RazMan
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 posted on 27/10/06 at 09:05 AM |
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Wobbly CV Boot - solution?
When my car was on the rollers yesterday I noticed that at high speeds (140+mph) the inner CV boots deformed so badly they started flapping about at
an alarming rate and one of them actually split, spewing CV grease everywhere!
The boots were brand new, high quality items and installed properly (I think) and the only possible cause that I can think of is the angle of the
driveshaft where it meets the bearing 'cup' - probably around 8 degrees.
I understand that the angle is not ideal but would this cause the boot to deform like this at speed? Is there a way of stopping it and preventing any
more problems in the future?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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NS Dev
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| posted on 27/10/06 at 10:18 AM |
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Yep, you need some of the aero type boots, only I don't know where you can get them from.
Give GKN at minworth a call, they'll sort you out.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 27/10/06 at 10:25 AM |
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GKN Driveline Service Ltd
Unit 5, Kingsbury Business Park Minworth
Sutton Coldfield
West Midlands B76 9DL
United Kingdom
Tel: +44 121 313 1661
Fax: +44 121 313 2074
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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RazMan
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| posted on 27/10/06 at 10:58 AM |
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Ta very much, I will call them right now 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Phil.J
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| posted on 27/10/06 at 11:05 AM |
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Or Merlin Motorsport or Demon Thieves.
Phil
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RazMan
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| posted on 27/10/06 at 11:14 AM |
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Just called them - apparently Mark is the one to speak to, but he is not in today so I will have to try next week 
Intrigued about these Aero boots - are they beefed up to withstand the greater centrifugal distortion?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Fred W B
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| posted on 27/10/06 at 11:16 AM |
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I read somewhere once that someone solved this problem just by putting zipties round the boots at the bottom of each "V". You would have
to do them up just tight enough, but it seems feasabile to me?
Regards
Fred W B
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RazMan
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| posted on 27/10/06 at 11:28 AM |
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Now THAT'S a novel idea and certainly worth looking into. When you think about it, it should stop the deformation at speed although maybe the
extra weight of the zip ties might compound the problem ..... who knows. 
Just spoke to Merlin and they do a 'fast CV boot' for the outer joints but nothing is available for the inner ones. My outers are
perfectly ok at speed (maybe I need to go faster then?) and it is just the inners that are flapping about.
I wonder if stretching or compressing them by moving the zip tie on the driveshaft either way, might have an effect?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Fred W B
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| posted on 27/10/06 at 11:32 AM |
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I would think that you could use the smallest ziptie that would be long enough, or 2 or more very small ones chained together, and the extra mass
would be very small compared to the mass of the boot and the grease inside it?
Also, any idea why replies to this thread are not showing on the index page, or is it just me?
Cheers
Fred W B
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NS Dev
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| posted on 27/10/06 at 11:58 AM |
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whole site seems a bit buggy today, not just you!
No idea on the boots, but I know that Ultima use GKN ones which are fine at 230+ mph, and I have found GKN very helpful in the past, and nowhere near
as expensive as you might think either.
They make bespoke props as well, you can just pop in there. Not as close as my normal prop place so I don't use them but had very good reports
from others!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Jon Ison
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| posted on 27/10/06 at 12:26 PM |
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Ive been beaten too the reply but can confirm cable ties cure the problem.
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RazMan
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| posted on 27/10/06 at 12:55 PM |
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That's great - I'll find some really wimpy cable ties and give it a go. It is certainly the Locost solution too! 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Peteff
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| posted on 27/10/06 at 03:26 PM |
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Could you fit one inside another? It would give a bit of insurance.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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RazMan
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| posted on 27/10/06 at 04:17 PM |
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Not really possible Pete - but thanks for the idea
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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tks
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| posted on 27/10/06 at 04:20 PM |
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use 2 ties at equal lenght
and it would be balances by the wobble..
problem at high speed is the greease mass i guess!!
maybe you need thicker grease to!
Tks
The above comments are always meant to be from the above persons perspective.
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