Vent above turbo?

[Redneckintraining]

I was thinking about putting a vent in the hood above the turbo,It might help abit with EGT's.I have seen diagrams on airflow over the hood and where heat tends to build up under the hood. At the leading edge of the hood vaccum is highest,at the windshield its positive pressure. All of the heat in an engine bay gathers right behind the radiator and right at the firewall by the sides of the engine(the diagram was for a heep with the 4.0 inline six) even on N/A gassers. One of those heat areas is pretty much exactly where the turbo is.So as you are driving the turbo is bathed in 130*+ ambient air temps plus however hot the turbo itself is. Directly above the turbo is an area of vacuum.So I am thinking if I put a vent above the turbo it might draw some of the heat away from the turbo.That in theory could drop EGT's like 10-20 degrees.It also in theory would allow a slightly colder air intake because the exhaust housing isnt heating the compressor. Not to mention the above mentioned hot stagnant air surrounding the turbo.

What do you all think?It certainly isnt a new truck with a nice paintjob im talking about.

[redneckroot]

If you have a pyro I would pull the whole hood and take it up the road to test the theory, even though it would be more air, it would let you know if it would be enough to affect it. That way you didn't junk your hood to find out it doesn't work. I personally would rather not have an opening that draws in the rain and everything else onto the top of my motor, but it would be interesting to know.

[Redneckintraining]

removing the hood wouldnt provide a clean vacuum to draw the heat away.

[skilletky]

i drove around for about 2 months with no hood and did not see any differance, until i made an intake that stuck the filter up above the grill. if it didn't look so goofy i would have left it.

[Richie O]

When I was a kid me and my buddy got pulled over because we had no hood. I think we were rednecks.

[Begle1]

The way I see it, the air inside of the engine and turbo has a lot more to do with EGT's than the air around the turbo.

It'd be a lot more effective to cut a hole or louvers in the hood for the air intake to breath through.

[1991cummins]

i thought the vary same thing as begle as soon as i read this... its just doesnt make plus, even if that reduces them, its still just as hot inside your combustion chamber, and melting a piston is no good either...

[SChandler]

I think it would have more of an effect on the coolant temperature than anything else. Those hood vents are typically marketed to people with vehicles with known cooling problems. I've seen some of the off road magazines install them on Jeep Cherokees to reduce engine coolant temps. They can help there, but I don't think EGT's will be reduced by their usage.