Quote Originally Posted by Mr. Clean
hood prop (for heat dispersion)
Race cars don't do this, or at least, it looks a bit differet under their hood than the average propped one.

Quote Originally Posted by 87 Turbo II
Ok, let me clear this up for the idiots who think hood spacing reduces underhood temps.

Do you know how cowl induction works? The base of the windshield is a negative pressure zone, air is actually rotating under the windshield wipers TOWARDS the back of the hood. On a cowl induction car, say..... and old muscle car, this is ducted to the intake runners/carb horns/air filter/throttle bodies/ whatever. They stopped doing this because people were complaining of a "suction"sound at the base of their windshields.

Fastforward to someone with a hood lifted in the back, with no ducting. The air rushing in from behind (not hot air rushing out like people keep saying) creates back pressure in the engine bay, this higher pressure area reduces the airflow through the radiator, thus, heating the engine's coolant, and heating the engine. This is why auto manufacturers install weather stripping at the cowl IN THE FIRST PLACE, and the same goes for underbody splash guards also reducing the air pressure in the engine bay. So all you retards to lift the back of the hood, congrats on making your car run hotter without any aerodynamic knowledge.

Please spread this information on so people will stop doing it.

If anyone wants proof, find a temp gauge that reads digitally for exact purposes, then do a control test at monitoring the temps for a 5 minute drive at a constant speed and see which runs cooler.