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Author has anyone snapped the inner c.v joint because the cars too low
ryepye5
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Registered: 8th Aug 11
Location: exeter
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21st Oct 11 at 11:48   View User's Profile U2U Member Reply With Quote
Hi guys/girls i was wondering if anyone has snapped c.v joints because your cars too low? Iv gone through 3 so far? Anyone know how to fix it other than raising the car? Cheers
Jake
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Registered: 24th Jan 05
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21st Oct 11 at 11:50   View User's Profile U2U Member Reply With Quote
mine car was lower than most and never had problems.
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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21st Oct 11 at 11:51   View Garage View User's Profile U2U Member Reply With Quote
based on ford spec, which i imagine is similar to most other manufacturers, the inner cv should be at no greater angle then 18 degrees and the outer no greater then 45
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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21st Oct 11 at 11:56   View User's Profile U2U Member Reply With Quote
A lot will also depend on the loads through the joints.... and if they are greased etc.

A c20let B would more likely snap joints when compared to a 1.0 12v B - at the same angles. In my opinion.
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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21st Oct 11 at 11:58   View User's Profile U2U Member Reply With Quote
what size of wheels are you using?
ryepye5
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Registered: 8th Aug 11
Location: exeter
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21st Oct 11 at 13:39   View User's Profile U2U Member Reply With Quote
im using 15 inch tigra alloys with 195/45/ tyres.....my coilies are all the way down and i cut my bump stops a little bit to allow the car to sit lower.
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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21st Oct 11 at 13:55   View Garage View User's Profile U2U Member Reply With Quote
foolish
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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21st Oct 11 at 14:27   View User's Profile U2U Member Reply With Quote
here is a basic test for you

Jack the car up, slide the bump stops down.
Pop a couple of cable ties round the piston rods (the thin shiney one) on top of the bump stop. 1 per strut - or just 1 on 1 strut where you snap CVs all the time
Lower the car gently.

Do a routine drive round the block then jack it up again and see where the cable tie is.

Do you have any suspension travel?

[Edited on 21-10-2011 by AK]
thegsi
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Registered: 3rd Feb 07
Location: Kidderminster Drives: Evo (you can't afford one)
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21st Oct 11 at 14:34   View User's Profile U2U Member Reply With Quote
Try being 70-80mm down with a big heavy LET and F28 lump in the front and then try and put 250lbft+ through the joints, then you'll realise CV problems
AlexW
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Registered: 25th Oct 08
Location: Essex
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21st Oct 11 at 15:59   View User's Profile U2U Member Reply With Quote
Power will kill them rather than how low the car is IMO.

If the shaft has no movement lengthwise then its more likely to kill the CV's IMO
Steve
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Registered: 30th Mar 02
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21st Oct 11 at 16:40   View Garage View User's Profile U2U Member Reply With Quote
of course a greater angle will kill them, the spider bearing is put under more pressure on each rotation the greater the angle, also can even lock up if too much angle is exerted
kav
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Registered: 5th Jul 09
Location: Trawden, Lancashire
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21st Oct 11 at 17:42   View User's Profile U2U Member Reply With Quote
i had my c lowered at 60 mm and went through 3 cv joints in just over a year

[Edited on 21-10-2011 by kav]
AlexW
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Registered: 25th Oct 08
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21st Oct 11 at 17:46   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Steve
of course a greater angle will kill them, the spider bearing is put under more pressure on each rotation the greater the angle, also can even lock up if too much angle is exerted


The angle is less when lowered, Its normally in the opposite direction obviously but closer to straight.
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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21st Oct 11 at 18:32   View User's Profile U2U Member Reply With Quote
i would have thought the angle would increase

Outer high, inner low
thegsi
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Location: Kidderminster Drives: Evo (you can't afford one)
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22nd Oct 11 at 07:53   View User's Profile U2U Member Reply With Quote
When you lower a car, the inner CV will flex upward so the shaft exits at a greater angle. Then it'll enter the outer CV at a lower angle so both joints are under adverse stress over their standard set up. This mixed with added torque = Death.
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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22nd Oct 11 at 08:01   View Garage View User's Profile U2U Member Reply With Quote
Yeah angles increase

 
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