Two post hoist vs S2 jacking points

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Two post hoist vs S2 jacking points

Postby M100Brisbane » Wed 25.05.2022, 02:19

I am close to committing to buying a two post hoist

https://happ.com.au/hoist_and_lift/happ ... djustable/

this is my preferred option as I am limited by the height of my shed roof.

Can anyone advise on how a hoist like this adapts to the S2 jacking points (or absence thereof). Because the rear jacking point was deleted on the S2, I would think you have to lift under the rear wishbone inner mounts. I'm not sure the hoist arms will reach this far.

Thanks for any advice, I don't want to buy this and find it won't lift the car.
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Re: Two post hoist vs S2 jacking points

Postby Saltire » Wed 25.05.2022, 10:18

I’ve lifted my S2 on a two post lift with the lifting arms under the front and “rear” jacking points. It was there for quite a while as I was refurbishing the suspension, and came to no harm. IIRC, I used a couple of stout pieces of timber to spread the load on the rear arms a bit.

Given the configuration of the car, I calculated that the majority of the weight was passing through the front jacking points, and that the rear arms were mainly providing stability. I was quite keen to avoid a situation like this:

68766682-1159-4B38-B663-879A5D22BB53.jpeg
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Re: Two post hoist vs S2 jacking points

Postby dapinky » Wed 25.05.2022, 11:51

I have no personal experience on the jacking points suitability for an S2, but (as Jonanthan says) it can be done!

I considered a similar lift when I built the garage (roof not high enough to get a 4-post lift), but decided that it would be a PITA to have a 'fixed' position where I could work on a car (I have far to many projects on the go at any one time!)...

.... I then decided on a mid-height 'movable' scissor lift, but that doesn't give complete underside access due to the 2 "ramps" and connecting bars - but was workable for my needs.....

.... in the meantime, I still use a good trolley jack (high lift) and substantial axle stands - one day I'll get too old for that, and will look again at the options.
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Re: Two post hoist vs S2 jacking points

Postby M100Brisbane » Thu 26.05.2022, 00:42

I've done a bit more thinking on this - I'm inclined to think that Saltire is probably right. You could use the rear jacking point cut outs, with care.

Couple of points

Diagrams in the workshop manual don't indicate that the sill jacking points braced to the chassis - it must just rely on some solid layups to provide the strength. And of course the little steel piece that the jack fits into (front only on the S2, as we all know)

My old school S2 Europa jacking points are precisely nothing - just jack it under the rear of the front wheel arch and the front of the rear wheel arch. Use a piece of timber to spread the load. I know there's a lot less weight in a Europa, but the fibreglass layup is way lighter than in a M100. So, its probably not unreasonable to think that the fibreglass only M100 rear jacking point cut out is ok to use with some sort of load spreader.

I guess we all know that jacking an M100 using the front point soon has both front and rear wheels in the air. So, the rear jacking point isn't carrying much weight. Again, makes it probably OK to rely on the rear jacking point when the front is also supported.

I think that there is a risk that a reverse of the tail down Elise in the photo could occur in an M100.

Suggestions any one?
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Re: Two post hoist vs S2 jacking points

Postby Neil D. » Thu 26.05.2022, 05:54

Hi all,
For several reasons, I opted for a scissor lift. Originally a mobile unit that I have let into my garage floor.
https://www.flickr.com/photos/195781657 ... /lightbox/
Good for most jobs, except possibly exhaust removal
Neil
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Re: Two post hoist vs S2 jacking points

Postby Simon_P » Thu 26.05.2022, 10:05

M100Brisbane wrote:I think that there is a risk that a reverse of the tail down Elise in the photo could occur in an M100.
That was my thought also. The heavy bits are well forward of the jacking point.

It isn't clear if you are aware of the alternative jacking points se manual/wiki. At the front it isn't much inboard and forward. I use this one most of the time but it depends what I'm working on.

The rear cutouts are in proximity to the steel cills, B post and a steel cross brace. Parts are shown in the chassis/ bodywork sections.
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Re: Two post hoist vs S2 jacking points

Postby M100Brisbane » Sat 28.05.2022, 11:17

Thanks for you help folks!

Bit more thinking - I like to think alot before I spend a pile of money on something.

Can anyone say they have ever had an S2 on a 2 post hoist? I can see that it may be possible to extend the hoist's rear arms to reach specified inboard jacking points (wishbone inner pivots). However, it may be that the rear tyre gets in the way.

As observed above, the rear sill jacking point on a SE seems to be reinforced by various other steel bits in the body work, thus making it strong enough. It seem likely that the same steel bits are in the S2, so the only change to the jacking point is the outside steel plate that locates the jack. Any one not agree with this?
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Re: Two post hoist vs S2 jacking points

Postby exeterjeep » Sat 28.05.2022, 13:36

You could try asking one of the Lotus specialists eg SWLC/SJS, as your not based in the UK they would not be likely to be expecting your car to come to them for any work. So no loss for them?
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