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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Dear Ken,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Simple thing…..if air is entering from the front (with shroud or without shroud) the air Must go somewhere.<o:p></o:p></p><p class=MsoNormal>It can’t get in a status that the air can’t go anywhere then there would be no cooling on the radiator.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>To answer, the air is going from the engine compartment under the car. And a small part along the gearbox tunnel and propshaft tunnel.<o:p></o:p></p><p class=MsoNormal>There is always air movement. Not sure about the efficiency of the side vents but they surely help and don’t hurt – if there is no connection to the wheel arches.<o:p></o:p></p><p class=MsoNormal>If the vents are open to the wheel arches they more vent the wheels and prevent car lift than engine venting.<o:p></o:p></p><p class=MsoNormal>And not to forget, you don’t get much air through these small vents, compared to the big hole under the car.<o:p></o:p></p><p class=MsoNormal>I did tafting the engine bay and videoed it to see where the air is going.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For that part I rely on having much air in the engine bay for cooling everything.<o:p></o:p></p><p class=MsoNormal>I never would coat or wrap headers…they would soak engine power of wrapped or coated.<o:p></o:p></p><p class=MsoNormal>How do I know? Porsche did many tests on this subject. The cooler the exhaust pipe is, the more power.<o:p></o:p></p><p class=MsoNormal>That’s why I leave everything open.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>With regards to drag…..the floor of the TR4 is not slick, so drag is not an issue. If the drivers compartment is closed, that would rise the top speed significantly but not if the front is sealed. <o:p></o:p></p><p class=MsoNormal>And for lift of the car……I drive in Dago Rake style…..low front , high rear. That creates a slight down force under the car from the wedge shape distance to ground under the chassis.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers<o:p></o:p></p><p class=MsoNormal>Chris<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=DE>Von:</span></b><span lang=DE> kknight@klaenv.com <kknight@klaenv.com> <br><b>Gesendet:</b> Montag, 13. Juni 2022 16:02<br><b>An:</b> tr4racing@googlemail.com; fot@autox.team.net<br><b>Betreff:</b> RE: [Fot] To thermostat or not to thermostat...<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Chris;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If more air comes in than can go out, for instance at speed, nothing moves and there is no cooling. There are only a few ways to get air out from under the hood on a TR, some cowl work, side vents as on factory racers and through the bottom. With coated headers most of the heat goes down the pipe and the electrics are not that sensitive. Only fresh ambient temp air reaches the carbs. I have raced this setup at well over +100f/38c and all was good (water and oil temps). Less air in means less exiting under the car with lifting and turbulence causing drag.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hey listen, its more work and complex, likely worth only a tenth or so. Kas liked it and it was fun to engineer. Have a great summer racing, Ken<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b>From:</b> Fot <<a href="mailto:fot-bounces@autox.team.net">fot-bounces@autox.team.net</a>> <b>On Behalf Of </b>Chris Marx via Fot<br><b>Sent:</b> Sunday, June 12, 2022 11:57 AM<br><b>To:</b> <a href="mailto:fot@autox.team.net">fot@autox.team.net</a><br><b>Subject:</b> Re: [Fot] To thermostat or not to thermostat...<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I'm not unhappy to have some fresh air under the bonnet. <o:p></o:p></p><div><p class=MsoNormal>It cooling everything, exhaust headers, electric, carbs, and stuff.<o:p></o:p></p></div><div><p class=MsoNormal>If all is closed only hot air comes in.<o:p></o:p></p></div><div><p class=MsoNormal>No advantage I guess. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Cheers <o:p></o:p></p></div><div><p class=MsoNormal>Chris <o:p></o:p></p></div></div><div id=DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=1 cellpadding=0 style='border:none;border-top:solid #D3D4DE 1.0pt'><tr><td width=55 style='width:41.25pt;border:none;padding:9.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank"><span style='text-decoration:none'><img border=0 width=46 height=29 style='width:.4791in;height:.302in' id="_x0000_i1025" src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png"></span></a><o:p></o:p></p></td><td width=470 style='width:352.5pt;border:none;padding:9.0pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:13.5pt'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:#41424E'>Virus-free. <a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" target="_blank"><span style='color:#4453EA'>www.avg.com</span></a> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>