DIY question: making vents for your bonnet

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Originally Posted by redefine

this pic is what WILL happen. raised bonnet or no.
if im correct the bolts will be stronger in tension, being steel, and a shear force is a combination of tension compression. steel is actually quite weak in compression (which is why we use concrete, and not steel for foundations, its the combined tensile strength of steel and compressive strength of concrete that makes reinforced concrete so good, but thats another point)

if the bolts were to shear off you would need an EXTREMELY rigid bonnet. like insanely rigid. considering the length of the bonnet, the cross-sectional area, and the compressive strength

and i rekon the carbon shards would have a better chance of scratching and getting in the eyes of bystanders then spearing you in any way. the firewall/windscreen do a great job of protecting you from shards of material

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Well actually... I'm still not sure about bolts being stronger in tension than shear, but shear is not a combination of tension and compression, it's just shear... and steel is equally strong in tension and compression, the issue is that if a steel member (say in a roof truss) is subject to compression without either having lateral restraint or being suitably 'stocky' it will buckle under the loading.

Concrete is used for building foundations because it can take on a large area whilst being relatively cheap compared to steel.


and yes, in order for the bonnet to spear you, you'd need to be very rigid so it won't buckle... but that means it'd be thick, and also heavy... I suppose that's undesirable isn't it

Hows that for a civil engineer's nerd-out!

whoops forgot about that :p your right about shear. i was thinking of a bending moment.

depends what you meant by strength. in both compression and tension it has the same modulus of elasticity, but the yield strength is much lower in compression. THATS what i was talking about. i shoulda been more specific.

i honestly dont see what people are afraid of about bonnets. even if the bolts do shear off, AND the bonnet is capable of piercing the glass windscreen, the angles that its at, the bonnet is likely to glance off and cover the windscreen then actually pass through it.

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Originally Posted by geeang

If you want vents, grab an angle grinder, cut some big holes in your bonnet, then drive into a tree.

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maybe he juss wants vents but hes too scared to say because of people like this that say dumb shit!!! not your car mate soo keep shit comments to urself.

^ i bet you have vents, lol

consider something like this http://www.hondatuningmagazine.com/f.../photo_25.html ? I think it would look ok and help feeding the air for your short ram or itb though