Hood Vents

[Phill]

Decided to put in vents but I need to know where is the best place to place a vent(s) on the 1995 GQ that is running on TB42E
Also could you please comment on weather I should go with

[MKPatrolGuy]

Also could you please comment on weather I should go with

Whether you should go with what?

[Phill]

Ooops

sorry please ignore my last line

[bogged]

To let heat out, or fresh air in?

[Phill]

ok guys

I need help
I was told that vents help in cooling the engine
How?
What part of the hood should it go on?
Right, left, middle, etc

[bogged]

ok guys

I need help
I was told that vents help in cooling the engine
How?
What part of the hood should it go on?
Right, left, middle, etc

You can do both.
You can do at the front to let cooler air in, then either in the rear section of bonnet or in the guards, and direct air out that way..

Over the exhaust mainfold area would be best, where most heat is.

I have heard of people spacing the back of the bonnet on hinges, to lift the rear of bonnet about 5mm to let hot air out that way too

[Phill]

any one with pictures?

[chimpboy]

ok guys

I need help
I was told that vents help in cooling the engine
How?
What part of the hood should it go on?
Right, left, middle, etc

It isn't going to matter that much where you put them. Letting cool air into the engine bay is not the purpose of these vents; they are purely to let hot air out.

When the engine is running, this basically means giving incoming air (that has come in through the radiator) a way out. When the engine is not running, it means giving hot air around the exhaust a way to flow off into the air rather than soaking into the rest of the motor (since the exhausts are hotter than the rest of the motor; coolant has stopped flowing so the block and heads can get hotter than they should.)

Anywhere toward the rear would be good. Given that they are going to function just as well in most locations, I'd base it mainly on appearance.

Jason

[Phill]

Thx guys

I am off to get my hands on a two vents made of Carbon Fiber
and another electric fan for my radiator

[CRUSHU]

dont you loose your "air pocket" when travelling thru water? or doesnt it make much difference?

[bazzle]

Why do you want vents on a Petrol ??

Bazzle

[Phill]

The temperature here in summer reaches 55 - 60 degrees. Imagine driving in the desert with your foot down on the accelerator to climb dunes which are 150 meters long. you will need to stay cool
Take a look at the gallery of Dubai 4X4 and you will know www.dubai4x4.com

[bogged]

It isn't going to matter that much where you put them. Letting cool air into the engine bay is not the purpose of these vents; they are purely to let hot air out.

Depends which way the fins are on the vent.. One way will force air in, other will not, so will force out .. or am I dreamin

[5upaMav]

I reckon that the best way would be to fit them to the rear of the bonnet, with the fins facing backwards. As I understand it . . . if you have air flowing over the bonnet as you drive, then it has a tendancy to create a lower pressure area and hence draw out the engine bay air. I've seen lots of taxi's with this setup. Plus lots of performance cars use this theory.

[fatassgq]

mine are set up like this. At the rear with fins in vent facing backwards.
They do work well for letting hot air out of the engine bay.

I know someone also that put them just behind the radiator with a thermo fan running the hot air that came out of em was amazing!!!

not very good pic of vents but you get the idea of where they are at.

[GQ TROL]

As Bogged has suggested, first try lifting the rear of the bonnet 10mm or so using washers/packers to help hot air escape. If this reduces operating temps, then go ahead with the vents. If not, then look elsewhere for your problem, because fitting vents may not achieve anything.

Cheers
Mitch

[Phill]

Does the metal on the hood need to be treated after cutting it to avoid the rusting process?

[GQ TROL]

>>Does the metal on the hood need to be treated after cutting it to avoid the rusting process?>>

I would certainly prep it with a primer after you've cut room for the vents. Its easy enough to get spray cans of touch-up paint to finish the job nicely.

Cheers
Mitch