Echidna
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| posted on 18/12/08 at 11:06 PM |
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Indy brake pedal ratio
Hi! Could anyone give me the brake pedal ratio of the stock MK Indy brake pedal? Any pictures will be appreciated too! Thanks!
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Mark G
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| posted on 18/12/08 at 11:22 PM |
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Don't know about the ratio but I've attacted a couple of photos for you
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mackei23b
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| posted on 19/12/08 at 08:14 AM |
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Here are some pics of mine
.jpg)
Cheers
Ian
[Edited on 19/12/08 by mackei23b]
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nick205
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| posted on 19/12/08 at 12:41 PM |
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You can set the ratio (to some extent) by drilling the clevis hole where you want it (within reason).
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02GF74
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| posted on 19/12/08 at 02:15 PM |
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quote:
Originally posted by chris mason
The pedal ratio is somewhere around 3:1 
you'd be better off trying for a different set up if possible, and try to get nearer to 5.5:1
Chris
yeah - that struck me too 3:1 is a bit low.
5:1 is what you should aim for; most of the the pedal boxes are lke this.
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Echidna
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| posted on 19/12/08 at 04:59 PM |
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I know that 3:1 is quite low! In my own setup for my Haynes Roadster i made it around 5.7:1.
Then, in the case of the MK Indy if you drill the clevis hole lower to increase the pedal ratio, the angle of the clevis will be greater, because the
MC is fitter quite high on the backplate.
In my case i fitted my MC as low as possible to achieve the lowest angle between clevis and MC axis possible.
If you drill the clevis hole lower on an MK pedal, i think that the greater angle between MC axis and clevis will give problems to the MC reliability.
What do you think?
[Edited on 19/12/08 by Echidna]
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Echidna
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| posted on 19/12/08 at 05:05 PM |
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To understand what i mean:
 
Rescued attachment Indy Brake Pedal fitted 2.JPG
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Echidna
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| posted on 24/12/08 at 05:43 PM |
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Anyone?
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Bluemoon
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| posted on 27/12/08 at 06:05 PM |
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Did something similar to you photo, but not as high an angle (low pivot point). Had to make my push rod conical at the end to stop binding with the
end of the cylinder (use an HT M8 bolt, ground end to around M6 size).. This is all before SVA and it's not been on the road..
I think making an angle plate to tip the master cylinder up a but might help (not done this).
U2U if you want more info.
Dan
[Edited on 27/12/08 by Bluemoon]
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Echidna
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| posted on 27/12/08 at 06:22 PM |
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I think i got an idea... 
 
Rescued attachment Indy Brake Pedal fitted 2.JPG
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For any question, just U2U or email me at
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Bluemoon
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| posted on 28/12/08 at 12:15 PM |
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I'd not recommend that, there is a lot of pressure on the rod in an emergency! Last thing you want is the rod bending at the new bend... Then no
brakes...
Your idea is sound apart from that.. If you engineer a sufficiently strong push rod design it would be o.k. but it would be simpler to move the master
cylinder down a bit, or angle it..
Dan
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RobH
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| posted on 30/12/08 at 10:38 AM |
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Hi All
This subject has been talked about a lot before.
I thought this link might be of interest
Linky
Rob
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