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Date:         Tue, 13 Nov 2007 16:02:48 -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: Hid AUX lamps GoWesty's headlight upgrade kit
Comments: To: Brendan Slevin <brendan@bellatazza.com>
In-Reply-To:  <200711132320.lADNKYCN002975@ss72.shared.server-system.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

LOL! We could have a smarts smackdown but since I usually fold under pressure like a lawnchair, I'll concede this one to Mike S.

-- 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 11/13/2007 3:19 PM Brendan Slevin wrote:

> How many watts brighter is Mike S than Mike E and how does it relate to MPG > increasing? > > :) > > Brendan > > > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of > Michael Elliott > Sent: Tuesday, November 13, 2007 3:12 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Hid AUX lamps GoWesty's headlight upgrade kit > > Coolness. I knew all I had to do was to make an amateurish stab at the > math and someone who knows a lot more than I would provide the real > numbers. Thanks, Mike! > > -- > 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 11/13/2007 3:06 PM Mike S wrote: > >> At 05:32 PM 11/13/2007, Michael Elliott wrote... >>> So, how important is the difference between 160 or 300 Watts of power >>> going to the headlights when compared to 100,000 watts moving the van? >> The point is valid, but some math is missing. >> >> The useful BTU capacity of gasoline is reduced by the fact that engines >> are very much less than 100% efficient, and there are also drivetrain >> losses before any energy is used to move the car. >> >> 20% efficiency is in the ballpark, so we're talking about 20K Watts >> actually being used. An A/C Vanagon has a maximum output of 67 HP, or 49 >> KW, and would cruise at some fraction of that (1/3?) , so all of those >> figures seem to be reasonable. >> >> 140 Watts of 12V power from the alternator is more than that from the >> engine, because alternators, too, are not 100% efficient. 55% is a >> reasonable ballpark, to that 140 W of DC takes ~250W of engine power. >> >> 250W / 20KW = 1.25% >> >> If a Vanagon gets 20 MPG, then the savings would be about the same as >> getting an extra 1/4 MPG. >> >


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