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1. question for all you rocket scientists (score: 1): Author: "Lynn Wall" <lwall@wt-inc.com>; Date: Wed, 13 Jun 2007 09:24:44 -0600; This may be a stupid question and probably covered in the past but I have not read anything related and those I have asked are not sure either so here goes: Two virtually identical cars (or the same; /html/tigers/2007-06/msg00051.html (7,781 bytes)
2. Re: question for all you rocket scientists (score: 1): Author: CoolVT@aol.com; Date: Wed, 13 Jun 2007 11:28:19 EDT; I'm sure that the efficiency of combustion will figure in here somehow (engine running hotter or cooler), but will wait for the expert opinions. Mark L.; /html/tigers/2007-06/msg00052.html (7,241 bytes)
3. RE: question for all you rocket scientists (score: 1): Author: " Ron Fraser" <rfraser@bluefrog.com>; Date: Wed, 13 Jun 2007 15:02:59 -0400; You maybe using the wrong term for you description. The higher you go in altitude the less oxygen is in the air; thus the term thinner air. I don't believe there is less volume of the mixture we cal; /html/tigers/2007-06/msg00055.html (9,284 bytes)
4. Re: question for all you rocket scientists (score: 1): Author: "Scott Hutchinson" <shutchin@netjets.com>; Date: Wed, 13 Jun 2007 15:09:29 -0400; There is the same volume of air, but it is less dense. I imagine the ability of a given volume of air to conduct heat is reduced as well. The capability of the cooling system must be compromised to s; /html/tigers/2007-06/msg00056.html (8,101 bytes)
5. RE: question for all you rocket scientists (score: 1): Author: "Smit, Theo" <Theo.Smit@dynastream.com>; Date: Wed, 13 Jun 2007 13:51:22 -0600; The ambient air pressure goes down with altitude; the average pressure in Calgary (altitude 3500ft) is about 90% of sea level pressure. The oxygen content (by volume percentage) is still around 20-21; /html/tigers/2007-06/msg00057.html (8,542 bytes)
6. Re: question for all you rocket scientists (score: 1): Author: DJoh797014@aol.com; Date: Wed, 13 Jun 2007 21:25:12 EDT; It's simple physics. Water boils at 100C at STP (standard temp pressure (ie 1 atmosphere). At higher altitudes there is less air pressure. That why water boils at a lower temp in Denver If you're coo; /html/tigers/2007-06/msg00058.html (7,952 bytes)
7. Re: question for all you rocket scientists (score: 1): Author: Paul Memont <prmnes@verizon.net>; Date: Wed, 13 Jun 2007 21:28:45 -0400; Wouldn't the pressure in the closed cooling system remain the same? Whatever the cap release pressure is? Paul; /html/tigers/2007-06/msg00059.html (8,466 bytes)
8. Re: question for all you rocket scientists (score: 1): Author: Paul Memont <prmnes@verizon.net>; Date: Thu, 14 Jun 2007 16:22:29 -0400; Unless I just don't understand, with a radiator cap on the car the amount of oxygen in the air would not matter to the temp in the radiator. The boiling point would be higher depending on the rating; /html/tigers/2007-06/msg00060.html (9,097 bytes)
9. Re: question for all you rocket scientists (score: 1): Author: <arado7@sbcglobal.net>; Date: Thu, 14 Jun 2007 16:29:26 -0400; The cooling system of a car is not a rigid sealed system. There are rubber hoses and flexible sheet metal elements in radiator and heating coil. Therefore I believe atmospheric pressure would influen; /html/tigers/2007-06/msg00061.html (8,644 bytes)
10. Re: question for all you rocket scientists (score: 1): Author: Stephen Waybright <gswaybright@yahoo.com>; Date: Thu, 14 Jun 2007 13:34:52 -0700 (PDT); Isn't the pressure rating of the cap relative to the outside ambient pressure? You essentially have ambient pressure outside the face of cap valve, plus the spring which provides the force to oppose; /html/tigers/2007-06/msg00062.html (9,141 bytes)
11. RE: question for all you rocket scientists (score: 1): Author: "Smit, Theo" <Theo.Smit@dynastream.com>; Date: Thu, 14 Jun 2007 14:46:02 -0600; Hi Paul, The amount of oxygen in the air (i.e. the mass of oxygen in a cubic foot, or any fixed volume) determines the amount of power that the engine can make and therefore the amount of waste heat; /html/tigers/2007-06/msg00063.html (9,874 bytes)
12. Re: question for all you rocket scientists (score: 1): Author: Paul Memont <prmnes@verizon.net>; Date: Thu, 14 Jun 2007 17:01:40 -0400; I agree that the hoses and such are indeed flexible and give some, but with pressure building while engine heat rises these parts hold the pressure otherwise they burst and a boil over results. Doesn; /html/tigers/2007-06/msg00064.html (9,856 bytes)
13. Re: question for all you rocket scientists (score: 1): Author: Paul Memont <prmnes@verizon.net>; Date: Thu, 14 Jun 2007 17:04:28 -0400; Hi Theo, I think I've got it! Please disregard my last e-mail! Paul Smit, Theo wrote:; /html/tigers/2007-06/msg00065.html (10,082 bytes)
14. RE: question for all you rocket scientists (score: 1): Author: "Robert Palmer" <rpalmerbob@adelphia.net>; Date: Thu, 14 Jun 2007 17:07:19 -0700; I would add another factor that's affecting the heat generated, and that's compression. Although the compression ratio stays the same, the absolute compression (lbs/in2) goes lower at higher altitud; /html/tigers/2007-06/msg00066.html (8,094 bytes)

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