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Is It Just The Weather?
- RustyZ4
- Lifer
- Posts: 3622
- Joined: Fri Dec 14, 2007 7:23 pm
- Location: Maidstone, Kent
Is It Just The Weather?
I have noticed in the last couple of weeks, when I put my roof down, it seems to have developed quite a loud "thunk" to it, i was wondering if its just the hot weather making the hydraulic fluid thinner, therefore less resistance, or is it something else?
Z4 Mineral Grey, 28i MSport Auto, lots of goodies
Z4 E85 3.0, gone but now with son
Growing Old is Mandatory But Growing Up is Optional
Z4 E85 3.0, gone but now with son
Growing Old is Mandatory But Growing Up is Optional
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- Member
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Is It Just The Weather?
Which part of the process is the 'thunk' ?
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- buzyg
- Legend
- Posts: 26536
- Joined: Fri May 20, 2011 6:11 pm
- Location: Cornwall
Is It Just The Weather?
Do you mean it flops shut over the last few inches of the close operation? Mine has always done that a bit. I usually put my left hand up to ease the weight over those last couple off inches of travel.
- RustyZ4
- Lifer
- Posts: 3622
- Joined: Fri Dec 14, 2007 7:23 pm
- Location: Maidstone, Kent
Is It Just The Weather?
Sorry should have given more info, its the last bit when the roof is closing, when the rear window comes down and shuts
Z4 Mineral Grey, 28i MSport Auto, lots of goodies
Z4 E85 3.0, gone but now with son
Growing Old is Mandatory But Growing Up is Optional
Z4 E85 3.0, gone but now with son
Growing Old is Mandatory But Growing Up is Optional
- buzyg
- Legend
- Posts: 26536
- Joined: Fri May 20, 2011 6:11 pm
- Location: Cornwall
Is It Just The Weather?
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- Lifer
- Posts: 4045
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
Is It Just The Weather?
Mine as always done that, for the five years i have owned it. My roof is opened everyday, during summer months.
- jabber
- Lifer
- Posts: 3138
- Joined: Mon Jul 05, 2010 9:23 am
- Location: Hampshire
Is It Just The Weather?
Mine also does the same seems to be fairly normal
Z less again
14 E89 Z4 2.0 msport grey gone now
10 E89 Z4 3.0 Black auto now. Very sadly gone
Gone 04 E85 z4 3.0 Maldives blue smg
14 E89 Z4 2.0 msport grey gone now
10 E89 Z4 3.0 Black auto now. Very sadly gone
Gone 04 E85 z4 3.0 Maldives blue smg
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- Senior Member
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- Smartbear
- Lifer
- Posts: 13685
- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Is It Just The Weather?
Higher temps would make the hydraulic fluid less viscous, which could give a less “damped” operation.
Wait till the temperature drops & see if it becomes less slammy
Rob
Wait till the temperature drops & see if it becomes less slammy
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
- srhutch
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- Lifer
- Posts: 4045
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Is It Just The Weather?
If the cylinders are designed properly they would have a last moment slow down port built into the piston to cushion the end of travel.
I think at the point of closing there is simply too much weight at that leverage for the cylinder to cushion the blow.
https://www.cylinder.co.uk/technical/hy ... types.html
I think at the point of closing there is simply too much weight at that leverage for the cylinder to cushion the blow.
https://www.cylinder.co.uk/technical/hy ... types.html
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- Member
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- Location: Bexley, Kent
Is It Just The Weather?
Mine won't open currently (need to get it booked in when I get a chance) so complete lack of thunks and my neighbor thought it was a Coupe until I explained my roof mechanism is stuffed
Current - E89 Z4 SDrive 3.0i - last of the normally aspirated six cylinders
Gone - E85 Z4 2.2 SE
Gone - E85 Z4 2.2 SE
- RustyZ4
- Lifer
- Posts: 3622
- Joined: Fri Dec 14, 2007 7:23 pm
- Location: Maidstone, Kent
Is It Just The Weather?
Thanks all, everything works ok (that will be the kiss of death ) maybe I am just noticing it more these days
Z4 Mineral Grey, 28i MSport Auto, lots of goodies
Z4 E85 3.0, gone but now with son
Growing Old is Mandatory But Growing Up is Optional
Z4 E85 3.0, gone but now with son
Growing Old is Mandatory But Growing Up is Optional
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- Member
- Posts: 69
- Joined: Mon Sep 18, 2017 10:56 pm
Is It Just The Weather?
Mine gives a good thunk! Hadn't really noticed it before but now I'm hearing it a few times a day...
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EEK my MPG is currently:
EEK my MPG is currently: