Cowl Intake (not cowl induction)

[CTX-SLPR]

Howdy Y'all,

Have a question for you. I see lots of cowl induction feeding off of the high pressure area at the base of the windshield and I see front mounted intakes. Is there a reason why people don't feed air from what used to be the HVAC cowl intake area? It's already built into the body on most cars and is feeding off of the same effect as the cowl hood does. I think the original Z/28's had something similar?


Thoughts?

[STINEY]

It's too sleeperish.......hard for marketing departments to capitalize on?

Hoods are an easy sell, function and cool looks.

[Beagle]

Thoughts? Rain.

[CTX-SLPR]

Thinking LSR racecar here Gents. Why don't people use this on LSR cars or have I just not spotted it in pictures of Bonneville engine bays?

[DanStokes]

I'm trying to remember what I've seen at Bonneville (I see under a LOT of hoods!) but I can't remember seeing this setup. Seems like there might be some advantage there but I have zero data.

Dan

[silver_bullet]

Yes, you are correct about the Z-28's....I do not know if it works on all cars, but, I think the cowl induction hoods were a less expensive easier sell to the public for the manufacturers...Nascar uses the system to this day... Herb Adams used this high pressure theory for the trans am shaker scoops until they were deemed unusable due to either noise or emissions when they installed the riveted panels for cali...if it does not pressurize the system, at the very least, it would be a good case for a cooler intake charge...

[STINEY]

It was noise that did them in. Somewhere I read a neat book on all the cool factory mechanized air intakes of the '60s and '70s and it stated the intake noise was targeted by several municipalities. I find that weird, but then again big crazy cities....anything is possible.

[silver_bullet]

I just heard on the national news that they are going to enact regulations that require electric cars to emit noise...because pedestrians can't hear them!

[JamesMayberryIII]

It was noise that did them in. Somewhere I read a neat book on all the cool factory mechanized air intakes of the '60s and '70s and it stated the intake noise was targeted by several municipalities. I find that weird, but then again big crazy cities....anything is possible.

Pontiac had to block off the shaker in 73 because of new noise pollution regs..

as far as the cowl intake, nascar has been doing that for decades

[CTX-SLPR]

Here's the panel area that would be missing (the welded in plate on the cowl:

Here's the heater box that was deleted from the above pictures (needing the bare metal panel and the black welded in piece):


I'd basically convert that screen section to the intake.

Looking at old NASCAR flow diagrams, it still looks like the base of the windshield is still a high pressure zone:


Now the one thing that makes me wonder is that since the car has a gap between the hood and the windshield, will that recess be under positive or negative pressure? This image I found, in which I'm assuming that the car has a similar windshield to hood gap like most modern vehicles, shows a much lower pressure area at the base of the windshield:


Someone borrowed my rulebook but I remember something in there about you can't put the air intake any lower than it was from the factory. Am I remembering correctly?

Any further discussion?

Thanks,

[JamesMayberryIII]

It sill worked on the pre cot cars that required the stock hood ,roof and deck lid and that was the early 2000's when it went to cot..
and they still have the engine fed at the base of the windshield.. at edge of hood..

[JamesMayberryIII]

The pre cot cars early-mid 2000's still used it, 2002-4 monte and those required the use of stock hood ,roof,deck skins.
Even the car used now had the engine fed at the base of the windshield and edge of the hood.

[YELLA BRICK]

I just heard on the national news that they are going to enact regulations that require electric cars to emit noise...because pedestrians can't hear them!

On Pikes Peak, electrics are required to emit some sort of high decible beeper. Irritating as all getout but they are so inherently quiet, SOME sort of warning of an approaching bullet is needed.

[YELLA BRICK]

I'm sure you guys all know all the following, but these are my own observations.

Intakes through the headlight openings and the use of 'snouts' are the ideal way of obtaining an effective 'ram air' source.(if class rules allow) The faster ya go the more 'ram' !

When building my car, I studied a LOT of salt and lake cars that were using ram air systems. I designed the front of 'the YELLA BRICK' to obtain 'clean' cooler air when running 150 plus in the desert in Open Road Racing. 24 inches off the pavement see's a 10-15 degree difference in ambient air temp. I originally was going to use the front bumper then add my dam off of it, however, as the bumper would be out front a tad, I deduced that it would spoil / dirty up the airstream into the headlight openings, thus I went with what I now have, which is clean uninterupted airflow into the ram air system.

[98ciHemi]

Yay! I'm relevant. This is where I drew air for the Escort's intake. Not that any real testing went into it, but it did seem to function well enough.