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Old 04-24-2012, 02:15 PM   #1 (permalink)
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Cutting coil springs?

I need to lower my rig about 3" in the rear. Instead of buying different coils...
Can I trim the coil, then using a torch... heat up the trimmed end, just 3" or so... In order to bend the trimmed end up a bit so it'll sit flat on my coil mount? Or will the heat ruin the spring steel?
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Old 04-24-2012, 02:23 PM   #2 (permalink)
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Nevermind. I found a How To link:
http://speeddirect.com/index.aspx?nodeID=173
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Old 04-24-2012, 02:31 PM   #3 (permalink)
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i disagree with that link. between friends fucking up their car's ride quality in h/s and this video i'm going with torches being a bad idea. just use a cutoff wheel like he says and cut in quarter turns of the circle.
Quick Tip - Cutting Springs - YouTube

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Old 04-24-2012, 02:34 PM   #4 (permalink)
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I used a chop saw all the time cutting springs back in my lowrider days.
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Old 04-24-2012, 02:35 PM   #5 (permalink)
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I plasma cut mine.

Quick and easy.
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Old 04-24-2012, 02:37 PM   #6 (permalink)
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Ya the torch is a bad idea softens the spring to much. Just use a cut off wheel and cut to whatever length you want
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Old 04-24-2012, 06:29 PM   #7 (permalink)
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The cutting part isn't the issue. If you simply trim a coil back, the trimmed end isn't going to sit flat. So, you must bend the trimmed end of the spring which requires heating. The heating process if overdone will ruin the spring steel.

The heating & bending part is my concern.
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Old 04-24-2012, 09:48 PM   #8 (permalink)
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I just used a cut off wheel and left the spring as it was. No issues.
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Old 04-25-2012, 01:12 AM   #9 (permalink)
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Quote:
Originally Posted by barillms View Post
So, you must bend the trimmed end of the spring which requires heating. The heating process if overdone will ruin the spring steel.
If you heat spring steel to the point you can bend it, you've annealed the steel and it takes the strength out of it. It will likely break where you heated it because that part of the spring is softer than the rest and it will be forced to flex more.
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Old 04-25-2012, 06:51 AM   #10 (permalink)
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I've bent a "pig tail" into a couple springs, I clamped a pair of vise grips on the spring and hung some wet rags around it to absorb the heat. It never got hot past the vise grips.
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Old 04-25-2012, 07:24 AM   #11 (permalink)
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I had no idea wet rags absorbed heat

I just need the last 4" or so of coil to bend up a smidge so I can trap it down with my mounting plates.
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Old 04-25-2012, 07:29 AM   #12 (permalink)
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Wet rags dont absorb heat exactly, but the water converting to steam required a bunch of energy. A the heat travels up the coil it will heat the water in the rags making steam. There certainly is a cooling effect.

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Old 04-25-2012, 07:33 AM   #13 (permalink)
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Quote:
Originally Posted by barillms View Post
I had no idea wet rags absorbed heat

I just need the last 4" or so of coil to bend up a smidge so I can trap it down with my mounting plates.
really? or are you being a smartass?

The vise grips help also, by redirecting part of the heat flow.

You just don't want to overheat the spring. If you run the torch hot where it will heat up the spot you need to bend quickly, then it wont heat the rest of the coil as bad.

How are your mounting plates made?
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Old 04-25-2012, 11:07 AM   #14 (permalink)
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Worked perfect.
Trimmed it to length, put the end rung in the vise & collapsed it to where I wanted it so the bottom is flat. Ground off the paint & heated a 2" section of the bottom rung where I needed the bend to occur. Used a map gas hand torch, wasnt even red hot. Let the vise loose, and she stayed in place.

I used a wet rag clamped to the rung to keep heat from spreading up the coil.

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Old 04-25-2012, 11:14 AM   #15 (permalink)
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I did it on a car I didn't want to put more $$ into. Took a piece of old driveshaft tube as a form to bend the end around, heated it up and bent it. Worked fine.

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I need to lower my rig about 3" in the rear. Instead of buying different coils...
Can I trim the coil, then using a torch... heat up the trimmed end, just 3" or so... In order to bend the trimmed end up a bit so it'll sit flat on my coil mount? Or will the heat ruin the spring steel?
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Old 04-25-2012, 02:35 PM   #16 (permalink)
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Should work fine, I've never had any problems.

Keep in mind that cutting it shorter increases the spring rate though.
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Old 04-25-2012, 06:15 PM   #17 (permalink)
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I'll keep that in mind. It's prob not a bad thing to be honest.
They're soft!
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