Cooling engine compartment
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
I was thinking the same thing. Here is some info I copied off AEV's website regaurding the hood
JK Heat Reduction Hood FAQ
Does the Heat Reduction Hood really reduce temperatures?
Absolutely! Of course we designed the hood to be aesthetically pleasing, but we also put a lot of fluid analysis into the location of the vents. There is a low-pressure area created at the front edge of the hood when the vehicle is in motion, and we placed the central vent of the hood in a position to take advantage of this. Since air likes to move from high pressure to low pressure areas, the placement of the center vent causes cooler outside air to be sucked through the radiator and up through the hood to fill in the low-pressure area.
Chrysler has tested our hood in both the wind tunnel and on one of their most severe hot weather tests, the Davis Dam Grade outside of Laughlin NV. This is about a 15-mile grade with very high engine RPMs, high ambient temperatures, and high loads. Here are some excerpts from Chrysler’s “hot trip” report: “3.8L engine coolant temps ran approximately 5 degrees less with the AEV Hood. AEV hood was then put on a diesel (2.8L) JK and very positive results were experienced. The vehicle ran 5 – 7 mph faster up the grade with a trailer.”
When Chrysler subjected the hood to a different test in the wind tunnel, the results were similar “DAVIS and USCTY were run to evaluate AEV hood. AEV hood helped coolant temp (2.5 degF), Trans temp (4 degF) and Air box inlet Air temp (8 degF). It also helped some thermal protection components during Davis55.”
Besides engine performance, the AEV Hood can help significantly with the heat buildup in the under hood electronics, such as the TIPM (Total Integrated Power Module) which will shut the entire vehicle down if it gets too hot. Don’t be fooled by other hoods that are designed solely for aesthetics, they won’t help cool your vehicle (many have the vents placed in useless areas from a thermal dynamics perspective).
Last Updated on Tuesday, 20 December 2011 09:56
JK Heat Reduction Hood FAQ
Does the Heat Reduction Hood really reduce temperatures?
Absolutely! Of course we designed the hood to be aesthetically pleasing, but we also put a lot of fluid analysis into the location of the vents. There is a low-pressure area created at the front edge of the hood when the vehicle is in motion, and we placed the central vent of the hood in a position to take advantage of this. Since air likes to move from high pressure to low pressure areas, the placement of the center vent causes cooler outside air to be sucked through the radiator and up through the hood to fill in the low-pressure area.
Chrysler has tested our hood in both the wind tunnel and on one of their most severe hot weather tests, the Davis Dam Grade outside of Laughlin NV. This is about a 15-mile grade with very high engine RPMs, high ambient temperatures, and high loads. Here are some excerpts from Chrysler’s “hot trip” report: “3.8L engine coolant temps ran approximately 5 degrees less with the AEV Hood. AEV hood was then put on a diesel (2.8L) JK and very positive results were experienced. The vehicle ran 5 – 7 mph faster up the grade with a trailer.”
When Chrysler subjected the hood to a different test in the wind tunnel, the results were similar “DAVIS and USCTY were run to evaluate AEV hood. AEV hood helped coolant temp (2.5 degF), Trans temp (4 degF) and Air box inlet Air temp (8 degF). It also helped some thermal protection components during Davis55.”
Besides engine performance, the AEV Hood can help significantly with the heat buildup in the under hood electronics, such as the TIPM (Total Integrated Power Module) which will shut the entire vehicle down if it gets too hot. Don’t be fooled by other hoods that are designed solely for aesthetics, they won’t help cool your vehicle (many have the vents placed in useless areas from a thermal dynamics perspective).
Last Updated on Tuesday, 20 December 2011 09:56
The AEV/Chrysler research seems to indicate the vent does no harm (at least a few degrees in temp reduction) at highway speed. This means if you install it mainly to let hot air out of the engine bay when going slow, on the trail, (where it may do the most good), you won't be reducing cooling efficiency on the road.
JK Enthusiast
Joined: Dec 2009
Posts: 138
Likes: 0
From: Marquette, MI
2008 JK Mechanical Fan updates - parts arrived
Greetings,
the parts arrived today for the Mech Fan project, fan blade looks great, 11 blade nice construction, Hayden HD Thermal clutch # 2738 should be here by the end of the week. I received the cooling shroud as well... ronjenx, you were right - the shroud i received was a stock electrical shroud, so I ordered Part # 55057123AB to see if this will fit the mechanical fan.
I will post pictures once i start the install..... cheers
the parts arrived today for the Mech Fan project, fan blade looks great, 11 blade nice construction, Hayden HD Thermal clutch # 2738 should be here by the end of the week. I received the cooling shroud as well... ronjenx, you were right - the shroud i received was a stock electrical shroud, so I ordered Part # 55057123AB to see if this will fit the mechanical fan.
I will post pictures once i start the install..... cheers
JK Super Freak
Joined: Feb 2011
Posts: 1,106
Likes: 1
From: Houston,TX
JK Enthusiast
Joined: Oct 2008
Posts: 409
Likes: 0
From: Raleigh,NC
Greetings,
the parts arrived today for the Mech Fan project, fan blade looks great, 11 blade nice construction, Hayden HD Thermal clutch # 2738 should be here by the end of the week. I received the cooling shroud as well... ronjenx, you were right - the shroud i received was a stock electrical shroud, so I ordered Part # 55057123AB to see if this will fit the mechanical fan.
I will post pictures once i start the install..... cheers
the parts arrived today for the Mech Fan project, fan blade looks great, 11 blade nice construction, Hayden HD Thermal clutch # 2738 should be here by the end of the week. I received the cooling shroud as well... ronjenx, you were right - the shroud i received was a stock electrical shroud, so I ordered Part # 55057123AB to see if this will fit the mechanical fan.
I will post pictures once i start the install..... cheers
JK Super Freak
Joined: Feb 2011
Posts: 1,106
Likes: 1
From: Houston,TX
There's great write ups on this elsewhere... my snorkel setup won't allow me to do it so I run an autozone lifetime replacement fan for 130 with a kill switch for crossings and hope to get a hood louver for bday
JK Newbie
Joined: Jun 2012
Posts: 11
Likes: 0
From: St. Petersburg, FL
Obviously the AEV heat reduction hood looks sweet but it is pretty expensive. The cheaper option is the Poison Spyder hood vents. It is way cheaper, keeps your engine compartment cool, and look pretty bad ass!