James
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| posted on 3/7/12 at 10:50 AM |
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Clutch pedal size and strength
Posted this thread a few days ago about making a new clutch pedal based on the roadster plans:
http://www.locostbuilders.co.uk/viewthread.php?tid=171857
I couldn't find any plate the size I wanted (5mm) but a mate has given me a piece 6.8mm thick.
I mentioned this to a friend who's an engineer at Mclaren. He laughed at me saying what did I need something that big for? Couldn't I use
a bit of box section if I need something cheap? (I do need it cheap!  )
When I think about it, he would seem to be right- there's no maths to this but am I really likely to bend a bit of, say, 16gauge 25mm box
section (the stuff the chassis is made of?).
And it would certainly seem to be a neater solution than a solid chunk of girder!
How was the clutch so much lighter in the actual Sierra? 
Any thoughts?
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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James
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| posted on 3/7/12 at 10:58 AM |
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In fact, looking at the OBP cable clutch pedal
http://www.obpltd.com/obp-shop/race-car-pedal-boxes/kit-car-special/cable-clutch
it's much smaller (and most importantly, lighter!)
Right, box section it is then!
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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stevegough
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| posted on 3/7/12 at 11:07 AM |
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OY ! are you allowed to post a question, then answer it yourself?
Seems the height of selfishness knows no bounds!
BTW, you avatar pic wot you've had for years is just coming back into vogue.....
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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Chippy
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| posted on 3/7/12 at 01:34 PM |
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Hi James, your question re-Sierra clutch pedal, they are made from very thin steel that is pressed into a "U" shape, so very strog in
relation. I have the complete Sierra pedals, shortened, in my car. Cheers Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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Steve Hignett
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| posted on 3/7/12 at 01:48 PM |
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The "corrugated" type shape of the Sierra pedal gives it it's strength as mentioned above, but I'm sure you already knew
that.
But in my opinion, I would not rely on the OBP pedal box thinking that this is over-engineered, if I were you...
The clutch pedal doesn't have much force to contend with, but at the same time, it would be a pain in the bum if using 1mm thicker material than
you initially thought stopped you being stranded. (I'm obviously exagerating)...
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