Jimbob
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 posted on 9/5/08 at 05:20 PM |
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Word of warning regarding bulkhead flex
Speaking from scary experience!
I have an early MK chassis with a feeble bulkhead(search showed up they are thicker now) and it was flexing so badly under heavy braking that it
caused the solid copper pipe to fracture at the flared end. Guess its like when you keep bending a paperclip and snap. Anyway this happened to me
coming off the M62 and luckily i managed to avoid the worst!
Healthy bracing now installed and undies washed!
Thought it was worth a mention anyway to save the worst for others regardless of what they are building
Cheers James
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graememk
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| posted on 9/5/08 at 05:51 PM |
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i have a 3mm ali plate either side of mine
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Howlor
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| posted on 9/5/08 at 05:59 PM |
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James,
Useful piece of information for people.
Was it on the westbound Hudds junction that has the really sharp bend on the short slip road?! That would have made you shed a nugget as it has caught
me out before.
Steve
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britishtrident
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| posted on 9/5/08 at 06:56 PM |
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You missed the other key aspect of the failure.
Copper pipe work & age hardens and becomes brittle, next stage is "season" cracking or fatigue failure.
For this reason no volume manufacturer has used copper brake or fuel pipe anywhere on vehicle since the 1930s.
Brake and fuel pipes should always be either steel "Bundy" or "Kunifer".
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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welderman
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| posted on 9/5/08 at 10:15 PM |
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i noticed that my bulkhead flexes today whist bleeding the brakes, not looking good, think i need to put a plate or two there aswell.
Thank's, Joe 
I don't stalk people
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=172301
Back on with the Fisher Fury R1
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skidude88
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| posted on 12/5/08 at 10:48 AM |
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My early MK also has paper thin bulkhead.
The flex, causes the brake reservoir to move forward and then be fouled by the steering column UJ. There's a steel angle strengthener below the
MC, but it's too low to help.
Also tried to stiffen up with ali plate, not great but better (don't have facilies to use steel and put hole in for pedal controls)
Difficult to put strengthener across as the pedals get in the way.
A friend put an adjustable steel rod up against the bulk head, under tension to stop it from flexing.
I've prevented fouling with a remote reservoir, but created myself more troubles.
Definitely a job to be prevented at build rather than after.
Early MK de-Dion CBR1000 FJ-FP.
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Jimbob
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| posted on 14/5/08 at 04:30 PM |
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sorry for late reply!
Steve it was westbound at brighouse so lesser of the evils!
britishtrident fair point and im currently investigating braided ptfe flexible hoses from a local specialist
James
[Edited on 14/5/08 by Jimbob]
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