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taffrican



Member Since: 14 Jan 2011
Location: Living room
Posts: 624
Wales 2002 Defender 90 Td5 HT Java Black
why the holes?
I'm a little bit puzzled as to why a lot of Defenders have the 3 holes cut out of each side of the bonnet, on the side (where the bonnet meets the wing top)... it looks pretty cool, but what's the purpose? cooling? air flow? Whistle I'll get my coat Whistle
Post #160677 8th Aug 2012 4:38am
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quentin



Member Since: 23 Jul 2012
Location: on tour
Posts: 119
Australia 2004 Defender 110 Td5 SW Alpine White
Ive never seen them before so googled it & came up with this.
http://home.mweb.co.za/mo/moorea/zulu.html

Neat Defender but I'd never do that to my bonnet, - ugly

It mentions bonnet cooling holes in his list
Doubt it would really do much to aid cooling, meybe for one of those hot running petrol engines, but not a diesel.
if it got that hot under the bonnet I'd hate be sitting in the car when its 45+ c in the shade

Last edited by quentin on 8th Aug 2012 10:35am. Edited 1 time in total
Post #160681 8th Aug 2012 5:38am
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6092
United Kingdom 2006 Defender 110 Td5 SW Epsom Green
They're speed holes Whistle Whistle Whistle
Post #160689 8th Aug 2012 6:43am
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ibexman



Member Since: 13 Dec 2008
Location: Essex
Posts: 2945
United Kingdom 
S the spiders can get out Whistle Whistle
Post #160737 8th Aug 2012 10:34am
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Glynparry25



Member Since: 16 Feb 2009
Location: Miserable Midlands
Posts: 3015
Wales 2009 Defender 110 Puma 2.4 XS DCPU Tonga Green
This goes back to drag racing/ street racing.

Cold air enters your engine bay through the grill...... it then can only escape one way- down and under the vehicle. This means the air at the top and back of the engine bay is able to get hotter and hotter. On regular cars they 'Space the hood' which allows airflow to leave the top rear of the engine bay which promotes air flow through the whole engine bay................ and in theory helping to cool the whole engine bay down.

On a Defender you can't 'Space the hood' so you can get a similar effect by drilling holes as you have seen. But this won't work really well as you will still have all the heat build up in the top rear center.

I guess it is up to you if you feel it will be beneficial!!

here is a guide for cars: http://www.youtube.com/watch?v=zIZa1WXE3Io

Glyn Dog Sheep
Post #160746 8th Aug 2012 12:09pm
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quentin



Member Since: 23 Jul 2012
Location: on tour
Posts: 119
Australia 2004 Defender 110 Td5 SW Alpine White
Now that you mention it,
heres a pic of my recently departed BJ40, it had the factory flutes on both sides, very toyota, Still would not look right on a defender tho I have seen them on the hot running Leyland P76 4.4 powered RRC's but never looked right.


Click image to enlarge
Post #160751 8th Aug 2012 12:22pm
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