Cutting Springs Tech

[DRFTPG]

I always though springs go a tad harder when you cut them?
but a friend of mine was saying they go softer?

who is right?

and I'm talking about cutting them with a cutting disk none of this heating up shit!!

[johl]

not again.....

[Jonny Rochester]

This is the formula for spring stiffness:
K = (W^4 x 12000000) / (8ND^3)

K = spring stiffness in lb/inch
W = wire diameter in inches
N = number of active coils
D = coil diameter in inches

N is the number of coils. From the formula you can see, as N decreases K increases.

So the answer is, springs get harder as you cut them shorter.

BUT not that much harder.

[jjoeworks]

Great responce Jonny. Just one question: what is ^. Sorry for my ignorance.

cheers

[Anthony]

raised to.. power of. 2^3 is 2 cubed or and 4^2 is 4 squared

[Jonny Rochester]

K = (W⁴ x 12000000) / (8ND³)

I just realised in this modern age I have a superscript button.

12,000,000 is the torsional modulus of steel, which is listed as 11,250,000 in other places. Depends on what steel your using.

[Gullie]

Genius

[ronin_SPL]

They do get a bit harder and bounce a lot, don't be cheap and buy proper ones. :lol:

[Anthony]

<div class='quotetop'>QUOTE (4a-cnt @ Feb 9 2008, 09:21 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=483140)</div>
They do get a bit harder and bounce a lot, don't be cheap and buy proper ones. :lol:[/b]

Thats what your shocks are for. :) Nothing wrong with cutting springs if you think about what you're doing.

[Gunner]

^^^ problem is not many people do, they just start cuttin, then wonder why the car high side when they turn hard, cut springs are stupid, and people will realise that when they lose a mate cause they told em to cut their springs.

yes there is a way to do it but its not right, don't be a tight ass.

There is a reason it is illegal and that is because it is stupid, dangerous and damn right ignorant, risk someones life for the sake of a couple hundred bucks, no offence but if u do it or have done it ur a fucking idiot.