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 2Likes
06-06-2008, 03:32 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
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06-06-2008, 03:35 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
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06-06-2008, 03:36 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Here you can see we ran a rib all the way down to the other side of the cross brace so the seat belt pulls on both sides of the cross brace in the unfortunate event it is ever called upon to be used.
Last edited by David Kirkham; 06-06-2008 at 03:52 PM..
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06-06-2008, 03:38 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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In this shot you can see we billeted the seat belt mounting point directly into the cross brace.
Last edited by David Kirkham; 06-06-2008 at 03:53 PM..
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06-06-2008, 03:40 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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I will post more pics as I find them. The latest thinking is we will test drive sometime late next week. I certainly hope so.
David
Last edited by David Kirkham; 06-06-2008 at 03:54 PM..
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06-06-2008, 03:50 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Quote:
Originally Posted by Three Peaks
Does anyone think that it is an accident that the coupe is in the background of that last picture?
Bob |
No accident. It just hangs around until we can get around to making it!
David
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06-06-2008, 03:53 PM
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CC Member
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Join Date: Jan 2005
Location: Hillsboro,
OR
Cobra Make, Engine: Scratch built CSX style frame, Carbon fiber body, 393 Stroker, T-bird IRS, T5
Posts: 1,623
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Not Ranked
I thought just maybe you were fitting it up to this chassis so it would be ready for the "next one".....
Bob
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06-06-2008, 04:18 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Not Ranked
Quote:
Originally Posted by RedBarchetta
Keep teasing us like this and the next time you go into your office someone will have installed a brass pole.  |
Funny you mention that--I'm working on a billet one right now...
David
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06-06-2008, 04:33 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Quote:
Originally Posted by Three Peaks
I thought just maybe you were fitting it up to this chassis so it would be ready for the "next one".....
Bob
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No, the next one has nothing to do with Cobras, Shelby, Hot Rods, or the 60's. It is a jewel for this century.
David
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06-06-2008, 05:20 PM
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CC Member
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Join Date: Mar 2004
Cobra Make, Engine: spf 2112 *427 stroker windsor
Posts: 333
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Great Job David. True toolmaker wookmanship. Are you going to leave the cutter marks or polish them out. I think it looks good leaving the cutter marks.
Carmine.
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06-06-2008, 05:23 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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carmine,
Thanks for the kind words!
On the control arms we will probably polish them to a mirror finish. But, I agree, I think the tool paths look pretty cool too.
David
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06-06-2008, 05:27 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
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Believe it or not, on Wednesday, we took the entire chassis apart to clean in inside and out. We had to get the tapping oil out of the holes so the Loctite would stick.
Last edited by David Kirkham; 06-06-2008 at 05:47 PM..
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06-06-2008, 05:29 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
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Here are all the parts taken back off again.
Last edited by David Kirkham; 06-06-2008 at 05:47 PM..
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06-06-2008, 05:32 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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One of the main rails coming in from the pressure washer.
Last edited by David Kirkham; 06-06-2008 at 05:48 PM..
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06-06-2008, 05:34 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
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This is a really cool part. This is one of the push rod rockers. If you look very closely, we use bearings for the rocker to pivot on. WE DO NOT PIVOT ON BOLTS!!!
Last edited by David Kirkham; 06-06-2008 at 05:48 PM..
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06-06-2008, 05:36 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
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See the little bushings on the inside of the cut out of the rocker. Those bushings ride on the bearing race on the outside and on the chassis on the inside. The bolt then goes through the assembly and bolts the bearing race solidly to the chassis. That way when the rocker pivots, it pivots on the bearing and NOT on the bolt. Pivoting on a bolt is very, very bad as the bolt will eventually wear out and then you will get to go for a fun ride as your suspension falls off. 
Last edited by David Kirkham; 06-06-2008 at 05:53 PM..
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06-06-2008, 05:37 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
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Hopefully this is a better shot.
Last edited by David Kirkham; 06-06-2008 at 05:53 PM..
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06-06-2008, 05:55 PM
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Here are the differential side axles. Notice they are set up for CV joints. They are made out of 17-4 as well.
The original 427 Cobra had plunging 1/2 shafts which bound up seriously if you accelerated out of a corner while the suspension was still loaded. CV's were invented to solve that problem.
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06-06-2008, 06:10 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Today Sandwich fitted the 1/2 shaft axles to the car. This is how you do it. You take a Porsche axle, cut it, put a sleeve over it and then fit it to the CV joints. You then hold the suspension at ride height and adjust the length of the axle so that the CV joints are 1/2 way through their plunge ON BOTH CV JOINTS!!! Tack weld. Rotate the hub to make sure nothing is binding AT FULL DROOP AND AT FULL BUMP. Measure the axle. Then MAKE IT! YEA!!! (But, just to be sure, you need to make it out of aluminum first )
Last edited by David Kirkham; 06-06-2008 at 06:15 PM..
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06-06-2008, 06:13 PM
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CC Member
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Join Date: Mar 2001
Location: Provo,
Ut
Cobra Make, Engine: Kirkham, 427
Posts: 6,990
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Then on to the good stuff...17-4 PH.
First, you spline the ends of the shaft. We are really lucky because we have a 3 axis lathe that can do splines.
Then, you can see Sandwich made a special "driver" to drive the splined end of the axle. We turn the axle between centers then. You have to make the splines first to that you can take ANY non-concentricity out of the axle when you make it. By turning between centers, the shaft is made really concentric.
This is our war horse Haas CNC lathe. It has seen some very hard use over the years and it still holds 0.0002 inches. I am pretty impressed with it. So much so, I bought 4 of them! And several mills too.
Last edited by David Kirkham; 06-06-2008 at 06:16 PM..
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