User Login    
 + Register
  • Main navigation
Login
Username:

Password:


Lost Password?

Register now!
Fast Search
Slow Search
Google Ad



Browsing this Thread:   1 Anonymous Users





Re: chop springs
No life (a.k.a. DattoMaster)
Joined:
2002/8/6 2:24
From Brisbane, Australia
Group:
Registered Users
Posts: 3792
Offline
Quote:

Coops wrote:
L18_B110 - Just think about it.......
Take a helically wound piece of round bar (a spring), then compress it.
Take any cross section of the spring & see how it deforms..... Yep, It twists!
Like it or not coil springs are torsionally loaded (as opposed to shear, tension, comprssion etc).

All coil spring engineering / design is based around this principle.... Of course because the "torsion bar" coils back on itself, it acts in series, so you have to take into account the number of coils to get your spring rate.

Either that or I wasted 8 years of my life studying part time for an engineering degree for nothing.

This brings me to my next point.....
PIGDOG - What I'm saying is that when you cut your coils, you change the spring rate.
For the worse....? I suppose that depends on your setup & what you want to use it for.
For road use, (or maybe even a budget racer) you probably wouldn't notice much difference, but pop down to your local circuit & see what the quick guys are running..... Bet you won't find any cut coils.

Feel free to prove me wrong though......


well I tried, but while writing my post about the difference between a coil and a torsion bar, I came to the conclusion that you were right... lol ...about a coil just being a wound up torsion bar that is.

You don't need fancy store bought springs for good handling. My coupe's strength was always its corner speed.

Posted on: 2007/7/12 6:51
_________________
"if you're not on the edge, you're just taking up space"
Transfer the post to other applications Transfer


Re: chop springs
Guest_
datsun competition manual cant be wrong... it suggests choped springs ftw. especially 240z ones. dont know what the rta was thinking!


my old king springs loked like they were crap from the factory, the cuts on them looked worse than an angle grinder would have made. thats why lovells gets my vote but they arent low enough.

waiting on a price for soft progresive rate springs for mine thats are long but compress down heaps with the weight of the car then are hard as a rock from there. not hard but not easy to get made either.

Posted on: 2007/7/12 12:45
Transfer the post to other applications Transfer


Re: chop springs
No life (a.k.a. DattoMaster)
Joined:
2004/10/28 11:35
From Geelong, Vic
Group:
Registered Users
Posts: 6184
Offline
200b ones are progressive mik

Quote:

perthute wrote:
so the stanza struts are ment tooo make a 1200 look like your changing the wheels lol
unless you put low springs in em


yeah pretty much

Posted on: 2007/7/13 1:49
Transfer the post to other applications Transfer


Re: chop springs
Home away from home
Joined:
2007/7/9 3:52
Group:
Registered Users
Posts: 180
Offline
in qld cutting springs is ilegel no heating cutting of suspersion compon is highly ilegal

Posted on: 2007/7/13 2:50
Transfer the post to other applications Transfer


Re: chop springs
Home away from home
Joined:
2003/1/24 12:14
From Quairading, Western Australia
Group:
Registered Users
Posts: 494
Offline
my new project car is running struts with cut coils

however they are going as one is a cut 120Y and the other is a cut 200B rear coil

not having unbalanced springs on my car!

otherwise I'd be keeping them!

yeah but the DCM (datsun Competition manual recommends shorter inserts too

Posted on: 2007/7/13 3:48
Transfer the post to other applications Transfer


Re: chop springs
No life (a.k.a. DattoMaster)
Joined:
2006/5/5 4:46
From perth airport
Group:
Registered Users
Posts: 5432
Offline
ok well i chopped them :) looks good and now driveable ..... i was lazy and cut em while they where on the car lol NOT a smart thing too do hehehe im stil alive tho so its all good

Posted on: 2007/7/16 0:15
Transfer the post to other applications Transfer


Re: chop springs
No life (a.k.a. DattoMaster)
Joined:
2003/6/27 14:53
From Southern Tablelands N.S.W. Australia
Group:
Registered Users
Posts: 8287
Offline
Quote:

unfamilia wrote:
datsun competition manual cant be wrong... it suggests choped springs ftw.

I have had a good look through my factory "Datsun B110 Comprtition Tune-up Manual' & it makes no reference to cutting springs at all.
Instead, the factory offered both lowered springs as well as a new strut with adjustable coil-overs.

What competition manual are you refering to?

EDIT
The Nissan Motor Corporation USA "Datsun 1200 Competition - Suspension' manual goes into detail about how to modify stock struts to have adjustable spring seats & use stock sized springs, but makes NO reference to spring cutting.

So, which competition manual are you reading?

Posted on: 2007/7/16 3:38
_________________
Love your Datsun.
Treat it well.
Transfer the post to other applications Transfer


Re: chop springs
Home away from home
Joined:
2004/8/14 10:51
From Bris-Vegas
Group:
Registered Users
Posts: 726
Offline
Quote:
well I tried, but while writing my post about the difference between a coil and a torsion bar, I came to the conclusion that you were right... lol ...about a coil just being a wound up torsion bar that is.


I've been doing some more thinking (Ouch ).

It's clear to me by now from everyone's comments that cut stock springs do work.

Thinking about it..... This is because when you reduce the number of active coils you're effectively shortening your "torsion bar" giving a firmer spring rate & ride which makes the car handle better.

The problem with this is that in giving a firmer spring rate, you are applying a greater stress & bringing the material closer to it's failure point..... Potentially nasty!

Kings / Lovells / Koni etc achieve the same thing in terms of spring rates by using thicker bar and superior spring material.
Same performance, greater reliability (safer).
i.e; The right way to do it.

So (EDIT: PIGDOG, this is for you), I withdraw my "go v's show" statement.
The performance of cut springs should be the same (ignoring seating issues) as some aftermarket springs.
The issue is longevity & safety, which is largely dependant on the skill of the person performing the work.

You win some, you loose some

Posted on: 2007/7/16 5:24
_________________
CA18DET '74 1200 ute project
Transfer the post to other applications Transfer


Re: chop springs
No life (a.k.a. DattoMaster)
Joined:
2004/10/28 11:35
From Geelong, Vic
Group:
Registered Users
Posts: 6184
Offline
your statement is exactly why i said you should go find some heavier springs befre cutting them, as stanza ones are still going to be to soft when you cut them

Posted on: 2007/7/16 6:02
Transfer the post to other applications Transfer


Re: chop springs
No life (a.k.a. DattoMaster)
Joined:
2006/5/5 4:46
From perth airport
Group:
Registered Users
Posts: 5432
Offline
the cut stanza springs are harder than the 1200 ones :)

Posted on: 2007/7/16 6:13
Transfer the post to other applications Transfer



« 1 2 3 4 (5) 6 »



You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.

[Advanced Search]