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Old 07-08-2012, 11:02 AM   #511
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Quote:
Originally Posted by VOLDAR View Post
P.S. I just acknowledge that you guys jump from 87 to 89 or 93. There is no 91 there ? Because here, at Petro-Canada, there is a 91 octane gasoline.
We have 90 and 91 around here, no 93. It's all in the Altitude
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Old 07-08-2012, 02:34 PM   #512
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And I want to comment on the point that 'octane' is for 'blah blah and has nothing to do with blah blah'..
Yeah fine in theory.
In the real world something is actually goinng on. What it is ??
I can only say the car runs better, idles better, accelerates better, and gets better MPGs on a HIGHER than 87 octane gas.
89 may be fine, but i just as well go to 93.
Maybe i should alternate between mid level and Premium?
Maybe you should write a book. The 'blah blah' field hasn't been well covered in print.

I gave as simple an explanation as time and space allow. The new Focus has a great deal of engine management to take advantage of the increase in octane for things like idle. If you are getting better economy on 89, I would postulate that the engine management is adjusting the spark timing(as said in the prev post) to accommodate the better ability to avoid detonation.

Our engines run right at the edge of detonation at all times. To make a simple point, we run the Otto cycle, spark fired engine as close to Otto cycle diesel parameters as possible. The diesel engine gets a bit better economy than a spark fired engine due to a lot of things, but primarily the increase in thermodynamic efficiency(converts heat to motion better).

So yes, something is happening. I believe the management module is adapting the engine to better suit the fuel. Without dyno tests, and some double blind test trials it's impossible to say that the increase is concomitant with the increase in cost of 89, but I doubt it will be. Of course, 89 will not hurt your car, just the question about it being provably better is questionable. Gas companies of course, have spent millions of dollars to convince consumers of the benefits, it appears much of that ad investment is paying off.
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Old 07-08-2012, 02:37 PM   #513
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Are you saying that it does or doesn't add spark?

Edit: Sorry, just a joke from earlier...
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Old 07-08-2012, 02:44 PM   #514
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More sparkz is goooood. In aviation, we use two sets of spark plugs and circuits for redundancy, but it also provides a slightly better burn profile. I'm surprised more auto mfg haven't gone to a dual spark setup. All I can guess is maybe the advantages aren't there to justify the cost.
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Old 07-08-2012, 05:08 PM   #515
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Climbing almost 6,000ft in second and third gear kills MPG's just an FYI
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Old 07-08-2012, 05:19 PM   #516
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Multiple 4th gear redline pulls at sea level kills mpg's just an FYI
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Old 07-08-2012, 05:57 PM   #517
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Climbing almost 6,000ft in second and third gear kills MPG's just an FYI
Not if you get to go down the other side without riding the brakes or doing much engine braking.


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Old 07-08-2012, 06:00 PM   #518
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Not if you get to go down the other side without riding the brakes or doing much engine braking.


Brian
Well, instant read was up to 29.5mpg by the time I got back down off the mountain and just before I got back on I-40.
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Old 07-09-2012, 09:18 AM   #519
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You guys doing this are something. I have a Lawnboy mower that needs oil in the fuel and it has had E10 since the early 1990's. Pioneer Hybrid Seed uses 25 or so horse power Honda engines on the belt conveyors at their seed processing plant and my cousin said a year ago they had like 4 to 6 thousand hours on E10 without problems. You guys must have relatives in the militay that need a job guarding the Middle East oil industry.
That's fantastic for you. I, however, have had nothing but carb problems on my mowers, running fresh E10.

From http://www.boattest.com/Resources/vi...px?NewsID=3465 ...

Rob Gleason, service manager of Bee Line Yamaha Super Store in St. Joseph, said 70 to 75 percent of the boats they see at the beginning of the boating season are coming in for a carburetor cleaning due to buildup from oxygenated fuels. Oxygenated fuels include substances such as ethanol and biodiesel and contain oxygen, usually intended to reduce carbon emissions.

You'll notice they actually point out that small engines running ethanol are different from typical car engines in that we tend to drive our cars daily, whereas mowers and the like sit idle for a week or more at a time. The article is specifically about boats, which can sit idle for weeks or months, but some power equipment engines sometimes also do (tillers, etc.)

This is just the first example I found. Try Google, there are hundreds more.

Quote:
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I don't want to be 'that guy', and I hope for you it is otherwise, but my rough idle has always come back. Every time I have thrown something new at the car it reacts with no rough idle, but after a few hundred mile it returns.

After running 93 through your tank a couple of times, if you so desire, switch back to 87 for a tank (or less, go less). You will notice the decrease much more easily than the increase...
Yep I have to concur. I just noticed this morning, about 400 miles into running 93 octane, that my rough idle is back.
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Old 07-09-2012, 10:38 AM   #520
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Climbing almost 6,000ft in second and third gear kills MPG's just an FYI
just need moar HP
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