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(Post Link) post #1 of 55 Old 23-11-13 Thread Starter
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Suspension arms made from steinless steel

After a good deal of time (and money) finally i am sharing with you one of the projects that I've finally finished.
MarInox® suspension arms are made for Alfa Romeo 147/156/GT/GTA standard and sport suspension.
Suspension arm assembly was tested and certified by University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture in Laboratory of Experimental Mechanics, Croatia.
MarInox® suspension arms with reinforced bushes are made of extremely high quality rust free Inox® steinless steel.
All parts are manufactured and assembled by highly qualified and skilled labor certified by third party.
Rear suspension arms are made of seamless profile, whilst front suspension arms are made without it.

Later I will put more material about the test .
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It looks great.....great update for a trackday car.......
However you must consider that if side impact occurs, entire alloy subframe will be damaged.....
Had serious sideways hit on sidewalk recently, both arms damaged, but that's all......
Anyway it looks great, and there will be improved stability on the rear.
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Looks good. What's the weight difference?
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Are those bushes bonded rubber or something else?
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looks great. subtle mod but will always look ace
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Hmmm

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Are those bushes bonded rubber or something else?
This is a question I'd like to see answered.
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This is a question I'd like to see answered.
They look like "off the shelf" bonded bush's. you can buy them with different stiffness rattings...
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My experience with these rear arms is that there is many ways to do stiffen of make-it-looks-better arms....but IF you need to push a bush into the arm, no matter PU or aftermarket rubber bushes, bigger washers must be used to prevent the arm to slip away when load occurs.....when i put a PU on mines i even put a weld on it to prevent failure.....and it survive 2 years trackdays with slick tyres.....now i used same arms on my everyday car......
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What benefits do they offer ? Are they lighter, or is it just rust resistance ? I cant see them being any stronger as theres less metal and inox isnt generally any stronger than steel AFAIK ?
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1) It really stiffens the rear end, but would not know does the alloy sub frame brake. Someone wants to test it?

2) The weight difference is approximately 15 percent lighter than the original.
I'll check the exact difference in weights.

3) Yes the rubber is bonded, a pair has a stainless steel cylinder in the middle of the rubber. It is made of high quality Dunlop rubber and vulcanizing a special technique to adhere to stainless steel

4) Yes, it will outlive the car itself

5) They are machine made specifically for this use.

6) This is for the original arms. Doesn't apply for my suspension arms

7) The rear end is more stiffer(doesn't knock), the car handles better, life span is 3x longer than the original(bushes), it will never rust(stainless steel). The originals are not made from steel, but from vulgaris Iron. That's the whole point, if you get a chance try to bend the old Iron suspension arm, you will probably succeed. You absolutely can't bend my suspension arm with your legs and arms (if you bench press 300 pounds, then maybe )
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Suspension arm assembly was tested and certified by University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture in Laboratory of Experimental Mechanics, Croatia.
A special camera that is used to record material stress.
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Ok, youve convinced me, its the weight saving I really like.

Any plans for lower wishbones and/or front uprights ? !
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Very nice, I like the project allot.
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This is definitely a way forward in upgrading.
 
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I've posted most of the information and pictures found here to the dutch and belgian 156 forum aswell.

Got any contact information in case anybody wants to know more or buy?
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Who said it's for sale? Is it, Davormar?
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they are, found the website..
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Quote:
Originally Posted by yan.ko View Post
Who said it's for sale? Is it, Davormar?
MarInox® Suspension arms

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Aah, okay then
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(Post Link) post #20 of 55 Old 17-12-13 Thread Starter
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Quote:
Originally Posted by Cuore_Sportivo_155 View Post
I've posted most of the information and pictures found here to the dutch and belgian 156 forum aswell.

Got any contact information in case anybody wants to know more or buy?

Thank you for sharing information
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This report presents the results of the mechanical properties of the arms. All three types of arms are subjected to static tensile tests. Each experiment was repeated on three samples that means nine experiments are conducted. After the results confirmed the higher stiffness of newly constructed arm.

Suspension arm with the additional material is further subjected to dynamic testing. Parameters and a description of tests are given to each individual test.

Static test results show that the arm, Marinox - with additional material shows superior properties in terms of breaking force and in terms of stiffness relative to the construction of a new AR - without additional materials also in relation to the original AR arm.

Dynamic testing was conducted only on the suspension arm Marinox - with additional material, which showed the best mechanical properties in static tests. The arm withstood 5.000000 cycles after which the test is stopped. After test there is no visible damage on the Marinox arm.
Alfa Rome Test 1.avi - YouTube
Alfa Romeo Test 4 Strain overlay camera right1.avi - YouTube
Alfa Romeo Test 3 Source deformed camera right.avi - YouTube
Alfa Romeo Test 2.avi - YouTube
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What about doing some lower wishbones ?
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why no compression tests ?
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Hello davormar. The arms look great. What gauge and diameter of tubing are they made from? I was wondering how far you could go with making them lighter without compromising strength. It's the weld that fails anyway on the tests and in use that's always going to be the week point.

I always think it's a bit strange when people are worrying about this type of upgrade being too strong in the event of a side impact and twisting the chassis etc. I'm pretty sure that every insurance company out there would write off any car involved in a side impact of that nature regardless of what extra damage the arms may or may not cause. If you get hit there that hard it's gonna hurt and gonna cost
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in a side impact (wheel hitting kerb) these arms would be put under compression, not tension....
Under hard cornering, the outside arms would also be under compression, not tension...

Why were the arms tested under tension, as I cant think of any situation where these arms would be under a high tension load.
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