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Torsion Bar Suspension

A forum for discussing issues relating to trailers and towing MacGregor sailboats.

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Torsion Bar Suspension

Postby Neo » Sun Dec 30, 2018 2:05 pm

Hi all,

Can anyone tell me what's inside the Torsion Bar Suspension units fitted to the Macgregor Aluminum Trailers?
Are the bars plain steel and a do they rust or break over time? ..... Or anything else that goes wrong with these units?

Thanks gents.
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Re: Torsion Bar Suspension

Postby RussMT » Sun Dec 30, 2018 3:46 pm

I've always thought they were rubber inside. But I could be wrong.


Image

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Re: Torsion Bar Suspension

Postby Neo » Sun Dec 30, 2018 3:57 pm

Thanks Russ that makes sense.
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Re: Torsion Bar Suspension

Postby RussMT » Sun Dec 30, 2018 5:09 pm

It still makes me wonder. Can that center square rod rust? Maybe the whole thing is full of grease or something to keep out corrosion.

Good question. Can it rust? As far as I can tell, nobody on this forum has had a problem.

I'd love to hear opinions from the smart guys.

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Re: Torsion Bar Suspension

Postby Jimmyt » Sun Dec 30, 2018 5:41 pm

The caps over the ends of the axle beam are rusting on mine. They may serve to hold the axle and torsion rubber in the axle beam. Don’t know about the condition of the beam itself, but I’m sure it will eventually rust out - and probably like the tongue beam - from the inside out. :|
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Re: Torsion Bar Suspension

Postby vizwhiz » Sun Dec 30, 2018 10:22 pm

Speaking of this - if i wanted to change my old axle and springs on my original steel S trailer to these, would it work?
:) :idea:
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Re: Torsion Bar Suspension

Postby Jimmyt » Sun Dec 30, 2018 11:11 pm

It's a bit of work but can be done.

https://m.youtube.com/watch?v=gDv4o83T4cg
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Re: Torsion Bar Suspension

Postby Neo » Mon Dec 31, 2018 12:13 am

A good idea turning the frame upside down but I'd personally rather have things welded and fabricate custom fit brackets than use all those nuts and bolts and off the shelf brackets like that.
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Re: Torsion Bar Suspension

Postby Tomfoolery » Mon Dec 31, 2018 12:17 pm

vizwhiz wrote:Speaking of this - if i wanted to change my old axle and springs on my original steel S trailer to these, would it work?
:) :idea:

I don't see why not. Should give a much softer ride, including when the trailer is empty, as they have a progressive spring rate - soft when lightly loaded, stiffening as more load is added. Unlike 'normal' leaf springs, which have a fixed rate. Normal meaning all the leaves are always in contact.

I would just be careful that the axle cross bar doesn't foul with the hull. The M trailer has a straight cross bar and I believe the hull actually rests on it, but they're available with drop centers, too. Some of them at least can also be indexed for ride height, making it easy to adjust to the existing fenders or tire/hull clearance.
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Re: Torsion Bar Suspension

Postby vizwhiz » Tue Jan 01, 2019 3:15 pm

Thanks Tomfoolery... the axle tube is rusted badly and i was going to replace it eventually anyway. So I’m figuring out my options... the spindles and bearings seem to be fine, it’s mostly just rust consuming my trailer...
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Re: Torsion Bar Suspension

Postby Tomfoolery » Tue Jan 01, 2019 3:55 pm

vizwhiz wrote:Thanks Tomfoolery... the axle tube is rusted badly and i was going to replace it eventually anyway. So I’m figuring out my options... the spindles and bearings seem to be fine, it’s mostly just rust consuming my trailer...

If the trailer is rusting away and you'd rather not put too much money into it, a replacement axle for your existing leaf springs is almost certainly cheaper. Just a tube with spindles and brake flanges. Just have to match the spring center distance, top/bottom spring location, wheel gauge, and axle drop. And of course, load rating and bearing type. Just an axle alone is surprisingly cheap.
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Re: Torsion Bar Suspension

Postby Neo » Tue Jan 01, 2019 5:13 pm

Yes Axles are cheap especially if you shop around and buy the tube/bar from a low cost metal supplier. I was shocked how cheap 45mm solid square section bar was. They can cut it to length and you can have new Axle Stubs welded on as a drop Axle. I can give you an axle diagram if you like?
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