Heat shield under hood scoop
Try it and tell you what? How much faster the car will be with a larger inlet on the shield under the NACA duct? It's not going to do anything besides let more air into the back of the engine bay. It'll evacuate the heat coming off the turbo and downpipe better, but how are you going to measure that?
I never said making the shield inlet bigger would be awesome and amazing, I just said I don't buy the fact that "It's made that way for a reason, so leave it alone." Common sense would tell you that a larger opening would let in more air and allow the duct to do it's job better.
I never said making the shield inlet bigger would be awesome and amazing, I just said I don't buy the fact that "It's made that way for a reason, so leave it alone." Common sense would tell you that a larger opening would let in more air and allow the duct to do it's job better.
Unless we get a Mitsu engineer that designed the aero dynamics and the functions of the hood scoop and purpose. This debate will go one forever.
One can argue that a bigger opening is better, vs. a smaller opening that squeezes the air and creates more pressure shooting it into the engine bay.
This is the only thing I found on the subject. Straight from Mitsu engineers.
Originally Posted by Aerodynamics for LANCER EVOLUTION X
Satoshi KATAOKA* Norimasa HASHIMOTO* Masahiro YOSHIDA*
Tomio KIMURA* Naoki HAMAMOTO*
Satoshi KATAOKA* Norimasa HASHIMOTO* Masahiro YOSHIDA*
Tomio KIMURA* Naoki HAMAMOTO*
Abstract
Aerodynamics technology for the LANCER EVOLUTION X was developed not only to reduce
drag but also improve lift and cooling performance. The applied aerodynamics technology includes
the nose shape like that of a shark, the cooling, the rear spoiler shape, etc. As a result, the drag
coefficient (CD) and lift coefficient (CL) values are less than that of the LANCER EVOLUTION IX. This
paper describes the aerodynamics technology for the LANCER EVOLUTION X and also introduces
the Under Floor Air Guide, a new aerodynamic device.
For cooling, the hood inlet, based on
the NACA scoop shape, and hood outlet which have
adopted from LANCER EVOLUTION IX, and the new
fender outlets located at suitable positions on the body
surface enhance the cooling performance for the
engine compartment.
Aerodynamics technology for the LANCER EVOLUTION X was developed not only to reduce
drag but also improve lift and cooling performance. The applied aerodynamics technology includes
the nose shape like that of a shark, the cooling, the rear spoiler shape, etc. As a result, the drag
coefficient (CD) and lift coefficient (CL) values are less than that of the LANCER EVOLUTION IX. This
paper describes the aerodynamics technology for the LANCER EVOLUTION X and also introduces
the Under Floor Air Guide, a new aerodynamic device.
For cooling, the hood inlet, based on
the NACA scoop shape, and hood outlet which have
adopted from LANCER EVOLUTION IX, and the new
fender outlets located at suitable positions on the body
surface enhance the cooling performance for the
engine compartment.
As an engineer i looked at the duct and it does appear on first glance to be somewhat restrictive. But I believe this was done as someone stated to prevent random debris from falling into the turbo area. True, having the two smaller restrictors will increase air speed, but i'm not sure it will increase air FLOW.
Of course, this is all swag and unproven. But if it means anything to anyone, I will be removing the restrictor because it's my opinion that they're more restrictive than they're worth. Anyone doing this should put some form of mesh on it to prevent leaves from falling through and starting an engine bay fire.
Of course, this is all swag and unproven. But if it means anything to anyone, I will be removing the restrictor because it's my opinion that they're more restrictive than they're worth. Anyone doing this should put some form of mesh on it to prevent leaves from falling through and starting an engine bay fire.
Regardless, what common sense tells you. Many times it is not correct. That is why you need hard mathematical data to back up everything that common sense tells you.
Unless we get a Mitsu engineer that designed the aero dynamics and the functions of the hood scoop and purpose. This debate will go one forever.
One can argue that a bigger opening is better, vs. a smaller opening that squeezes the air and creates more pressure shooting it into the engine bay.
This is the only thing I found on the subject. Straight from Mitsu engineers.
Unless we get a Mitsu engineer that designed the aero dynamics and the functions of the hood scoop and purpose. This debate will go one forever.
One can argue that a bigger opening is better, vs. a smaller opening that squeezes the air and creates more pressure shooting it into the engine bay.
This is the only thing I found on the subject. Straight from Mitsu engineers.
I believe the NACA duct was designed a certain way to be the most effective, but the shield underneath is more likely to keep water and debris out of the engine bay, because it is a street car meant for many different environments and climate conditions. If it was built to be a race car, that shield wouldn't even be there, and the duct would offer the maximum amount of flow.
Of course I have no way to prove this, but a little common sense goes farther than you think.
Thread Starter
Evolved Member
iTrader: (17)
Joined: Jan 2009
Posts: 1,326
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From: Arcadia, CA
would give us a tiny piece of 3m for the rear impact area when the impact area is far wider, whether or not the rear diffuser is more cosmetic than functional, etc.but if i have to put it along your lines, then i suppose you could say it's a cheap mod. i wouldn't say i "need" to do it, but more like "why not?"
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Joined: Apr 2023
Posts: 1
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From: shawinigan, Quebec
heat shield
The whole idea of "Leave it alone, it was designed that way"..... I don't buy it.
NACA ducts are meant to provide low drag, efficient air inlets and are designed without shields to block the flow. It's more likely the shield is meant to keep the heat away from the plastic duct and to keep water and other debris from getting into the engine bay. I'd be willing to bet that it'll defnitely flow better with larger openings cut into the shield, or just removing the shield all together.
NACA ducts are meant to provide low drag, efficient air inlets and are designed without shields to block the flow. It's more likely the shield is meant to keep the heat away from the plastic duct and to keep water and other debris from getting into the engine bay. I'd be willing to bet that it'll defnitely flow better with larger openings cut into the shield, or just removing the shield all together.
If i decide to remove the heat shield completely will I have heat issues? the previous owner broke the heat shield clips and im thinking of just leaving it off all together. im in canada,qc its hot in the summer but not overwhelmingly hot.
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