Ok, I just typed this (@#%*ing message and my (#*@%ing browser took a **** and I lost it.. so this one is going to be in a "pissed off as hell" tone..

I've got a '79 and I'm going to be putting a TurboII in it. Me and a friend who does custom bodywork are going to do some custom work on the hood.. thinking of putting a hood scoop just in front of the top mounted intercooler, then directing it through the intercooler with some foam or something (kinda like on the old Pontiac GTO's did with their air filters).. then from behind the intercooler, I'm going to use some more foam to move it back away from the intercooler, where it will then begin its upward ascent towards a kinda "reverse hood scoop" that spits the hot air out the top of the hood.

Now, I want to do the same sort of thing with the radiator (if it'll make a difference?). Same as they do on the Impreza Rally cars, where the air comes in the top, and must have some internal ducting through the radiator and out towards the top of the hood. Now my only two concers are: Will this do ANYTHING at all to help the car out, in terms of keeping underhood temperatures cool, keeping a good flow through the radiator/oil cooler, etc? And will it look like ABSOLUTE CRAP?

Here's a picture of what it looks like on the Impreza...

 

I would imagine it would definately keep underhood temp. down. As for the looks, it depends on what you like. If done correctly, I think it would look awesome. Try sketching what you want it to look like and see if it is what you really want. Maybe buy a hood from a junkyard and do the modifications on it for safe measure.

 

I've wanted to know... How do you keep the rain from getting under the hood? *never paid attention to hood scoops*

 

For the I/C scoop, point it backwards. This is the way Chevy did it, they called it cowl induction. Chevy engineers weren't idiots - the junction between the hood and windshield is a very high pressure area.

If you don't believe it, drive down the road at 60mph with the fan off and the vents set to fresh air - you will have a good amount of air flowing through the vents, about where 1 or 2 on the fan speed setting is. All of that air pressure is coming from the cowl, that's why the air intake for the vents/heater is put where it is.

The stock T2 scoop is, bluntly and literally, *** backwards. On 2nd gens (and 1st gens as well) the middle of the hood is a LOW pressure area, because the air flows smoothly across it. High speed air is low pressure air. You don't want to put a scoop in a low pressure area or it won't get much pressure, unless you put it real high up and facing forward like a Pro Stock car.

 

He's right, check out the FC flow chart :

 

Wow, I knew that was somewhere but I couldn't find it. Thanks!

 

I like helping the few people on this board with sense

 

So what does this mean? That Mazda engineers really don't know what the hell they're doing or is that Intercooler scoop just for aesthetics?

Would a T2's hood scoop be more effective if it were raised at the rear edge and ducted to the IC?

 

Oh, I've got plenty of hoods to work with (race car)