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Split wishbones
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JIMBOB
Cruisin



Joined: 11 May 2021
Posts: 336
Location: Canberra

Posted: Fri Jul 23, 2020 9:45 am    Post subject: Split wishbones

here it is...




Looks like it would work. The semi-circle bits mount the wishbone to the diff with a single piot like a lower arm of a 4 bar setup. Will run two more arms near the diff centre hidden under the body.

Comments?

Cheers and beers
Jimbob
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Jimmy B
Cruisin



Joined: 01 Feb 2021
Posts: 349
Location: Tweed Valley, NSW, Australia

Posted: Fri Jul 23, 2020 10:41 am    Post subject:

Peter R wrote:
I do not know the arrangement shown on the HAMB, the suggestion below might be the same. I dared to post a response critical of a bad suspension arrangement often supported by its members and was attacked with such vitriol I have never been back.

I wouldn't listen to those wankers! Their the ones that drive around in deathtrap jalopies with no floor, no firewall & bottom of the body draggin on the road due to the 14in or so channel & think it's C L.

There is alot of good stuff that gets posted but then the dickheads start, so it's best to ignore them, they might go away.

Jimbob nice setup, I was about to post a question then I looked at your post again and now understand. the bottom rod pivot acts as the instant centre (?) due to the length, the top has to mount and line up with the bottom pivot (did that make sense ?)
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JIMBOB
Cruisin



Joined: 11 May 2021
Posts: 336
Location: Canberra

Posted: Fri Jul 23, 2020 10:54 am    Post subject: Split wishbones

Speakin of bad suspension geometry, and not havin a go at any one in person, have you seen the angle of the dangle of the shockies on the front of the latest ASR cover car? Surely that can't work too well?

Oh yeah, and until you've become known on the HAMB, just be carefull what you comment on. As Jimmy B said, heaps of good stuff on there but a bit wary of strangers, might be a banjo thing

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Jimbob
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devilrod
200rpm



Joined: 11 Jun 2021
Posts: 207
Location: Cranbourne North

Posted: Fri Jul 23, 2020 1:07 pm    Post subject:

Outback wrote:
I've always been told to never split wishbones to the chassis, and that has been the end of discussion, jus lately, in the last month or so, I've had it explained, I understand, I'm still sussing out the 4 bar arrangement, but that's another story!!


Outback please tell me you are not going to ruin that beautiful looking jalopy of yours by putting 4 bars on it. I would bet my balls on it that your jalopy rides and handles better than a boxed and 4 barred A model.
Lets face it if you want comfort and refinement you would'nt build a HOTROD
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PeterR
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Posted: Fri Jul 23, 2020 11:04 pm    Post subject: Re: Split wishbones

JIMBOB wrote:
here it is...
Looks like it would work. The semi-circle bits mount the wishbone to the diff with a single piot like a lower arm of a 4 bar setup. Will run two more arms near the diff centre hidden under the body.
Jimbob

That is the arrangement I was suggesting. The 'bones effectively become two bars of a three or four bar configuration.

From the picture I suspect the two short arms are pivoted at the top of the diff housing and spread out as they run forward, similar to an HQ-HG.

This makes a simple and structurally sound arrangement that does not require a panhard bar. There is however one issue that warrants attention. The bones are much longer than the lower arms that would normally be used in a production vehicle with such an arrangement. Similarly the upper arms are much shorter than used in a set of four bars.

This large difference in length of upper and lower arms can cause quite significant changes in the pinion angle over full suspension articulation and lead to odd angles in the UJs. You can reduce this effect by making the upper arms as long as space allows; even mounting the diff pivot for the top arms slightly behind the centreline of the tube will help.

Generally, setting all arms horizontal at normal ride height will further reduce the extremes of pinion angle. You can confirm this for your particular vehicle by making a scale model from cardboard and drawing pins then adjusting the position of the forward pivot points.

This is just a small matter compared to the horrors of regular split bones that you have avoided with this arrangement so do not let it put you off the idea.
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Outback
Just Idling



Joined: 06 Mar 2021
Posts: 193
Location: Nhulunbuy

Posted: Sat Jul 24, 2020 12:32 am    Post subject:

devilrod wrote:
Outback please tell me you are not going to ruin that beautiful looking jalopy of yours by putting 4 bars on it. I would bet my balls on it that your jalopy rides and handles better than a boxed and 4 barred A model.
Lets face it if you want comfort and refinement you would'nt build a HOTROD



Nah don't worry, certainly no 4 bars for my ole gal, I guess I meant sussin them out, in my head rather than puttin them on a car.
I actually found the ole crate quite comfortable and well, maybe not the refinement

we all need people to give us a reality check, just in case!!

Oh yeah, Thanx for the explanation Peter

OB
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PeterR
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Posted: Sat Jul 24, 2020 2:13 am    Post subject: Re: Split wishbones

Quote:
From the picture I suspect the two short arms are pivoted at the top of the diff housing and spread out as they run forward, similar to an HQ-HG.


Whoops, meant to type HQ-HZ
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Jimmy B
Cruisin



Joined: 01 Feb 2021
Posts: 349
Location: Tweed Valley, NSW, Australia

Posted: Sat Jul 24, 2020 10:27 am    Post subject:

Just a thought I had, wasn't this setup intend to be used with a closed driveshaft as its only pivot is at the gearbox and the angle of the pinion isn't relevent. But as you said Peter this setup can be used with an open driveline as well, if it's setup right.
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