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What kind of working limit do cv joints have.
Obviously as close to straight is preferable and as suspension moves the angles increase dramatically but how sharp an angle will they run at full time?
Has anybody raised or lowered an engine significantly 4 inches plus?
Thanks
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Look at fwd cars, at full lock they have quite a lot of angle with the outer CV joints.
It might increase wear but i think you can get away with quite alot.
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stealthstylz
Club Retro Rides Member
Posts: 14,834
Club RR Member Number: 174
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I've done ~6000 miles with the CV joints constantly at stupid angles in my Clio and not had any ill effects so far.
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I've done ~6000 miles with the CV joints constantly at stupid angles in my Clio and not had any ill effects so far. Is that due to lowering? |
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ChasR
RR Helper
motivation
Posts: 10,191
Club RR Member Number: 170
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Outer ones can take more than you think.
Inner ones not so much.
I've seen one Subaru EJ20 converted Camper with a botched CV installation which constantly shitting out CV joints ; He went from a Porsche 'box to a Subaru 'box, which basically ruined his angles. We have a reminder of that through WhatsApp, and the various CVs dotted around the unit. It's shat one out when I had to unfortunately move it once as well.
He did look into this, but he also didn't want to modify it too much, so he could go back to the Porsche 'box one day.
IIRC he runs around 14 degrees normally, at they now seem to live on for much longer (TLDR : he bought longer shafts, and changed his hubs, using the extra length of the shaft to reduce his angles). I think before, he was at 20, and it was a near monthly occurrence as to when his CV joints would die.
However, I think most CVs have a working angle tolerance set for them.
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stealthstylz
Club Retro Rides Member
Posts: 14,834
Club RR Member Number: 174
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Jul 10, 2022 11:50:22 GMT
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I've done ~6000 miles with the CV joints constantly at stupid angles in my Clio and not had any ill effects so far. Is that due to lowering? Yeah, not sure what the actual angle is but it's pretty silly, 5-6" drop on a FWD car. |
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Jul 10, 2022 16:48:00 GMT
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Thinking about it, the joint must be well within tolerance across the full range of suspension travel and steering lock.
As mentioned above the outers accommodate far more movement than the inners so with that in mind is there any reason I couldn't use outers at both ends of the shaft?.
The car is rear engined, rear wheel drive so the wheels won't need to steer, just drive and bounce.
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Jul 11, 2022 14:47:38 GMT
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Vw, BmW and GKN motorsport inner joints are almost exactly that, a variation on the classic 6 ball Rzeppa joints, but designed for plunge as well as some articulation
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16grit
Part of things
Posts: 213
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Jul 11, 2022 15:50:01 GMT
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Thinking about it, the joint must be well within tolerance across the full range of suspension travel and steering lock. As mentioned above the outers accommodate far more movement than the inners so with that in mind is there any reason I couldn't use outers at both ends of the shaft?. The car is rear engined, rear wheel drive so the wheels won't need to steer, just drive and bounce.
Outers **tend** to be the tulip style variants with a circlip inner and short, integral shaft into the hub.
Inners like the ford and vw -beetle/transporter - porsche911/930/944 versions have a circlip and bolt pattern on the other side. The VWs have a REALLY SMALL range, with the standard beetle ones starting at 12 degrees, the van ones at 17 and the porsche 930 at 25 degrees. Various aftemarket suppliers sell 'high angle' CV joints. Take a look at the autograss suppliers like Berrisfords for both shafts and CVs to see what is available in the common 100mm and 108mm options
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Last Edit: Jul 12, 2022 6:15:49 GMT by 16grit
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