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Modifications Required For Solid Sub Mounts


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#1 CBJ805T

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Posted 09 June 2022 - 11:29 AM

Hi, 

 

I'm replacing the toe board on my 1984 mini and once restored, I'm considering fitting solid subframe mounts. I'm aware that, to do this, I need to add some additional strengthening to the toe board subframe mounting area, however can't find anything definitive, as to what this reinforcement should look like. 

 

The Heritage panel I'm fitting already has a 'reinforcement' parch around this area - I'm assuming this isn't sufficient?

 

If not, I've got some questions :

 

how big does the reinforcement panel need to be?

what thickness - 0.9mm?

is is located on the toe board only, or should it bridge floor panel?

Do you add this on the inside or enginebay side of the panel?

 

thanks and sorry if this has been asked before - happy to be point to previous posts

 

Cheers

 

Chris 



#2 simonaoz

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Posted 09 June 2022 - 12:26 PM

This a good vid about modding the toe board

 

 


Edited by simonaoz, 09 June 2022 - 12:27 PM.


#3 sonscar

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Posted 09 June 2022 - 01:11 PM

When watching the video bear in mind this is a fully caged race car.I have a hazy recollection that in a frontal impact the engine and subframe would pivot around the top mounts pushing the floor upwards and moving the steering wheel away from your face.Of course we are not going to have an accident but it is something to consider

A plate 6inch square centered over the mount holes and bent under the floor flange plug and seamed to the bulkhead would probabli suffice,Steve...



#4 sonikk4

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Posted 11 June 2022 - 10:07 PM

Personally I would use 1.2mm steel sheet, seam and plug welded in place. Shouldn't need to bridge across both sides.

6” x 6” should suffice. Don’t seam weld all at once either, inch miss an inch etc and minimise any heat build up as much as possible.

#5 GraemeC

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Posted 13 June 2022 - 08:42 AM

Definitely bend the strengthening piece such that it overlaps from toe-board to floor and is welded to both.

 

Solid subframe mounts would be SO much better if they were designed to lap under the floor and have an additional bolt - you wouldn't need additional strengthening then.



#6 mini13

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Posted 13 June 2022 - 12:01 PM

yep like the original subframes did pre 76

 

Definitely bend the strengthening piece such that it overlaps from toe-board to floor and is welded to both.

 

Solid subframe mounts would be SO much better if they were designed to lap under the floor and have an additional bolt - you wouldn't need additional strengthening then.

 



#7 Ben_O

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Posted 13 June 2022 - 08:43 PM

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#8 CBJ805T

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Posted 22 June 2022 - 11:51 AM

Hi All, 

 

Sorry for the delay in replying - thanks for all the input!






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