Date: Sun, 25 Nov 2007 17:25:50 -0800
Reply-To: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Subject: Re: Calculate fuel consumption when idling?
In-Reply-To: <010401c82fc1$40a8ff70$6701a8c0@TOSHIBALAP>
Content-Type: text/plain; charset=ISO-8859-1
That's not a bad idea. 100 ML of gas in a beaker and time it. Multiply.
On Nov 25, 2007 4:13 PM, Scott Daniel - Shazam <scottdaniel@turbovans.com>
wrote:
> Just want to say two things -
> One, this method, figuring the air amount, the mixture ratio, and so forth
> -
> I'm very impressed, and that you came up with a figure that seems in the
> ball park - right on ! I am inclined to think this could be about right.
> 1/6 gallons per hour.
> # 2 - well.............it would be child's play to run the engine off a
> one gallon can of gas. You just undo the supply line to the fuel pump,
> stick that hose in the can. Then undo the return hose from the engine and
> stick that in the can. Then fire 'er up, and time how long it idles on one
> gallon of gas. Then use that figure to get the fuel consumed in one
> hour.
> Do everything possible to ensure accurate measurement of the fuel of
> course.
>
>
> You might appreciate this story. Thomas Edison gave a new assistant a
> project, to see what the new assistant could do. He assigned him the task
> of
> determining the volume of a light bulb. The new assistant worked for
> several
> hours with formulas and calculations to get the volume of the odd shape.
> When done, Edison looked at the result, and said ....that's close but not
> quite right. He then drilled a hole in the side of the light bulb,
> filled it with a liquid, then poured the liquid out into a calibrated
> measuring beaker, where the volume was easy to determine. It took just
> minutes, and was considerably more accurate. Think simple first.
> Scott
> www.turbovans.com
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Michael Elliott
> Sent: Sunday, November 25, 2007 3:28 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Calculate fuel consumption when idling?
>
> 855 liters per minute? Let's see ... 1.3g per liter = 1,110 grams of air
> per minutes / 15 = 74 grams of gasoline per minutes = 4.4kg of gasoline
> per hour, which is about 6 liters per hour = roughly 1.6 gallons U.S. per
> hour. Same number I came up with before. I might have munged my units, but
> the result appears to be the same-o.
>
> --
> Mike "Rocket J Squirrel" Elliott
> 71 Type 2: the Wonderbus
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> KG6RCR
>
>
>
> On 11/25/2007 9:39 AM Zoltan Kuthy wrote:
>
> > That would be 855 000 cc, if I multiply them all together. Which is 855
> > liter. Is that more likely?
> > Z
> > ----- Original Message -----
> > From: "Michael Elliott" <camping.elliott@gmail.com>
> > To: "Zoltan Kuthy" <zolo@foxinternet.net>
> > Cc: "Vanagon Mailing List" <vanagon@GERRY.VANAGON.COM>
> > Sent: Saturday, November 24, 2007 8:38 PM
> > Subject: Re: Calculate fuel consumption when idling?
> >
> >
> >> 900 (revolutions) x 2 (cylinder firings per revolution) x 475 (cc of
> air
> >> per cylinder) = 855 cc (or air sucked in per minute). That's what I had
> in
> >> mind. Yup.
> >> --
> >> Mike "Rocket J Squirrel" Elliott
> >> 71 Type 2: the Wonderbus
> >> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> >> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> >> KG6RCR
> >>
> >>
> >>
> >> On 11/24/2007 4:55 PM Zoltan Kuthy wrote:
> >>
> >>> 900x2x475=855 ?
> >>> Z
> >>> Unless you were thinking of something else. I liked the way you
> >>> calculated though.
> >>> ----- Original Message -----
> >>> From: "mike elliott" <camping.elliott@GMAIL.COM>
> >>> To: <vanagon@GERRY.VANAGON.COM>
> >>> Sent: Saturday, November 24, 2007 4:26 PM
> >>> Subject: Re: Calculate fuel consumption when idling?
> >>>
> >>>
> >>>> Do you win? Heck, I don't know. I'll take a shot at it. Watch me get
> >>>> it spectacularly wrong.
> >>>>
> >>>> The 1.9L engine has 475cc displacement per cylinder. I think two
> >>>> cylinders fire per revolution, so at 900 rpm we got 900 x 2 x 475 =
> >>>> 855cc of air per minute being sucked into the engine. If the mixture
> >>>> is a good stoichiometric one, we'd have about a 1:15 fuel:air mass
> >>>> ratio. Air has a mass of 1.3g per liter, so that's .855 x 1.3 = 1.1kg
> >>>> of air per minute, with being one-fifteenth of that, or 74g per
> >>>> minute. At 60 minutes that's 4.4kg of fuel. Gasoline masses roughly
> >>>> 740 grams per /liter, so that's 6 liters, roughly 1.6 gallons U.S.
> per
> >>>> hour.
> >>>>
> >>>> Those are the numbers I come up with and I bet they're within an
> order
> >>>> of magnitude of being right.
> >>>>
> >>>> Mike "Rocket J Squirrel" Elliott
> >>>>
> >>>> On Nov 24, 2007 3:52 PM, Matthew Snook <matt@snooksband.com> wrote:
> >>>>> 0.9375? Is that right? Do I win?
> >>>>>
> >>>>> :)
> >>>>>
> >>>>> At 60mph, mine's turning @ 3200rpm. It will burn 3 gallons doing
> that.
> >>>>> 3
> >>>>> gallons per hour at 3200rpm. But it idles at 1000rpm. So that
> comes
> >>>>> to
> >>>>> 0.9375 gallons per hour at 1000rpm. Of course there's no wind
> >>>>> resistance at
> >>>>> that speed, so maybe less...
> >>>>>
> >>>>> Matthew Snook (@ ~3000 ft)
> >>>>>
> >>>>>
> >>>>>
> >>>>> -----Original Message-----
> >>>>> From: Michael Elliott
> >>>>> Subject: Calculate fuel consumption when idling?
> >>>>>
> >>>>> A properly-tuned 1.9L WBX engine would consume how many gallons of
> >>>>> gasoline per hour when idling at sea level? Would this be
> significantly
> >>>>> different at 6,000 feet?
> >>>>>
> >>>>>
> >>>> --
> >>>> No virus found in this incoming message.
> >>>> Checked by AVG Free Edition.
> >>>> Version: 7.5.503 / Virus Database: 269.16.5/1149 - Release Date:
> >>>> 11/24/2007 10:06 AM
> >>>>
> >>>>
> >>
> >> --
> >> No virus found in this incoming message.
> >> Checked by AVG Free Edition. Version: 7.5.503 / Virus Database:
> >> 269.16.6/1150 - Release Date: 11/24/2007 5:58 PM
> >>
> >>
> >
>
--
Jake
1984 Vanagon GL
1986 Westy Weekender "Dixie"
Crescent Beach, BC
www.crescentbeachguitar.com
http://subyjake.googlepages.com/
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