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> Vintage racer build
jhelgesen
post May 20 2010, 06:35 AM
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We started cage work for a vintage racer 914-6...

Customer brought in a decent stripped tub, fitted for a complete fiberglass fender setup.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.1.jpg)

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.2.jpg)

We started in with the main hoop

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.3.jpg)

We'll be tying in all the suspension points.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358902.4.jpg)

Trial fit the door bars last night.

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274358903.5.jpg)
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JmuRiz
post May 20 2010, 09:07 AM
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Looks good, but damn, you have my wall stripe idea before I did mine...is it paint (if so, VERY nice) or a vinyl decal?
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jhelgesen
post May 20 2010, 09:10 AM
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QUOTE(JmuRiz @ May 20 2010, 11:07 AM) *

Looks good, but damn, you have my wall stripe idea before I did mine...is it paint (if so, VERY nice) or a vinyl decal?


Thanks. It is paint. 5 rolls of painters tape, 3 colors, and 5 nights of work.
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ChrisFoley
post May 20 2010, 11:24 AM
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I hope you're not welding the roll cage together with that little Lincoln in one of your pictures!
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jhelgesen
post May 20 2010, 11:34 AM
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QUOTE(Racer Chris @ May 20 2010, 01:24 PM) *

I hope you're not welding the roll cage together with that little Lincoln in one of your pictures!


Our equipment works just fine, more than enough amps.... (IMG:style_emoticons/default/biggrin.gif)

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274376857.1.jpg)

We just finished up this Acura TSX for the Continental Tire Challenge series

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274376857.2.jpg)

(IMG:http://www.914world.com/bbs2/uploads_offsite/i184.photobucket.com-9299-1274376857.3.jpg)
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jimkelly
post May 20 2010, 12:22 PM
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if you can - pls be descriptive on the install of the fiberglass fenders - photos would be nice too. i assume they get epoxied in place? i see you cut away a decent amount of sheetmetal near the near lights. (IMG:style_emoticons/default/popcorn[1].gif)
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quadracerx
post May 20 2010, 02:09 PM
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I was wondering about those fenders and how they attach too....
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carr914
post May 21 2010, 04:16 AM
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QUOTE(Racer Chris @ May 20 2010, 01:24 PM) *

I hope you're not welding the roll cage together with that little Lincoln in one of your pictures!


It says NASCAR on it, doesn't that mean it's good ? (IMG:style_emoticons/default/lol-2.gif)
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jhelgesen
post May 21 2010, 04:22 AM
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QUOTE(carr914 @ May 21 2010, 06:16 AM) *

QUOTE(Racer Chris @ May 20 2010, 01:24 PM) *

I hope you're not welding the roll cage together with that little Lincoln in one of your pictures!


It says NASCAR on it, doesn't that mean it's good ? (IMG:style_emoticons/default/lol-2.gif)

We have to weld in little circles only to the left with it...hehehe
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quadracerx
post Sep 20 2010, 09:59 PM
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Anyone have any suggestions on how to fasten these fenders properly?
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carr914
post Sep 21 2010, 04:37 AM
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The fact that it is a race car, I would think that they used DZus Fasteners
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scotty b
post Sep 21 2010, 05:22 AM
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QUOTE(carr914 @ Sep 21 2010, 02:37 AM) *

The fact that it is a race car, I would think that they used Zsus Fasteners



(IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/poke.gif) Dzus (IMG:style_emoticons/default/rolleyes.gif) (IMG:style_emoticons/default/laugh.gif)
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jhelgesen
post Sep 21 2010, 05:46 AM
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Quick release fasteners were not allowed by the sanctioning body, the panels were glued on with 3M panel adhesive. After several track events and some contact, the panels are still on and not going any where.
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carr914
post Sep 21 2010, 06:21 AM
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QUOTE(scotty b @ Sep 21 2010, 07:22 AM) *

QUOTE(carr914 @ Sep 21 2010, 02:37 AM) *

The fact that it is a race car, I would think that they used Zsus Fasteners



(IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/poke.gif) Dzus (IMG:style_emoticons/default/rolleyes.gif) (IMG:style_emoticons/default/laugh.gif)


I was just starting my 2nd favorite beverage (IMG:style_emoticons/default/morning1.gif)
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arkitect
post Sep 21 2010, 06:59 AM
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Keep the picts coming, want to see the process of connecting full fiberglass fenders.

Dave (IMG:style_emoticons/default/smile.gif)
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sean_v8_914
post Sep 21 2010, 08:01 AM
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OT: I was watching monster truck jam. Blue Thunder hit some jumps and both rear shock consoles came apart. then they showed the carnage...WTF? it all came apart at the welds. can someone with real welding experience explain that? I say cold joints and poor penetration.
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rick 918-S
post Sep 21 2010, 08:21 AM
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Hey nice rack! -Celette
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QUOTE(sean_v8_914 @ Sep 21 2010, 09:01 AM) *

OT: I was watching monster truck jam. Blue Thunder hit some jumps and both rear shock consoles came apart. then they showed the carnage...WTF? it all came apart at the welds. can someone with real welding experience explain that? I say cold joints and poor penetration.


If it was 4130 it is likely poor penetration. (monster trucks likely would use light 4130) The other problem with welding 4130 is the rate of cooling. Mig welding 4130 can result in a concentrated local heating of the tubes with a quick flash cooling. This will cause a brittle condition and lock in stress. IIRC Tig welding can even be worse as the heat concentration is even more concentrated with a faster cooling cycle. In welding body panel seams tig is ideal because of the small heating and your ability to concentrate the work to a smaller area minimizing the warp factor.
That's why experimental air frames are gas welded. The molecules expand slower with the torch and further down the tubes. The tubes hold heat longer after the welding process is completed. Cooling is slower allowing the tubes to naturalize (tube and weld metal) restoring the strength.

Mild steel DOM can be mig welded with great success. It's a little heavier.
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sean_v8_914
post Sep 21 2010, 09:58 AM
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does pre heating help?
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rick 918-S
post Sep 21 2010, 11:36 AM
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QUOTE(sean_v8_914 @ Sep 21 2010, 10:58 AM) *

does pre heating help?


Yes. No problemo. I'm note sure they still do this but NASCAR I think used to require the cages be placed in an oven after welding to be cycled up in heat and slow cooled to naturalize the cage. It doesn't take alot of heat I don't think. (can't remember all the little details it's been awhile..) But a rosebud with a low flame moving over and away from the joint several inches should accomplish a nice slow cooling cycle. IIRC it doesn't even have to be red or cherry, just heated and not overheated. There should be alot of info on the airframe builders forums. I always gas weld 4130. There is a specific filler rod for 4130. I have some in the garage. Can't remember the part number.

Sorry for the hi-jack (IMG:style_emoticons/default/wacko.gif) I tend to ramble. Hopefully some of this dribble will be useful.. (IMG:style_emoticons/default/smile.gif)
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msglaigaie
post Sep 21 2010, 11:46 AM
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I have the same fenders and I am very interested in how you cut and fitted. Share more photos please.
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