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Tr4a solid axle rear bump stops


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#1 nigethomas

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Posted 05 June 2018 - 10:08 AM

Hi everyone

Was wondering if anyone out there with 4a solid axle could advise me on something.i dont seem to have any bump stops on my 4a chassis the ones i presume screw in directly underneath shocker lever arm.i have the ones on the body fitted at the back but not on chassis.where is exact position these need to be fitted?there are no captives on the chassis as looks like its been plated over at some stage.i think due to these being missing its caused splits in the areas around where shocks mount.

Kind regards

Nige
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#2 Lebro

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Posted 05 June 2018 - 11:46 AM

This may not be true for 4's but on a '3 the bump stop rubbers are on the axle.

 

Bob.


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#3 nigethomas

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Posted 05 June 2018 - 12:12 PM

Hi ya bob hope your well.looking at moss book it looks like there is bump stop under lever arm damper which it says is for chassis.mine has never had these so just not sure of correct position of them.

Nige
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#4 stuart

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Posted 05 June 2018 - 12:26 PM

Here you go, picture from mine.

Stuart.

Attached File  Copy of Rear axle 006.jpg   89.95KB   1 downloads


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#5 nigethomas

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Posted 05 June 2018 - 01:53 PM

Nice one stuart 🖒

Nige
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#6 Motorsport Mickey

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Posted 05 June 2018 - 02:28 PM

Stuart, does the additional Spring leaf clamps stiffen up the rate at all ?

Mick Richards
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#7 stuart

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Posted 05 June 2018 - 02:55 PM

Stuart, does the additional Spring leaf clamps stiffen up the rate at all ?

Mick Richards

Oh yes, well spotted! I started with four of them per side as there is only one flavour of spring for those cars but eventually settled on the current two per spring which works really well.Picture below of intermediate setup with 3 clamps 9" and wires, now gone to 2 per side with 10" Alfins and Minilites.

Stuart.

Attached File  Rear axle 011.jpg   139.73KB   0 downloads


Edited by stuart, 05 June 2018 - 03:00 PM.

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#8 BrianC

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Posted 05 June 2018 - 06:08 PM

OK, I will show my ignorance as I've never heard of them before: 

How do the leaf clamps stiffen the rate?

[Preferably in layman's terms!]


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Current TRs:
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1958 TR3A [1323DT] - Powder Blue (currently reduced to CKD form - not much left now)
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1965 TR4A [FGC307C] - Conifer
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#9 Hamish

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Posted 05 June 2018 - 07:13 PM

I think they provide greater resistance to sliding on one another.
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#10 Motorsport Mickey

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Posted 05 June 2018 - 11:35 PM

I think they provide greater resistance to sliding on one another.


+1 but they also reduce the length of the individual "beams" in the spring configuration hence increasing the mechanical advantage to bending. ie the unfettered Spring length is between the axle beam and the Spring attachment to the chassis at either end, clamping the leaves together in one or two places as Stuart has halves or Quarters the "lever length" of the Spring leaves and reduces it's bending power, it can't bend as much.

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#11 Hamish

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Posted 06 June 2018 - 07:16 AM

So an easy and reversible modification for those odd days of competition to stiffen up the rear.
Hhhmmmmm interesting .........
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#12 BrianC

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Posted 06 June 2018 - 07:29 AM

Thanks Hamish and Mick - even I can understand that.


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Brian Chidwick
TR Register Lea Valley Group (Founder member and currently Deputy Group Leader)


Current TRs:
1960 TR3A [704FTT] - Conifer

1958 TR3A [1323DT] - Powder Blue (currently reduced to CKD form - not much left now)
Previous TRs:
1965 TR4A IRS/Surrey [MEL393F] - Black (wife's former pride and joy)

1965 TR4A [FGC307C] - Conifer
Standard/Triumph owner since 1968
TR owner and TR Register member since 1972 (Lea Valley Group)
Member of
Sporting Bears Motor Club - Driving for Charity

"Life is too short to remain unnoticed" - Salvador Dali
"I'll let you be in my dreams if I can be in yours" - Bob Dylan
"Life is what happens while you're busy making other plans" - John Lennon

[http://www.facebook.com/brian.chidwick]


#13 stuart

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Posted 06 June 2018 - 10:01 AM

So an easy and reversible modification for those odd days of competition to stiffen up the rear.
Hhhmmmmm interesting .........

Just make sure you place them correctly as it is possible for them to foul the inner tyre edge and use high tensile bolts, It takes a bit of trial and error to get it how you want but thats the same with any "Tuning"

Stuart.


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#14 nigethomas

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Posted 06 June 2018 - 10:33 AM

Hi stuart

Ive had car jacked up today and there doesnt appear to be any mounting points on chassis for the bump stops to attach to.ive tried to upload pictures but keeps saying size to big so gave up with it.is there anyway you could find me dimensions of these brackets as looks like im going to have to make these up.its no wonder its been banging about over bumps.

Cheers

Nige
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#15 nigethomas

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Posted 06 June 2018 - 10:39 AM

Have just looked in moss book and the brackets are listed but no longer available.part numbers 140194 Lh and 140195 Rh

Nige
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#16 stuart

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Posted 06 June 2018 - 11:58 AM

Talk to Colin at CTM as they make new chassis so will be able to supply them http://www.ctmengineering.co.uk/

Stuart.


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#17 nigethomas

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Posted 06 June 2018 - 12:31 PM

Ok thanks stuart.

Nige
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#18 Lebro

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Posted 06 June 2018 - 01:30 PM

Or the TR shop may have some 2nd hand ones

 

Bob.


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#19 stuart

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Posted 06 June 2018 - 02:15 PM

Or the TR shop may have some 2nd hand ones

 

Bob.

Unlikely as they are part of the chassis and welded on. Lukas usually like to sell you a complete chassis.

Stuart.


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#20 nigethomas

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Posted 06 June 2018 - 03:20 PM

Sorted stuart all ordered thanks again 👍

Nige
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