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PostPosted: Thu Aug 09, 2018 7:16 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
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Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
Have drill, have angle grinder, will vent......it might not be pretty :wink: :lol:

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PostPosted: Thu Aug 09, 2018 7:47 pm 
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Joined: Mon Feb 19, 2007 4:12 pm
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Location: Portsmouth
Car Model: 96 V4 & 9-3 Turbo-X
Stick some rubber edging around the hole to hide the worst of the grinders work (and make the edge safer) and put some mesh under it to keep debris out.

Using a dremel will take longer but give more control over the hole shape.

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PostPosted: Thu Aug 09, 2018 8:10 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
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Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
Might have a few more things to deal with first, but I've decided that I may as well get the bugger back out on the road and terrorising Astons again.

The big rad will help massively. Opening up the front bumper and crash bar, then venting the bonnet...I've got a massive sheet of wide plastic mesh for the front, the bonnet will need something finer to stop stuff getting in. It's all there, I just need some time without other demands to make the ruddy thing happen! I'll get there, eventually.........

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PostPosted: Thu Aug 09, 2018 9:49 pm 
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Joined: Mon Feb 19, 2007 4:12 pm
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Location: Portsmouth
Car Model: 96 V4 & 9-3 Turbo-X
Fliptop wrote:
It's all there, I just need some time without other demands to make the ruddy thing happen!


Dont we all!

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PostPosted: Fri Aug 10, 2018 9:35 am 
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Joined: Thu Dec 24, 2015 8:25 pm
Posts: 1870
Location: Lingfield, Surrey
Car Model: 93 Aero 2.8T cabrio
Is it worth buying a spare bonnet to hack about with and mock up vents on?

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PostPosted: Fri Aug 10, 2018 4:28 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
Posts: 21553
Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
On mine, no, the car's not pretty enough to care too much :wink:

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PostPosted: Fri Aug 10, 2018 6:16 pm 
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Location: Bedfordshire
beardydave wrote:
Yep.


In fact they can be in any area of pressure lower than the inside of the engine bay. The easiest one to get to is at the front of the bonnet, but lips and other bits can create areas of low pressure (safari vents on a v4 for example). Wheel arches are also low pressure, but holes and vents in them will let water and mud in from puddles


No, not necessarily to the bonnet vents. The links earlier on in the thread illustrate why they don’t always work. If the air pressure underneath is lower than on top, then air could be drawn in from the top rather than exit. It really needs wind tunnel proving


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PostPosted: Sat Aug 11, 2018 7:29 am 
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Joined: Thu May 24, 2012 8:12 pm
Posts: 1720
Location: Blandford Forum
Car Model: All of them.
Regarding an earlier comment about vents letting in water/mud this really only applies to low sited vents that take heat away from brakes and wheel arch area. That's possible to safeguard against by using mesh and the angle of the vent.

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PostPosted: Sun Aug 12, 2018 1:34 pm 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
Posts: 19190
Location: Maidstone
Car Model: 9-5 Aero
Mark E wrote:
beardydave wrote:
Yep.


In fact they can be in any area of pressure lower than the inside of the engine bay. The easiest one to get to is at the front of the bonnet, but lips and other bits can create areas of low pressure (safari vents on a v4 for example). Wheel arches are also low pressure, but holes and vents in them will let water and mud in from puddles


No, not necessarily to the bonnet vents. The links earlier on in the thread illustrate why they don’t always work. If the air pressure underneath is lower than on top, then air could be drawn in from the top rather than exit. It really needs wind tunnel proving


The autospeed.com website I mentioned earlier does a lot of what could be called heath Robinson real world testing. However, the science behind it is good and the results worthwhile and most importantly repeatable across a range of vehicles.
For the testing of vents, some wool tufts, masking tape and a home made manometer would suffice.

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