Author Topic: Driving 6.9 with suspension in "H" position?  (Read 193 times)

raueda1

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Driving 6.9 with suspension in "H" position?
« on: 04 March 2020, 10:27 AM »
Thought I'd start a new thread rather than hijacking the accumulator convo.

Where I live there are drain gutters on the sides of the roads.  They can be quite deep and regularly cause motorists to smash off air dams etc. Driven across sideways, such as out of my driveway, they can cause fender rub when the wheels aren't straight forward because the car is cockeyed across the gutter with one axle is extended while another is compressed.  As a result I often do local around-town driving in the H position.  I also end up raising/lowering the car at least twice every time I drive it. 

This raises the question of whether such frequent height changes contribute to premature wear of something or other.  Similarly, the suspension geometry is different in the H position.  Anybody have an views on this?  Cheers,
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

adamb

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Re: Driving 6.9 with suspension in "H" position?
« Reply #1 on: 04 March 2020, 02:31 PM »
Your car has been really well built. As long as you drive under 25 mph with suspension position in H I don't believe there will be any long term impact on the car's performance long term. Enjoy the freedom of having a dynamic suspension!

daantjie

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Re: Driving 6.9 with suspension in "H" position?
« Reply #2 on: 04 March 2020, 05:39 PM »
In the H setting you will feel almost no bounce in the suspension once fully "pumped up", thus there is no damping effect as you would get in the N setting.  I would be a bit cautious driving too long or spirited in the H setting as to my mind there would be more stress on all the suspension components, however not 100% sure.  I think the H setting is for occasional short term use only to clear/traverse obstacles.
« Last Edit: 05 March 2020, 07:56 AM by daantjie »
Daniel
1977 450 SEL 6.9 - Astralsilber

TJ 450

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Re: Driving 6.9 with suspension in "H" position?
« Reply #3 on: 04 March 2020, 09:40 PM »
I would say using the high setting frequently is a good thing, but yes as per the manual I would only use it at low speed and would lower it when not necessary. If you use it long term I would imagine tyre wear would be an issue.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

nathan

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Re: Driving 6.9 with suspension in "H" position?
« Reply #4 on: 05 March 2020, 05:43 AM »
agree with TJ, using it frequently is a good thing as it will keep the master valve from sticking and stop your cable gumming up!
6.9 79 #6436
6.9 79 #6290
6.9 79 #6181
6.9 78 #4764
6.9 77 #3096
6.9 76 #1741
6.9 76 #0902
6.9 75 #0018

raueda1

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Re: Driving 6.9 with suspension in "H" position?
« Reply #5 on: 05 March 2020, 07:51 AM »
Thanks gents, this is reassuring.- I think. ???  Just to clarify a bit, the car needs to be in H for me to get in/out of my driveway.  In nice weather I often use the car as a driver.  If it's just a short trip in town I'm inclined to leave it in H.  If longer then lower it (the issue of tire wear and go back to H to get in the driveway.  The point is, this adds up to a lot of in-out on the whole cable and valve assembly.  I'd imagine that most people would only use the  -  setting sparingly while I use it all the time.

The whole cable design on these cars seems to be quite stiff and it wasn't really clear to me if the whole thing is designed for such frequent use.  I do have to regularly readjust the cable in the clamp on the valve as the rubber sleeve tends to slip a bit. I need to find a way for the clamp to grab the cable more securely and will also ensure that the cable itself is lubed right. 
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

Randys01

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Re: Driving 6.9 with suspension in "H" position?
« Reply #6 on: 06 March 2020, 10:29 PM »
I agree the selection feel is less than  welcoming..bit crude in many ways. Citroen did it better. In any case stimulating the main valve periodically is not a bad thing. The elevated ride height really alters geometry and ride control. ...feels a bit weirdo and definitely for limited distance and speed application.
Bit like us walking on stilts.