Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

40 Pages V « < 8 9 10 11 12 > »   
 Reply to this topicStart new topic
> 914RS4 Tube Chassis 996 Suspension Audi 2.7TT Stage 3, ADDED RECAROS
Andyrew
post Oct 24 2016, 12:30 PM
Post #181


Spooling.... Please wait
**********

Group: Members
Posts: 13,376
Joined: 20-January 03
From: Riverbank, Ca
Member No.: 172
Region Association: Northern California
I just did a roll hoop for a Miata and used 1/2" conduit to form the outer edge of the hoop.. Might be cheaper to grab some conduit than messing up that nice DOM?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914forme
post Oct 24 2016, 12:36 PM
Post #182


Times a wastin', get wrenchin'!
****

Group: Members
Posts: 3,896
Joined: 24-July 04
From: Dayton, Ohio
Member No.: 2,388
Region Association: None
Andrew, so you used the conduit to make a test piece? I'm a bit confused by your statement.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Andyrew
post Oct 24 2016, 01:37 PM
Post #183


Spooling.... Please wait
**********

Group: Members
Posts: 13,376
Joined: 20-January 03
From: Riverbank, Ca
Member No.: 172
Region Association: Northern California
QUOTE(914forme @ Oct 24 2016, 11:36 AM) *

Andrew, so you used the conduit to make a test piece? I'm a bit confused by your statement.

Yes, sorry. Conduit for test piece, then .120 wall DOM tubing for the actual hoop. I can see your confusion (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914forme
post Oct 24 2016, 04:13 PM
Post #184


Times a wastin', get wrenchin'!
****

Group: Members
Posts: 3,896
Joined: 24-July 04
From: Dayton, Ohio
Member No.: 2,388
Region Association: None
Makes perfect sense now.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 24 2016, 04:50 PM
Post #185


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
QUOTE(tygaboy @ Oct 24 2016, 09:01 AM) *

The cage is looking great! I know what you mean about "measure, bend, try again."
I'm sure you're on top of this but the critical factor for me seems to be ensuring the tube doesn't creep as the bend starts. Well, that and being sure I'm bending the correct end of the tube! (Ask me how I know...)

Keep up the great work (IMG:style_emoticons/default/aktion035.gif) and lots of pics.
I need a regular fix!


Thanks for the compliment. I'm using the JD2 model 32 bender and tube creep was never an issue. Do you have something other than a JD2 bender.


QUOTE(jd74914 @ Oct 24 2016, 09:24 AM) *

That cage is looking awesome Rudy! (IMG:style_emoticons/default/biggrin.gif) Are you using a JD2 bender?

Since you're MIG welding it might not help too much, but it has helped me while TIG welding so I thought I'd share...Apologies in advance if you've heard this before, etc. (IMG:style_emoticons/default/smile.gif)

If you drill a small hole at each tube junction so the whole cage is one single volume, you can back purge and the quality of the welds is much nicer. Even without purging, the holes let any of the smoke from oil in the tubes move so you don't get any blowouts from pressure buildup while heating and the welds tend to be cleaner.


Hey Jim....yes JD2 model 32. That's good advice on the back purging. I will save that for when I do the headers. Yes you're right I'm MIG welding the frame so no back purging required.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 24 2016, 04:56 PM
Post #186


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
QUOTE(Andyrew @ Oct 24 2016, 11:30 AM) *

I just did a roll hoop for a Miata and used 1/2" conduit to form the outer edge of the hoop.. Might be cheaper to grab some conduit than messing up that nice DOM?


Yes that is a good suggestion. I ruined 2 hoops (the rear "easy one")l, but I just need to cut the bends off and then I have material for the webs. But yes after I ruined two hoops I learned the error of my ways and was able to do the A pillar hoop in one try. If you notice the A pillar hoop is complex in that it has an offset bend and it also has a slight arch that follows the roof line. That arch is not in the plane of the windshield it is twisted about 47 degrees from the plane of the windshield. It was tricky but I did it and am satisfied with the result.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914forme
post Oct 24 2016, 06:49 PM
Post #187


Times a wastin', get wrenchin'!
****

Group: Members
Posts: 3,896
Joined: 24-July 04
From: Dayton, Ohio
Member No.: 2,388
Region Association: None
I was always taught to drill tubes when welding, otherwise you run the risk of making it a pressurized vessel and it may blow out. Molten Metal is not a fun shower. (IMG:style_emoticons/default/sad.gif)

Do you guys back purge more than just Stainless (IMG:style_emoticons/default/confused24.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jd74914
post Oct 24 2016, 08:07 PM
Post #188


Its alive
****

Group: Members
Posts: 4,779
Joined: 16-February 04
From: CT
Member No.: 1,659
Region Association: North East States
QUOTE(914forme @ Oct 24 2016, 07:49 PM) *

I was always taught to drill tubes when welding, otherwise you run the risk of making it a pressurized vessel and it may blow out. Molten Metal is not a fun shower. (IMG:style_emoticons/default/sad.gif)

Do you guys back purge more than just Stainless (IMG:style_emoticons/default/confused24.gif)


Here are my rules for back purging from the old school welders I used to work with (these were aircraft welders who only wire brushed in one direction, degrease before and after brushing, etc.):

- 100% of the time if TIG welding carbon steel, stainless, or titanium tubing (just as you would if welding piping or pressure vessels).
- No back purging for aluminum tubing
- Typically no back purging for MIG welding, though it does help on thin tubing. If someone else is paying for the gas absolutely back purge. (IMG:style_emoticons/default/laugh.gif)

Sorry for the hijack Rudy. (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 25 2016, 03:42 PM
Post #189


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
No highjacking just good information for those that are following the thread. And yes, I agree no need to backpurge for mig on mild steel. Also, I have never heard of the situation where the tube becomes a pressure vessel? Wow that is amazing and I am having a hard time believing it. One would think that the conditions for it would have to be a one in a million. It's possible but not probable, practically speaking.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jd74914
post Oct 25 2016, 09:29 PM
Post #190


Its alive
****

Group: Members
Posts: 4,779
Joined: 16-February 04
From: CT
Member No.: 1,659
Region Association: North East States
While certainly not pressure vessel grade, I've had melt blowout problems with smaller sealed tubes while TIGing. We're talking about 1" tubing of about a foot or little longer length. While not dangerous it's certainly inconvenient.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 26 2016, 07:39 PM
Post #191


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
Well completed trussing the long on the right side. Material is all cut for the left side....that is next. I love the look that it's getting. I also removed the center tunnel. That is going to get some extra special treatment (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) . It will add tremendous stiffness to the chassis.


Attached thumbnail(s)
Attached Image

Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
csdilligaf
post Oct 27 2016, 07:16 AM
Post #192


Member
**

Group: Members
Posts: 106
Joined: 18-April 12
From: San Diego CA
Member No.: 14,397
Region Association: None
Nice and tight tube notching and fitment you did there Rudy. That should really stiffen things up.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 30 2016, 09:24 PM
Post #193


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
Ok finished other side. Next step is to tie front and rears to new strut towers. Ohhhh...I'm lengthening wheelbase by 2 inches


Attached thumbnail(s)
Attached Image Attached Image Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 30 2016, 09:27 PM
Post #194


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
While adding long reinforcement I noticed this stress crack in the long.


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
MichiganMat
post Oct 31 2016, 04:46 AM
Post #195


Member
**

Group: Members
Posts: 114
Joined: 14-June 06
From: San Jose, CA
Member No.: 6,222
Region Association: Northern California
Whats your thinking behind the placement of those upper bars connecting the front and rear hoops?

Im concerned that they are placed too far inward which could put them directly over the drivers head instead of off to the side. Is there a reason you haven't placed them off to the corners? Theres not a lot of headroom for drivers & passengers as it is in these cars, you might consider putting them as far off to the corners as possible.

Loving the build so far, keep the pictures coming!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Andyrew
post Oct 31 2016, 07:11 AM
Post #196


Spooling.... Please wait
**********

Group: Members
Posts: 13,376
Joined: 20-January 03
From: Riverbank, Ca
Member No.: 172
Region Association: Northern California
QUOTE(Curbandgutter @ Oct 30 2016, 08:24 PM) *

Ok finished other side. Next step is to tie front and rears to new strut towers. Ohhhh...I'm lengthening wheelbase by 2 inches



2 inch wheelbase lengthening? That would be awesome.. That would really increase the stability at your power level. (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Oct 31 2016, 03:01 PM
Post #197


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
QUOTE(MichiganMat @ Oct 31 2016, 03:46 AM) *

Whats your thinking behind the placement of those upper bars connecting the front and rear hoops?


Good eye Michigan! Actually they are place holders for right now. I will only add them if the twist test shows an appreciable improvement in torsional stiffness.


QUOTE(Andyrew @ Oct 31 2016, 06:11 AM) *

QUOTE(Curbandgutter @ Oct 30 2016, 08:24 PM) *

Ohhhh...I'm lengthening wheelbase by 2 inches



2 inch wheelbase lengthening? That would be awesome.. That would really increase the stability at your power level. (IMG:style_emoticons/default/smile.gif)


Yes, the lengthening came about from thinking how this would give me a better straight line stability. Two inches is a number that I can sneak in and still look like a regular teener. This gives me more room in the engine compartment and allows the cv axles to line up better with the transaxle.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cracker
post Oct 31 2016, 07:27 PM
Post #198


Advanced Member
****

Group: Members
Posts: 2,148
Joined: 2-February 10
From: Atlanta (area)
Member No.: 11,316
Region Association: South East States
That would be wonderful...my drive flange to hub centerline is 2.6" - a 2" increase would be ideal. With a little massaging - I will be able to retrieve about 1". Jealous.

T

QUOTE(Curbandgutter @ Oct 31 2016, 05:01 PM) *

This gives me more room in the engine compartment and allows the cv axles to line up better with the transaxle.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
76-914
post Oct 31 2016, 07:33 PM
Post #199


Repeat Offender & Resident Subaru Antagonist
**********

Group: Members
Posts: 13,491
Joined: 23-January 09
From: Temecula, CA
Member No.: 9,964
Region Association: Southern California
You gonna tell 'em about the other 2" mod or is that classified? (IMG:style_emoticons/default/beerchug.gif) Kent
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Curbandgutter
post Nov 1 2016, 11:03 AM
Post #200


Senior Member
***

Group: Members
Posts: 564
Joined: 8-March 13
From: Murrieta CA
Member No.: 15,637
Region Association: Southern California
QUOTE(76-914 @ Oct 31 2016, 06:33 PM) *

You gonna tell 'em about the other 2" mod or is that classified? (IMG:style_emoticons/default/beerchug.gif) Kent


That i s"HIGHLY" classified (IMG:style_emoticons/default/stirthepot.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

40 Pages V « < 8 9 10 11 12 > » 
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 26th April 2024 - 06:47 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...