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MotorGround >> Cowl induction


12/6/08 8:17 PM
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LetsTalkItOut
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How does cowl induction work on hoods?

Just high pressure on top of hood causes the air to go into low pressure in engine bay?
12/6/08 11:18 PM
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White347LX
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That lip that pops up creates a vacuum which draws in cooler air.
12/7/08 7:57 PM
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LetsTalkItOut
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Lip that pops up your talking about, you mean like on the 70' Chevelle?
http://www.chicagomusclecars.net/images/806_Hood.jpg

Is a cowl hood and a cowl induction hood different things?
http://www.restoration-world-chevy-parts.com/67-69%204%20inch%20steel%20cowl%20hood.jpg

What about those huge whatever inch fiberglass cowl hoods. Are those still for induction or to make more room for the engine up top?
12/8/08 4:23 PM
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White347LX
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Oh yeah, I guess there is a difference. When I think of cowl induction I instantly picture a 70 LS6 Chevelle. Those were set up to route that air directly into the air cleaner.

I know on newer Mustangs the cowl hood is either for looks or just to gain clearance for a 351/460. There's really no benefit to performance since the opening isn't connected to the engine it just vents the entire engine compartment.
12/8/08 10:05 PM
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LetsTalkItOut
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Ok, think I understand now. So the cowl hoods that don't have the lip are pretty much for clearance, and they actually have the opposite effect of getting air into the engine bay?
12/9/08 2:41 PM
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White347LX
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I don't know about that, they would create airflow.
12/10/08 6:04 PM
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Ponyboy
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1963 z11 impala came with cowl induction.



Camaro style cowl induction.

 

Corvettes as well as camaros used the hood rather than open the firewall.

The only factory cowl induction I know of that had trap doors visible from the outside were the 1970-1972 chevelles and the 1981 camaro Z28.

The chevelle used a vacuum servo and the 1981 camaro used an electrical solenoid.




 

12/10/08 9:24 PM
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LetsTalkItOut
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http://www.mrbodykit.com/bodykits/hoodsimages/hoods/94extendedhood5.jpg

Now a hood like, the main reason for a hood that big would be for clearance. Has that big hole affect the induction part of it?
12/11/08 10:23 AM
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Ponyboy
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The high pressure area is right there.

That's why most every car has the climate control intake there and why you get air through the vents when the fan isn't on.

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