<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><font class="Apple-style-span" color="#000000"> </font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><span class="Apple-tab-span" style="white-space:pre"> </span>I think you must be kidding (based on your other droll statements!).<span class="Apple-converted-space"> </span>Though Freon (a registered trademark, I think DuPont owns it) is an excellent refrigerant, the gas itself is not simply 'cold', so tires could not be kept from over-heating by being inflated with it.<span class="Apple-converted-space"> </span>The act of inflating a tire actually INCREASES the temperature of the gas inside (it is this property that partially explains how refrigeration systems work).</div></blockquote></div> <div>Inflating a tyre does heat it up (PV=nRT), but not to the operating temperatures required by Formula One. Quote:</div><div><br></div><div><p style="margin: 0.0px 0.0px 11.0px 0.0px; line-height: 15.0px"><font face="Verdana" size="3" style="font: 11.0px Verdana"><font class="Apple-style-span" color="#F9233B">"A dry-weather racing tyre in Formula One generally operates at an optimal temperature of around 100° C.</font></font></p><p style="margin: 0.0px 0.0px 11.0px 0.0px; line-height: 15.0px"><font face="Verdana" size="3" style="font: 11.0px Verdana"><font class="Apple-style-span" color="#F9233B"> In contrast, intermediate spec tyres operate at between 40°C to 100°C, depending on the wetness of the track, while full wets approximate 30°C to 50°C. "</font></font></p></div><div><br></div><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Verdana" size="2" style="font: 10.0px Verdana"><font class="Apple-style-span" color="#F81519">"The lead article in the December 2007 issue of </font><i><font class="Apple-style-span" color="#F81519">Racecar Engineering</font></i><font class="Apple-style-span" color="#F81519"> is titled </font><u><font class="Apple-style-span" color="#F81519">Secrets of the F2007</font></u><font class="Apple-style-span" color="#F81519">. </font></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 10px/normal Verdana; min-height: 12px; "><font class="Apple-style-span" color="#F81519"><br></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Verdana" size="2" style="font: 10.0px Verdana"><font class="Apple-style-span" color="#F81519">Mentioned in this article are 4 items that were exposed in the spygate matter.</font></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 10px/normal Verdana; min-height: 12px; "><font class="Apple-style-span" color="#F81519"><br></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Verdana" size="2" style="font: 10.0px Verdana"><font class="Apple-style-span" color="#F81519">The first item discussed is about the gas that Ferrari uses to inflate their race tires.</font></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 10px/normal Verdana; min-height: 12px; "><font class="Apple-style-span" color="#F81519"><br></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Verdana" size="2" style="font: 10.0px Verdana"><font class="Apple-style-span" color="#F81519">Ferrari uses a 50% mixture of R404a and CO2. They found that this mix transfers heat effectively from the tire to the wheel. Ferrari did not blister tires as much as their competitors.</font></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 10px/normal Verdana; min-height: 12px; "><font class="Apple-style-span" color="#F81519"><br></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Verdana" size="2" style="font: 10.0px Verdana"><font class="Apple-style-span" color="#F81519">Ferrari also found that the performance of the tire did not drop off as dramatically compared to using pure nitrogen." </font></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;"><br></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;">The gas mixture also did not need to be de-humidified (its the water vapour content of regular air that raises the real havoc with pressures)</span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;"><br></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;">One drawback, however, is that CO2 apparently starts bonding with the rubber compounds and will eventually compromise the overall structure, so this will be okay for the normal (about 20-25 laps) life of an F1 tyre, but not for a club car or a street vehicle.</span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;"><br></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;">So the refrigerant is not used in its normal manner (as an adiabatic heat cycle), but as an inert, dry, heat conductor.</span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;"><br></span></font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font class="Apple-style-span" face="Verdana" size="2"><span class="Apple-style-span" style="font-size: 10px;"><br></span></font></div><div> <span class="Apple-style-span" style="font-size: 12px; "><div>Joe Owens</div><div>Presto!Digital Colourgrade</div><div>302-9664 106 Avenue</div><div>Edmonton, Alberta T5H0N4</div><div>+1 780 421-9980</div><div><a href="mailto:jpo@prestodigital.ca">jpo@prestodigital.ca</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span> </div><br></div></body></html>