Anonymous

DHC front bumper weights

The all purpose forum for any TR7/8 related topics.
troydeon
Rust Hunter
Posts: 164
Joined: 17 Feb 2013 23:28
Location: USA
Contact:

Postby troydeon » 27 Jun 2013 00:08

This link gives some interesting insight...
http://www.roush.com/Portals/1/Download ... VC-217.pdf

I've got some other projects to do first, but I think I am going to remove the weights. I've got a drooping front bumper as well...
I think that the 33 year old system probably isn't working as intended anyway and the idea of extra weight outside of the wheel base and in the front of the car bothers me...

I do like the spirited debate, and when I do get around to it I will post my subjective unprofessional opinion of the result....

Troy
1980 TR7 DHC
Image

Last TR
Swagester
Posts: 534
Joined: 20 Nov 2008 00:54
Location: USA
Contact:

Postby Last TR » 27 Jun 2013 04:07

Troy,

That's going to take some careful reading. Great stuff. I've always been a bit skeptical of the dampers, and figured on removing them when I ran out of other things to do. Might have to reconsider. This has been a very interesting discussion.

Ken Morton
Anchorage, Alaska
Image Image Image
1980 TR8, 1973 TR6, 1965 Volvo PV544, 1958 MGA, Jeep Cherokees

Orange Rag
Rust Hunter
Posts: 196
Joined: 23 Jul 2007 01:47
Location: Canada
Contact:

Postby Orange Rag » 27 Jun 2013 04:10

The drooping is commonly caused by the rubber supports that attach the bumper the to the frame are week or broken. They are a clever design but do fall apart with time.
Good article by the way, if you want to see cowl shake take a late 90's Chrysler convertible for a drive, it's unbelievable to watch the fenders wave back at you, it like a seesaw effect.
By the way when you take on this bumper project it's much easier with two people.
After you take off the bumper (easy part) you will need to remove the bumper skin to take off the weights, and depending on the condition of the nuts it may require an overnite saturation of wd40.
Good luck with your car.
Ron

Image

windy one
Swagester
Posts: 840
Joined: 27 Oct 2008 19:57
Location: USA
Contact:

Postby windy one » 27 Jun 2013 15:41

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Orange Rag</i>

I removed the weights, centre pin and rubber spacers.
Not only do I not notice a difference the bumper now fits tight to the body like on the coupe.
There's pictures posted resently under "Bumper swap FHC to DHC"
Again I can't tell the difference other than better looks! [<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Yup. My last TR8 was set up this way. Nicely tucked in look with no droop (think the PO used coupe frnt-bumper or frnt-bumper mounts).
Planned on doing the same to my current TR7 driver, but all the bolts (on my FHC parts car) were rusty and either snapped off or rounded out. [B)]

Johnny

Beans
TRemendous
Posts: 7795
Joined: 15 Mar 2006 19:29
Location: Netherlands
Contact:

Postby Beans » 27 Jun 2013 16:09

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by troydeon</i>

... I think that the 33 year old system probably isn't working as intended anyway and the idea of extra weight outside of the wheel base and in the front of the car bothers me...<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
Why are you thinking that and what's so bothering on the original set up?

<center>Image
<font color="blue"><i>1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)</font id="blue">
<b>[url="http://www.tr7beans.blogspot.com/"]<u><b><font size="3"><font color="red">My full Weblog</font id="red"></font id="size3"></b></u>[/url]</b></i></center>

Hasbeen
TRemendous
Posts: 6474
Joined: 28 Apr 2005 12:32
Location: Australia
Contact:

Postby Hasbeen » 27 Jun 2013 23:05

All the weight in the hugely heavy steel of the existing bumpers, designed by the US design rules, rather than Triumph, adds enormously to the inertias of the car. This is the case, whether continuing in a straight line, resisting turn in, or rotationally adding to the likelihood of loss of adhesion & spinning when turning.

Those design rules designed by a politician were never introduced, stopped by the US car makers lobby, but for Triumph, Honda, Fiat & a couple of others it was all too late. Cars were designed & in production. Triumph of course was too short of cash to change the design of both ends of the car.

Every designer tries to reduce the weight where possible, & the further it is from the center of gravity the worse it becomes, for the handling of the car.

Fortunately for most of us the package is quite good enough for us with our use of the car. Few want to achieve the ultimate handling the car could be capable of. 30 years ago however, I would have eliminated all that weight at the ends of any car I owned, & at the same time, improved the air supply to the cooling system.

Every design is a compromise, & most intelligent & experienced sporting car owners, with a bit of reading, can make changes to their cars, to make them better suit their requirements. That is why so many 7s are now sporting V8s & bigger brakes. Why some should think the body work is an act of god, I really can't imagine.

Hasbeen

FI Spyder
TRemendous
Posts: 8917
Joined: 03 Jul 2006 19:54
Location: Canada

Postby FI Spyder » 27 Jun 2013 23:50

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Hasbeen</i>

Why some should think the body work is an act of god, I really can't imagine.
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

<b>I do.</b> [:p]

Image

- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT
Image

Orange Rag
Rust Hunter
Posts: 196
Joined: 23 Jul 2007 01:47
Location: Canada
Contact:

Postby Orange Rag » 28 Jun 2013 00:41

Well put!

Image

Post Reply

Who is online

Users browsing this forum: No registered users and 202 guests

cron