knochgoon24
DSM Wiseman
- 6,135
- 92
- Jan 29, 2008
-
Troy,
Michigan
I work on my project, then I post on here, then I work on my project...etc.
At least this is slightly related.
At least this is slightly related.
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Here's a photo you may find interesting.
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This was after a weekend of driving about 750 miles in snowy conditions. 80% of it was highway miles at speeds >65mph.
You can see where there that sudden line on the hood where the little specks stop hitting. It's where the road grime would get pushed back along the hood instead of being splashed directly on it.
I bet that as long as most of your vent is behind where that line formed, you'll be golden.
(And yes, those icicles formed while I was driving. The weather was really poor during most of the trip. The intercooler froze over.)
Fantastic idea
My immediate reaction though is what about the heat from the turbo and that FP manifold? Do you have adequate heat shielding there? Because the ducting looks like it's right on top of it.
If you really want to test the downforce created, just make some type of a ride height sensor and do before and after testing at various speeds. You could make your own using a potentiometer attached to your front control arms, or pilfer one from a junker with self adjustable ride leveling.
If it shows a difference, simply stack sand bags on the car while parked to give yourself a value in pounds.
so are you just cutting a hole in the hood? If so, please consider a duck bill or some sort of raised surface right before the opening. Notice the raised area on the BMW that you posted.
Side note: I'm planning on integrating a gurney flap just ahead of the vent to help trip the air going over the hood and help pull the air out of the vent.
He did mention he plans on that.
Here's a photo you may find interesting.
I too have a great deal of very interesting picture of salt lines at highway speed. I have them from different angles and all outlined to show the patterns. If anyone is interested i could dig them out of the home computer.
this also may be of interest to the OP. I have a good relationship with a local company that did a redesign of an old Lotus Europa, here are the before and after pics. Before, After.
I am very familiar with that particular car and what might be of interest is the venting on the hood. obviously its mid engine so there is far less to dodge other than the luggage compartment. but pictures of the ducting and the fact that they managed to generate substantial downforce may still be of interest to you. If you would like i could dig for those too.
I have wanted to do a properly ducted hood on these cars for some time so i will be watching with great interest to see how it progresses.
I wonder about the effectiveness of this system vs a normally vented one. obviously the cooling benifits of this design are great. but I wonder how that will translate into reduced lift with the bottom of the engine bay open. closing it off would really get the front end to squat, but then you would need to be prepared to battle underhood temps. alot to be considered with this then.
If you're not road racing you probably don't see the point. But controlling underhood temps is one of the biggest challenges for road racing, especially on a turbocharged car. Look at any road race car and you'll see ducting like this. The fans don't cool the motor, they pull air through the radiator to cool the water running through the motor. It doesn't do any good to keep that air trapped inside the engine bay. It's far more effective if you can pass it through the hood, not to mention the better aero effects.What is the point of this? Wouldn't it be blocking the fan from doing it's job of cooling the motor since you will be blocking it? I'm sorry I just don't see this beneficial! Correct me if I'm wrong though and maybe I can learn something new today.