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  #31  
Old 02-12-2012, 10:40 PM
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I will be switching to Reg gas with no Ethanol to try it.

I had tried the Eco Fuel Saver but seen no difference, ran 8 tanks on that stuff to really try it.

Waste of $$$$ that was.
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  #32  
Old 02-18-2012, 07:00 AM
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I work for Marathon Petroleum. I can put the ethanol debate to rest. ANY gas with ethanol is 10% or that e85 crap. You'll notice a gain in mpg with real gas since ethanol has less power per gallon. Winter, butane is added to help stuff stay liquid but gets slightly less power. You're engines only use 10% of the gas actually due to inefficient engines and drivetrain loss. Also, this regulation is bad for business from the consumer and producers perspective. That 15% is gonna drop ur MPG lower.
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  #33  
Old 02-22-2012, 02:25 PM
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Quote:
Originally Posted by GTyankee View Post
I usually use the 89, but when prices climb, i may use some 87 between tanks of 89, so it may be more like 88 octane.
Now when i cross into Arizona, i only use 89, prices are 20 to 30 cents cheaper a gallon

The reason that they suggest using 89 octane is because of the Compression ratio
Displacement 5.7L (345ci) Compression Ratio 9.6:1
Bore 3.92 in. (99.5mm) Torque 375 @ 4400 RPM
Stroke 3.58 in. (90.9mm) Horsepower 345 @ 5600 RPM
Fuel Type Gasoline 87 Octane Net Weight 92.9 kg (205 lbs.)
Fuel Induction Sequential Multi‐port Fuel Valve gear OHV MDS 2v/cyl

The general rule is
87 octane up to a compression of 9 to 1
89 octane up to a compression of 10 to 1
91 octane up to a compression of 11 to 1

103 can be used up to 16 to 1


worthless stuff
there are many other variables & 2 different compression types, 1 is DYNAMIC, which i think is the one that engine manufactures use

Compression Ration =
Cylinder vol. + clearance vol. + piston Comp. vol. + gasket vol. + chamber vol. divided by Clearance vol. + piston vol. + gasket vol. + chamber vol.

Read more: http://www.carcraft.com/techarticles...#ixzz1XshuZNpp

GTyankee hit it on the head!!! Keeping in mind all of the different variables, here's an easy way to remember it: High compression engine = higher octane fuels. See my thread "Read that label" with a link attached for Fuel Testers. In that link, you will see how alcohols pretty much does a good job of cleaning out the fuel system.

Additionally, ethanol by it self has a 100+ octane rating. This requires the variables to lean more toward promoting ignition of the gases formed from the fuel air mixture (4.7 has two plugs per cylinder, but it is not a high compression engine).

Save your money.
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  #34  
Old 02-22-2012, 02:37 PM
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This isn't necessarily directly related, but since you touched on the topic of the octane rating of ethanol...

Last time I was at the track there was a guy racing a basically stock chevy cobalt with a 4 cylinder ecotec flex fuel engine. It was stock, with the exception that he raised the compression with aftermarket pistons, had it tuned using hptuners, and was running E85(which like you said has much higher octane than straight gas). He said the compression ratio was about 12:1, which is probably higher than anything you'd ever want in a normal street car running pump gas. Anything over 11:1 is very high for a regular street car on pump gas.

Anyway, the point is he got more power out of his engine running high compression with the ethanol fuel. The key was he had it set up properly for it in terms of compression and timing advance to match the fuel he was using. He was running high 14's and insisted everything else was stock (it appeared so...looked and sounded like stock muffler, had stock intake, stock exhaust manifold, didn't have a lopey idle, etc...). I went home and went online and they are supposed to run like high 15's/low 16's stock. He was running the same times as the stock cobalt SS's, maybe even a bit faster.

So it looks like it can be a good fuel source, if used properly. Also, there must be a way to keep it from deteriorating all the rubber parts.

I was under the impression that ethanol had less energy per the same unit of volume as regular gas, so this almost seems like BS to me, but I'm no expert so I gave him the benefit of the doubt...
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  #35  
Old 02-22-2012, 04:56 PM
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...compression, heat, spark... they all play in to it. SAAB is touting they have a car set up for E85 and it out performs your everyday engines. With the right tweaking, anything is possible.

Alcohol in all it's many forms dries everything. Lucas Fuel Conditioner is new on the market but I can't find anything that explains the science of how it works when mixed with gasoline, E10, E85, and the final outcome.
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  #36  
Old 02-24-2012, 09:02 PM
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Quote:
Originally Posted by gearologist View Post
I will be switching to Reg gas with no Ethanol to try it.

I had tried the Eco Fuel Saver but seen no difference, ran 8 tanks on that stuff to really try it.

Waste of $$$$ that was.
Other than a marina fueling station to refill your boat's fuel tank, where do you find straight gasoline without that evil stuff that is referred to as ETHANOL?
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  #37  
Old 02-27-2012, 01:42 AM
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I used 87 octane in my 5.7L HEMI for the first 50,000 miles as I thought no better of it. I then read that the recommended fuel for the HEMI engine is 89 octane. I switched (since I love my truck and will do anything to make it last longer) and I noticed that my engine seems to run better on the 89. I noticed an ever so slight increase of mpg, <1, however it just sounds like it runs a bit better, and acts a bit more aggressive. The 87 didn't cause it to run like crap, but a noticeable difference to anyone who listens to their vehicle. It is 10 cents more expensive, but that's really only 3 bucks a tank more. I can swing 3 bucks a tank if it makes my truck happier.
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  #38  
Old 02-27-2012, 10:38 AM
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Quote:
Originally Posted by millon9 View Post
I used 87 octane in my 5.7L HEMI for the first 50,000 miles as I thought no better of it. I then read that the recommended fuel for the HEMI engine is 89 octane. I switched (since I love my truck and will do anything to make it last longer) and I noticed that my engine seems to run better on the 89. I noticed an ever so slight increase of mpg, <1, however it just sounds like it runs a bit better, and acts a bit more aggressive. The 87 didn't cause it to run like crap, but a noticeable difference to anyone who listens to their vehicle. It is 10 cents more expensive, but that's really only 3 bucks a tank more. I can swing 3 bucks a tank if it makes my truck happier.
May I ask what you heard or what you are not hearing now from your engine that makes you feel that the love of your life is running better? The reason I ask is because my previous truck (a shi++y silverado) used to make a clicking sound when I pulled a trailer and the rpm's increased. I later learned (VERY recently) about engine compression, heat, winter blend fuels and summer blend fuels and how they all tie in together to effect the necessary octane level for the engine.
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  #39  
Old 02-27-2012, 05:57 PM
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Pretty much with the higher octane the truck can run more timing without knocking therefore making more power. Like if you look at the new mustang power ratings it will show 412 hp for the 5.0 with 93 octane but only like 402 hp with 87 octane because it can't run as much timing
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  #40  
Old 02-28-2012, 09:44 AM
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Quote:
Originally Posted by micar71 View Post
May I ask what you heard or what you are not hearing now from your engine that makes you feel that the love of your life is running better? The reason I ask is because my previous truck (a shi++y silverado) used to make a clicking sound when I pulled a trailer and the rpm's increased. I later learned (VERY recently) about engine compression, heat, winter blend fuels and summer blend fuels and how they all tie in together to effect the necessary octane level for the engine.
Hard to explain exactly...but the engine seems more eager to start up, a little quieter at idle, and smoother idle and shifts. Not like it was knocking on 87, but it runs better overall.
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