Date: Sat, 24 Nov 2007 20:38:28 -0800
Reply-To: Michael Elliott <camping.elliott@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Michael Elliott <camping.elliott@GMAIL.COM>
Subject: Re: Calculate fuel consumption when idling?
In-Reply-To: <BE16EB95D3EA43ED968F43B2706D238A@ZoltanPC>
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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?
>>>
>>>
>>
>> --
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>>
>>
>
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