Ideas for 165 hood vents

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Re: Ideas for 165 hood vents

Postby UtahSleeper » Mon Apr 09, 2012 4:38 am

Looking forward to your idea. I am still kicking ideas around, but wont take priority till I get her running. When that happens I will buy a hood and figure out vents.
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Fri Apr 13, 2012 2:05 pm

Now that the vent has arrived, here are a few pictures:

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Can anyone guess what car this vent is from?
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Re: Ideas for 165 hood vents

Postby UtahSleeper » Fri Apr 13, 2012 3:01 pm

MR2?
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Fri Apr 13, 2012 3:29 pm

UtahSleeper wrote:MR2?


Yup!
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Mon Apr 16, 2012 1:40 pm

So here is some background aero research I've done on one of my older cars. The design is similar up front in many ways. I've started doing actual research on the 'Trac and once I finish my findings I will post up the results.

Quoting myself from NASIOC.
ZeroDrift wrote:I had an '86 Rx7. The shape and size of the hood vent played a large role in the cars aerodynamics. I bought a few spare hoods and made different designed vents. I did come across a design that actually helped front end stability, but it was through a fair amount of trial and error. I'll briefly mention my designs and results.

Design 1: Evo style open vented hood w/ no ducting.
Results: Front end lift at freeway speeds, and much lower under-hood temps while at low speeds.

Design 2: Traditional drop vent hood w/ no upper air guide.
Results: More front end lift at freeway speeds due to a larger low pressure pocket of air. Engine bay temps slightly greater than above design with greater stability in coolant temps.

Design 3: Traditional drop vent hood w/ a full duct and smaller exit than entrance.
Results: Front end was more stable than above designs and felt superior to an un-vented hood. Much more stable coolant temps under load.

First 2 pictures are of Design 1, and show the space available.

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Pressure zones seen below (Rx7): When inside the car, its high pressure, when outside the car lower pressure and higher airflow rates.

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The proposed MR2 vent will act much like my third design by causing the air to lift in a high velocity (low pressure) area of the hood. What is below the hood vent location is most likely to be a higher pressure area since the front of the car is effectively ramming the air into the engine bay. I will be verifying this information on the Alltrac though.
So by having the vent above the turbo, we should have an ideal low pressure zone, with a likely high pressure zone right below it. This is also the hottest part of the engine bay; the turbocharger. So if everything works out, this may very well be an elegant solution to our car's high under-hood temp issues.
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Re: Ideas for 165 hood vents

Postby UtahSleeper » Mon Apr 16, 2012 6:42 pm

Curious how this will turn out for you. I hope to start working on mine at the end of the month and still tossing ideas around in my head.

Plus something like this would give a potentially much cleaner install.
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Re: Ideas for 165 hood vents

Postby UtahSleeper » Sun Apr 29, 2012 4:39 pm

So, any luck.

I may end up going with a Mafix vent at the front and then and small universal vents at the back. Just an idea at the time.
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Mon Apr 30, 2012 2:36 am

Won't be installing the vent until I am ready to install my new turbo. Few weeks estimates at this point in time. However I will post up my initial aero findings shortly.
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Tue May 01, 2012 6:42 pm

Here is a quick render of my first batch of testing. More developments to come in the future.

http://www.youtube.com/watch?v=lBx9PyYo ... e=youtu.be
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Re: Ideas for 165 hood vents

Postby UtahSleeper » Wed May 02, 2012 3:03 pm

I will be keeping an eye on your tests. Could be some good info for us 165's.
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Re: Ideas for 165 hood vents

Postby LegacyofDan » Wed May 02, 2012 3:07 pm

very interesting, i look forward to seeing more.
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Re: Ideas for 165 hood vents

Postby BoostedBlueToyotas » Wed May 02, 2012 11:53 pm

Hmm, interesting to see a RX-7 scoop effort when the turbo models (88 RX7 turbo II) came with
a hood scoop stock. Interested to see what the MR2 one looks like. Seems to be too small to have in the middle of the hood and too large to have a pair of them on the side
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Thu May 03, 2012 12:12 am

BoostedBlueToyotas wrote:Hmm, interesting to see a RX-7 scoop effort when the turbo models (88 RX7 turbo II) came with
a hood scoop stock. Interested to see what the MR2 one looks like. Seems to be too small to have in the middle of the hood and too large to have a pair of them on the side



Thanks! My old Rx7 was swapped with the turbo components as the Sport chassis was lightest one available; however I was able to retain the light non-turbo aluminum hood (w/o the hood scoop). The whole project began as I had several spare steel hoods on hand to experiment with.

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Currently I am awaiting upon verification if this vent and placement is ideal as I don't have a spare hood available to experiment with. A second opinion is most welcome from people who have more experience than I in this department. The MR2 vent is a little odd to have in the center, while being too large to both sides. I think an offset vent is what I'm planning, or to cut the vent to make it more short and then place two of them on the car. Honestly I am also still considering other vent options out there as well.
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Re: Ideas for 165 hood vents

Postby ZeroDrift » Thu Jun 21, 2012 4:41 am

After much searching and reviewing of aero information I have settled on a vent. Its stainless and I will rivet it underneath the hood so only the vents are exposed. Should add approximately 80+ square inches of ventilation and will be placed behind the headlights.

Reasoning for the place is several fold and will be tested both before and after the installation. Firstly I don't want to have the heat from the engine bay enter the cabin through the vents at the base of the windshield. Secondly, air should spill off the side of the car better when there is a side draft and placed further back will allow air to better travel from the front to the rear. Concerns about the headlights being up are put to rest as they will be down for the hottest parts of the day and this is primarily when heat is at its peak, so its a bit of a compromise but a practical one for both placement and overall efficiency.

Image
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Re: Ideas for 165 hood vents

Postby bmt » Fri Jun 22, 2012 8:14 am

Those look awesome. I hope that they look as good on the car!! :D
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