73/74 fresh air through the power bulge... Anyone out there ever try it?

[73runner]

Hey Bruzilla,

I was thinking of using an 1/4" insulation board like polyisocyanurate with reflective Mylar Tom creat a thermal barrier between the engine compartment and the actual base plate. Still thinking on it.

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Here's the first set of idea sketches for the "nostril" vent openings into the hood inserts that would open.




By pitching out the trim " throttles" out at the base I can get a larger opening that would allow substantial increase in the open area.

 

[Bruzilla]

Nice design, but the question again is if you create a closed system to use just outside air, how is the engine going to get air when the intakes are closed? Or would you make ports in the air box that allow engine bay air in when idling, but then close when the "nostrils" open?

 

[ramairthree]

I would like to find a buddy with a 3d printer, scan my inserts, I do have an extra set but don't want to mess them up, print a plastic pair, and cut those slots in them.

 

[73runner]

Nice design, but the question again is if you create a closed system to use just outside air, how is the engine going to get air when the intakes are closed? Or would you make ports in the air box that allow engine bay air in when idling, but then close when the "nostrils" open?

Good question! I hadn't thought on that one other than that the "nostrils" ( i guess thats their new offical name) would not be sealing the opening like a true throttle plate. They might float in the openning and I guess we could make them open grille nostrils to keep the bugs and birds and planes out of the intake. thoughts anyone?

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I would like to find a buddy with a 3d printer, scan my inserts, I do have an extra set but don't want to mess them up, print a plastic pair, and cut those slots in them.

You are freaking brilliant! I hadn't thought of that. Perfect for a 3d printer. And I know some one I can ask when I get back.

 

[scotts74birds]

Hi guys! I also have a 74 RR with the hood. I have also fantasized about making it a true Ram-Air hood. And I don't mean to down anyones ideas. But, can it be made functional? Yes. Can it be made effective? No. That part of the hood would actually be a zero-to-low air pressure area. If you saw it in a wind tunnel with smoke, you would almost see the air skipping over that area due to the pressure wave from the nose of the car. The scoops would have to be farther forward, higher, or more rearward to gain any benefit at speed. The best benefit would be at regular driving speeds due to the use of denser, cooler outside air, rather than hot underhood air. I stick by my original assertion that they would make better machine-gun ports, rather than any style of Ram-Air induction.

 

[wm23n1]

It would be cool if someone could make them "raise up" 3 inches or so when the pedal was floored. Not hinged like an air grabber, just straight up like the 82-84 camaro z28 fresh air hood. You could put some kind of ducting under the scoop to direct air into the engine bay. Ok my drawing sux, but you get the idea. It would take some work, but maybe it would be effective? A really cool WOW factor at least.

 

[tallhair]

I thought maybe it would be helpful to actually have some photo's of the hood you guys are talking about posted here .. neat thread and very interesting conversations guys

Maybe you should be thinking of pulling or sucking in air from the low pressure area vs ram air effect due to the orientation and height of the existing fake openings ??

the Red inserts really pop on the petty blue one

Or maybe graft in a 70 A/G style system to the flat area behind the nostrils ??

Does this one look familiar

 

[Bruzilla]

Hi guys! I also have a 74 RR with the hood. I have also fantasized about making it a true Ram-Air hood. And I don't mean to down anyones ideas. But, can it be made functional? Yes. Can it be made effective? No. That part of the hood would actually be a zero-to-low air pressure area. If you saw it in a wind tunnel with smoke, you would almost see the air skipping over that area due to the pressure wave from the nose of the car. The scoops would have to be farther forward, higher, or more rearward to gain any benefit at speed. The best benefit would be at regular driving speeds due to the use of denser, cooler outside air, rather than hot underhood air. I stick by my original assertion that they would make better machine-gun ports, rather than any style of Ram-Air induction.

I think that point has already been made. Ram air is out, cool air is in.

 

[Loukku]

Custom nostrils on my SSP's hood.

The original straight part (trim) is now curvy and opening is at the back where it suppose to. :icon_porc: At least it does look a little different but not much.
(Credit to whoever took this photo)

Fab pic to illustrate the idea.

 

[HawkRod]

I always wanted to make the "nostrils" on my 73 functional too - then I bought a 70 air grabber and gave the 73 to my son!

But, just to brainstorm a little bit here too. Loukku's pictures are neat. What about if you hooked up the back of those "nostrils" to a twin snorkel air cleaner? Then use some flexible hose, - it would have to be long enough so you could open the hood. ...but, you might be able to do something fairly cheaply.

...just throwing ideas out there...

 

[73runner]

Hey there Loukku,

That looks great! The flat black makes it!

Very creative without spoiling the original design intent. Did you weld the sheet metal to the pot metal ? How did you fabricate it? Did you use the openings to bring fresh air to the cab or just into the engine bay? More picture please from both sides.

 

[tallhair]

Somebody should be selling that as a bolt in replacement !!

Also X2 on 73runner's comment:

That looks really good! The flat black makes it!

Very creative without spoiling the original design intent. Did you weld the sheet metal to the pot metal ? How did you fabricate it? Did you. Use the openings to bring fresh air to the cab or just into the engine bay? More picture please from both sides.

Custom nostrils on my SSP's hood.
View attachment 123935
The original straight part (trim) is now curvy and opening is at the back where it suppose to. :icon_porc: At least it does look a little different but not much.
(Credit to whoever took this photo)

Fab pic to illustrate the idea.
View attachment 123937

 

[Loukku]

Very creative without spoiling the original design intent. Did you weld the sheet metal to the pot metal ? How did you fabricate it? Did you use the openings to bring fresh air to the cab or just into the engine bay? More picture please from both sides.

Those are just openings to engine bay. Made to "bolt on" into original holes. It would take too much cutting, welding and fabrication to make anything else of them. I did not want to ruin a decent hood either.
Anyways these nostrils were on my "must have" list.:headbang:

 

[73runner]

Bumpage

 

[rebootej]

Hey guys, Here's what my uncle and i came up with for the fresh air in the scoops.

Cut and ground out the back of the original inserts. Then made a plate for under the insert, and a "ducting" for behind it. Currently it dumps out right in front of the air cleaner. Haven't decided yet if i want at try and make it seal up to the air cleaner. We didn't have to cut the structure of the hood at all.



View attachment 145389

Inner plate

View attachment 145388

Where the ducting currently ends

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[ramairthree]

Sweet!

Well done

 

[73runner]

X2... Nice fab. Thanks for the shot from the underside of the hood with the scoops mounted. How about some dimensions on the duct.

I really, really , really like that you didn't modify, cut or bend the hood at all !

The idea of this thread was to come up with a way to do it like the factory might have done.

You can even use the paint seal for the original trim on both sides of the hood to seal it tight.

You and your uncle nailed it!!

 

[barnfind]

Very cool idea, I always fantasized about this on the 73-74s Ive owned. Very interesting!!!

 

[Loukku]

Hey guys, Here's what my uncle and i came up with for the fresh air in the scoops.

Those are neat ones.


Somebody should put MAF or something inside these scoops and check which way air moves in them and how much. :thinker:...

 

[tallhair]

Hey guys, Here's what my uncle and i came up with for the fresh air in the scoops.

Cut and ground out the back of the original inserts. Then made a plate for under the insert, and a "ducting" for behind it. Currently it dumps out right in front of the air cleaner. Haven't decided yet if i want at try and make it seal up to the air cleaner. We didn't have to cut the structure of the hood at all.

You and your uncle are doing some really cool things to your car. Well I guess it's your ideas and the uncles skills but whatever. Well done.