General Message Board

Hey D Norris.. Chevylover and DaGoat have both explained this one to the hilt! Those two know nascar brother!! Read their answers to most of these Q&A's.. It's as good as some of the paid commentators on the networks!!

There's alot to be said for SPEED channel's Race day and FOX Sports Countdown to green.. huh Scott? lmao!

It's not air flow to the motor guys, as a matter of fact it has nothing to do with the motor or the oil inside the resevoir. It is all about aerodynamics, behind the drivers seat there is a oil cooler box. This box has a enclosed radiator type grill system that pulls air from under the car to cool the oil in the resevoir mounted in the box.Unbolting the oil cooler lid relieves the pressure under the car, venting trapped air from under the car into the trunk or cockpit where it can escape. I'm sure everyone has held their hand outside the car while driving down the interstate, when you hold your hand straight out, cupping it causes the air flow to push your hand backwards, while holding it flat like a airplanes wing, reduces the drag. Having the lid secured causes restricted air flow, acting like a parachute. Huge advantage for the #99!

It has nothing to do with the engine. The box they are talking about it behind the driver's seat. Here is what was said by a NASCAR crew chief.

One NASCAR crew chief described the infraction as an aerodynamic advantage that allows air to be sucked through the oil reservoir and shift the balance from the rear of the car to the front.

A better explanation, when the oil tank is sealed there is pressure build up in the engine, thus restricting the engine somewhat. When more air is allowed into the block via a loose oil resevoir top(cap). It actually allows the engine to breath easier and restricts it less allowing it to gain a little horsepower.