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Ram-Air ? (archive)

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Posted by Joseph on August 01, 2001 at 21:35:07:

In Reply to: Custom hood with carbon fiber scoop.... posted by Mpower007 on August 01, 2001 at 20:44:03:

Er, um...unless it is directly routed to the airbox...It can not be "ram-air". In fact, it would be impossible to get a "ram-air" effect with your set-up, even if you did snorkel it to the air-box. "Ram-air", to be effective, must be a "straight shot" into the air intake. Even then, you don't get any horsepower gains until you are already exceeding posted highway speeds(in the U.S.), yes that's right those "ram-air" vents on Pontiacs are all show and no go under 80mph. Cooling the underhood temps should be done with an "exhaust" vent for your radiator. This would be for the hot air to escape from directly behind the radiator(not air be forced into the compartment). Forcing air into the engine compartment, with the configuration that you appear to have, probably increases underhood temps.(I'd have to look at it personally to make a proper evaluation)due to a vacuum effect. It possibly also causes aerodynamic lift on your frontend at excessive speed, probably not much though. Possibly if you opened-up the side vents for the engine compartment, you might get a flow through with the scoop that you have installed. Other than that the only thing that I see that your hood scoop is good for is: Looking Cool. Which is fine, if that's what your into.


Joseph(1985 M635CSi owner)

As a side note: Your M Coupe/Roadster is equipped with a cool-air snorkel system that feeds through the drivers side brake duct. This arrangement is very sufficient for maximum horsepower. At high-speeds(over 100mph) this snorkel does give a slight "ram-air" effect to your motor, due to its particular arrangement.

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