Best location for louvers in hood for heat egress (w/pics)

[4WD Toyota Owner Magazine]

I've kind of got a bee in the bonnet--no pun intended--about adding louvers to the Ugly Duckling 1970 FJ40 we are building for heat egress.

Might get louvers punched locally, but more likely will add louver panels. Something like the attached photo--just not so huge! Maybe two panels of 7 or 11 louvers.

My main question is location. The factory louvers are on the sides at rear, in what I expect is a well-thought out placement for engine bay air pressure, to draw hot air out, and also away from the cowl intake vent at the base of the windshield.

Do you think louvers set near the centerline would flow too much hot air to the cowl at street/highway speed?

So to sum up, if you were going to do it, where do you think the optimum location for some new louvers would be? I've attached some additional photos. The "closed hood" pic is our project FJ40.

 

[mdsims]

I'm not sure it's needed. Seems like there is already a lot of venting.

 

[JohnnyC]

Not needed ... and if it is... there are other issues

 

[4WD Toyota Owner Magazine]

Opinions noted! Where you you put louvers if they were, in theory, needed? Always liked the look of louvers in the hot rod world, where they are very common and popular--and do have positive effects, generally speaking.

 

[Downey]

If this is something you feel like you have to do, better make air intake/cleaner and dizzy very water tight.

 

[4WD Toyota Owner Magazine]

@Downey good point, although the truck has a diesel swap going in (Toyota 3B).
Here's the build:

Project Ugly Duckling: 4WD Toyota Owner Magazine's 1969 FJ40 build/3B swap

 

[Steamer]

Not needed ... and if it is... there are other issues

I agree. There's plenty of room for air to escape out the bottom. When my hood and fenders rotted away I fabbed up all the body work forward of the firewall. The hood has no vents. The six blade fixed fan pushes plenty of air out the bottom. With a 170* T-stat I run at 170*

 

[4WD Toyota Owner Magazine]

I agree on all counts. Call it for looks then, but stays functional. It's Project Ugly Duckling, anything goes on this Cruiser.

 

[Tools R Us]

I agree on all counts. Call it for looks then, but stays functional. It's Project Ugly Duckling, anything goes on this Cruiser.

It's all about "style" put them wherever you like them?

 

[emac]

Put the flames on first, then make sure the louvers dont clash.

 

[AdamKFarmer]

Maximum airfow is a must, my humble suggestion

 

[4WD Toyota Owner Magazine]

It's all about "style" put them wherever you like them?

Well

Maximum airfow is a must, my humble suggestion

View attachment 1444046

Actually....hmmmmm....me likey

 

[brian]

what about just cutting the raised center section of the hood out.

 

[jim land]

find an other hood with some rust and dents to make your "special" creation , the one you have look solid and its a nice one with spear , and dont delete the hook , a 40 hood with no windsheild hold down just look strange
its my opinion but you do what you want

 

[Tin basher]

The factory louvers are tapered the back one is wider than the front one
I should have measured them first lol
If a 460 big block doesn't need extra airflow your diesel should be fine

 

[brian]

They are also different lengths and different counts.
Later hoods have 9.
Earlier hoods have 7 but they extend further around the radius of the hood.

 

[MOTOV8R]

The hood has louvers already, what you need is a giant hood scoop.

 

[Tancruiser]

This is just wrong on so many levels if it were a jeep I'd say go for it.

 

[Fast Eddy]

The hood has louvers already, what you need is a giant hood scoop.

And it's very likely that some really smart guys at Toyota put them in just the right place.

 

[Hack]

This is just wrong on so many levels if it were a jeep I'd say go for it.

Naw... I like my CJ5's hood sans louvers:



No problem with heat from the Ford Racing 5.0L under the hood....