V8S engine mounting bracket tearing - is it just me?
Discussion
I seem to be tearing the top off one of the engine mounting brackets. This is the hefty metal bracket that bolts on to the block - not the rubber bush that connects it to the chassis. It's previously cracked and been welded up once and now cracked again a few mil further down the bracket.
It looks as if the top of the bracket needs reinforcing. Has anyone else run into this problem?
It looks as if the top of the bracket needs reinforcing. Has anyone else run into this problem?
It'll be that piddling little motor you've got in there Pete 
Which side is it? My engine is on a stand with the brackets on it, if you want me to post a pic let me know.
My mounts are fine - but then I have a standard motor :waitsforfallout:
They are pretty substantial there must be some serious force going under your bonnet......
Could you weld a vertical bit onto it - so if you cut it it would have a 'T' cross section?
Which side is it? My engine is on a stand with the brackets on it, if you want me to post a pic let me know.
My mounts are fine - but then I have a standard motor :waitsforfallout:
They are pretty substantial there must be some serious force going under your bonnet......
Could you weld a vertical bit onto it - so if you cut it it would have a 'T' cross section?
Edited by Barkychoc on Monday 22 September 16:46
trackcar said:
I only have 340lb.ft I'm sure yours must be gutsier than that, or soon will be MUCH gutsier if you're upping the boost ... Hot news from me is the 5 litre is coming out and up for sale .. I'm going boosted too! 4 litre turbo V8S coming next 
Do watch out for those engine mounting brackets!Mine is never going to produce any spectacular numbers because it doesn't rev well, but the effortless torque makes it great fun to drive. A selector failure recently meant I had to nurse it home in 4th, it pulls away from stationary in 4th gear without any fuss at all.
Presumably when the engine is supplying the torque it is twisting the engine away from the mount.
I'll have a look at my mounts tomorrow - though I think those top mounting bolts are quite small and the holes in the mount quite large - so could the bracket be bending and sliding slightly under the head of the bolt, eventually causing fatigue in the bracket?
I'm guessing slightly as I can't picture the bracket that side, I've had the drivers side one staring at me in the garage for nearly a year now......
Chris
I'll have a look at my mounts tomorrow - though I think those top mounting bolts are quite small and the holes in the mount quite large - so could the bracket be bending and sliding slightly under the head of the bolt, eventually causing fatigue in the bracket?
I'm guessing slightly as I can't picture the bracket that side, I've had the drivers side one staring at me in the garage for nearly a year now......
Chris
I hope not!
Well the manifold is pretty close to the chassis rail there, perhaps a couple of dozen strategically positioned cable ties would do the trick?Had been planning to treat myself to a pair of those until I looked at the price, and realized that the existing rubber mounts are holding together fine (so far, touch wood) and I could replace them several times for that cost. It's the mounting bracket that seems to be the weak link at the moment. I'll try to see if there is space to reinforce it without knackering access to the mounting bolts.
Pete, popped in the garage with the camera if this helps
I assume the weak point is here
This is side on - could you add metal in the green areas up each side to reinforce it?
My only reservation is that the top bolt isn't that big (and there's only one) - you might end up shifting the weak point to the bolt.
By the way ignore the bottom hole in the bracket - I drilled that before it went to the powder coaters as it was a water / oil trap.
Chris
I assume the weak point is here
This is side on - could you add metal in the green areas up each side to reinforce it?
My only reservation is that the top bolt isn't that big (and there's only one) - you might end up shifting the weak point to the bolt.
By the way ignore the bottom hole in the bracket - I drilled that before it went to the powder coaters as it was a water / oil trap.
Chris
Edited by Barkychoc on Tuesday 23 September 17:22
The problem is at the right hand end of the dotted green line in your picture.
I guess that the whole mounting bracket is twisting under load due to the lack of support at the top/right, and this is being resisted by the stiffness of the flange that the top bolt clamps to the block - resulting in a high local stress at the right hand end leading to eventual fatigue failure. If I can stiffen up the right hand end of that perhaps I can stop it flexing far enough to fatigue.
Edit: wish mine looked like that, mine is a blob of rust and peeling powdercoat.
I guess that the whole mounting bracket is twisting under load due to the lack of support at the top/right, and this is being resisted by the stiffness of the flange that the top bolt clamps to the block - resulting in a high local stress at the right hand end leading to eventual fatigue failure. If I can stiffen up the right hand end of that perhaps I can stop it flexing far enough to fatigue.
Edit: wish mine looked like that, mine is a blob of rust and peeling powdercoat.
Edited by GreenV8S on Tuesday 23 September 19:12
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