GasSavers_BluEyes |
06-19-2008 01:12 PM |
Quote:
Originally Posted by ShadowWorks
(Post 106796)
the hotter the engine the less fuel it takes.
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Nope. When running hot, engines are calibrated to run rich to help avoid preignition and to help cool the engine. Insulation will help speed warm-up and keep the engine warm when running errands however and this improves economy by reducing warmup time.
Regarding lifting the back of the hood, that does not exhaust air, it pushes more air under the hood. Musclecars have used this since the 60's, called cowl induction, to bring in higher pressure, cool air to make more power. Often special intakes are used that seal to the raised cowl area forcing the air into the engine. From an aerodynamics perspective, lifting the rear of the hood is very "dirty" as it causes MORE airflow through the engine bay and underneath the car.
No, Paulie has the right idea. A grille block reduces airflow through the engine bay, while a well placed hood vent redirects some of the airflow that is there under the hood back above the car instead of underneath. Not only will this help reduce drag but also reduce front end lift for more stable handling at high speed. If the hood vent is sufficiently large, a duct could be made to seal the vent to the radiator and redirect ALL cooling airflow out the hood, avoiding airflow over the non-aerodynamic engine block entirely. At that point, a grille block may be superfluous.
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