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Old 10-14-2011, 11:52 AM
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Carbon Fibre Petrol Tank

Hi There,
As I am not that good at welding, and quite good at woodwork, I thought I would make a Carbon Fibre petrol tank for my bike. I have no fear of making the plug and laying-up the carbon fibre.
My question is; knowing how aggressive modern petrol is, what type of resin would be most suited? Or should I line the finished tank with "Flowliner" or some similar protective coating?
Any advice would be most appreciated.
Thanks
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Old 10-14-2011, 01:34 PM
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Tank

Quote:
Originally Posted by olorin
Hi There,
As I am not that good at welding, and quite good at woodwork, I thought I would make a Carbon Fibre petrol tank for my bike. I have no fear of making the plug and laying-up the carbon fibre.
My question is; knowing how aggressive modern petrol is, what type of resin would be most suited? Or should I line the finished tank with "Flowliner" or some similar protective coating?
Any advice would be most appreciated.
Thanks
Welcome to the site.

I guess I would look at it worst case, crash. Would that tank break, if you laid it down maybe not, but if you hit something where it put a impact on the tank, how much could it take before even just cracking.

I'm not up on bikes, so if they are already using Carbon Fibre then I would put a rubber bladder in it and go for it.

Bob
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Old 10-14-2011, 02:28 PM
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Thanks for the reply Bob, and your perspective.
I am not worried about the tank breaking during a crash, (which is always a possibility), but more the corrosion from within. I will look into the inner bladder idea.
Thanks for your time.
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Old 10-16-2011, 12:15 AM
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there is a certain kind of resin for that which the name of escapes me right at this moment..we made a number of tanks for boats when I worked at the boat builders..Most of your glass suppliers have that tech info..

Sam
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Old 10-16-2011, 01:40 AM
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This will get you headed in the right direction though it is a long one.
http://www.bayarearidersforum.com/fo...d.php?t=145975

you can do it
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Old 10-16-2011, 02:54 AM
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Thanks for the input Sam and Milo.
Sam; I did some more research and the special resin is called "Phenol Epoxy".

Milo; I looked at that extremely long thread and it has everything I need in it, so thank you very much.

I will start the project over the next few weeks and probably post some pics on here.

Thanks again to all for your time and input.
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Old 10-16-2011, 08:56 AM
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Milo's thread is a good one..Now if you are making a tank to a custom shape like say for a chopped bike the plug can be made from soft pine boards cut to shape on a bandsaw and stacked up and guled together like a wedding cake..each layer is made so one edge is close to the final shape..then carve the shape to the final and gel coat coat it and you have the plug for the top sides of the tank. .. Make a similar type of plug to fit the bottom of the tank making provision for petcocks and such..

Take a mold off of each plug and then you are ready to make parts..mold the upper side and then leaving it in the mold take the lower piece and place it in the proper position and secure it with a few dabs of hot glue..then using glass tape and resin permanently secure the tank bottom to the top..

At the boat factory we glassed in metal valve stems in our molds so when we were ready to pull a part we just used compressed air to blow the part out of the mold as we had some laminations that were 30 feet long in some molds and no amount of prying and tugging would pull those but a shot of air seperated the parts easily..Just remember to put a dab of modleing clay in each valve stem so it does not fill with resin and plug up..

Kind of a rough synopsis of how we did it...

Sam
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Old 10-17-2011, 06:55 PM
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When I was in high school I made a custom tank for my motorycle. I used white bead foam and shaped it how I wanted. then I coated it with plaster of paris. Next I laid it up with polyester resin and cloth. After it cured I poured gasoline in it to dissovle the bead foam. Next I put a bunch of 1/4" nuts in it and shook it and shook it some more to get the plaster out. It worked great.

I believe that vinyl-ester resin is FAA approved for composite construction of aircraft fuel tanks.

If your intent is to have the carbon fiber show, be sure to clear it with a good UV inhibited clear such as SPI Universal clear.
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Old 10-18-2011, 03:44 AM
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Thanks so much for the input guys.
I have ordered-in supplies and will start the project in a couple of weeks.
Thanks to all for the pointers and encouragement.
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