urbandekay

urbandekay

Active Member
Why are Defender bumpers constructed in such a way, I mean with box section inside the channel and squares of plates welded in?

all the best urban
 
urbandekay said:
Why are Defender bumpers constructed in such a way, I mean with box section inside the channel and squares of plates welded in?

all the best urban
Click to expand...

so they don't crush and distort when towing. & because they are designed to take lots of abuse off braindead squaddies who can't drive to save their lives.
 
They look fine to me.
A breath of fresh air from the plastic fantastic bumpers on so-called modern vehicles which fall to bits in an accident...
 
urbandekay said:

Well box or channel or tube but why box section welded inside channel or a slightly larger size with plate in the gap

all the best urban
Click to expand...

Because open channel offers very limited resistance to torsional loading (been twisted) So the centre section is reinforced with plates. Yu've put bumpers? But I'm assuming ya actually on about rear crossmembers??
 
redhand said:
Because open channel offers very limited resistance to torsional loading (been twisted) So the centre section is reinforced with plates. Yu've put bumpers? But I'm assuming ya actually on about rear crossmembers??
Click to expand...

Strange, bumpers what I said and bumper is what I meant, front bumper if that is clearer

all the best urban

 
redhand said:
Because open channel offers very limited resistance to torsional loading (been twisted) So the centre section is reinforced with plates. Yu've put bumpers? But I'm assuming ya actually on about rear crossmembers??
Click to expand...

Then why not make it all out of box, cheaper, lighter

all the best urban
 
I've had a similar thought for the front and back bumper/crossmember, they are both made out fairly light weight metal and neither are meant for serious towing or pulling. I'm looking for a chunky bit of boxed section for the back crossmember and will get a much deeper boxed section for the front bumper with a thought of cutting a slot with rollers fitted for the future winch.
I think everyone will agree the bog standard bumpers and rear crossmembers are not meant for heavy duty towing.
ALAN
Sheffield S25
 
Cor blimey this is a nice old thread. I would imagine that if you made your front bumper too strong it would only take a slight knock to bend your chassis. As it is the bumper gives way and saves you an awful lot of stress and money.
 
jimmy62alan said:
I think everyone will agree the bog standard bumpers and rear crossmembers are not meant for heavy duty towing.
ALAN
Sheffield S25
Click to expand...

Maybe the MOD ones are different, but my 110 is reinforced behind the crossmember at the hitch.

Also, the front bumper on mine is built for towing (has a tow pin in the centre), but it's not suitable for recovery situations.
 
A guy called press brake, on here, does fantastic rear cross members, 6mm steel very well made.
Quite a few peeps on here have em and swear by em. Had mine a couple of years now, got it galved at work and is solid.
 
If you make the front bumper too strong, it will transfer load to the chassis in a minor collision.

I'd rather have a bent bumper than a bent front chassis section!
 
Having recently backed into a tree and bent the rear crossmember ( quite easily ) I can say I'd prefer the bend in the cm, the tree wasn't going to bend! Towing's never been a problem with that design!
 
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