giz a clue

 

giz a clue

Link added now

 

I will be buying the full set in blue in the very near future.

I'd sooner have them over my 10 year old steel set that are corroded yet passing MOT's!!!

 

And whats wrong with stainless: :dunno:

Oh wait a minute, these people must be purists and want the original ones, that were made from recycled nissan sunnys and disintegrated on the slightest whiff of fresh air and or water.
:lol:

 

And whats wrong with stainless: :dunno:

I thought that main points in structure etc shouldnt be stainless as it is more likely to fracture?

Is this not the case for the mounts?

 

The problem is that people do not understand the word "Stainless" in Stainless Steel. It means just that in fact that is stains less than normal carbon steels.

Now I am not an engineer just a a machinist by trade but do know a little about stainless steels.

There are three basic types of stainless steel:-

Ferritic
Martensitic
Austenitic

One type is very rust resistant indeed but is not very suitable for high stress loadings. I researched this when building custom motor cycles and wanted to make stainless wheel axles and found a grade that would do very nicely but it does develop a this layer of discolouration like rust on the surface unless kept polished.

Some stainless steels are not weldable as they fracture over time next to the weld. This was demonstrated at the technical college the weld held the metal failed next to it.

Some stainless steel bolts for instance are rather like plastic in the way they twist and stretch and it's surprising just how little torque it takes to shear their heads off.. Some Indian made 8 mm cap heads only took 28 ft lbs to shear the heads off. Why do i know this well one job I had was to machine a tapered groove in the heads of them to make anti tamper fastenings for some fore court valves and they had to shear off at 16-18 ft lbs s we had calibrated torque wrench to check them with and an unaltered one sheared at about 28 ft lbs when tested.

Back to the sub frame mountings I would gather that these have been tested and found to be well able to handle the stresses imposed upon them for their intended purpose. the mild steel ones that are normally used bend quite easily in fact as I just straightened one out that was bent on this used sub frame I am stripping down.

 

The problem is that people do not understand the word "Stainless" in Stainless Steel. It means just that in fact that is stains less than normal carbon steels.

Now I am not an engineer just a a machinist by trade but do know a little about stainless steels.

There are three basic types of stainless steel:-

Ferritic
Martensitic
Austenitic

One type is very rust resistant indeed but is not very suitable for high stress loadings. I researched this when building custom motor cycles and wanted to make stainless wheel axles and found a grade that would do very nicely but it does develop a this layer of discolouration like rust on the surface unless kept polished.

Some stainless steels are not weldable as they fracture over time next to the weld. This was demonstrated at the technical college the weld held the metal failed next to it.

Some stainless steel bolts for instance are rather like plastic in the way they twist and stretch and it's surprising just how little torque it takes to shear their heads off.. Some Indian made 8 mm cap heads only took 28 ft lbs to shear the heads off. Why do i know this well one job I had was to machine a tapered groove in the heads of them to make anti tamper fastenings for some fore court valves and they had to shear off at 16-18 ft lbs s we had calibrated torque wrench to check them with and an unaltered one sheared at about 28 ft lbs when tested.

Back to the sub frame mountings I would gather that these have been tested and found to be well able to handle the stresses imposed upon them for their intended purpose. the mild steel ones that are normally used bend quite easily in fact as I just straightened one out that was bent on this used sub frame I am stripping down.

Thanks for the explanation :broon:
I understand that there are different grades of stainless and the more 'Stainless' it becomes the weaker it is.
So my thought is where is the mid ground?
Do you sacrifice strength up until a certain point? (Does it work like that?)
Wouldnt you be best going for the mild steel powdercoated?

Edit - Im not trying to rubbish the product - Im just asking questions to things I dont know much about.
Im sure that Darren + Jill have done their homework and wouldnt be selling items that would cause danger to the customer.

 

Have you discussed your concerns with Jill?

I believe she will be able to set your mind at ease. I found her to be most helpful when buying some bits and that subframe.

 

Looking some of the other applications of grade 304 stainless, I see that racing engine mounts are made from it. Also they make marine grade engine mounts from the same material. The stresses that marine engines put on their mountings is huge.

I doubt that Jill or Darren would've chosen anything that could be dangerous.

My verdict? I'm going to be getting a set myself.

 

I made my own and had them powder coated where I work.