Hood Insert Project

[technocoy]

eh, I had remembered this a bit different...

If you ditch the second tier of the design (the upper part) I like the shape of this. The top part is too square and too much for the design, but the underlying form is nice.

http://www.vehicross.info/gallery/sh...ppuser/20/sl/r

[technocoy]

if you have a forward scoop, would it make sense from a performance standpoint if it was further to the front of the hood? If so, I think I'm going to photoshop an idea.

[Techy-D]

Anybody try anything like this?
Sorry, I grabbed the first photo out of the galery for my quick edit job.

Just a thought.

[JoFotoz]

Sorry Techy , but that's a big .. ..from me.

jo

[Cobrajet]

You need a scoop that is both functional and self explanatory... Like the AMC Scrambler!




I'm kinda partial to the shaker scoop myself!

[snowtrooper1966]

Allright, you got me thinking back to my MOPAR days. The reason I was thinking cowl INDUCDTION, was I did not want a forward facing scoop to grab snow during the season. But there was a MOPAR design that allowed the driver to activate the ram air scoop from inside the cabin:





I think I will investigate this a bit further. It would be sick to have a scoop on the dragon that has teeth and harkens back to my old muscle at the same time. You cant beat the "fliying tiger" inspired teeth design on this scoop, IMHO.
Best,

[johnnyapollo]

OK, back to the scoop. There are generally three very different effects that are considered desirable that involve piercing the hood for a scoop:

1. Forced air systems - this involves supercharging or otherwise inducing higher air pressures in an intake plenum - the engine compensates by increasing fuel producing more "pounds" of pressure which boosts engine performance. Just about any opening to the outside can improve performance as the SC itself pulls in air mechanically (why most go to a cold air intake system that vents to the fender hole in the VX). If you can get the opening right in the air flow you maximize the cooling effect (see number 2).

2. Ram air systems - this works if the opening to the outside is placed somewhere so that when the vehicle is in motion the force of air movement increases the pressue in the intake, thus producing slightly higher pressures and you get a performance gain. Unfortunately, if you map the airflow across the hood the leading edge forces air over the hood about 6-8 inches before it dives back in right at the leading edge of the window. What that means is that for an induction scoop to be effective, it would need to hit the air starting about 6 inches above the hood, a three inch opening would extend 9 inches above the hood or so (this all depends on where you're mapping the air as it forms a large-radius curve so the height varies). This is actually fairly typical and why you see supercharged street rods with the huge scoop extending to the roofline or above to get the most benefit (relates back to number 1).

3. Inducted air systems - basically a hole that lets in outside air (cooler than whats under the hood). If you really look at the scoop on the scoobies it doesn't go to the intake and most other low-profile scoops you see actually go to an intercooler (it's really pulling "exterior air" without a ram-air effect - it vents to the outside to take advantage of slightly cooler outside air temps). If the openings are to the back of the hood, vehicle motion can induce a cooling effect that exits heated air through the openings (sometimes called reducted or something like that). It really takes a bit more than that to get a measurable difference but that's a starting point (to be most effective airflow would be engineered using baffles, etc to direct the air over the motor so it would exit through these venting ports).

So in summary, for a supercharged VX a CAI setup to the fender seems to be optimal (so no scoop needed) - for maximum effect a huge scoop that extends above the air-foil into moving air would be needed as the hood opening. For Ram-air on the VX, the leading edge of the hood is about the only surface where an opening could be made that would actually induce a ram-air effect - you'd have to go to the front of the truck itself for more benefit when in motion (hardly any benefit when not moving). For inducted air, just about any exterior opening would suffice, but since the VX doesn't have an intercoolor it doesn't have much effect - creating openings in the back of the hood would help to pull heat from the engine compartment, but then you're just pulling it into the cabin due to the placment of venting (raises cabin temps and pulls in nasty engine smells).

So forward facing, low profile scoops on the VX are really mostly for looks. Even cutting open the hood would have little cooling benefit (and it could actually be detrimental by dumping solids in the air on the block - think about running water over the engine while it's running (if you're using an unshielded cone filter you can get it in the intake), water in the alternator, etc.

and that's the scoop.

-- John

[Joe Isuzu]

wow John! good input!

[Techy-D]

Sorry Techy , but that's a big .. ..from me.

jo

Hey, I spent like 2 minutes on that.
I think it may be something that would grab some of that leading edge air and wouldn't have the "scoop on a scoop" look, but I don't think I would do that to mine either.


Snowtrooper - I also see that you too enjoy Mopars! I've had the same thought and actually my little sketch was thinking along those lines. I have a Lemontwist/Velvet black, 383HiPro, 70RR with Airgrabber, but sadly it's still one of those projects that's in pieces and under a tarp (SOME DAY).