I have a 75 280z and want to put the 240z bumpers on. I have all the things to do the conversion but don't know were to start. Is their anyone out there that has done this conversion.

I have never done this conversion but I do know there are 2 different types of 240 bumpers. They changed to a different mounting set-up for the '73 cars. The early ones (70-72) just used a flat piece of steel w/ a slight bend in it. The '73's used a set-up somewhat similar to the shock mounts used on the 260's and 280's.

You're best bet would be to try and use the '73 bumpers since the mounting would be similar.

I have also heard that just mounting up the bumper on the standard 280 shock mounts will result in the bumper sticking WAY far out away from the car. To get around this you will have to collapse the mounts. This will not allow your new bumper set-up to absorb small impacts.

Anyone else with info on this correct me if I'm wrong.

I have a question, even if you mount the 240 bumper up and

collapse the mounts isn't there still a big gap where the big 280 bumper used to be where the fender headlight bucket and valence meet? Would you have to change out those parts to get a true conversion?

Well the 240z and 280z bodys are the same. The Americans just wanted biger bumpers. God knows why... I dont see any problem, you'll just have to lightly placing the bumpers on to see if they fit coz u said u have everything and just want to know where to start :stupid:

Cheers

Chris Beattie

Maybe because it is a legal requirement?? In that situation the question makes sense.

Originally posted by datto_240z

Well the 240z and 280z bodys are the same. The Americans just wanted biger bumpers. God knows why... I dont see any problem,

The bumpers on 240Z's look great, I agree, but if you've ever been in a minor "fender-bender" with them you'll know that they fold up like cardboard. They provide virtually no protection to the bodywork. The larger and FUGLEY bumpers that began to appear on US market 1973 240Z's and continued to grow larger as years went on, have an energy absorbtion system that helps protect the bodywork MUCH better.

PS To install thew 240 bumpers on a 280Z, I'm told (2nd hand info) that you need to remove all of the old bumper mountings (not just "collapse" them) and use the mount brackets for the 240Z style bumper

How do you collapse the rear bumper shocks?

The method of installation is different for the front and rear bumpers.

Front:

Remove the front shock mounts and use the solid metal mounts from the 240 instead. They will bolt right up where the shock mounts used to and the bumper will fit exactly as it would on a 240. No wide gap.

Rear:

Yes you do have to collapse the shock mounts if you want to avoid a wide gap. To do this loosen the small screw in the middle of the bumper mounting plate of the shock mount. This is the hydraulic fluid fill point for the shocks. With the screw loosened give it a few whacks with a small sledge and the shock mount will collapse (and may well leak a little fluid). Retighten the screw when you have them collapsed.

Please note that the mounting bolts on the bumper will NOT line up with the holes in the shock mounts. You will have to use a piece of flat steel (about 1" wide by 1/4" thick) long enough to attach to both bumper shocks. Once you have it attached to the shocks line up the bumper (make sure that the gaps where the bumper attaches to the SIDES of the rear quarter panels are equal) and mark where the bumper attachment bolts meet the steel bar. Then drill appropriate sized holes in the steel bar, and you're ready to attach the bumper.

ALSO!! As Bambikiller240 points out, the 240 bumpers offer much less protection, especially with the shock mounts collapsed. Personally, however, I feel the improvement in looks is well worth the decrease in protection.

Cheers,

Peter

Michael's right. I knew I was forgetting something. :stupid:

If you don't change the front and side valences the new bumper won't fit or look right.

Cheers,

Peter

For the rear, could you also drop the tank and remove the bumper shocks all together? Maybe replace them with the 240Z bumper brackets? Or would you have to fabricate a bracket to put in place of the rear bumper shocks?

yah http://www.zcarcreations.com/howto/240bump.htm

Cool, too bad it's not a real step by step build, but I'll figure it out. Any idea which year small bumpers work/look the best?

I think the 280 looks great with the 240 bumpers! The only thing that I would change are the front turn signals...I think the signals mounted high on the grill look funny with the much smaller 240 bumpers. I wonder how difficult it would be to install a 240 grill and lower valances (with the 240 turnsignals). Has anyone ever done this before? I have attached the pics from the link that Hypertek posted.