[Rusho]

Hi All,

I am the type of person who likes to know WHY something works, not just because someone tells me it does. I have alloy blocks for my body lift, I assumed that they would be better and would wear less than poly blocks. If someone could unbiasedly explain the pros and cons of the above mentioned it would be greatly appriciated. I would just like to gain a bit of knowledge on the subject as I have none.

Thanks

Rusho

[steak_knife]

Pro's work & con's steal !!!!!

[royce]

alloy touching steel corrodes

poly (to large a group) in the right material will be more than strong enough, though the wrong material will collapse pretty quick (like my spring spacers )

dont think there is a better material between the two if they are both used correctly

I want to hear of some real engineering proof of whats wrong with RHS blocks, now theres an old wives tale

[Rusho]

steknig wrote:

Pro's work & con's steal !!!!!

Anything more helpful steknig?

[Scrawny]

Rusho81 wrote:

steknig wrote:

Pro's work & con's steal !!!!!

Anything more helpful steknig?

That's asking a bit much!!

[steak_knife]

Rusho81 wrote:

steknig wrote:

Pro's work & con's steal !!!!!

Anything more helpful steknig?

No.


Rhs block's have been used to do so many thing's with great success for a great amount of year's, got me there. cause it's ugly? I'm ugly but i still work.

[Rusho]

ScrawnC wrote:

Rusho81 wrote:

steknig wrote:

Pro's work & con's steal !!!!!

Anything more helpful steknig?

That's asking a bit much!!

We'll give him the beneifit of the doubt

[steak_knife]

ScrawnC wrote:

Rusho81 wrote:

steknig wrote:

Pro's work & con's steal !!!!!

Anything more helpful steknig?

That's asking a bit much!!

1 word.. horn button!

[Scrawny]

steknig wrote:

ScrawnC wrote:

Rusho81 wrote:

steknig wrote:

Pro's work & con's steal !!!!!

Anything more helpful steknig?

That's asking a bit much!!

1 word.. horn button!

That's 2

See ya tomorrow with the tail light lens

[just_cruizin]

royce wrote:

I want to hear of some real engineering proof of whats wrong with RHS blocks, now theres an old wives tale

Take the bottom out of a cardboard box and press the sides together.

Back on topic.

Steel
Pro - strong
Con - Weight and rust

Alloy
Pro - strong, medium weight
Con - Galvanic corrosion varies with grade of alloy

Poly - Good Strength (not as high as alloy but sufficient for the application), light weight
Con - Different grades available thus quality of supply may be an issue.

People tend to generalise products together, lump all polymers together when there are vastly different grades of each material available that exhibit different properties. You may an uneducated comment in a different thread so it's good to see you've come back and asked an good question. People tend to bag products and when asked not openly state their evidence refuse to put their name to a statement on the open forum which in my view is quite gutless.

[steak_knife]

Sic mate, what time ya thinking? Gota see a dog about a man early, should be home round 10.

[Rusho]

just_cruizin wrote:

You may an uneducated comment in a different thread so it's good to see you've come back and asked an good question.

Cheers mate. I joined zookers to learn and wheel. Having fun with both

[Scrawny]

Rusho81 wrote:

just_cruizin wrote:

You may an uneducated comment in a different thread so it's good to see you've come back and asked an good question.

Cheers mate. I joined zookers to learn and wheel. Having fun with both

I was waiting for JC to turn up, I knew he'd have pearls of wisdom for us

Stekky, I'll be scooting past early arvo hopefully. I'll call before I come.

[steak_knife]

ScrawnC wrote:

Rusho81 wrote:

just_cruizin wrote:

You may an uneducated comment in a different thread so it's good to see you've come back and asked an good question.

Cheers mate. I joined zookers to learn and wheel. Having fun with both

I was waiting for JC to turn up, I knew he'd have pearls of wisdom for us

Stekky, I'll be scooting past early arvo hopefully. I'll call before I come.

Ok, may be at ODA1's doing a clutch, wana help??

[ODA1]

more help is always welcome , im at albany creek

[Trojan]

There are no pros and cons.

It's simple. Tell an engineer what you want to do and then do what the engineer tells you to do using the materials they tell you to use.

Poly is the material an engineer is most likely to knock back though and that's the simple reason as to not use it. It doesn't matter how good or strong the right grade is, if your engineer says "no poly" then it's never going to be good enough.

[royce]

just_cruizin wrote:

royce wrote:

I want to hear of some real engineering proof of whats wrong with RHS blocks, now theres an old wives tale

Take the bottom out of a cardboard box and press the sides together.

Yes but if you have the right thickness and number of boxes then its going to hold up even the most heavy duty milk crate in the strongest wind.

Not saying they are the best but I dont think they are as bad as people say, how do I work out what weight a piece of 50x3 350mpa shs 50mm long will collapse at? and then what load will it stand in shear? IE big prang where the chassis sits still and the body keeps going?

I only say it cause my sierra had an rhs lift for years before I got it and I never bothered to change it and none of the blocks moved an inch

[atari4x4]

i ran the calmini 3" body lift in my vitara for 3 years with no drama's apart from it looking mega booty fab & dodgy!

edit:

it was removed & replaced with a just crusing body lift & it looks soooooo much better !

[royce]

Trojan wrote:

There are no pros and cons.

It's simple. Tell an engineer what you want to do and then do what the engineer tells you to do using the materials they tell you to use.

Poly is the material an engineer is most likely to knock back though and that's the simple reason as to not use it. It doesn't matter how good or strong the right grade is, if your engineer says "no poly" then it's never going to be good enough.

I dont like to add useless posts to tech threads cause there is too much of it already but how can you reason this statement?

Poly is used in all sorts of applications where it is stressed in the same manner as body blocks but of a magnitude many many times higher,

why is the body insulated from the chassis by rubber? rubber isnt as strong so by your thinking its no good

and I will let just_cruisin tell who what his qualifications are, I think he would get more of a giggle out of it than I

[Gwagensteve]

I personally have no problem with the use of poly but it's not legal in Victoria, so for us, there's only one "con" for poly and it's a big one.

Using RHS is a structural member is totally fine. I'm sure it is possible to make a very sound body lift out of RHS. The problem is, it seems that most of the people who use RHS for body lifts also can't design a part properly. I've seen a cab come off a chassis due to an RHS body lift that was PURCHASED. IT was clearly very badly designed.

The fact is, it's just easier to make a poly/alloy/steel body lift with socket bolts and never have to think about it again rather than try and design an RHS BL that is durable, simple and safe.

Steve.

[Trojan]

royce wrote:

I dont like to add useless posts to tech threads cause there is too much of it already but how can you reason this statement?

How do i have to reason my statement?

To have a vehicle legal with a body lift, you must have it approved. Every state is different, but in NSW you must have the modification passed and approved by an NSW Engineering Signatory who will issue an Engineers Certificate.

If the Engineer you are using says NO to Poly Blocks, then you can argue all you like about the strength, the simple fact is you're not going to get it approved and Poly is absolutely no good to you.

You could just as easily make a strong body lift out of RHS or even Wood, but again, if an Engineer says NO, then NO is the answer. Between Poly and Metal blocks, Poly is the one an engineer is most likely to say No to, fairly simple really.

Throw what Steve said above, of Poly being illegal in Vic, you're running into a fairly major problem with using Poly Blocks and it's not a strength issue, but the issue that actually matters the most.