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Re: Front Steer Rack Conversion - Part Deux
[Re: ]
#1579446
02/16/14 03:23 PM
02/16/14 03:23 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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IMO, yes and no, In the area a gusset is suggested I don't see a stress concentration, relative to the rest of his design, and therefore adding a gusset would only make another area more prone to flexing and stress concentration issues, it looks to me well balanced in this concern, sure he could add stuff all over it, with the added weight. Bottom line much better execution. I would like to know however how beefy his mounting holes are 3" sides on the 2x3's.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Front Steer Rack Conversion - Part Deux
[Re: STEFF]
#1579450
02/16/14 07:39 PM
02/16/14 07:39 PM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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What does it weight? What control arms are you going to use?
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: Front Steer Rack Conversion - Part Deux
[Re: sshemi]
#1579451
02/16/14 07:46 PM
02/16/14 07:46 PM
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
STEFF
OP
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OP
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
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Thanx all for the positive feedback! It's much appreciated! Here's the answers to a bunch of the questions. I designed the k-frame in Solidworks 3D software. It was designed to use the stock lower control arms and strut rod arrangement with a strut rod using a heim end at the front. I plan to get rid of the t-bars and go to coilovers, once I get the shock area reinforced. All of the round tubing is 4130 moly: 1 1/2 dia x .120 wall for the 3 main tubes and 1" x .083 wall for all of the other pieces. Rect. tubing is 2 x 3 x 1/8 wall mild steel and Sq. tubing is 2" x 1/8 wall mild steel. Mounting holes are reinforced with Grade 8, 1/2 flat washers, that are 1 3/4 dia. by about an 1/8" thick. I built it on a jig. This is one of the only build pic I have.  Weight is 28 lbs bare. I wanted to make sure this thing could handle a pot hole as it is going on a street/strip car. So a few extra pounds wasn't a big deal. It's still alot lighter than the stock frame. I think the stock k-frame was around 40 lbs. And for reference, the Pinto Rack weighs 12 lbs. A stock manual gear box with the steering arm, drag link, tie rod ends, and idler arm weighs 28 lbs. So, 40 lbs for the new K-frame and rack vs. 68 lbs for the stock stuff. I got it into the car and it's fits like a glove. I'm really pleased. Here are a few pics of it installed.     
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Re: Front Steer Rack Conversion - Part Deux
[Re: Stanton]
#1579452
02/16/14 07:54 PM
02/16/14 07:54 PM
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
STEFF
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OP
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Joined: Jan 2003
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Smyrna, South Carolina
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Quote:
How does this thing compare height-wise to a stock k-member. Judging by the position of the strut mounts relative to the bottom it looks like it would hang a couple inched lower than a stock k-member.
Stock K-frame from mtg. face to bottom is 7". My new K-frame from mtg. face to bottom is 7 3/16", so, 3/16 difference. The lower control arm location and strut rod intersect point at front (centerline of bolt for heim) is in the stock location.
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Re: Front Steer Rack Conversion - Part Deux
[Re: Stanton]
#1579453
02/16/14 07:56 PM
02/16/14 07:56 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Quote:
If he used a washer on his bolts they'd be as beefy as any stock k-member! Hell, those things are only two layers of sheetmetal !!
I strongly disagree. They are not an open span of 2.75"of 1/8" sheetmetal like the OP's. They are closely gusseted as possible, and welded, granted not well. I think the OP at least, for all his other efforts here, should insure this bolted conection, almost the most single point that chassis forces are channeled thru, does not flex. I will later post a close up of the OEM area, but am sure most are familiar with it anyway. 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Front Steer Rack Conversion - Part Deux
[Re: mshred]
#1579456
02/16/14 09:16 PM
02/16/14 09:16 PM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Looks good, why the heim joint on the steering shaft?
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: Front Steer Rack Conversion - Part Deux
[Re: 1967dartgt]
#1579459
02/16/14 10:17 PM
02/16/14 10:17 PM
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
STEFF
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
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Quote:
Looks good, why the heim joint on the steering shaft?
The inner steering g shaft isn't supported, coming out of the column. It was either make a bushing to insert into the end of the column or add a Heim. I opted for the heim.
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Re: Front Steer Rack Conversion - Part Deux
[Re: Stanton]
#1579460
02/16/14 11:11 PM
02/16/14 11:11 PM
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
STEFF
OP
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OP
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
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Quote:
What body style is that built for, a or b/e ?
Post more pics when its all hooked up please.
Built for my 70 Road Runner.
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Re: Front Steer Rack Conversion - Part Deux
[Re: MR_P_BODY]
#1579462
02/17/14 01:14 AM
02/17/14 01:14 AM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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My recollection is flawed. I have been lately working on my RMS K, and it has a 1.75 opening in K member attaching bolt tube. Below is a 2x3tube next to I believe a typical OEM K. The opening measurers 2.72" in rear and 2.39" in front. OP's front with 2" sq tube is a smaller area. However very importantly there is on all attaching bolt areas a third vertical gusset, 1" from bolt hole center on the third side, and provides most of the mounting surface reinforcement. The pictured OEM flange thickness is .285", with dirt/rust.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Front Steer Rack Conversion - Part Deux
[Re: jcc]
#1579463
02/17/14 12:04 PM
02/17/14 12:04 PM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Quote:
My recollection is flawed. I have been lately working on my RMS K, and it has a 1.75 opening in K member attaching bolt tube. Below is a 2x3tube next to I believe a typical OEM K. The opening measurers 2.72" in rear and 2.39" in front. OP's front with 2" sq tube is a smaller area. However very importantly there is on all attaching bolt areas a third vertical gusset, 1" from bolt hole center on the third side, and provides most of the mounting surface reinforcement. The pictured OEM flange thickness is .285", with dirt/rust.
So a factory is a little more then twice as thick in mounting flange then a 1/8 box tube.
Last edited by 1967DartGT; 02/17/14 12:06 PM.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: Front Steer Rack Conversion - Part Deux
[Re: 1967dartgt]
#1579465
02/17/14 12:54 PM
02/17/14 12:54 PM
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
STEFF
OP
master
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OP
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Joined: Jan 2003
Posts: 3,874
Smyrna, South Carolina
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Quote:
Quote:
My recollection is flawed. I have been lately working on my RMS K, and it has a 1.75 opening in K member attaching bolt tube. Below is a 2x3tube next to I believe a typical OEM K. The opening measurers 2.72" in rear and 2.39" in front. OP's front with 2" sq tube is a smaller area. However very importantly there is on all attaching bolt areas a third vertical gusset, 1" from bolt hole center on the third side, and provides most of the mounting surface reinforcement. The pictured OEM flange thickness is .285", with dirt/rust.
So a factory is a little more then twice as thick in mounting flange then a 1/8 box tube.
There is an extra L-shaped piece welded in the hole area. The total of the main plate thickness and extra L-shaped piece make up the approx 1/4" thickness.
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