924Board.org

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

I was thinking of changing the mounting of the front and back bumpers so they don't stick so far out of the car. Would there be any issues with doing this (any interference)? Right now the front is about 4 inches out which is too far IMO. I have not looked at the back, but "shortening" the bumper holders (shocks) is possible with those also?
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

Possible on front and back. Drill the shocks on the mounts, let the fluid drain, and then push the bumpers in.
_________________
1987 951 - M193 Version for Japan

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

Sounds easy. Once drilled and drained, then put a screw or bolt to hold bumper in? If the bumper can be pushed in, couldn't it work itself back out? I was thinking of making separate "new" brackets and taking off the shocks.
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

Rob: I've got a set of euro bumper mounts that you can look at, if that will help, to get some dimensions from providing they would work. Let me know and I'll bring them to the next meeting or you can pick them up from my place.
_________________
'80 924 n/a SOLD

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

Take out the mounts. Cut the material 1 in. behind the the mounting plate. Fluid will drain out. Push in the shock and take them to have them welded. Use the above. Cost? Only the welding. You supply the grunt.

I have all the parts for sale to convert the front and rear to Euro bumpers but that will cost you. The cheapest is to do what I recommended in the first paragraph.
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

How far do the euro bumpers stick out (so I know how much to shorten the shocks)? Right now my bumper is about 4 inches.
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

From memory the bolt holes are about 90mm or 3 1/2" out from the mounting panel.
IMO welding up the bumper shocks sounds sus on a ford let alone a porsche.
If you dont want to take the effort to chase up a couple of ROW brackets, that have no adjustment anyway, how about 2 short lengths of 1 1/4 square tube welded at 90 deg to a bit of 3 x 1/8 flat bar, with holes drilled to suit the 2 bolt holes. If U slot the bumper mounting holes in the RHS you have a stronger bracket with adjustment so it lines up as it should be.
Works well on mine

Roger

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

I replaced my bumpers with Euro ones (mounts as well). There is a good amount of weight to be saved at both ends of the car by swapping on Euro bumpers and mounts. The US bumper shocks are very heavy, and the US bumpers are heavier than the Euro fiberglass versions.
_________________
1987 951 - M193 Version for Japan

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

Cut the shortest, welded, bolted on with the bumper mine shows a 2 in length from the body to the outside of the bumper. I do not have any rubber on the rear bumper and only thin upright rubber on the front.
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Mike924 is correct in what he says. The ROW brackets are designed to crush and indeed they do. At any ipmact speed over about 10Km/hr this becomes insignificant though.
Had considered installing US style shocks wich I believe must provide frontal bumper compression at 10mph. They are actually safer if you have a crash in the driveway.
The euro bumper protudes 70mm (2 3/4") out from the nose, measured on the upper bumper face between the mounts. There may be slight variation however as I have slotted brackets and adjusted the bumper for consistant gaps at the adjoining panels.

Roger

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

The US bumper shocks would collapse if you hit them with a baseball bat. I had some idiot hit my car while they were backing up and hit my car. I had a bra on the car and did not notice that one side was pushed in. I took off the bra and it was off on that side. It was the slightest hit.

I do not think it matters if you have either mounts on.
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

So they collaps at over 10kph? Well, you could always hit a wall evenly at 11kph and botta bing!

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

If it was up to me I would buy a 50s car with steel bumper, 100 hp, stick shift in a hearbeat. Have you guys seen wrecks of modern cars. There is nothing left to it after a crash. Naturally I would put seat belts or a harness in it. Anybody have one.

In this time frame I owned a 50 4 door Studebaker and a 56 Studebaker Golden Hawk. The latter had a 352 cu. in. Packard engine in it. Go to the Studebaker Golden Hawk site and check out the two tone paint jobs they had. Mine was bottle green and white.
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock