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how to raise a gap for the front bonet?
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<blockquote data-quote="ninja_iga" data-source="post: 138690" data-attributes="member: 901"><p>itr,</p><p></p><p>thanks for the (now) intelligent discussion.</p><p>:P sorry guys......</p><p></p><p>well, using the low-pressure/ high-pressure theory to guide us where the air from the engine bay will come out or not,</p><p></p><p>here's something:</p><p></p><p>why the bonnets like these:</p><p>http://img.photobucket.com/albums/v77/kingauxs/z_Misc/front_hood_type_r_im.jpg</p><p></p><p>should work pretty well, is because the hole is in the LOW-pressure,high-speed zone. (the faster the air, the lower the pressure)</p><p>and it's right after the radiator :) </p><p>i've seen some fibre 'experts' put the vents IN FRONT of the radiator.. now that effectively reduces air from cooling the radiator la..... aiyo.</p><p></p><p>okie: </p><p>why doesn't the raised/popped bonnet let hot-air out? it worked for bonnet venting, doesn't it?</p><p>when stationary, YES the radiator fan blows the hot air out.</p><p>but when moving (fast enough la) the air from outside, actually gets pushed into the hole!</p><p>:huh: ??</p><p>how did that happened?</p><p></p><p>simple: that area is a high-pressure, low-airspeed zone. </p><p>How is that possible? </p><p>the windscreen. The air needs to SLOW down and 'climb' the windscreen. So the base of the windscreen is high-pressure (relatively) </p><p></p><p>don't you believe me? </p><p>well, our air-con air-intakes are THERE you know.. not even facing the front too! yet the air going thru the pipings-to-the-blower-to-pipings-to-your-face is still quite fast! (with the blower off) woah! try it with your car!</p></blockquote><p></p>
[QUOTE="ninja_iga, post: 138690, member: 901"] itr, thanks for the (now) intelligent discussion. :P sorry guys...... well, using the low-pressure/ high-pressure theory to guide us where the air from the engine bay will come out or not, here's something: why the bonnets like these: http://img.photobucket.com/albums/v77/kingauxs/z_Misc/front_hood_type_r_im.jpg should work pretty well, is because the hole is in the LOW-pressure,high-speed zone. (the faster the air, the lower the pressure) and it's right after the radiator :) i've seen some fibre 'experts' put the vents IN FRONT of the radiator.. now that effectively reduces air from cooling the radiator la..... aiyo. okie: why doesn't the raised/popped bonnet let hot-air out? it worked for bonnet venting, doesn't it? when stationary, YES the radiator fan blows the hot air out. but when moving (fast enough la) the air from outside, actually gets pushed into the hole! :huh: ?? how did that happened? simple: that area is a high-pressure, low-airspeed zone. How is that possible? the windscreen. The air needs to SLOW down and 'climb' the windscreen. So the base of the windscreen is high-pressure (relatively) don't you believe me? well, our air-con air-intakes are THERE you know.. not even facing the front too! yet the air going thru the pipings-to-the-blower-to-pipings-to-your-face is still quite fast! (with the blower off) woah! try it with your car! [/QUOTE]
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