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Tiger racing hoods.
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<blockquote data-quote="99COBRA2881" data-source="post: 11454809" data-attributes="member: 12178"><p>I said back in August that Id post pics of my hinged DIY lift off hood. </p><p></p><p><em>Background.</em></p><p>I bought the hood 4-5 years ago with the intentions to run it as a pin on hood. The wind blew it over once last year and I decided lift off hoods suck. The hood is an 03/04 cervinis lift off hood, its made to fit the 99-01 front bumpers. It weighs about 22 lbs compared to the 40+lbs that the Cervinis '00R hood weighs. -20 lbs on the nose, up high is a pretty good minus. </p><p></p><p><em>How I did it.</em></p><p>I tried calling a popular composite supply house to get some low density foam but never got anywhere with expaining to the guy on the phone that I didnt need structural foam but I simply needed a foam that would act as a mold for the carbon fiber and fiberglass to lay over top off. He never got it. </p><p></p><p>So in frustration I bought a can of yellow expando foam house insulation. I sat the hood upside down on a table and put two large globs of foam about where the hinges should be on either side of the hood. I gently shook and tapped on the hood to help the foam settle and remove air pockets. This worked suprisingly well.</p><p></p><p>I borrowed my wife's hair dryer and put some heat to the foam to help the center of the foam cure. I also heated the underside of the hood to get as much heat through the foam as I could.</p><p></p><p>After two days I set about cutting the foam down to shape by hand. A fine toothed 6" sawzall blade worked great to saw through the foam. It cut about like the consistency of a loaf of bread. Pretty soon I had two identical long pyramid like foam shapes on the hood. I sawed the tops off to get them down to the height of the stock hoods finished underside. </p><p></p><p>I cleaned up the foam and laid the first layer of resin soaked fiberglass over the foam. I let it cure overnight then laid up another layer of f/g 45° off the grain of the first layer. Again I waited over night to let this cure then laid up a layer of carbon fiber. After the first layer of carbon fiber cured over night (Starting to see a pattern here?) I used a two part epoxy to glue the hood bolts into place. </p><p></p><p>Positioning of the hood bolts took an idiotic amount of measurement, remeasurement, reposition, measure again, move alittle more, measure again compare to the other side, remeasure, adjust, screw up, reposition and on and on. It took a long while to get the bolts exactly where I wanted them. It paid off though because as I sat the hood onto the car all four bolts slipped right down into the 1/4" holes in the stock hood hinges!! Being particular and having great attention to detail is usually more of a pain in the ass than a benefit, this time it paid off.</p><p></p><p>I let the bolts cure overnight then laid the final layer of c/f over the top of the bolts. I didnt vaccuum bag because I didnt have the equipment or the luxury of waiting on the brown truck to bring it to me. I did lay the hood out in the Kansas August sun to cure. I measured temps on the hood above 180°.</p><p></p><p>I did have to shim the hood with two 3/8" rubber bushings on each side to get the sides of the hood level with the fenders. This actually worked well due to the bushings having some damping effect to them with the vibration that the hood sees when the car is on track at race speed.</p><p></p><p>The results are below. Enjoy!! :beer:</p><p></p><p> </p><p>[ATTACH=full]280228[/ATTACH]</p><p></p><p>[ATTACH=full]280229[/ATTACH]</p><p></p><p>[ATTACH=full]280230[/ATTACH]</p><p></p><p>[ATTACH=full]280231[/ATTACH]</p><p></p><p>[ATTACH=full]280232[/ATTACH]</p><p></p><p>[ATTACH=full]280233[/ATTACH]</p></blockquote><p></p>
[QUOTE="99COBRA2881, post: 11454809, member: 12178"] I said back in August that Id post pics of my hinged DIY lift off hood. [I]Background.[/I] I bought the hood 4-5 years ago with the intentions to run it as a pin on hood. The wind blew it over once last year and I decided lift off hoods suck. The hood is an 03/04 cervinis lift off hood, its made to fit the 99-01 front bumpers. It weighs about 22 lbs compared to the 40+lbs that the Cervinis '00R hood weighs. -20 lbs on the nose, up high is a pretty good minus. [I]How I did it.[/I] I tried calling a popular composite supply house to get some low density foam but never got anywhere with expaining to the guy on the phone that I didnt need structural foam but I simply needed a foam that would act as a mold for the carbon fiber and fiberglass to lay over top off. He never got it. So in frustration I bought a can of yellow expando foam house insulation. I sat the hood upside down on a table and put two large globs of foam about where the hinges should be on either side of the hood. I gently shook and tapped on the hood to help the foam settle and remove air pockets. This worked suprisingly well. I borrowed my wife's hair dryer and put some heat to the foam to help the center of the foam cure. I also heated the underside of the hood to get as much heat through the foam as I could. After two days I set about cutting the foam down to shape by hand. A fine toothed 6" sawzall blade worked great to saw through the foam. It cut about like the consistency of a loaf of bread. Pretty soon I had two identical long pyramid like foam shapes on the hood. I sawed the tops off to get them down to the height of the stock hoods finished underside. I cleaned up the foam and laid the first layer of resin soaked fiberglass over the foam. I let it cure overnight then laid up another layer of f/g 45° off the grain of the first layer. Again I waited over night to let this cure then laid up a layer of carbon fiber. After the first layer of carbon fiber cured over night (Starting to see a pattern here?) I used a two part epoxy to glue the hood bolts into place. Positioning of the hood bolts took an idiotic amount of measurement, remeasurement, reposition, measure again, move alittle more, measure again compare to the other side, remeasure, adjust, screw up, reposition and on and on. It took a long while to get the bolts exactly where I wanted them. It paid off though because as I sat the hood onto the car all four bolts slipped right down into the 1/4" holes in the stock hood hinges!! Being particular and having great attention to detail is usually more of a pain in the ass than a benefit, this time it paid off. I let the bolts cure overnight then laid the final layer of c/f over the top of the bolts. I didnt vaccuum bag because I didnt have the equipment or the luxury of waiting on the brown truck to bring it to me. I did lay the hood out in the Kansas August sun to cure. I measured temps on the hood above 180°. I did have to shim the hood with two 3/8" rubber bushings on each side to get the sides of the hood level with the fenders. This actually worked well due to the bushings having some damping effect to them with the vibration that the hood sees when the car is on track at race speed. The results are below. Enjoy!! :beer: [ATTACH=full]280228[/ATTACH] [ATTACH=full]280229[/ATTACH] [ATTACH=full]280230[/ATTACH] [ATTACH=full]280231[/ATTACH] [ATTACH=full]280232[/ATTACH] [ATTACH=full]280233[/ATTACH] [/QUOTE]
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