joolsmi16
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| posted on 13/12/06 at 05:58 PM |
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master cylinders
Hi all, do master cylinders on a floor mounted pedal box need to sit in side the chassis rails?
Currently having a move around on the front of my chassis and found that one of the brake M/C now overhangs the bottom rail, so now sits between the
bottom rail and edge of the bottom cockpit rail.
Hope thats clear-ish
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kb58
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| posted on 13/12/06 at 06:08 PM |
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They need to be someplace that's really strong, inside or outside. There's a lot of force trying to rotate them when you're hard on
the brakes. It could easily be 1000lbs with the pedal leverage. Regardless where they are, put them near a tube if you can, or at least box it in
with 1/8" plate.
[Edited on 12/13/06 by kb58]
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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zetec7
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| posted on 13/12/06 at 06:19 PM |
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If it helps, I'm raising mine 1" using a piece of 1/8" plate. I've been advised that having something for your heel to rest
against on the floor is a very good idea to help against fatigue, so the 1/8" plate will be welded to the top of the horizontal tube at the
bottom of the firewall, and those on either side, and will come back a few inches, where it will be bent down to meet the floor (thus forming a heel
rest). Should make a very strong mount for the pedals. I'm going to weld captured nuts on the underside of the plate to bolt the pedals down.
Hope this description isn't too confusing...
http://www.freewebs.com/zetec7/
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joolsmi16
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| posted on 13/12/06 at 07:04 PM |
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master cylinder
Hi chaps I mean the position of the master cylinder the engine side of the bulk head.
The M/Cs are secured to a metal floor mount box just concerned if there is a rule under SVA that the M/C must be enclosed within the chassis
rails?Image deleted by owner
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kb58
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| posted on 13/12/06 at 07:29 PM |
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In my opinion, that's too flimsy. The panel those mount to should be 1/8", gusseted to the main tube below. Better yet would be adding a
second parallel tube above the master's, and have the plate run between them.
Remember that whatever flex you get on that mount, will get amplified by your pedal ratio. In other words. if the cylinder bends the panel 1/8",
you are introducing 1/8 * 6 (or so) = 3/4" mushy pedal feel.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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oliwb
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| posted on 13/12/06 at 08:01 PM |
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Why've you taken out the outside bottom rail? I imagine that will weaken to the extent of endangering the chassis! Also depending on how your
bodywork fits on don't think MC's would pass like that as they'd be exposed so radius's etc would be a challenge.....I would
certainly put back that outside rail and maybe gusset a bit as others have mentioned....better to over-engineer than under - especially when it comes
to brakes! Oli.
If your not living life on the edge you're taking up too much room!
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joolsmi16
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| posted on 13/12/06 at 08:03 PM |
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I am not concerned about the strength of the firewall because thats not load bearing as the M/C are mounted to a steel pedal box inside the
footwell.
I am curious to see if Mr SVA has any issues with the M/C being outside the confinement of the chassis rails, with the two rails highlighted in white
removed??
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joolsmi16
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| posted on 13/12/06 at 08:11 PM |
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Sorry I should of said that its not on a locost build I have'nt got any pics of my build to hand.
Mines a mid engine build "full bodied"
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