PJ87

does anyone know of the official name for what I have been referring to as -

"A reverse hood scoop," "Raditor vent," "upside down hood scoop," etc

you know the air vents/scoop that are cut down into the hood and go into the engine compartment, instead of your regular scoops/vents that have at the top what I guess for lack of better terms would be a "hat?"

I googled different combinations of what I thought it's called, but just don't get very good results, either that or I guess it's not a popular mod - but it looks cool. I want to cut one into my first gen and hoping that will allow me to use just a single small electric radiator fan (this isn't a track car)..

thanks in advance to all replies

Evil Aviator

Its proper name is "cowl vent", and if it has a moveable portion to vary the outlet size then it's called a "cowl flap". However, that probably will not help your internet search because unfortunately it is very rare for the aftermarket parts companies to use correct terminology. If you are just looking for aftermarket hoods, then I think your best bet is to make a new forum thread asking for links and pictures of "vented hoods". You will get some with vents in the wrong place, but I think most of them will be the type you are looking for.

A hole cut in the hood will not have rigidity unless it is reinforced with bends or composite build-up material. I don't think that is such a great idea unless you have a lot of metalworking and/or fiberglass working experience.

RacerXtreme7

iTrader: (2)

What your reffering to is called a EXTRACTOR VENT, not a cowl hood, reverse hood, cowl vent, etc.

~Mike................

PJ87

True, I'm starting to doubt that there is an 'official' name for it, no matter what terms/combinations I search I really don't get very good pictures of what I'm looking for.

My idea is more or less the kind that you see on a racing NSX,





I also like these smaller ones that don't require much cutting, they are marketed for the WRX, and I've seen a varriant of them for Lancers as well, but the companies are out of their minds asking $350+!



but, I think the GT-40 is the best example of what I'm talking about, it's sleek and doesn't leave too much of the "you have a huge recess in your hood" look



and yes I will be getting familiar with fiberglassing and hopfully welding in the future

RacerXtreme7

iTrader: (2)

Again, those are called EXTRACTORS. Make sure whatever you make, there MUST be a little fence or lip along its leading edge (like the first pic) or it wont function properly (I assume its a function your looking for and not looks). The aftermarket rarely labels things correctly, but follows "buzz" words instead.

~Mike.............

PJ87

Thanks Mike, and yes - while I do like the look, it is certainly functionality that is biggest playing factor as to why I'm doing it at all... and I don't know if it's coincidence or not, but most highly functional things end up looking "very right..."

thanks again

Evil Aviator

The "extractor vent" term generally implies that it evacuates some type of fumes (such as from the battery, gas tank, RV stove top or latrine, etc.) as opposed to engine cooling air, but I guess it's not incorrect terminology. The HVAC guys are probably happy that the hot rodders finally used one of their terms for a change. I wonder why they don't call it a "flue"? At least they don't call it something completely stupid like they did with the "short ram intake".

Just off hand, do you have a source for that term, or is it just something floating around the ricer community?

RacerXtreme7

iTrader: (2)

HaHa, Ricer community huh? Well, I actually have not seen the term used in the Ricer community at all, nor seen it used in the sale of any type of aftermarket vented hood, and I don't know many Ricers personally. I am however, pretty imbedded in the aerospace community (as I suspect you are too given your tag/name/ID) as my company works extensively with UAV's and other aero systems (full scale too) along with some land based and water based unmanned vehicles as well. One of my offices is located at NASA Langley here in Virginia (references with the type of community with whom I’m normally surrounded by). I've seen the term thrown around on numerous occasions here at work referring to any opening in an aircraft that VENTS be it fumes, heat, moisture etc. I've seen the term used in high end helmets were they refer to the rear vents that would allow the escape of HEAT and moister (head cheese). I've seen the term used extensively in F1, GTO, GT1, and other high end automotive racing such as the pictures that were provided by PJ87 (there is more then an occasionally car in our wind tunnels). Moreover, I’ve seen the term used in boating (I live on the coast), were all the vents that vent fumes and heat from the engine compartments are referred to extractors as well. And yes, the chimneys and stove top vents. All the engineers I've encountered referred to them as "extractors" as they extract some form of gas be it fumes or hot air. The converse I suppose would be a NACA duct or "scoop". So, pardon my "RICER" terminology, but I've always seen those types of vents referred to as extractors.

I suppose “cowl vent” is as appropriate as “extractor vent”.

Cowl scoops or cowl hoods (just using some commonly used terminology) are a reverse type of hood scoop that would protrude above the hoods surface (think and picture muscle cars with after market hoods). The opening would be near the apex of the windshield and hood. This is a high pressure zone and to most would look as though air would escape this area, but in reality because this is a high pressure zone and the rest of the hood normally is low pressure, air enters this type of scoop even though it’s facing the opposite of airflow. NASCAR uses this type of scoop although there’s no hood protrusion, but there is an intake vent at this location (junction of hood and windshield).

And yeah, "RAM AIR" doesn't really happen till your near mach 1, so the term "RAM AIR" is a misnomer but still widely used way before "Ricers" existed (I suppose the shade tree mechanics think that anything “Y” shaped funnels in air, were really it just creates a nice boundary or tumbling turbulent air that isn’t compressing into their little intake systems. To effectively let air flow into an opening, it should be shaped like a V (small end toward air flow) in reference to air flow rather then a Y (big end toward airflow).

Sorry for all the commas and quotes

~Mike..............

Evil Aviator

Actually, I was hoping that you had a good ricer reference, as I like to try and keep up on these things. I can get engineering techno-babble at work, lol.

Off the original subject, but are you guys going to dump the "UAV" term and migrate to "UAS"?

I happen to work with nautical geeks too...
http://home.flash.net/~rfm/MODELING/fix2.html
http://www.sailorsams.com/cowl_vents.htm
http://marinershardware.com/ProdCowlVent.php
http://www.sailboatstuff.com/cb_ventABI.html


Apparently so. It's probably similar to how one turbine engine manufacturer uses "EGT" while another uses "TGT", when in fact they are the same thing.

No way! This guy claims 5 psi of ram air rise at 65mph with his "End of All Cold Air Intakes":
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/end-all-cold-air-intakes-683609/
http://forum.teamfc3s.org/showthread.php?t=55783


LOL, I do the same thing. I think that years of technical writing/reading warps your mind.

RacerXtreme7

iTrader: (2)

Here, some F1 terminology used by Renault compairing a F1 car to a Clio of all things.

http://www.autoblog.com/2006/06/22/r...-renaultsport/

Boat= hole in the water you throw money at, worse then Rx7's

5psi of ram air huh? maybe wiht a rocket straped to the roof!

~Mike..........

jgrewe

iTrader: (1)

Maybe he was reading a magnahelic guage and actually had 5" of water positive pressure?

Or he had his pressure probe pointing into the oncoming air, not 90 degrees to it.(just a WAG on that one, magnahelic more likely)

Evil Aviator

Or maybe he is a compulsive liar who doesn't realize that some people on this forum can actually work a basic physics equation?

jgrewe

iTrader: (1)

I hadn't thought of that angle, sounds more logical now that you mention it.