DIY fiber hood

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bp944
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DIY fiber hood

Post by bp944 » Thu Aug 11, 2011 8:35 pm

I know its not the most practical way about it but I'd like to look at making my own carbon fiber hood. If I were just to make a skin could I use the old hood as a mold? Would that slight difference in shape really cause that much effect? I'm just going to put 4 hood pins into the car and not use any of the hood attachments at all. I've read quite a bit into how to lay it up and plan on doing a few simple things first.

Unkl Ian
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Re: DIY fiber hood

Post by Unkl Ian » Thu Aug 11, 2011 10:52 pm

Possible.
Please help make Speedtalk a Troll free zone.

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Re: DIY fiber hood

Post by Greaser » Fri Aug 12, 2011 1:39 pm

I just finished my daughter's Christmas present last month, a molded egg shaped chair built out of fiberglass clothe and epoxy. With out a doubt that was the biggest projects I ever did. Though not carbon fiber alot of the proceedures are the same. If I were to do it again I would have done several smaller projects and talked to alot of experienced people before starting it. Cost was double what I expected and took 10 times as long.

I got my supplies from US composites, they were very helpful.

Good luck.

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Re: DIY fiber hood

Post by Wannabe » Sat Sep 03, 2011 4:16 pm

I do it all the time. Funny-car bodies, hoods, cups, boats, tubs, speaker enclosures, etc.
If I can do it, you can do it.

CoMaxRacing
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Re: DIY fiber hood

Post by CoMaxRacing » Fri Sep 23, 2011 2:44 pm

I was looking at playing around with carbon fiber and the vacuum bagging seems to be the part that is the pain.

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Re: DIY fiber hood

Post by Wannabe » Fri Sep 23, 2011 8:23 pm

Then don't bag it. There is no harm in not bagging the carbon.
It is lighter if you can get the bagging to work and pull huge numbers, but it also becomes less fracture resistant. (Really, what is a little weight?)
We stopped bagging our boat hulls as leaving the resin in the lay-ups as the beatings these boats take are greatly aided by leaving the resin in and making them more impurvious to large bumps and slams on waves. Also good on certain parts of funny car bodies.
If you want some back yard DIY lightening, grab a sheet of heavy wax paper, then spray your mold release on the wax side and get ready. Then after everything is wet and saturated, lay the wax paper on and grab a squeegie. Squeegie out the extra resin and air to the outside of the part. Then after everything is activated, take the way paper off and have a semi-glossy backside to your part. Because we have found that pulling vacuum is most helpful in getting the air out first, then - second - getting the extra resin out. The wax paper trick does both.
But with the vacuum stuff, it can be tricky and costly. Why not make it really strong for really cheap? That is why we want carbon, right?

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Re: DIY fiber hood

Post by MRKING » Sun Sep 25, 2011 11:24 am

If your going to make a part from an overlay of the original . A cheap diy approach could be had with a little peel ply and some sand bags .Once you saturate the carbon fiber with your epoxy resin while being mindful of weave distortion , lay the peel ply over your part and cover it all with a good layer of sand up until the point where the equal weight distribution holds the impregnated fabric down . Once its all dry you can pull off the peel ply and the sand will lift with it . That will leave the typical appearance of having been vacuum bagged and from a hobbyist standpoint , no one will know .

prodriver555
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Re: DIY fiber hood

Post by prodriver555 » Sun Oct 09, 2011 3:07 pm

Company in the UK called Carbon Mods they have full ready to go kits for doing pieces and the mould kits too they are a great job i make pieces from their stuff too

PhilD
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Re: DIY fiber hood

Post by PhilD » Sun Nov 06, 2011 5:42 pm

Don't know if you've already finished this project, but I came across this interesting guide:
http://www.theturboforums.com/PBcarbonfiber.php

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Re: DIY fiber hood

Post by jsgarage » Thu Jan 05, 2012 3:30 pm

BP, is this just for appearance or for some race series? Reason I ask is, at higher speeds, a simple slab hood can buckle up like a newspaper in the wind, then when the car slows down, the excellent springing of the fiberglas will restore the shape and you're looking at trying to diagnose weird aerodynamics with no clues. Hot Rod magazine some years back ran photos of cars 'in the eyes' at drag strips across the country, and there were severely crumpled-up fiberglas parts showing at speeds as low as 120 mph. Incorporating reinforcement beams in fiberglas complicates your project a little but has benefits if you plan to go 'fast'. Sometimes, the reinforcing beams are urethane-foam-filled after hardening. As to supplies, Aircraft Spruce (home-built aircraft) sells fiberglas and carbon-fiber cloth, resins and so forth, quite resonably.

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Re: DIY fiber hood

Post by johnny5 » Mon Jan 16, 2012 9:39 pm

Normally you want to use the hood as a plug to make your mold

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Re: DIY fiber hood

Post by jus1975 » Mon Jun 19, 2017 9:43 pm

I want to try making a CF hood by using my factory hood to make the mold. But will the mold release agent stick to the paint of my factory hood. I dont want to damage the hood

j-c-c
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Re: DIY fiber hood

Post by j-c-c » Tue Jun 20, 2017 2:46 pm

The best mold release system/agent is PVA, sprayed on properly, its water soluble, low cost, easily removed or reapplied for each single use, there are other considerations, but it works well . Not sure its been mentioned, most of the skill set for doing fiberglass, is the same for CF, to achieve all of CF useful benefits, techniques like bagging as needed, but not required. And most of one's effort is usually spent in making a quality mold, which kinda sucks for a one off. Its also a lot easier if one is willing to have a finished painted CF item vs needing near perfect fabric lay for cosmetics, which also provides UV protection..

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Re: DIY fiber hood

Post by panic » Sun Jun 25, 2017 10:13 pm

No personal experience.
Of the people I know who did FG or CF, almost all got an acceptable product, but it was typically more work and money than they planned, and no, most wouldn't do it again.

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Re: DIY fiber hood

Post by midnightbluS10 » Thu Jun 29, 2017 8:40 am

jus1975 wrote:I want to try making a CF hood by using my factory hood to make the mold. But will the mold release agent stick to the paint of my factory hood. I dont want to damage the hood

You joined almost 5 years ago and finally made a post. Welcome!


What kind of car? Are you sure it wouldn't be cheaper to buy a hood?

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