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> Backdating Bumpers, Hopefully the last thread ever written on the subject
bigkensteele
post Nov 25 2013, 01:23 PM
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QUOTE(boxstr @ Nov 25 2013, 09:43 AM) *

I have used the nutserts that you have pictured. Drilling a hole and then small pop rivets around the edge work great.
Not sure what special tool you are referring to?
Craig at CAMP

I was talking about these:
Attached Image

which requires this $80 - $120 tool to install:
Attached Image

Nice solution, but too rich for my blood.
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Eric_Shea
post Nov 25 2013, 04:05 PM
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Already added to the "Classics" (IMG:style_emoticons/default/thumb3d.gif)
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bigkensteele
post Nov 25 2013, 05:55 PM
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QUOTE(Eric_Shea @ Nov 25 2013, 02:05 PM) *

Already added to the "Classics" (IMG:style_emoticons/default/thumb3d.gif)

I am honored. Thanks!
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johannes
post Nov 26 2013, 05:54 AM
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Very well done tutorial. Thank you for sharing.
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dlee6204
post Nov 26 2013, 06:40 AM
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Nice write up! (IMG:style_emoticons/default/thumb3d.gif)
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maf914
post Nov 26 2013, 06:53 AM
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Very good write up. Thank you. And thanks to all who have posted to similar threads, showing their ideas and tips for backdating bumper installations.

I have a small question: What size spot weld drill bit works best for the spot welds in this situation? Thanks. (IMG:style_emoticons/default/idea.gif)
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69telecaster
post Nov 26 2013, 07:46 AM
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"While there are a few of us who like the looks of the late bumper (myself included, depending on the color of the car), there is one really good reason to go with early bumpers – weight. I have seen many figures thrown about, so I decided to weigh them both, including all mounting hardware, fog lights, grills, etc. I was quite surprised at just how much heavier the later bumpers are."

I agree about the car color...our '76 is black.
I was wondering if there's any way to simply lighten them, rather than backdate. (IMG:style_emoticons/default/idea.gif)

cm
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Chris H.
post Nov 26 2013, 08:29 AM
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QUOTE(69telecaster @ Nov 26 2013, 07:46 AM) *


I was wondering if there's any way to simply lighten them, rather than backdate. (IMG:style_emoticons/default/idea.gif)

cm


Yes, you could remove some of the material from the metal piece that is underneath the black plastic. It's where a lot of the weight is. I believe someone on the board has done this before.

I think a company (HPH?) used to make a fiberglass copy that was superlight...that might be cool.

edit: as noted below the shocks weigh a lot as well....just moved the box with mine in it...ow my back!!!
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mepstein
post Nov 26 2013, 09:20 AM
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QUOTE(Chris H. @ Nov 26 2013, 09:29 AM) *

QUOTE(69telecaster @ Nov 26 2013, 07:46 AM) *


I was wondering if there's any way to simply lighten them, rather than backdate. (IMG:style_emoticons/default/idea.gif)

cm


Yes, you could remove some of the material from the metal piece that is underneath the black plastic. It's a thick metal piece. I believe someone on the board has done this before.

I think a company (HPH?) used to make a fiberglass copy that was superlight...that might be cool.


Zack - Vacca rabbit - lightened his with a hole saw. I don't know what he did with the shock supports but I imagine you could make a lighter bracket to hold up the bumper.

Personally, I like the backdated look.
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ndfrigi
post Nov 26 2013, 09:23 AM
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Great Documentation!

God Bless you for sharing a detailed procedure!
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Dave_Darling
post Nov 26 2013, 12:40 PM
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IIRC, the late European cars used the black rubber covers, but had a simplified metal bracket holding them on rather than the shock absorbers. I think they were trapezoid-shaped? And would bend to absorb some impact. Probably somewhat lighter than the US version.

Someone replaced the metal support with a thinner aluminum one, which I'm sure saved some decent weight.

--DD
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andys
post Nov 26 2013, 01:14 PM
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See this thread for bumper mounting studs:

http://www.914world.com/bbs2/index.php?sho...2&hl=bumper

Andys
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bigkensteele
post Nov 26 2013, 04:20 PM
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QUOTE(maf914 @ Nov 26 2013, 04:53 AM) *

Very good write up. Thank you. And thanks to all who have posted to similar threads, showing their ideas and tips for backdating bumper installations.

I have a small question: What size spot weld drill bit works best for the spot welds in this situation? Thanks. (IMG:style_emoticons/default/idea.gif)

I ended up using a 3/8" cutter. It is more or less a flat faced bit with a pointed pilot in the center. I think it might be in one of the pictures above. I only paid $25 for this one (only (IMG:style_emoticons/default/blink.gif) ), but there are nice units that will not leave a hole. Jim Kelly has one pictured in his bumper thread. I couldn't find one locally and didn't want to wait for an online purchase.

http://www.914world.com/bbs2/index.php?s=&...t&p=1741754
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bigkensteele
post Nov 26 2013, 04:23 PM
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QUOTE(andys @ Nov 26 2013, 11:14 AM) *

See this thread for bumper mounting studs:

http://www.914world.com/bbs2/index.php?sho...2&hl=bumper

Andys

Nice, I might have to pick some of those up!
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1970 Neun vierzehn
post Nov 26 2013, 08:26 PM
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Nice work on the bumper backdate (upgrade?). As you noted, you lost some significant weight where it is the least wanted....and your car looks better for your efforts. BUT..........

.....now you have to update your avatar (IMG:style_emoticons/default/biggrin.gif)

Paul
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bigkensteele
post Nov 26 2013, 08:56 PM
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QUOTE(1970 Neun vierzehn @ Nov 26 2013, 06:26 PM) *

Nice work on the bumper backdate (upgrade?). As you noted, you lost some significant weight where it is the least wanted....and your car looks better for your efforts. BUT..........

.....now you have to update your avatar (IMG:style_emoticons/default/biggrin.gif)

Paul

Thanks for the (IMG:style_emoticons/default/slap.gif) Paul. I was thinking the same thing as I was posting it. Every time I added a new post to the thread, I would see the old look in the avatar, and I was thinking that I guess I should have unveiled a new pic along with the thread.

I will pick an interim until I get a good photo with valances.
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VaccaRabite
post Nov 27 2013, 07:01 PM
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QUOTE(mepstein @ Nov 26 2013, 10:20 AM) *

QUOTE(Chris H. @ Nov 26 2013, 09:29 AM) *

QUOTE(69telecaster @ Nov 26 2013, 07:46 AM) *


I was wondering if there's any way to simply lighten them, rather than backdate. (IMG:style_emoticons/default/idea.gif)

cm


Yes, you could remove some of the material from the metal piece that is underneath the black plastic. It's a thick metal piece. I believe someone on the board has done this before.

I think a company (HPH?) used to make a fiberglass copy that was superlight...that might be cool.


Zack - Vacca rabbit - lightened his with a hole saw. I don't know what he did with the shock supports but I imagine you could make a lighter bracket to hold up the bumper.

Personally, I like the backdated look.


Hole saw? Not enough setting-myself-on-fire potential.
I free handed it with a plasma cutter.
And yes, the sparks from the plasma cutter did set my pants on fire. That was interesting.

Doing this took a CONSIDERABLE amount of weight out of the front a rear bumpers. They weigh what the early stockers weight now. Just ditching the shocks saves about 25 pounds.

(IMG:http://www.914world.com/bbs2/uploads_offsite/farm4.staticflickr.com-1435-1385600511.1.jpg)

Zach
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Type 47
post Nov 27 2013, 11:19 PM
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OMG...had the body guy do all the cutting before painting....as you mentioned...not mentioned in the other thread was the top front cutting. DAMN i'm going to have to now cut off, per your instructions, my freshly painted chassis...

tremendous thanks for posting this...I was just slightly nervous about drilling the bolt/stud holes but now I know there is more work to be done.

you turned a potentially frustrating situation into a more logical process!!!

You also contributed something HUGE!! to this forum. When I 1st saw the post I said...oh yeah been there done that...but NO you had more complete info which showed that just doing a search might not always fully cover the subject.

Lesson learned...NEVER be concerned to post info about a subject that you might think has been covered before!

Again, for someone who is getting ready to hang back dated bumpers, your post to an "old" subject was GREATLY appreciated!
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colingreene
post Dec 5 2015, 05:36 PM
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just so anyone knows, i marked the holes as indicated and they did not line up with my bumper at all.
So check before you drill people.
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bigkensteele
post Dec 5 2015, 07:44 PM
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QUOTE(colingreene @ Dec 5 2015, 03:36 PM) *

just so anyone knows, i marked the holes as indicated and they did not line up with my bumper at all.
So check before you drill people.

I believe that I got the measurements from post 8 of the following thread:

http://www.914world.com/bbs2/index.php?sho...kdate++bumpers#

Craig at Camp 914 (boxstr) is also the guy who suggested using studs, so props to him.

How far off are they? I had to enlarge my holes a bit for some wiggle room, but mine fit great using those measurements.
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