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Dear Ken,
=20
Simple thing=E2=80=A6..if air is entering from the front (with shroud or =
without shroud) the air Must go somewhere.
It can=E2=80=99t get in a status that the air can=E2=80=99t go anywhere =
then there would be no cooling on the radiator.
=20
To answer, the air is going from the engine compartment under the car. =
And a small part along the gearbox tunnel and propshaft tunnel.
There is always air movement. Not sure about the efficiency of the side =
vents but they surely help and don=E2=80=99t hurt =E2=80=93 if there is =
no connection to the wheel arches.
If the vents are open to the wheel arches they more vent the wheels and =
prevent car lift than engine venting.
And not to forget, you don=E2=80=99t get much air through these small =
vents, compared to the big hole under the car.
I did tafting the engine bay and videoed it to see where the air is =
going.
=20
For that part I rely on having much air in the engine bay for cooling =
everything.
I never would coat or wrap headers=E2=80=A6they would soak engine power =
of wrapped or coated.
How do I know? Porsche did many tests on this subject. The cooler the =
exhaust pipe is, the more power.
That=E2=80=99s why I leave everything open.
=20
With regards to drag=E2=80=A6..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.=20
And for lift of the car=E2=80=A6=E2=80=A6I drive in Dago Rake =
style=E2=80=A6..low front , high rear. That creates a slight down force =
under the car from the wedge shape distance to ground under the chassis.
=20
Cheers
Chris
=20
=20
=20
=20
=20
Von: kknight@klaenv.com <kknight@klaenv.com>=20
Gesendet: Montag, 13. Juni 2022 16:02
An: tr4racing@googlemail.com; fot@autox.team.net
Betreff: RE: [Fot] To thermostat or not to thermostat...
=20
Chris;
=20
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.
=20
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
=20
From: Fot <fot-bounces@autox.team.net =
Sent: Sunday, June 12, 2022 11:57 AM
Subject: Re: [Fot] To thermostat or not to thermostat...
=20
I'm not unhappy to have some fresh air under the bonnet.=20
It cooling everything, exhaust headers, electric, carbs, and stuff.
If all is closed only hot air comes in.
No advantage I guess.=20
=20
Cheers=20
Chris=20
=20
=
<http://www.avg.com/email-signature?utm_medium=3Demail&utm_source=3Dlink&=
utm_campaign=3Dsig-email&utm_content=3Demailclient>=20
Virus-free. =
<http://www.avg.com/email-signature?utm_medium=3Demail&utm_source=3Dlink&=
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=20
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link=3D"#0563C1" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>Dear Ken,<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Simple =
thing=E2=80=A6..if air is entering from the front (with shroud or =
without shroud) the air Must go somewhere.<o:p></o:p></p><p =
class=3DMsoNormal>It can=E2=80=99t get in a status that the air =
can=E2=80=99t go anywhere then there would be no cooling on the =
radiator.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>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=3DMsoNormal>There is always air =
movement. Not sure about the efficiency of the side vents but they =
surely help and don=E2=80=99t hurt =E2=80=93 if there is no connection =
to the wheel arches.<o:p></o:p></p><p class=3DMsoNormal>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=3DMsoNormal>And not to =
forget, you don=E2=80=99t get much air through these small vents, =
compared to the big hole under the car.<o:p></o:p></p><p =
class=3DMsoNormal>I did tafting the engine bay and videoed it to see =
where the air is going.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>For that =
part I rely on having much air in the engine bay for cooling =
everything.<o:p></o:p></p><p class=3DMsoNormal>I never would coat or =
wrap headers=E2=80=A6they would soak engine power of wrapped or =
coated.<o:p></o:p></p><p class=3DMsoNormal>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=3DMsoNormal>That=E2=80=99s why I leave =
everything open.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>With regards =
to drag=E2=80=A6..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=3DMsoNormal>And for lift of the car=E2=80=A6=E2=80=A6I drive in =
Dago Rake style=E2=80=A6..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=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Cheers<o:p></o:p></p><p =
class=3DMsoNormal>Chris<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE>Von:</span></b><span =
lang=3DDE> 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=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Chris;<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b>From:</b> Fot <<a =
href=3D"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=3D"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=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal>I'm not =
unhappy to have some fresh air under the =
bonnet. <o:p></o:p></p><div><p class=3DMsoNormal>It cooling =
everything, exhaust headers, electric, carbs, and =
stuff.<o:p></o:p></p></div><div><p class=3DMsoNormal>If all is closed =
only hot air comes in.<o:p></o:p></p></div><div><p class=3DMsoNormal>No =
advantage I guess. <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Cheers <o:p></o:p></p></div><div><p =
class=3DMsoNormal>Chris <o:p></o:p></p></div></div><div =
id=3DDAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><p =
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