How to make hood scoop functional?

[LilRoush]

If you cut a hole in the hood scoop to force air into the engine bay from the top, you'll loose performance. It's that simple. Why do something like that? If anything, you could add a reverse scoop to act as heat extraction, and even that on a street car isn't needed. But then again, I'm kinda new at all this car stuff, so I could be wrong.

This ad is not displayed to registered or logged-in members. Register your free account today and become a member on Mustang Forums!

[2004 V6 3.9]

Originally Posted by LilRoush

If you cut a hole in the hood scoop to force air into the engine bay from the top, you'll loose performance. It's that simple. Why do something like that? If anything, you could add a reverse scoop to act as heat extraction, and even that on a street car isn't needed.
But then again, I'm kinda new at all this car stuff, so I could be wrong.

the reason i want to is bc it would be cool, look better, be different from everyone else, and also i think you would be able to hear the engine better which is a plus... i also didnt think it would hurt anything, if anything i thought it would help cool the engine but i am the newbie here and i think your the expert lol so im taking your advice to just leave it alone.. can you just help me understand how it could hurt performance? besides wind drag

[bgnn32]

Originally Posted by Shaunmac9128

Hes just making a point...thats its not a good idea. Cutting the hood yourself can go south qucikly and whats the point if its just going to mess up air flow in the engine as it is and not do anything performance wise? Is there any reason to still do it other than to tell people when they ask that yes its a functioinal scoop?

So instead we will get 80 posts in this thread of people telling him it won't improve performance (which he already said he knows and doesn't care). It is one thing to point it out, but when it has already been pointed out, acknowledged and considered an non-issue then all that remains is answering the guys question, not continuing to beat a dead horse.

[LilRoush]

Originally Posted by 2004 V6 3.9

can you just help me understand how it could hurt performance? besides wind drag

Air flow is HUGE and not just due to drag. Proper air flow through the radiator keeps the engine cool, not air moving over the motor. If you impede how the air moves front to rear over the radiator fins, you'll hurt cooling. By forcing air in the top of the hood, you're blocking air from flowing through the radiator correctly. Instead of air going through the radiator and down under the car, it would be passing the radiaor, then hitting a variable speed down draft that will cause a swirl in the air.
On top of that, you are adding more air that will now have to go UNDER the car. Less air under the car is better. And what little does have to go under needs to be as smooth flowing as possible. Adding a down draft 1/3 the length of the car back (firewall), you're mixing it up even more. Mixing air under the car creates both drag, and high pressure under the car: 2 bad things in regards to performance.

[2004 V6 3.9]

0o0ooo ... now it makes alottaa sense. thanks for the info -- i guess if i do do anything that i'l have to make it airtight & hook it up to the intake which i know as everyone has said will give me just about no gains.. im going to wait a little while b4 i do anything thanks again

[Modular_Madness96]

Originally Posted by LilRoush

Air flow is HUGE and not just due to drag. Proper air flow through the radiator keeps the engine cool, not air moving over the motor. If you impede how the air moves front to rear over the radiator fins, you'll hurt cooling. By forcing air in the top of the hood, you're blocking air from flowing through the radiator correctly. Instead of air going through the radiator and down under the car, it would be passing the radiaor, then hitting a variable speed down draft that will cause a swirl in the air.
On top of that, you are adding more air that will now have to go UNDER the car. Less air under the car is better. And what little does have to go under needs to be as smooth flowing as possible. Adding a down draft 1/3 the length of the car back (firewall), you're mixing it up even more. Mixing air under the car creates both drag, and high pressure under the car: 2 bad things in regards to performance.

ITS A V6!Jesus christ the kid has said on numerous posts its simply for looks!

And as for your claims i personally think youre an idiot!Plain and simple!This isnt NASCAR its a street driven V6 mustang all the racing stuff doesnt apply.I have functional aftermarket hoods with scoops on all of my mustangs and havent felt any differences!

Hes speaking of cutting what an 8x2 slit in his hood for looks how is that going to kill performance?My 89 coupe has a COBRA R SVO hood with the scoop cut out and functional,both of my 84's have the GT hoods with the hood again cut out,and last but not least my 96 GT has the MACH II hood and yes its cut out and again no performance loss.

The only thing i have noticed is that the temps stay a little lower on the highway.

Just an FYI if your coolant system works properly you could run around with no hood if you wanted and still have no issues.

[crbakp10]

Not sure if you read the entire thread or not but he was answering the guys question on why HE thought it would be a bad i idea....

Originally Posted by Modular_Madness96

ITS A V6!Jesus christ the kid has said on numerous posts its simply for looks!

And as for your claims i personally think youre an idiot!Plain and simple!This isnt NASCAR its a street driven V6 mustang all the racing stuff doesnt apply.I have functional aftermarket hoods with scoops on all of my mustangs and havent felt any differences!

Hes speaking of cutting what an 8x2 slit in his hood for looks how is that going to kill performance?My 89 coupe has a COBRA R SVO hood with the scoop cut out and functional,both of my 84's have the GT hoods with the hood again cut out,and last but not least my 96 GT has the MACH II hood and yes its cut out and again no performance loss.

The only thing i have noticed is that the temps stay a little lower on the highway.

Just an FYI if your coolant system works properly you could run around with no hood if you wanted and still have no issues.

[Shaunmac9128]

madness, how is it for looks? The hole is under the scoop therefore...you cant see it, what looks? And your right, our cars arn't nascar cars but airflow is very important in any car from ours to a minivan. Infact (motortrend) I think something like 10-25% of a cars fuel mileage is dependent on the cars aerodynamics, granted thats a little more complicated than a hood scoop.

[2004 V6 3.9]

Originally Posted by Shaunmac9128

madness, how is it for looks? The hole is under the scoop therefore...you cant see it, what looks? .

it doesnt realy matter what i want to do it for.. i just wanted to know if it was possible without any negative affect. but as far as looks I think any car person would notice if it was open/fuctional

[StangKid018]

Ive never had any problems with rain, never driven it in falling snow but id imagine its not different. It comes with hoses that drain any water under the engine bay both on the outside of the shaker and inside the scoop.