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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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02-04-2011, 07:22 AM | #363 |
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Do you know who made yours? Is it something you can pick up at the local welding supply? What would you ask for?
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02-04-2011, 09:04 AM | #364 |
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Good News and Bad News
The good news is the car is closer to completion, the bad news is that I'm down grading to a stroked L76 (404 ci) to make it happen, and am selling the LS7 heads. This should knock me down from about 670 hp to 600 hp. Not the end of the world. There's always forced induction if I need more power. But since I want to race in street tire classes, I probably won't need any more hp.
Out: LS7 Corvette Z06 Heads with REV valves and dual springs - eBay (item 130482421966 end time Feb-12-11 18:58:58 PST) In: For those not in the know, an L76 is basically an LS2 4.00" bore block with LS3 heads. It was used in a bunch of Holdens, but only the Pontiac G8 state side. Paying for the big bore block the LS7 heads require was going to slow me down too much, and I got a crazy good deal on the L76, so here we are. I took some calipers to the ports on the LS3 heads and intake. The plastic intake was as small as 28.9mm accross in the smallest port while the head's port got as large as 31.8mm. It was probably a smart move on GMs part to make sure that there wouldn't be a step down going into the head's intake ports regardless of sloppy tollerances. But obviously there is room to improve by hogging out the plastic intake close to 1mm all around. Normally the LS3 intake uses a nifty re-usable rubber gasket o-rings. Not a lot of help for gasket matching the heads to the intake. I had been told that the carb spyder intakes for the LS3 had gaskets that were too big to be of use also. I started a thread on the topic here: Gasket Matching an L76 intake - LS1TECH But I found a company called SCE that sells gaskets that are smaller than the head ports and are perfect for gasket-matching. The gaskets aren't perfectly square or perfect, but at least they aren't too big.
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02-04-2011, 03:46 PM | #365 | |
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Don't hold me to this one but I THINK it's called Durarod.. Or something like that.. The only way I can tell the rod is similar... It crumbles under direct heat without any sort of flux. |
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02-05-2011, 10:20 AM | #366 |
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The LS1 valve covers I have don't clear the offset rockers of the LS3 heads. Trimming the inside divider walls should do the trick, but if you're running a standard PCV set up this can create a lot of oil getting out. I'm running a dry sump with a breather so I'll just seal the valve covers and not worry about it.
I wanted to keep the coils in the stock location to keep the spark plug wires as short as possible. A lot of the coil relocation kits look cool, but I consider them un-functional. The new LS9 valve covers eliminate the coil mounting brackets and bolt the coils straight to the valve covers. But I think it's probably a good idea to get some vibration damping to the coils. These are pretty!.. Pretty pricey $180 $260 LS9 covers come with 6 coils $$$ my fav DIY!!! $free! 407 grams vs OG 599 grams A little polish and paint...
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02-22-2011, 12:39 PM | #369 |
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Stockbee asked me for a spring reccomendation. Here's my reply
My question at this point is this: What spring rates are going to be appropriate for the added heft of the car in the front? Have any recommendations? I've heard you added about 100 lbs to the front of the car but that the rest of the added weight is from the transmission which is centrally located. I believe that the 240 spring rates shouldn't change even after the addition of an LS1. The LS1 weighs something under 450 lbs, while both the sr20 with a turbo, and the ka without, each weigh 490. However the T56 is a beast at about 140 lbs, at least 60 lbs more than any of the nissan transmissions. Fortunately the t56 weight sits right in the middle of the car not affecting the chassis balance. My Ohlins came stock with 8 kg/mm in front and 6 in rear. Here's an example of an LS14 MMDBs corner weights: "Front driver: 878 Rear driver: 697 Front Passenger: 863 Rear Passenger : 682 55.8% weight in front 44.2% weight in rear (A stock s14 is 55/45, and with the addition of a driver the s14 will usually shift an entire 1% rearward) Cross weights within .5% (within ideal, max being 1%) Total weight including myself in the car with 1/4 tank of gas, no spare tire, and everything else intact (passenger seats etc): 3120 Without me in the car: 2970 A little bit heavier than I anticipated (was thinking 2900 most), but that's with everything in the car minus the spare tire. Also, the battery is located in back of the car as well." Another LS1/T56 s14 built by Hinson weighed in at 2742 total with no exhaust, and everything stripped out of the trunk. a S14 weighs 2832 stock. That's 140 less than MMDBs stock LS1/T56 car, and 90 more than Hinsons! 8/6 = 450/337 lbs/in Which sounds low, but you have to remember that the fronts are struts which have exactly a motion ratio of 1:1 and the rear places the coilover outside so far that they also have a motion ratio of 1:1. Most unequal length cars have higher motion ratios and therefore need more spring. For autocross a lot of people have oversteer problems with an aftermarket front sway and a stock rear. Since the front camber gain sucks with the front strut design I plan on going overkill on the front sway bar to limit travel a bit. In the rear I may go even softer so that I can run a decent sway bar in the rear. Sway bars equalize traction on acceleration in the rear. A lot of guys just completely remove the rear sway, but in a high hp car I don’t think it’s the way to go. For road course or drift-use you can definitely run stiffer springs. Most guys that have tried anything over 10 (564) in the front usually go back down. MMDBs 2900 lbs may sound like a lot but There's almost 400 lbs he could ditch if he wanted to. Weight Reduction- A/C 30 Trunk lining 3 Carpet padding and tar- 30 Interior plastic and headliner 10 Sunroof 24 Steering wheel 6 Pass Air bag 8 Body Panels Hood 40 Trunk 10 Battery- 25 Wheels 2lb x4 8 Spare tire and jack 30 Seats front 50 Seats Rear 39 Bumpers and tow hooks- 80 Body Holes & hardware 10 403 lbs. There's no reason an LS14 couldn't get below 2600 lbs dry. With a cage and massive wheels I'm hoping to hit low 2700s. I'd start with 8/6 like the Ohlins maybe 5 in the rear for autocross or street or 9 in front for dedicated track
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03-18-2011, 09:55 PM | #370 |
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I have an alternator out of an '06 GTO, and it's heavy! I wanted to get it as low as possible, so I came up with this contraption.
Then I had to clearance the motor plate a bit.
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05-05-2011, 08:48 PM | #371 |
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radiator mount and a starter that works.
I originally bought this fancy, new, high-torque, MSD starter. It was supposed to be adjustable. But every adjustment hole just moved the reduction motor out further in the way! My header secondaries are 2" OD, and I needed the header to be almost no wider than the starter mounting bolts. Found a 2008 Avalanche 5.3 starter that looked like it might fit the bill. At $180 less than the MSD it seemed like it would be worth a shot. It works perfect!
Manufacturer Part Number: 6494NSurface Finish: Painted/MetalInterchange Part Number: 89017440, 89018123, 8000288, 88861935Warranty: YesOther Part Number: 89017440, 9000939, 8000045, 8000150 The pretty 3 hp MSD starter that doesn't work Here's the one I bought. Hopefully it won't get tired on my hi compression stroker motor. It gains me at least 5/16" of clearance over the MSD starter! Starter Family: Delco PG260D Type: PMGR Voltage: 12 Volts kW: 1.2 kW = 1.63 hp Rotation: CW Teeth/Splines: 9 Teeth/Splines Pinion/Splines OD: 25.2mm / 0.992in Mounting Hole 1: 10mm ID Unthreaded Mounting Hole 2: 10mm ID Unthreaded Approximate Weight: 7.5 lbs / 3.41 kg And a little progress on the lower radiator mounts: I welded a stock s14 upper radiator mount below the powerbrace. Then welded 10mm rod to the bottom of the radiator that the stock upper mount style grommets fit onto. This will locate the radiator bottom in every direction, other than vertical. I like drilling holes in things. The weather is finally decent, so I'm going to re-start my rear subframe reinforcement project soon. I have a bunch of stuff that I want to paint the back of BEFORE I weld. What do you guys use? I've heard of guys using BBQ grill paint, and header paint... Any suggestions?
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05-10-2011, 11:55 AM | #373 |
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I found out that 3m makes a weld though primer, but something more permenant (paint) would be ideal. I want to beable to box in sections and not worry about rust on the inside.
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05-10-2011, 12:19 PM | #374 |
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The weld thru is for when you have to weld 2 overlapping panels together and then you would obviously not have access to get paint in there. The weld thru won't burn up like regular paints or coatings. So if you are wanting to be able to get into a boxed-in area like a frame rail for example, then you would need to use a gun that has a long rod and a 360 degree attachment. Out of this gun you typically spray an epoxy over the bare metal inside the area, then back over that with a wax. The 360 degree tip allows you coat everything inside there. You obviously want all of your welding done first.... so you just need to make sure you have an access hole to get the rod/tip into the area you want coated. Usually these guns are $300-$400 dollars. So I would simply ask a local body shop if they can do it for you for a fair price.
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05-10-2011, 12:39 PM | #375 | |
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Quote:
If 3m weld through primer isn't meant to be painted over (once it's under a lap) you'd think they'd call it paint.
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05-17-2011, 09:19 AM | #376 |
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Rolled some fenders for some friends last night. My buddy scored a set of 18x10.5 +15 TE37s. He is running KYB AGX dampers which are a good bit more narrow than most coilovers, but he still had 26.8mm of clearance to the dampers! That means 18x10.5s could have +41mm of offset without hitting narrower dampers!!! Or you could run the same front space and still fit 18x11.5s. These pics are from before we did a little pull, but he had already rolled a bit. And he maxed out the camber of the stock arms, 2+ degrees of camber I'm guessing.
26.8mm clearance. His 245s look like dangerous stretch to me.
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05-23-2011, 09:02 AM | #377 |
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I've been a little concerned about using the manley pistons that I have with the oliver rods that I have. Originally I was going to custom order some low compression height Wiseco pistons, but the long block parts I got were just too good to pass up. My pistons have a standard compression height designed to be used with what has become the LSX standard 6.125" aftermarket rod. My oliver rods with the lube tubes are 6.200".
The taller rods necessitate a taller gasket. A stock LS7 gasket is 0.054" thick compressed. With the taller rods (presuming all of my measurements are exactly as advertised... unlikely) I'd need a 0.105" tall head gasket. Cometic stocks up to 0.125"! To put that into perspective for the import guys that's 3.2 mm thick! Found this here on ls1tech about variances in LS2 deck heights by ChucksZ06 back in 2006 Piston Deck Height for stock LS2 [Archive] - LS1TECH "My first ls2 block with 4" eagle crank and rods was .005 in the hole. I am now doing an ls2 block with a stock crank and 6.125 rods( same length as 402 build), same piston manufacturer and the pistons are .008 out. I think the stroke on the 4" crank was not quite right. So from my experience you pretty much have to mock up the parts or it is guessing. Good luck." Keeping the top ring below deck seems like common sense. It's common for the crevice height (top of piston to top of top ring) on performance pistons to range from about 0.180 - 0.320". So presuming (what I consider) a loose quench of 0.035" and super tall 0.125" gasket you should still be safe with low crevice volume pistons all the way down to a crevice height of 0.160". Still that's a little too close if you're running a low crevice height pistons near 0.180". 9.240" stock LS1/2/3/7 Deck height 2.000" less 4" stroke/2 1.115" less my manley piston's compression height (was designed for a 6.125" rod) 6.200" less my lube-tube oliver pistons puts me 0.075" out of the hole. for a tight 0.030" quench I'd need a custom 0.105" thick gasket. I also found Lingenfelters book on google. He mentions that he reccomends 0.250 crevice height for street engines, but has seen all the way down to 0.100" on all out N/A drag engines! Good read: John Lingenfelter on modifying small-block Chevy engines: high performance ... By John Lingenfelter John Lingenfelter on modifying small ... - Google Books
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05-23-2011, 12:42 PM | #378 |
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You just don't want to many anything easy, do you
I'm assuming you've already done the combustion chamber math with the 6.200" rods?
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05-23-2011, 01:30 PM | #379 | |
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Here's a cam I'm considering having ground that would work with a stock chamber with just a .005" clean up mill to 68cc chambers. This cam has 4 degrees of advanced ground in. I'd like to run a few degrees less advance, but I like the idea of not taking the chambers too small incase I ever want to go forced induction.
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05-23-2011, 09:45 PM | #380 |
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Very sexy! That's a very standard 'aggressive' ~402ci cam setup, and 8.75:1 DCR is beautiful. 113 +4 might sound like a wide split with a lot of advance, but that's a big lobe. I'd say it looks fantastic.
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05-27-2011, 05:57 PM | #381 |
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I was pulling apart a Z32 rear subframe and noticed this reinforcement that the s14 doesnt have. Can't decide if it's worth replicating or not.
I also scanned the Ohlins instructions manual to pdf files, but they are of course in Japanese and I can't read them. If any one can help, or knows anyone that might be willing to translate them for me, please shoot me a pm and I'll email the pdf files to ya. Thanks guys!
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BURN OUT IN YOUR FACE! 1998 S14 LS7/T56 swap in progress, build thread: http://zilvia.net/f/tech-talk/147301...d-gto-pan.html Last edited by SicBastard; 05-28-2011 at 08:50 AM.. |
06-08-2011, 11:20 AM | #383 |
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FINALLY found a rod end adjuster that has LH and RH threads in one piece
QA1 Precision Products AS12-12 - QA1 Rod End Linkage Adjusters $11.99, Linkage, Rod End Adjuster, Chromoly Steel, 3/4 in.-16 RH Female Thread, 3/4 in.-16 LH, Male Thread, Each QA1 Precision Products AS12-12 - QA1 Rod End Linkage Adjusters - Overview - SummitRacing.com I wanted to modify my stock RUCA and FLCA and this was the one part that was holding me back.
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06-09-2011, 09:46 PM | #384 |
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Anti-dive
I covered anti squat and the as-engineered state of the s14. Now it's time to take a look at the other end of the car. Anti-dive is just anit-squat turned around backwards. It's calculated pretty much the same way. But for a Mac Strut car like ours with no upper control arm, the instant center is created by the intersection of the line through the lower control arm and a line perpindicular to the the top of the strut.
More caster will get you more anti dive, but very slowly. But even small changes in the FLCA mount (up), or the tension rod (down), will quickly get you more anti squat. A refresher on on calculating anti dive/squat My calcs show the stock s14 with 14.8% anti-dive. My sources say that 20-25% is ideal. For the calcs I used a ground clearance of 3.2", a CG height of 10.65", with 52% front weight bias, and 7 degrees of caster. Moving the FLCA mount up 0.665" should get you upto 25%. It's also good for the roll couple.
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06-10-2011, 12:23 AM | #385 |
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Roll couple, the real skinny.
I finally got a chance to play with some suspension software! It's performance trends roll center program. All the measurements came off my s14. I used a ride height of 3.125" from the ground to the bottom of the crossmember. And my LSx crank centerline as the CG height came out to 10.625" above ground. All measuremens also presume 3 degrees of static camber.
Ideal camber curves have about 1 degree of camber gain per degree of roll. The senarios I plotted varied from 0.45 - 0.63 degrees of camber gain. Such is the strut... Just from visualizing the geometry in my head I expected the set ups with roll center correction to have better and better camber gain as the FLCA angle further down towards the ball joint. This isn't the case! Improving the roll center, hurts camber gain, but not much. Who new? Before we can get to the nitty gritty of roll couple we need to talk about ball joints. I found this totally sweet pic in the roll center thread. From the pic I extrapolated that the stock ball joint is about 1.5". The whiteline and moonface pieces go for around $270, while the stockers (only 0.69" shorter) go for only $27! And here's an example of goin all hardcore with the ball joints. But notice that even after all this there's no more correction than the moonface offers. Looks a bit over two inches of from the ball joint articulation to mount. Of course with this kind of set up you can go bigger. But would you want to? Those bolts in single shear start to look real scary real fast. So here's what it looks like without any correction: OPTION 1 roll center 1.5" below ground With a ball joint that is >2" long: OPTION 2 you reduce the roll couple by 1.5" (or 14%), and at least the roll center is level with the ground Now if you cut off the bottom of the spindle, and weld in a big block of steel (2.35" tall) above the ball joint spindle taper/mount, you'll get a lot more correction than the 0.69" that expensive ball joints buys you. A 275/40/17 tire has a 4" all side wall, in the below calc this 2.35" "inner-spindle spacer" puts the articulation at only 5.4" above the ground. This will be damn close to scraping the bottom of your inner wheel! This Driftworks Geomaster front spindle only has 1.97" or roll center adjustment built in and already looks damy close to these wheels! Surprisingly raising the chassis mounting point for the FLCA doesn't do much. But in the following calc it's raised 0.66" just for Anti-Dive. With these two mods here's what you'll get: OPTION 3 A roll center height of 4.7" above the ground! Thats a roll couple that's been decreased from 12.125 to 5.925, for a roll couple that's only 48% of OPTION 1. With this final set up: 3.6 degrees of chassis roll only moves the roll center down one inch. Dynamically the only way to get a negative roll couple is to have the front of the car come up >2.7" from static ride height like a wheelie. Honestly I wouldn't mind decreasing the roll couple even more, but I just don't think it's feasable without messing with the Kingpin angle, and that would take so much work that you're better off picking a different chassis or going double a-arm. And just for shits and giggles. OPTION 4. If you really want the highest roll center, don't change anything! It looks like a stock 240sx with a (STOCK???) ride height of 6" ground clearance has the roll center 5.7" above ground. But of course it also has a center of gravity 3" higher, and a roll couple (what this is really all about) 2" worse than OPTION 3.
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06-10-2011, 06:40 AM | #386 |
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Looks like you have some extremely thorough information in here! I can tell you with my ball joint set up there is room up front to space it down another 10mm, but the LCA would likely start rubbing the brake rotor. I already had to grind my LCAs down to prevent rubbing. This leaves me to believe there is no way the moonface ones adjust as much as mine, unless they come with instructions telling you to grind your LCA down. I can get some better measurements if you like - it'll just have to be when my car is back at my house.
The GP Sports Hyper Knuckles have this diagram: Looks like they actually shifted the ball joint location out, which is something to take into consideration if you plan on welding the ball joint mounting location down on the knuckle. Also, about weight, my car completely gutted, caged, 17X10/11, stock bumper bars, stock hood, CF trunk, full exhaust and braille battery mounted under the dash came out to almost exactly 2700 with me out of the car. Now I have a much lighter front bumper support and a CF hood, so I am curious to see how much weight that knocked off.
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06-10-2011, 10:01 AM | #387 |
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Knoop,
2700 with cage and our stock depleted uranium hood!? That's awesome to hear. And your new paint looks epic, I have to be honest, I never expected the fenders to turn out that bitchin. Cutting the inner rear fender-well in back, and trailer fenders in front was brilliant! How much weight did you save with your custom front bumper? I was checking out the stock front bumper, and was wondering how much wieght could really be saved? Re. the ball joints. I think that the moonface articulation point is is almost a full inch higher compared your custom/adjustable ball joints in relation to the top of the FLCA. Which probably robs some Megan on left LOL. Stock on right, with articulation point above FLCA. Knoops sweet custom set-up, with articulation point level with FLCA top.
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06-10-2011, 11:49 AM | #388 |
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Fantastic visualizations on CG, roll center, and roll couple. I'm currently going through all the measurements for my FD with Performance Trends Suspension Analyzer, and not missing strut front suspension at all lol.
You thinking of doing the cut/add block of steel/reweld method?
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06-10-2011, 12:08 PM | #389 | |
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Quote:
I'm seriously thinking about it. It might be easier and lighter to copy Knoop's design, but I need to double check the failure and fatigue point of the taper/ball joint and tie rod. Those long rods make me nervous, and stock ball joints plus a block of steel are a good bit cheaper than the giant bearing and races he used. The results are the same either way though. Have you measured the FDs actual CG yet?
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06-10-2011, 03:15 PM | #390 |
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Thank you for the complements, I am floored with how the paint turned out. Now I just have to keep bugging the shop about my damn aero!!
As far as weight savings goes on my bumper bar, I am not entirely sure as I didn't weigh the original. However, the original one was noticeably heavier then the one I have now. I can hold my new one with both hands and shake it back and fourth pretty fast. I'd say it saved at least 10lbs....and it looks cool as shit, hahaha! I am really curious to see how much weight I saved with the hood. I didn't think the stock hood was all that heavy, I could pick it up and move it around by myself, but the CF one is definitely lighter, hopefully I saved around 10lbs there too. Also, I believe it was about 350ish to do all four LCAs with the ball joint mod. The shank I am using is for circle track cars, so I'd assume they're made to take some abuse! The part that goes through the spherical bearing is 5/8", so the tapered section is thicker then that, and I am using 3/4" spherical bearings that have a decent load rating and aren't expensive at all. The shanks are the most expensive pieces, at $20 a piece. If you were to run a 1" bearing with 3/4" reducers and a grade 8 3/4" bolt + some decent metal tubing as a spacer you could space it down even more then I have it and have it be even stronger.
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