# Aero=Hood Venting/Scoops Theory Application **URL:** \ **Category:** SON240sx Automotive\ **Created:** [January 17, 2008, 2:25pm UTC](https://forums.speedlife.net/t/aero-hood-venting-scoops-theory-application/112509 "2008-01-17T14:25:37Z")\ **Posts on this page:** 1\ **Showing post:** 16
**Author:** ![BAS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bas/32/5540_2.png) [@BAS](https://forums.speedlife.net/u/BAS)\ **Post date:** [January 19, 2008, 12:12am UTC](https://forums.speedlife.net/t/aero-hood-venting-scoops-theory-application/112509/16 "2008-01-19T00:12:56Z")
your theory is all dependent on the what the pressures are IN the engine bay at speed. it may be that your bay will have a higher pressure then the area where your 'intake ’ is… The only way to make this system work 100% of the time is to make it a close system, so that the air coming into the air filer is ONLY coming from that duct… and you don’t need a scoop or any of that rice/grade 5 cool beans trash… a NACA duct or constant volume duct will work 100%++ better and NOT be a heat magnet in the process. Just to clear some things up so IF your talking to someone educated in physics and/or rng. … aero does _not_ reduce lift. and there is no such thing as down force… it’s called _negative lift_ ( this relates back to the first correction ) With reference to this post, the two best ways to reduce drag on your car; make the front bumper as seamless as possible and don’t cut holes in your hood… > [@WTB: ecu and knock sensor](https://forums.speedlife.net/t/wtb-ecu-and-knock-sensor/15567/2): > > Well i have been doing some reading the last few weeks on car aero and more in particular hoods > > What i found was the goal of any aero was > > 1. decrease drag > 2. decrease lift > 3. increase down force > 4. decrease engine bay temps? > Correct? > > Anyways i figured my car body wise is a piece of junk and its perfect for experimenting. > My s13 is a pignose and with a front mount i can’t see much air circulation making it into the engine and significant pressure build up resulting in air eventually rising in temps and being passed under the car creating lift. > > Ok here is the point were u can tell me if im just being a ricer or if im actually trying to apply factual theories > > Cars have numerous high pressure and low pressure zones, and the goal would be to dissipate high pressure zones into low pressure zones correct? > > Anyways i figure lets apply some new found knowledge to my hood. > > At the front right side (right=hotside) of the hood i figure if i cut a vent it will allow high pressure ambient air into the engine bay. Downside would be pressure build up. Next Step > > At the middle portion of the hood as it levels off i would cut slits that would be bent outwards. This would then cause outside air passing over the hood to create a low pressure zone behind the bent slits allowing the pressure within the engine bay to pass upwards and out. Reducing lift from engine bay pressure and potentially reducing temps. Not this slits are similar to what see on the tops of wheel wells on LeMans vehicles, vipers, and others. > > Diagram: > > ![http://img.photobucket.com/albums/v461/00Fish/untitled.jpg](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/3X/b/e/beac6279b3b7b704349a65ce2b8193b6ab313bf1.jpeg) > > anyways tell me what u think. **Applied Knowledge or Rice** --- _[View the full topic](https://forums.speedlife.net/t/aero-hood-venting-scoops-theory-application/112509)._