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- Verde
- Posts: 1552
- Joined: Mon Nov 29, 2004 7:06 pm
I agree with Mats on the point that venting the hood will allow more air to pass through the engine bay yielding greater drag.
BUT:
What if you combined the vented hood with some larger trays extending back from the bumper and a diffuser. You would have less air entering the engine compartment from below and lower pressure at the back of the radiator as a result. More air should then enter through the radiator. This air could then be vented through the hood. Theoretically you could have less drag than stock but with more air passing through the radiator (Or front mount intercooler if you are Greg). This could also yeild greater stability at high speeds due to less air passing under the car.
I know that this is a very complex proposal involving experimentation with an air pressure meter but someone could do it with time and not that much money. (There was a post about doing this sort of thing).
Am I making any sense here?
BUT:
What if you combined the vented hood with some larger trays extending back from the bumper and a diffuser. You would have less air entering the engine compartment from below and lower pressure at the back of the radiator as a result. More air should then enter through the radiator. This air could then be vented through the hood. Theoretically you could have less drag than stock but with more air passing through the radiator (Or front mount intercooler if you are Greg). This could also yeild greater stability at high speeds due to less air passing under the car.
I know that this is a very complex proposal involving experimentation with an air pressure meter but someone could do it with time and not that much money. (There was a post about doing this sort of thing).
Am I making any sense here?
The increase in drag when opening up a hood scoop is from the increase in flow through the radiator. Normally without the hood scoop the flow is out of the engine bay down under the car, this will still be there but you add airflow through the hood as well.
The proper way of doing it would be to seal off the front completely but a small opening for the radiator, this should be vented through a sealed channel behind the front wheels or at the front of the hood (not as effective but easier). If it's colder outside you can run a smaller opening and therefore have less drag (maybe equalized by the fact that denser air creates higher drag).
A sealed undertray would also be nice of course but that's a completely different system. It could be used to increase pressure in front of the radiator of course and then you can run an even smaller opening to the radiator.
Lot of work...
The proper way of doing it would be to seal off the front completely but a small opening for the radiator, this should be vented through a sealed channel behind the front wheels or at the front of the hood (not as effective but easier). If it's colder outside you can run a smaller opening and therefore have less drag (maybe equalized by the fact that denser air creates higher drag).
A sealed undertray would also be nice of course but that's a completely different system. It could be used to increase pressure in front of the radiator of course and then you can run an even smaller opening to the radiator.
Lot of work...
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
HOOD VENT PICS>>>
well here it is, and I must say, it looks pretty good...still in primer
will face rear, vents on top...have not decided how to attach it, probably big rivets
you can see the engine from the rear which is cool...
will face rear, vents on top...have not decided how to attach it, probably big rivets
you can see the engine from the rear which is cool...
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- Silver
- Posts: 47
- Joined: Thu Dec 30, 2004 6:58 am