a much higher natural octane rating (113) than straight gasoline, and one of its effects in modern fuels is an octane booster. Beyond the environmental mandate, E10 gasoline is being used to achieve the required octane ratings without using large amounts of nastier chemicals like Benzene, Xylene, Toluene, MBTE (banned, a carcinogen) and lead (banned except for avgas, a neurotoxin). In theory, all else being equal using only ethanol to vary the octane, 94octane hi test would contain MORE ethanol, not less; than regular.

Maybe this will prompt you to go do more reading and try and be more humble in the future before name calling and spouting your mouth off on topics you obviously do not understand.

Regards...

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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08-25-2017 03:41 PM  9 months agoPost 55
EEngineer

rrProfessor

TX

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Besides the fact that E87 is much less expensive than E93....which thus makes it much more economical to run.....

Which is why I'm perfectly satisfied with my vehicle's performance vs economy using E87.

Having said that, I'd rather that corn not be used for this "green" EPA nonsense....but rather used to feed livestock, etc......which would reduce the cost of feeding such....and lowering the prices on food.

And subsidizing this is also bad for the economy.

The EPA has no business "regulating" the US economy, and as a result, costs the taxpayers....and stifles the economic growth of our country....with their excessive regulations.

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08-25-2017 10:16 PM  9 months agoPost 56
squirrel

rrVeteran

South Whitley, IN

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Yes, you'll get better mileage out of gasoline without alcohol, but it has nothing to do with the octane of the gasoline
The only fuel around here WITHOUT alcohol is the 91 to 93 octane fuel, what is so hard about that.
Energy density is higher with the higher octane fuel because to achieve the higher octane rating the fuel contains less alcohol per unit of volume of "gas".
The two idiots that started the pile-on about octane and power clearly lack critical reading skills.

At least some one is half correct with lower power with alcohol blend fuel

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08-25-2017 11:18 PM  9 months agoPost 57
JuanRodriguez

rrProfessor

The Villages, Florida

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Didn't I tell you guys that the squirrel saw his shadow ??? LOL !!!!

Been there, done that and old enough to know better.....

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08-26-2017 12:26 AM  9 months agoPost 58
EEngineer

rrProfessor

TX

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"The two idiots that started the pile-on about octane and power clearly lack critical reading skills."

When you're posting complete nonsense, it's you that have no skills....

You're just a shill for the EPA.....

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09-05-2017 02:28 PM  9 months agoPost 59
Mark Ryder

Administrator

Ann Arbor, Michigan

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How to drive a conversation into the dirt...

Starting with...
Your "google" education is not doing you any good...........
Closing with...
The two idiots that started the pile-on about octane and power clearly lack critical reading skills.
Topic closed.

https://www.google.com/search?q=gasoline+octane+vs
https://www.google.com/search?q=gas...ane+urban+myths

Mark Ryder

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