Extraction above exhaust manifold
#1
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Hello all,
Got a big problem with heat in the engine bay when im on the throttle for any period of time. Ive got the mini scoop on the hood behind the rad and that works well, my issue is purely manifold heat related, to the point where it makes the paint on the underside of the hood tacky after a long run. I dont want to wrap the manifold beacuse a) it looks great b) it would be an a-hole to do and c) its stainless so would probably crack quicker.
I want to know if anyone has used an extraction vent above the manifold to pull this super heated air out of the engine bay. Judging by past posts on the pressure differential on the hood it looks like there is little difference above and below the hood in the turbo area and hence i assume little extraction effort.
Does anyone have any first had experiance ? Fabricating a vent is not an issue, i just dont want to cut a great big hole in the hood for it not to work. It would be in the area you can just see at the top of this image (where i have refelctive heat mat fitted) and maybe a little forward of this - but it is worryingly near the back of the hood !
Got a big problem with heat in the engine bay when im on the throttle for any period of time. Ive got the mini scoop on the hood behind the rad and that works well, my issue is purely manifold heat related, to the point where it makes the paint on the underside of the hood tacky after a long run. I dont want to wrap the manifold beacuse a) it looks great b) it would be an a-hole to do and c) its stainless so would probably crack quicker.
I want to know if anyone has used an extraction vent above the manifold to pull this super heated air out of the engine bay. Judging by past posts on the pressure differential on the hood it looks like there is little difference above and below the hood in the turbo area and hence i assume little extraction effort.
Does anyone have any first had experiance ? Fabricating a vent is not an issue, i just dont want to cut a great big hole in the hood for it not to work. It would be in the area you can just see at the top of this image (where i have refelctive heat mat fitted) and maybe a little forward of this - but it is worryingly near the back of the hood !
![](http://www.total-gtr.co.uk/upload/images/DSC00407.jpg)
#5
Tour de Franzia
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DEI Tunnel Matt is awesome. I use it on my fiberglass hood. I can race the car for 30-minutes, then sit in "park firme" for 15 minutes for weight and legality checks and it doesn't screw up the fiberglass hood.
#6
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I would think you would have to use a vent with something to cause turbulence to pull the air out through the opening in the hood.
I think a better solution would be a heat shield that attaches to your manifold bolts or valve cover bolts and goes over the turbo would be superior in every way.
If there is a hole in your hood it is a direct entry for water so then you'd have to not drive it in the rain/devise a way to channel the water away from the turbo/manifold.
I think a better solution would be a heat shield that attaches to your manifold bolts or valve cover bolts and goes over the turbo would be superior in every way.
If there is a hole in your hood it is a direct entry for water so then you'd have to not drive it in the rain/devise a way to channel the water away from the turbo/manifold.
#10
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You could probably make a decent looking shield attached to the hood with a slight air gap. I had used a cookie sheet attached by snaking nuts behind four of the holes in the hood frame with studs and locking nut from below.
I am sure with a little effort, something like this would work and leave your turbo area as it is.
I am sure with a little effort, something like this would work and leave your turbo area as it is.
#13
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If you're going to go with a stick on shield, DEI Reflect-a-gold is far and away the best stuff on the market. It's pricey, but worth it in every way. Don't put it on anything you don't want it to be on forever, though. The adhesive is sticky as heck and super temperature resistant.
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