29 replies to this topic

[Big Sam]

I've just fitted a new rollover jig from rolloverjigs.com and mine's the same. The pivot holes are far too high so looking to relocate them and turn the end frame upside down so as to lower the centre of gravity. Mine's the single post type not the A frame ends type.

 

Dont the instructions have the two bars you attach the bracing to the other way up?

 

I know its the old jig, but im pretty sure it applies to the new design too:

[whistler]

 

I've just fitted a new rollover jig from rolloverjigs.com and mine's the same. The pivot holes are far too high so looking to relocate them and turn the end frame upside down so as to lower the centre of gravity. Mine's the single post type not the A frame ends type.

 

Dont the instructions have the two bars you attach the bracing to the other way up?

 

I know its the old jig, but im pretty sure it applies to the new design too:

 

New single pole type has the pivot mount hole 48 inches from the ground.

[Tupers]

The distance between the pivot and the ground is irrelevant when it comes to balancing the shell. The only effect it will have is on the shells clearance to the ground when you rotate it.

I find 16-18” up from the floor pan is a good place to locate the pivot. It will change slightly depending on the state of the car and how many layer thick the floor is.

[skoughi]

Get the pivot point about the same level or slightly lower as the front crossmember and it'll be not far away from being balanced. 

[Big Sam]

 

 

I've just fitted a new rollover jig from rolloverjigs.com and mine's the same. The pivot holes are far too high so looking to relocate them and turn the end frame upside down so as to lower the centre of gravity. Mine's the single post type not the A frame ends type.

 

Dont the instructions have the two bars you attach the bracing to the other way up?

 

I know its the old jig, but im pretty sure it applies to the new design too:

New single pole type has the pivot mount hole 48 inches from the ground.

 

 

The new design from the site is the opposite way up from yours:

 

[miniracer115]

Ok. So I’ve raised the car by turning the end brackets around effectively moving the centre of rotation down to where it needed to be. It’s perfectly balanced now and turns effortlessly and will even stay in any position on its own. Than you guys for your help I couldn’t have done it without your inputs ? a little video attached.

[Honda-Mini]

The centre of mass of the car is too low here:

 

 

The horizontal frame needs to be moved further up the mounting holes (circled in red) to bring the centre of mass as close to the pivot axis (circled in blue). This will then make the body easier and a lot safer to turn! I suppose it is really trial and error to get it right, and it may need to be adjusted depending on how much material is removed and added!

if you look at the one from the website, it looks to the untrained eye (like mine) that uou have the front piece bolted on the wrong way up... the red ringed arms should be pointed upwards, thus lowering the turning centre in relation to the shell (effectively lifting the shell)

[mkw]

I have this same jig, bit of a pain to get the shell up but it really helps things!

 

Front mount bars need to point up and mine is on the third hole from the bottom, works a treat.

Edited by mkw, 02 June 2020 - 10:49 AM.

[Homersimpson]

I have this same jig, bit of a pain to get the shell up but it really helps things!

 

Front mount bars need to point up and mine is on the third hole from the bottom, works a treat.

They make a tool to load the jig, I use it on mine and its great even for a heavy car like the MK2 jag i'm doing now it makes it easy although it does take a bit of time to wind it up and down by hand.

 

https://www.rollover...balancing-tool/

[whistler]

Finally sorted out this single post jig after having to drill new pivot holes so as to enable me to flip the 'gate' and lower the COG. Eventually found out what all the extra spacers were for as well. Needed to buy a new locking bolt as they'd welded the one supplied to the post. Had to shorten the rear horizontal frame to enable me to shut the garage doors.

Attached Files

•  wed1.jpg   42.53K   3 downloads

Edited by whistler, 02 June 2020 - 04:50 PM.

[mkw]

 

I have this same jig, bit of a pain to get the shell up but it really helps things!

 

Front mount bars need to point up and mine is on the third hole from the bottom, works a treat.

They make a tool to load the jig, I use it on mine and its great even for a heavy car like the MK2 jag i'm doing now it makes it easy although it does take a bit of time to wind it up and down by hand.

 

https://www.rollover...balancing-tool/

 

How does this work then? I couldn't really figure it out from the website.

[Homersimpson]

 

 

I have this same jig, bit of a pain to get the shell up but it really helps things!

 

Front mount bars need to point up and mine is on the third hole from the bottom, works a treat.

They make a tool to load the jig, I use it on mine and its great even for a heavy car like the MK2 jag i'm doing now it makes it easy although it does take a bit of time to wind it up and down by hand.

 

https://www.rollover...balancing-tool/

 

How does this work then? I couldn't really figure it out from the website.

 

You bolt the jig bracket to the car and then this balancing tool hooks onto the bracket and the jig and then you tighten the thread which lifts the car unti it reaches the height you want, then you bolt it to the jig and repeat at the other end.

 

With a heavy car like the MK2 its really useful as its a pain to get them high enough up in the air without it, to be fair a mini is lot less of a problem especially if you have a few friends to help

[mkw]

Hmmm, i'll have to look into one of those.

[miniracer115]

I found that I had to lift the car quite high to get the correct COG. To do this safely I used my engine crane with straps around the end brackets to lift each end up and fix to the A-frame. Worked a treat. Wouldn’t have liked to be jacking the car up.
Not seen how the lifting screw jig works sounds like a good addition with the jig but could save a few £ lifting with a crane which worked well I found.

[Ben Rose]

I had to put my shell on to this exact Jig a few weeks ago.  I did it on my own which was a challenge to say the least.  The shell has to come up a long way to get the right centre of gravity.  For £90 the self loading\balancing tool would have been well worth it.  Its not only getting the shell on the jig its getting it off the jig too.

 

As Homersimpson said if you have a few friends to help then you shouldn't have a problem as a bare shell is relatively light.  In my case the lockdown was still well in place so I had no choice to do it on my own.