I was just cogitating about the different types of hoods. Lots of ppl like the look of the Ram Air hoods but others say the Cowl Induction hoods are better. And it came to me, why not do both. he he. hook your intake up to the RA, and cut out the back to make it Cowl Induction as well. Sound cool? Just tossing an idea out there.

 

Because the idea behind ram-air is to create a high pressure area in front of the scoops to force air into the intake. And the idea behind a cowl induction is to create a low-pressure area behind the cowl. Doing both would pretty much negate any positive effect of either by equalizing the pressure difference.

Imagine a parachute or a plane's wing with a big big hole in it. Not much good, is it?

 

you think the cowl hood will make keep the engine a little cooler too.

 

I see your point, but I was thinking of isolating each effect by actually using the Ram Air. So tunnel it into the intake. Or are you saying that by creating this high pressure point in front of the car you won't get the low pressure pt at the cowl?

 

Are you trying to have induction at the cowel side AND the ram air side? Because if you are, then I don't think it'll work (unless of course you have some wierd setup like dual carbs and plumb the ram air to one carb and the cowel induction to the other, LOL, that'd just be wierd!) because of the aforementioned pressure equalization. However, you're probably thinking that cowel induction will vent hot air out of the engine bay while feeding the car ducted ram air from the other side, which... will work (ram air part) and also be useless (cowel induction part).

 

He he, well really while I want a RA II hood, right now I don't have enough for it. I was just curious as to if the second idea you mentioned would work. Where you use the RA for the intake and use the cowl to vent the hot air. Was just curious, ya know. So are you saying the cowl induction doesn't really work that well for venting the hot air, or are you saying that with the ram air it won't work?

My memory may not be working just right now, but don't some parachutes have big holes in the middle. Not that that's really relevant to anything. :lala:

 

Hehe... I meant a big hole. Yeah, regular ol' straight-drop-type chutes do have a hole. They need it to keep it from swinging excessivly.

 

Cowl induction hood does not keep the engine cooler, In fact if it is just vented into the engine bay, it may make the engine run warmer by having too much air on the engine side of the radiator. The cowl area or around the wipers is where you get the air for your vent or heater. If you think the hot air from the engine will escape out through the cowl opening, that is wrong.

 

How do the guys with the ram air hoods keep the rain out? I haven't heard of anyone that has made any of those ram air hoods functional. Even if they were just for looks, I would hate to get caught in a rainstorm and get my nicely detailed motor soaked.

 

My Ram Air II hood is functional, and I never have a problem with rain or anything. Sometimes I get a bug or 2 in there, but not very often. I need to fit my screens in the front from the new TA's and then I won't get anything but nice air Here's a pic of my setup, I'm going to make a circular ring that attaches to my setup to go around the filter to keep the ram air around the filter to make it more effective, right now it is just right against the filter, and most of the air get's sucked in as it enters, but I want to make sure it breathes everything. It seals up behind the hood with rubber striping.

 

My Ram Air II hood is functional, and I never have a problem with rain or anything. Sometimes I get a bug or 2 in there, but not very often. I need to fit my screens in the front from the new TA's and then I won't get anything but nice air Here's a pic of my setup, I'm going to make a circular ring that attaches to my setup to go around the filter to keep the ram air around the filter to make it more effective, right now it is just right against the filter, and most of the air get's sucked in as it enters, but I want to make sure it breathes everything. It seals up behind the hood with rubber striping. Now, as far as the letting the hot air escape, if you take off the stripping on the back side of the hood, that will let hot air escape, but your risking getting water on your distributor, but my friend did it and hasn't had a problem yet.

 

Forgive my ignorance, but how does the Cowl Induction hood work then?

OH and nice setup!

 

Cowl Induction creates a backpressure so-to-speak. It forces the air out of the engine compartment, which in turn, forces more air into it. Or something like that I think

Oh yeah, and my RA II hood is functional, and never had a problem with Rain. She's been in some pretty hard storms also. Not that big of a deal.

 

Someone correct me if I'm wrong, but the ram air works because it has a sort of scoop that disrupts the current of air moving over your hood, sending it into the engine, but the hood is usually (minus the ram air scoop) a low pressure area. So air is moving quickly over it. When it comes to the windshield where the rearward facing scoop (old TAs) or cowel induction setup is, there is a turbulance much like that in the bed of most pickup trucks that have a real tailgate (as opposed to netting) which is why p/u's are still aerodynamic. Anyway, so the turbulance is really air going in a circle, but because the cowel is open and not sealed (like late 70s TAs) the air doesn't just stay in that little cowel area going in circles, it goes into your engine bay where your open element can suck it right up. I THINK this is the idea behind cowel induction. ...Sorry it was so long, guys!