v8kid
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| posted on 5/12/12 at 10:09 PM |
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Ah well!
Lots of opinions to say I'm wrong - one quite insulting really - but I've actually done it and it works.
Make of that what you will.
Cheers!
PS With a mid engined car and the gearbox at the rear the gearstick end of the linkage is bolted to the chassis and the gearbox end is on a gearbox
which wobbles about if its on rubbers - so solid mounting makes a big difference. Like I said I've done it and I learnt from someone else who
did it.
Now I see why some other forum members get so grumpy.
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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coyoteboy
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| posted on 6/12/12 at 11:41 AM |
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v8kid - I wouldn't have thought you'd have enough flex in rubber mounts to cause THAT much wobbling, surely you pick your mount stiffness
to suit?! I guess if you're going to use linkages instead of cables you will have that issue though!
Do you have images showing how you mounted it as a stressed member? I'm curious. What generally causes problems is twisting of the block and
heads can cause separation at the interfaces, but also slight misalignment at the bearings and piston bores, which means increased wear and warp over
extended periods.
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mcerd1
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| posted on 6/12/12 at 11:58 AM |
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quote:
Originally posted by v8kid
Lots of opinions to say I'm wrong - one quite insulting really - but I've actually done it and it works.
I don't think most of us are saying your wrong, just that it makes things a bit more complex and there is a chance that the engine won't
like it much....
as chillis said allot of older engines may well have the spare capacity in the block design - but its not like there are figures avalible for these
if you had fancy FE software and/or loads of cash to spend on analysing the design you'd get a better idea what the engine was capable of
but the only way to find out for sure is to try it and see what happens 
[Edited on 6/12/2012 by mcerd1]
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coyoteboy
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| posted on 6/12/12 at 01:01 PM |
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I had considered making the engine a stressed member in mine (Audi ABZ V8) due to the nice availability of large attachment points on the heads and
many attachment points on the block, plus extensive casting braces around the block. I decided against it as I think I can make a stiffer chassis
*around* it and I've very little to gain(lose) weightwise.
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v8kid
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| posted on 7/12/12 at 02:04 PM |
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Here is photo I've circled the mounts in red.
 
semi stressed engine
The bottom two bolt through the gearbox. The top two bolt on to the bellhousing bolts and there are another two that bolt the siderails on to the
block at the usual mounting points.
Argh! you can't see them try this
 
Description
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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jon200
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| posted on 7/12/12 at 04:08 PM |
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quote:
Originally posted by v8kid
Here is photo I've circled the mounts in red.
semi stressed engine
The bottom two bolt through the gearbox. The top two bolt on to the bellhousing bolts and there are another two that bolt the siderails on to the
block at the usual mounting points.
Argh! you can't see them try this
Description
Is that solid mounted then?
Anyone know how rubber is graded from soft to hard? With examples?
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Alan B
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| posted on 7/12/12 at 04:50 PM |
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quote:
Anyone know how rubber is graded from soft to hard? With examples?
Good reference here...
http://www.mcmaster.com/#about-firmness-ratings-for-rubber/=khnu9z
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coyoteboy
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| posted on 7/12/12 at 05:30 PM |
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That's not using the engine as a stressed member though, that's semi-stressed at best, but looks like it's just solid mounted (i.e.
you have framework around that contributes to sharing stresses, the box/engine are just helping out with triangulation and a bit of rigidity?). That
is MUCH easier on the block/box, unless I can't quite make something out in the picture (possible).
A properly stressed member looks like:
Where the whole transmission is used to replace the rear chassis structure, supporting all of the rear suspension pickup points etc.
[Edited on 7/12/12 by coyoteboy]
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v8kid
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| posted on 7/12/12 at 06:34 PM |
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quote:
Originally posted by coyoteboy
That's not using the engine as a stressed member though, that's semi-stressed at best, but looks like it's just solid mounted (i.e.
you have framework around that contributes to sharing stresses, the box/engine are just helping out with triangulation and a bit of rigidity?). That
is MUCH easier on the block/box, unless I can't quite make something out in the picture (possible).
A properly stressed member looks like:
Where the whole transmission is used to replace the rear chassis structure, supporting all of the rear suspension pickup points etc.
[Edited on 7/12/12 by coyoteboy]
Aye OK whatever 
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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coyoteboy
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| posted on 7/12/12 at 06:57 PM |
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Don't you whatever me If you're going to claim it's a stressed member and tell people they're wrong because you've
done it, you need to be right!
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jon200
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| posted on 7/12/12 at 07:15 PM |
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quote:
Originally posted by Alan B
quote:
Anyone know how rubber is graded from soft to hard? With examples?
Good reference here...
http://www.mcmaster.com/#about-firmness-ratings-for-rubber/=khnu9z
Thanks Alan, my problem now is that they don't state what shore grade on many ads. oo a or c
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