19 replies to this topic

[Keoni1113]

Hi all,
I took the front hood scoop piece of my starion to sand and repaint it and realized it's not exactly the most functional. Wondering if anyone has molded one to let more air in and help cool things down and how they went about it.  Just a random thought really

[Xtreme Industries]

I believe the dynamics of the car don't allow for much airflow at the scoop location, someone posted in the past some technical drawings showing the negative pressure zone because of the shape of the car would negate any benefit of making the scoop functional. I could be wrong but can see any benefit in spending time and money to do this mod.

[Keoni1113]

Okay, i figured there must have been some reason why no body has done this before,  thanks

[Turbo Cary]

I have a replica 83 hood that Mookeh makes. The guy I bought it from cut the hole open and it seems to help. My temp gauge sits a little bit lower and you can feel heat radiate out sitting still.

While driving I noticed it is a hair colder but not by much. The downside is that water can get inside the engine bay. I ended up drilling a few holes near the scoop to have it drain where the air diverter panel is.

[Keoni1113]

Mkay. I probably won't mess with it then.  Not worth ruining my 83 hood

[logikfive]

I picked up an '83 hood awhile back and it came with some aftermarket hood vents made by Burton.  The sides aren't anything spectacular, but the main front vent is awesome.  While it really doesnt do much anyway, it definitely lets more air in than the original. I am not aware if he made any more.

I picked up an oem set of vents just to have, I may replace the side ones with the OEM at some point.

[Keoni1113]

Just from the pics it looks fairly easy to do.  Just takes a somewhat steady hand. Next time my car is in the shop for a long time I may look for an extra one and attempt that

[JohnnyWadd]

Take the plastic liner out of the side vents and the low pressure will pull air through the front.

[importwarrior]

There is a guy near me that has the front and 2 sides opened up.
Not much flow going through it

[JohnnyWadd]

importwarrior, on 24 August 2015 - 03:31 PM, said:

There is a guy near me that has the front and 2 sides opened up.
Not much flow going through it

What method was used to determine this?

[importwarrior]

well the openning looks like a mail box envelope slit on the front.
the 2 side ones are about the same size envelope slit as the front
just not as wide or long as the front one is side to side.

i will have pics this weeek when i go over to ork on his car.

[JohnnyWadd]

Well I can say that the hood will vent  and let you loose a lot of heat . It all started when I was daily driving my 87 with 83 hood. About 36 miles a day. I always noticed that bugs would get caught in the hood scoop . So i was like okay must be a low pressure enough to cause the airflow. Like the radiator and oil and intercooler get bugs on them. So I pulled out the seals on the vents and got hella more bugs (technical research words there)

Next I noticed on a cold tail winter day I could get steam out the side vents and when I stopped at work after blasting 18 miles down highway 20 I could feel the hot air escaping put the side vents (even on the hot days)

I never hit it with a temp gun or anything like that. But are you going to get hot air escaping like that on a solid hood?

People are gonna post up that aero picture from a flatty in a wind tunnel and say that no way can the scoop be functional. But that is a narrow body car, not a wide body (and most likely lowered or stanced with the front a little lower and a much more aggressive airdam, so It is totally possible that an 83 hood would provide a fair level of venting. Maybe not 100 percent of the time.

Something to keep in mind about the aerodynamic picture where it shows the high and low pressure areas....those change all the time as the car accelerates and decelerates.

Edited by JohnnyWadd, 27 August 2015 - 09:19 PM.

[mbruneaux]

What about heat extractor vents versus more intake vents?   I imagine at speed the restriction is in the trapped air getting out of the engine bay.  I always loved the Trans Am fender vents or the Range Rover fender vents.  I had an '84 trans Am and the heat would pour out of the lower vents whenever the fans kicked on.  I only mention this because I'm not man enough to cut my own fenders.

[importwarrior]

JohnnyWadd


well after talking to the guy and getting a second look this weekend.
The owner did state that the engine temps under the hood do allow
a lot of air out. he noticed the difference after a drive and raising the
hood. it was a lot cooler.

[JohnnyWadd]

importwarrior, on 31 August 2015 - 05:06 AM, said:

JohnnyWadd


well after talking to the guy and getting a second look this weekend.
The owner did state that the engine temps under the hood do allow
a lot of air out. he noticed the difference after a drive and raising the
hood. it was a lot cooler.

That's cool. I think they work. Perhaps minimally as everyone believes. But I see potential in  some work on the vents and the corrugated sheet metal for improving what is there.

[Turbo Cary]

On my hood I was missing the weather stripping for it and the body near the wiper cowl. I put on the cowl stripping and then found with my frp replica hood I need to drill holes for the front strip.

I am going to do that this weekend but also thought, what if I do the same for the sides? I have two spare hood strips that I could drill holes to seal it on the fender. They would need to be cut a little shorter but I could have a 360° seal on the hood.

Would I keep too much heat in or would it help to make a pressure difference and draw more fresh air in?

[prototype78]

Use the hood scoop froma ford raptor lol...i love those

[Leonard Catanzaro]

If I remember from an old hot rod ( some car magazine) article, any vents on the top of the hood, by the windshield will allow or force air INTO the engine bay. Trans Am style,  Escalade , or Range Rover vents will work only if u make some type of holes, or venting in the inner structure by  the strut towers. Im thinking of the vents the Trans Ams used went they changed the body in 82. They were vertical by the bottom of the fender back by the door. Guessing that with hood vents,and bottom fender vents. Air wpuld enter the top, and exit the bottom sides.he air in the top would vent out the bottom sides. Any one have any thoughts?

[cyberquest]

when i did the bodywork on Tman's car he had me cut a hole in the front scoop on his 83 hood so it was functional.

Edited by cyberquest, 04 September 2016 - 08:28 PM.

[IntercooledFlatty]

one thing FOR SURE, it will let the heat out when you are not moving