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Old 04-04-2012, 02:50 PM   #1
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I just broke the rear coil - Pro Comp

After driving 1000 km, the coil broke. Some light off roaring, no hard core torturing, no noise... Can you believe it? How did I do it?

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Old 04-04-2012, 02:52 PM   #2
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Old 04-04-2012, 02:56 PM   #3
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Quote:
Originally Posted by KebHund View Post
After driving 1000 km, the coil broke. Some light off roaring, no hard core torturing, no noise... Can you believe it? How did I do it?
did you install the proper length of bumpstop extension required to prevent coil bind for your specific coil's compressed height?
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Old 04-05-2012, 12:47 AM   #4
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Just light of roaring... The fact is, the Pro Comp regular coils are softer than stock, so the car was moving even when shifting. Also, I did not have bump stop - 2,5"lift. But come on, These part have to be a bit reliable...
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Old 04-05-2012, 12:56 AM   #5
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ProComp's springs are actually very good quality, I'd say that was a fluke breakage.
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Old 04-13-2012, 10:02 AM   #6
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Also, I did not have bump stop - 2,5"lift. But come on, These part have to be a bit reliable...
You complain about reliability, yet you have no bumpstops? The coil is bound up and gets hammered every time you bottom out, and you wonder why it breaks?

Buy a new set of coils, set your bumpstop extensions properly, and I highly doubt you have more broken coil problems.
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Old 04-14-2012, 11:41 AM   #7
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I absolutely agree with what you say. I am learning incredibly lot from this forum. Actually, how I recognized it was broken was when I was installing the bump stops:-).
But anyway, once you are producing the coils for Jeep type cars, you should make them stiff the way the coils do not go over so easy.
As said, no jumps, just light off roading.

Also, having a Jeep for half year now, I am surprised all the screws get loose or destroyed... Physically, afer every off roading I have to invest in repeirs and fixings. Not Patrols or even Suzuki Samurais. I did not have this expectation from such a legend.
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Old 04-14-2012, 11:46 AM   #8
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...But anyway, once you are producing the coils for Jeep type cars, you should make them stiff the way the coils do not go over so easy...
The coil springs are not responsible for that, the shock absorbers are.
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Old 04-14-2012, 12:04 PM   #9
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The coil springs are not responsible for that, the shock absorbers are.
WHAT? Come on Jerry. consider rethinking that.....rewording that.

If properly bumpstopped, no spring should break even if shocks removed providing axles can't drop too far, and even then, springs would pop out of their perches.

I'm thinking he either got a rare bad spring or over compressed it too many times and has too hard a butt to realize it....you can BELIEVE he's disappointed after paying to buy American and paying shipping and taxes and Duty to get it, then THIS happens.

Perhaps he's the victim of over marketing hype where he doesn't realize neither Jeeps nor our aftermarket offerings are all they claim to be....We here know, or quickly learn these things lots cheaper than they there do.

Lets offer him our real world experiences and assistance troubleshooting and help him select the best of our products and cautions associated with same.

You are a super smart and experienced Jeeper, Jerry. I respect the hell out of you. Help this guy with your knowlege, and experience like you do me.
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Old 04-14-2012, 12:12 PM   #10
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WHAT? Come on Jerry. consider rethinking that.....rewording that.
One of misread what he was saying when he said the springs need to be stiffer. I was saying that stiffening the springs is not the fix to his problem. Shocks are what stiffens a suspension, springs have very little to do with how stiff a suspension is.
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Old 04-14-2012, 12:53 PM   #11
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One of misread what he was saying when he said the springs need to be stiffer. I was saying that stiffening the springs is not the fix to his problem. Shocks are what stiffens a suspension, springs have very little to do with how stiff a suspension is.
I ain't going to take you to task on word defs, but in my book, "stiffness" is another word for spring rate, which describes how much weight is required to compress a given spring a set measure...IE, 160 SR means it takes 160 LB's force to compress a spring 1 inch...and another 160 LB's to compress it an additional inch, unless it's described as a vailble rate or 'progressive' rate spring.....So, no matter what the 'stiffness' or spring rate, it's still a spring and will compress and spring back when that weight applied and released.

All any shock does is DAMPEN, or SLOW the spring from bouncin in reaction to whatever weight forces are placed and released on it......All any spring does is react to loads and compress and relax in reaction to them.....Spring rates should only be used to match the expected loading by weight of vehicle and cargo, where you can expect to lose sprung height per every rated unit of load....IE, 320 LB's cargo would compress springs 2" if rated @ 160 SR.

A properly selected 'for-travel' shock of ANY damping will simply slow and absorp the springs desire to 'spring' in reaction to loading and unloading without first running out of travel at either end...higher or more heavily valved shocks will offer more resistance to spring bounce, but not limit the travel of the axle from full compression to full extension, nor will it change spring rate.

That said, no shock can cause a spring to break....If the shock itself was improperly selected, then it or it's mounts would break from over compression or over extension, or allow a more or less bouncy ride....and if the axle is properly bumpstopped the spring is protected from destructive coil bind..

So, my advise for him is to back up and discover if he has asked too much of his springs...To remove both springs and shocks, then determine full travel of each end of his axle, then properly bumpstop it to prevent tires from getting into his tubs or flares, and prevent coil bind, then select shocks with more travel than his stops and drops, then select springs for desired ride height when loaded with expected load, and to measure or check coil compressed heights against his reality, then perhaps tweek shock/spring dampening and spring rates, to get ride quality and load capacity he desires.
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Old 04-14-2012, 12:57 PM   #12
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In my book, stiffness also includes how stiff the shocks are. Soft shocks make for a soft ride, stiff shocks make for a stiff ride. Remove your shocks sometime to see how stiffly or softly the Jeep rides afterward.
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Old 04-14-2012, 01:04 PM   #13
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In my book, stiffness also includes how stiff the shocks are. Soft shocks make for a soft ride, stiff shocks make for a stiff ride. Remove your shocks sometime to see how stiffly or softly the Jeep rides afterward.
Yeah, they both do effect the feel of the ride fersure....Hey, that's why the big three's suspension engineers get the big bucks....They know the all theory like I described, but they have the resourses to play with it all
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Old 04-14-2012, 01:11 PM   #14
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BTW Jerry....It's my day off so I'm sippin blended whiskey and can't be held accountable for anything I say from here forward...If the UPS guy had delivered my parts, then I'd remain more sober, but ALAS, he already putted past my crib
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Old 04-14-2012, 01:14 PM   #15
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Hah it's a good thing I wasn't posting anything serious yesterday afternoon or last night. I was coming off a general anaesthesia for a test that left me loopy afterwards. I'd much rather it had been a good whiskey... better yet a good single-malt scotch lol.
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Old 04-14-2012, 02:18 PM   #16
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Hah it's a good thing I wasn't posting anything serious yesterday afternoon or last night. I was coming off a general anaesthesia for a test that left me loopy afterwards. I'd much rather it had been a good whiskey... better yet a good single-malt scotch lol.
"Single Malt Scotch", huh? Funny you should mention that...I recently discovered I have a taste for it....Yup, I've always had a taste for sippin whiskey and sampled many hi-rated blends, but Scotch always seemed just plain old mobetter.

Plus I recently discovered my real Dad was full blood Scott (Wirt Val Stewart) and a WWII all Army Golden Gloves Champ, and an ex con from way back in the 20-30's and rode a '39 Harley and served as the oldest combat soldier in Nam twice, plus Korea and a WWII Normandy glider surviver, and all that it made me admit a few things about myself and my heridity in general, and explained some of my friggin hardheadedness...So yeah, I'm coming out of the closet and admitting I prefer scotch whiskey, and I'm willing to undergo the sex change and try single malt....Please suggest one?

I need to get stupid drunk on quality real scottish whiskey and talk to that guy...He's got things to share and so do I before I forget or die.
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Old 04-14-2012, 02:33 PM   #17
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Hah, nice stuff I just read there... especially on your dad!!

Single-malt Scotches are like cuts of meat... widely varied and lots of different cuts and tastes. A good inexpensive single-malt is Glenlivet 12 year old. That's my anytime casual sipping stuff. It's also usually about the least expensive you'll find at most bars and what I have settled on except for special occasions.

What really got me going on single-malt scotch though was Bowmore 12 year old. Bowmore has a distinctly peaty taste since the water that makes it is filtered through the local peat bogs where it is made. That's a bit of a strong flavor for beginning single malt drinkers but once you get past the first couple sips, it grows on you.

Bunnahabhain is something a friend recently introduced me to and it's probably my current favorite but it's a litte more $$$ than the Glenlivet or Bowmore. We might like it because its name is so fun to try to pronounce once you've had a little too much.

I'm by no means even close to being a single-malt scotch connoisseur by any stretch of the imagination. What did help was finding a good liquor specialty store that has the little mini-bottles for sale so I could sample a dozen or so without paying for the full size bottles.

Do share it with your dad, he sounds like the type of guy that would have some wonderful stories to share once the scotch has him loosened up a bit. A friend of mine is in the Marines and I could never get anything out of him until lat one night in my tent trailer while on an offroad trip after several scotches. We talked about stuff he'd never talk about sober and it was a great evening spent drinking some fine scotch I had brought along.
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Old 04-14-2012, 03:06 PM   #18
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Hah, nice stuff I just read there... especially on your dad!!

Single-malt Scotches are like cuts of meat... widely varied and lots of different cuts and tastes. A good inexpensive single-malt is Glenlivet 12 year old. That's my anytime casual sipping stuff. It's also usually about the least expensive you'll find at most bars and what I have settled on except for special occasions.

What really got me going on single-malt scotch though was Bowmore 12 year old. Bowmore has a distinctly peaty taste since the water that makes it is filtered through the local peat bogs where it is made. That's a bit of a strong flavor for beginning single malt drinkers but once you get past the first couple sips, it grows on you.

Bunnahabhain is something a friend recently introduced me to an it's probably my current favorite but it's a litte more $$$ than the Glenlivet or Bowmore. We might like it because its name is so fun to try to pronounce once you've had a little of it.

I'm by no means even close to being a single-malt scotch connoisseur by any stretch of the imagination. What did help was finding a good liquor specialty store that has the little mini-bottles for sale so I could sample a dozen or so without paying for the full size bottles.

Do share it with your dad, he sounds like the type of guy that would have some wonderful stories to share once the scotch has him loosened up a bit. A friend of mine is in the Marines and I could never get anything out of him until lat one night in my tent trailer while on an offroad trip after several scotches. We talked about stuff he'd never talk about sober and it was a great evening spent drinking some fine scotch I had brought along.
Oh, I'll share it with him fersure...I dig him up every now and then and rely on what he would say if he was still alive..He would be well over 90 now and he's gotten lots smarter watching me.

Filtered by peat? Natural growing harvested peat? sounds good...I tend to pee off the back porch and can imagine how the sod there might filter and flavor the waters that leach down to someday be used again...with that in mind, you might understand why I wouldn't wanna drink nuthing Irish or especially French
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Old 04-14-2012, 03:23 PM   #19
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I like the direction this thread has gone


As for the OP, what screws keep coming loose after you go off road?? In 120k miles I haven't had one nut, bolt, or screw come loose? Pictures would help too
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Old 04-14-2012, 04:04 PM   #20
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Jerry I agree Glenlivet 12 is indeed a great single malt. My brother bought me a bottle at the airport duty free. I was very impressed with it! My current favourite is Glenfidich 18 single malt but it is a little on the expensive side so I usually just settle for JW Black scotch.
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Old 04-14-2012, 07:46 PM   #21
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shocks SLOW down the cyclic bouncing motion of springs....basically so the spring doesn't oscillate.

from a math standpoint, the shocks are the only time dependant component of your suspension. what you perceive as a "stiff" or "soft" ride occurs over time.

Well, just like the springs have a rate that describes how much they compress with static weight applied to them, the shocks have a rate that describes how fast or slow they will compress and rebound with something external pushing/pulling on them.

unless we're talking about stupid heavy rate springs that basically act like a go-kart with no suspension, the spring has a whole lot less to do with ride than shocks do.

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