Advice pls, crutch strap fouling seat rail

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CtrMint
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I'm not sure how many spacers I have on the seat, between the seat and the rail, I think 1.   I don't have any spacers between the floor and the rail. 

From the pics etc I believe the conflict is occurring at the back of the rail, I'm not sure a spacer can help.  I need to find a solution even if it's taking out the strap, having my knees up against the dash is awful.

 

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
garybee
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Does the protruding section of rail serve any function?  Can you just chop it off?

CtrMint
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I'm not sure, you might be able to cut the rail down, but I don't fancy it.  I suspect the two sections wouldn't run freely.

I'm wondering if it's possible to mount a bar across the two mounting points, then attach the strap to that.  Doing so should also the mounts to be move inboard suficiently to clear the rails.  Though I'm not about the engineering of that solution, obviously it would need to be safe.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
CtrMint
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I'm still trying to find the solution to this problem.  My next step is to pull the seat out again and see if I can account for Neil's comment stating he doesn't suffer the conflict on his install.

Before I do, I've checked the seat assembly diagram.   I notice there appears to be 3 possible holes in the seat diagram where the seat attaches to the rail.  Does anyone know if these are configurable?  i.e. you can use a choice of the 3 and essentially offset the seat forwards or backwards slightly?  

It would be amazing if that was the solution.  Other than that I'm struggling to account for the difference.

thanks, really appreciate some support with this,  my knees are up against the dash and the bottom of the wheel is rubbing on my legs.  it's ruining the drive.  But the crotch strap is a massive improvement so really want to solve the issue,

thanks

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
paul richards
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Not familiar with Tillet seat set up, but in the diagram it looks like seat is mounted to the 2 extreme end holes and therefore no alternative. I have leather seats and lowered floors and I did fix a bar across the 2 mounting points. From memory I think I used one "conventional" mount and one from the bar. I'll have a look and try and take a pic if you wish. BM me if you want a pic.

Paul Richards

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"It's only a car club"

CtrMint
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Paul, 

if you could take a pic that would be amazing.

I've taken the seat out and runner off.  I found I could rotate the inner runner, and use a different set of holes, this moved the seat further back and solved the problem on that side.  On the runner with the adjustment mechanism this wasn't possible.  I also found the diagram isn't accurate, you cant use the rear most hole as the front mount hole doesn't align with a bolt hole.  You need to come forward one at the rear.  I think this then causes the excessive movement to the back.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
BrettJ
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Hi Mark, what if you put the retaining triangle above the space. This should enable the rail to go under the retaining triangle.

CtrMint
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Hi Brett,

Thanks for your contribution.  From a safety perspective, I'm not so sure it's a good idea.  I'm assuming the documented installation is designed to spread the horizontal load between the mounting tab and floor.  Placing it above might negate that benefit, however I'm not a mechanical engineer so can't be sure.  I'd also need to excessively pad the mounting tab with washers and also a new spacer combination to fit that way as the tab has a raised lip on the sides. 

Thanks

Mark

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
CharlesElliott
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I'm certain that would actally be safer. The weak point is the thin aluminium floor, which can tear. With the bracket higher up more load is on the steel chassis tab.

BrettJ
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I agree with you Charles, but I looked in the Assembly guide and Mark has installed it as they show it in the guide.