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Cam-Tech-Craig



Member Since: 03 Aug 2011
Location: Gloucestershire
Posts: 16263

England 2015 Range Rover SVAutobiography SDV8 Loire Blue
Any shock absorber experts on here please?

My rear shock absorber exploded/burst spilling hydraulic fluid everywhere! My question is this, my L405 has a rear shocker with an extra external reservoir whereas the equivalent sport L494 does not! Why is that? What does the extra capacity do?
The electrical plugs on the top are identical and if I put a spare L494 Sport shocker in the boot and plug in the electrical socket there is no fault to display on the dashboard!

Anyone cast any light on this situation please? 🫶

Post #662652 23rd Apr 2023 6:04pm
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Arch Stanton



Member Since: 26 Apr 2012
Location: chavshire
Posts: 446

England 2018 Range Rover Autobiography SDV8 Corris Grey

Is the extra capacity a heat management solution? The extra thermal mass of the added fluid can more fluid movement through the valves without too much heat build up? First time FFRR owner

Post #662656 23rd Apr 2023 6:55pm
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knwatkins



Member Since: 11 Sep 2020
Location: Poole, Dorset
Posts: 761

United Kingdom 2014 Range Rover Vogue SE SDV8 Corris Grey

It's nothing to do with heat.

The external accumulator is used to hold more fluid to support the large variance of wheel travel that the L405 has (ie. when it's in extended mode).

Hope this helps Thumbs Up Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

Post #662657 23rd Apr 2023 7:03pm
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Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
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@knwatkins:

Clearly a knowledgeable and correct answer, and so very logical after a moments’ thought, isn’t it?

The general helpfulness and knowledge available are what makes this forum a cut above, long may it continue. Bow down Bow down Bow down

@C-T-C:

I take it a “low-rider” conversion is NOT about to happen? Shocked Rolling with laughter Rolling with laughter Laughing â€śIf it ain’t broke, don’t fix it” -where’s the fun in that?

Post #662666 23rd Apr 2023 8:30pm
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GraemeS



Member Since: 06 Mar 2015
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Australia 2012 Range Rover Autobiography TDV8 Bournville

I doubt that more extension is the reason as the fluid moves between above and below the piston as the shock extends and retracts. If more extension is required then a longer shock will be required.

Shock absorber canisters, whether affixed to the shock body or connected by a hose are promoted as providing extra oil capacity to keep the oil cooler under harsh operating conditions.

PS. The open and closed lenghts of the L494 shock would need to match the L405 shock if considering fitting the L494 shock. The fixed and bypass valves could be different too.

Post #662667 23rd Apr 2023 8:41pm
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Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1378

United Kingdom 2017 Range Rover Vogue TDV6 Corris Grey

It’s actually for 3 reasons, I suppose:

Heat dissipation will be better, longer stroke needs greater displacement/oil volume, and greater volume results in lower operating pressure, resulting in the softer ride of the L405 vs the L494, so ride comfort in the L405 could be the primary reason?

This explains it well: https://www.elevatesuspension.com/blogs/ne...-shocks-v1

Interesting discussion. â€śIf it ain’t broke, don’t fix it” -where’s the fun in that?

Post #662675 23rd Apr 2023 10:44pm
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Cam-Tech-Craig



Member Since: 03 Aug 2011
Location: Gloucestershire
Posts: 16263

England 2015 Range Rover SVAutobiography SDV8 Loire Blue

Thanks gang…
Don’t think I’ve ever given a shock absorber a second thought!
Both our 405’s have burst the same rear OS shock in a month! Bloody bad luck or??? 🤷‍♂️🤷‍♂️🤷‍♂️

Post #662685 24th Apr 2023 8:44am
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Bora20



Member Since: 03 Mar 2021
Location: Kamloops, BC
Posts: 234

Canada 2013 Range Rover 5.0 SC V8 Santorini Black
Re: Any shock absorber experts on here please?

Cam-Tech-Craig wrote:
My rear shock absorber exploded/burst spilling hydraulic fluid everywhere! My question is this, my L405 has a rear shocker with an extra external reservoir whereas the equivalent sport L494 does not! Why is that? What does the extra capacity do?
The electrical plugs on the top are identical and if I put a spare L494 Sport shocker in the boot and plug in the electrical socket there is no fault to display on the dashboard!

Anyone cast any light on this situation please? 🫶



@Craig: what shocks did you replace them with? My 2013 needs new shocks and of course it uses different ones than most due to being that unicorn crossover year. It appears my correct part numbers are LR034266 & LR034271. Dan. 🇨🇦 2013 L405 5.0 SCV8

Post #699122 30th Aug 2024 2:28pm
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