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Old 10-02-2020, 03:30 PM   #341 (permalink)
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53 MPG latest fill up

This might be the last fill of 2020 for the MPGiata...






No new mods this tank.


The weather has turned cooler, so the countdown is on for parking this one and switching back to the Mirage. Regular frost in the forecast!


But there are still a few fine autumn trips in store, I'm sure.

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Old 10-17-2020, 05:04 PM   #342 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

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Correction: one more new aero mod!

This merits aero testing, because it makes a dramatic difference in airflow in the cabin:



I just did a top down 110 km round trip in 9C / 48F sunny weather, and was extremely comfortable with this setup ... dressed for it, and with the heat on the lowest fan setting. It made for a surprisingly warm, still bubble of air.



(It's a household AC unit.winter cover stretched over/ between the seatbacks.)

Without that wind block, I would have had to run the fan at the highest speed to fight a strong current of "outside" air flowing from back to front from behind the cockpit.
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Old 10-17-2020, 07:20 PM   #343 (permalink)
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Genius-level geniusing.
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We are operating at an overall mechanical efficiency of only four percent… Therefore, we find that if we increase the overall mechanical efficiency to only twelve percent we can take care of everybody. That three-fold increase in the overall efficiency can only be accomplished by redesign. – R. Buckminster Fuller

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Old 10-22-2020, 11:27 AM   #344 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

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90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
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Binge drinking diagnosis

^ Oh stop it.


---

By chance, I discovered the conditions that cause the most oil consumption in this car: high engine vacuum.

There's one long-ish hill I regularly go down in 3rd gear, in fuel cut mode. I happened to glance in the rearview mirror and saw a cloud of smoke just when I got back on the gas (combustion re-commenced).

I even heard the engine ping briefly when combustion re-started ... that's gotta be a fair amount of oil in the cylinders to make it ping. The tail pipe is also oily inside.

I repeated the test on another hill and saw/heard the same result.

So... rings or valve seals?
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Old 10-23-2020, 09:02 AM   #345 (permalink)
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Well, the fast way to decide is to put air under pressure into the cylinder through the plug hole and listen where the leaks come out. Breather means rings, intake means valves. I would bet rings in your case because I havent seen a comment regarding oil puffs on start up which is the traditional telltale for valve guides /seals.
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Old 10-24-2020, 11:18 AM   #346 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
Thanks: 3,446
Thanked 6,269 Times in 3,242 Posts
That's a good idea.


Also, I may just ignore the problem.



On this current tank I've been doing a LOT less deceleration in gear, just to see if it makes any difference in oil consumption. I'm halfway through the tank so far. We'll see...
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Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



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has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
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Old 10-24-2020, 05:08 PM   #347 (permalink)
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Princess - '92 Mazda MX-3 GS
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How many OIL-MPG?

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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
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