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Old 07-29-2018, 09:29 AM   #21
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Thanks.
So glad to see i am not the only one being confused....

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Old 07-29-2018, 12:51 PM   #22
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The spring is under compression when the pedal is all the way up. At the very start it compresses a bit more and yes, it adds a bit of resistance at this point, but after a little bit of travel it starts extending and reducing pedal pressure.
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Old 07-30-2018, 03:44 AM   #23
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The spring is under compression when the pedal is all the way up. At the very start it compresses a bit more and yes, it adds a bit of resistance at this point, but after a little bit of travel it starts extending and reducing pedal pressure.
Thanks for clarifying - I think I get it.
My understanding is sketched below - not exactly an engineering drawing but what the heck.
The compressed spring is applying a force to both sides of the pivot depending on the position of the pedal - hence the dual function - right?
Quite clever!

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Old 07-30-2018, 05:35 AM   #24
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Yes, that's exactly how it works.
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Old 07-30-2018, 12:25 PM   #25
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Isn't it gratifying when you understand how some piece of engineering works? Like you, I sometimes finding myself asking "how", then think, then sketch, then think some more. At some point there is usually an "ah-ha!" followed by a smugness as if I just figured out all of the mysteries of life.

Anyway, kudos for figuring it out, but perhaps even bigger kudos for asking "how"...that's becoming a lost art. It seems that more and more people care less and less about how or why something works, and when it breaks, they act like a child with a broken toy expecting someone to come and magically fix it. I find it all pretty sad, I just hope this isn't an evolutionary shift.
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Old 07-31-2018, 08:49 AM   #26
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Isn't it gratifying when you understand how some piece of engineering works? Like you, I sometimes finding myself asking "how", then think, then sketch, then think some more. At some point there is usually an "ah-ha!" followed by a smugness as if I just figured out all of the mysteries of life.

Anyway, kudos for figuring it out, but perhaps even bigger kudos for asking "how"...that's becoming a lost art. It seems that more and more people care less and less about how or why something works, and when it breaks, they act like a child with a broken toy expecting someone to come and magically fix it. I find it all pretty sad, I just hope this isn't an evolutionary shift.
Thanks for your kind comment!
I was so frustrated over this I lost a couple of nights’ sleep......
But with a bit of help from the forum and then some sketching and thinking, the penny dropped.
Gotta keep that brain working!
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Old 08-05-2018, 04:38 AM   #27
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Spring update

On racetrack yesterday - two more spring sections fell down into footwell after a couple of hefty rounds....
Indicating that there must be even more up there - the ending of the spring to the left is still missing. I am not worried about it anymore - but just for interest.
How long is this spring in uncompressed state - anyone knows?

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Old 08-05-2018, 05:06 AM   #28
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Old 08-05-2018, 06:36 AM   #29
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Thanks - my three parts are adding up to just over 90 mm.
So basically only missing a couple of mm that is probably still stuck in there.

Interesting to see the end colour of yours is red - mine is blue - sigifies what I wonder?
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Old 08-05-2018, 06:56 AM   #30
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By memory there’s a few different spring rates depending on model/market and would answer why there is varying opinions on the spring aided clutch feel. I can say that the spring I had absolutely killed the feel of the clutch biting and resulted in me stalling on more than one occasion.
The McMaster Carr spring I have now offers no assistance but is enough to insure the pedal returns to the switch and prevents side to side play that is bothersome with the assembly removed.
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Old 08-05-2018, 07:39 AM   #31
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Side note: I have a number of extra McMaster Carr springs available for free pickup in MA. Not worth shipping.

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