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Old 10-12-2014, 11:57 AM   #1
dmcd OP
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Race rep tank, baffled or not?

Decided to have a go at making an aluminium fuel tank for my cb550 race rep project, so bought a sheet of alloy and a tig welder.









Was getting ready to join the inner and outer skins, but a friend suggested that it needs to be baffled. What do you think?
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Old 10-12-2014, 12:13 PM   #2
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Great job, my friend.

Unless you're aiming to run it down to near empty regularly, don't worry about baffling it.

The need for baffling arises because in places like the Isle of Man in long races, where you do some severe braking after using a lot of fuel, the dregs slosh up to the front of the tank away from the fuel outlet and so nothing flows down to the carbs.

We used to run baffled tanks on my old 7R and Manxes, because that was what they came with, but by the time I was running TR and TZ Yamahas in short races, I just kept the fuel level high rather than trying to save weight by having little in their tanks (even though these tanks came baffled standard, too).

My CB1100 superbike racers have unbaffled tanks.

[edit] I've just remembered: the race shop I co-owned 10 years ago built a couple of CB350 and one CB500 racer like yours, with very similar tanks. We didn't baffle them, and none of these ever had a fuel starvation issue, even at Phillip Island.
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PJay screwed with this post 10-12-2014 at 01:03 PM
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Old 10-12-2014, 12:42 PM   #3
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Wow! How cool is that? Very nice!
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Old 10-12-2014, 12:50 PM   #4
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Cheers Pjay, just wanted to have a second opinion before starting to close in the bottom.

SpikeC, Thankyou, but it wasn't that hard to make, it is my first attempt at sheet metal work, aluminium is very forgiving.
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Old 10-12-2014, 01:27 PM   #5
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What pjay said.

And well done mister a good job you have inspired me and no doubt others in your post here top job man.
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Old 10-12-2014, 01:56 PM   #6
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If you are after inspiration, this was the video that made me think I could "have a go"

http://youtu.be/rw5lYMmxSB0


I used a brush shaft and a paint tin to do my curves.
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Old 10-12-2014, 02:53 PM   #7
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Cool2

Thanks for the link apreciated.
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Old 10-12-2014, 09:20 PM   #8
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If it somehow became a problem later you could always add foam.

Where did you source the Monza cap from?
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Old 10-12-2014, 09:33 PM   #9
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If it somehow became a problem later you could always add foam.

Where did you source the Monza cap from?
Got the cap and filler neck off ebay.
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Old 10-14-2014, 10:01 AM   #10
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Quote:
Originally Posted by dmcd View Post
If you are after inspiration, this was the video that made me think I could "have a go"

http://youtu.be/rw5lYMmxSB0


I used a brush shaft and a paint tin to do my curves.
Thanks for the video !


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Old 10-14-2014, 02:13 PM   #11
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So one day you just went out and bought some metal and a welder and made that really nice looking tank? And you got it right the first try?!? Wow.

Good work.
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Old 10-15-2014, 10:05 AM   #12
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So one day you just went out and bought some metal and a welder and made that really nice looking tank? And you got it right the first try?!? Wow.

Good work.
Yip, can probably find the receipts if you need to see them, i spent a few months practising with the tig, wasting argon and rods, and learning settings from youtube videos, that was how I stumbled across the video of the guy making the tank. A sheet of aluminium was only 35 for a 1m x 2m sheet so I thought it was worth a shot. I also bought cheap metal rollers off ebay and am going to try rolling my own megaphones. There is even an app to work out the cones, which then gives you the measurements to cut from the sheet.

I guessed an alloy tank and megas would be 1,000, I got the ac/dc tig and gas for less than that, and I'll still have the tig when (if) it is finished.
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Old 10-15-2014, 10:49 AM   #13
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Originally Posted by dmcd View Post
Yip, can probably find the receipts if you need to see them, i spent a few months practising with the tig, wasting argon and rods, and learning settings from youtube videos, that was how I stumbled across the video of the guy making the tank. A sheet of aluminium was only 35 for a 1m x 2m sheet so I thought it was worth a shot. I also bought cheap metal rollers off ebay and am going to try rolling my own megaphones. There is even an app to work out the cones, which then gives you the measurements to cut from the sheet.

I guessed an alloy tank and megas would be 1,000, I got the ac/dc tig and gas for less than that, and I'll still have the tig when (if) it is finished.
Love it. You and I think alike!
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Old 10-18-2014, 01:54 PM   #14
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First mock up☺

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Old 10-19-2014, 01:19 PM   #15
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First mock up☺

Looking great!
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