After FI, My Engine Bay temp. gone up a lot. Engine oil temp. is fine,
but the fan is working much harder & pulling all the hot air from radiator into engine bay.

The heat has killed my Optima battery & discolored some cables in the engine bay. The g's hood is sealed all over, there is no vent on the upper part of the hood where all the heat are accumulating. The bottom of the car has openings but as you all know, heat goes up & stays up.

I want to create a functional hood vent but don't want to mess up the hood.

Finally, I found a way to make the vent. The hood has deep double layer toward the rear, I cut a 3x7" opening from the under side, then a 2x5" hole
toward the rear of the hood. The top layer is untouched & a heat barrier tape is applied to prevent heat discoloration of Hood paint not that the doble layer hood has been cut open.

There's a 3' rear end vertical ledge just above the rubber seal, that where the vent is cut. Then I glued a stainless steel mesh at the rear 2x5' opening. This vent will allow hot air to escape but the vertical mesh keeps the water out.

This vent is totally invisible from out side.

 

View from out side the hood, You can not see the opening,
It's tucked behind the hood & hidden by viper assembly.
There's about 0.5" space between the vent & the wiper assembly that allows heat to be effectively vented out of the hood.

 

more pics!

 

Here is one more picture,

I placed camera on the windshield & try to take a snap shot of the vent from out side,

It's close-up , so the image is not clear, but you can see part of the wire mesh, which is the white area above the wiper assembly.



Because the vent cut from under hood & the rear of hood, it's hidden, there's a lot less worry about messing up the hood.

 

Can you show a close-up view of the vent from inside the hood?

 

wouldnt water get in very ez when u wash it?

 

Can you take some pics when it's sunny outside? They're kinda dark and hard to make out the details.

 

so you took part of your plastic shielding around the winshield off???

 

I like the concept, but can't really tell what was done... better pics would be good.

 

Have you actually found that your under hood temps have dropped? It is hard to see what you have cut/modded. Maybe a DIY.

 

I am having a car wash today. will see if there's water getting into Engine bay.

I installed a Temp meter in the Engine Bay.
Prior to cutting the vent:
Engine bay T=100 when 70F outside, T=130 when 90F outside.
(Measured next to the battery chamber wall.)
Will see what the impact of the vent give in the next couple of days.

Optima battery is SLA type, which is extremely sensitive to high heat.
SLA battery will last 10 years at 75F, but last only 1yr at 150F.
No wonder my yellow top died after a yr. If the out side temp is 100, then the Engine Bay becomes >140F.

I have also applied a layer of heat barrier tape outside of the battery chamber wall (Which is metal, that transfers heat from Engine bay into the battery chamber) . The heat barrier tape suppose to cut down radiant heat from Engine Bay by 98%.

 

cant really see anything.
Your vent either really is invisible or you need to post some better pix

 

I would suggest upgrading your radiator and fans. You should have no probs after that.


Matt
We install rad and fan kits.

 

Thanks, but what I am looking for is the opposite of you are offering.

Bigger radiator & fans, cool the Engine better but blow more heat into Engine Bay, in turn, Making the Engine run cooler but the Engine bay even hotter.

Since my oil Temp. meter is bellow the half way mark, the OE radiator & fans
are more than capable of handling the S/C. Bigger radiator & fans, if Engine oil cooling is not needed, as in my case, will only add dead weight & hinder the performance. I am not running a twin turbo on race track, in that case, bigger radiator may be necessary.

I am not looking to cool the Engine, I am looking to cool the Engine bay.

I will most likely swap in a Coupe/350Z Thermostat later, which activate the fan at 170F instead of 180F on my G35x. Again, it'll pull some heat away from Engine & release it into Engine Bay & most likely raise the engine bay temp. further, that's why my current focus is the Hood vent mod & lower under Hood Temp.

 

Why not custom fabricate a metal underpanel piece with many aero vents to protect and cool the engine bay better on the underside end of the engine (much better than the stock plastic piece), like the ARC aluminum under panel?

Obviously, heat rises, but the added vents might help w/ cooling the engine bay