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EuroDat

Fitting 240Z bumpers and Valences to a 280Z

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Charles, Im planning to paint it once all the fitting is over. It is easy enough to remove and take it to the paint shop. Matching the colour might be an issue, but the paint work is shoddy at beat so a little mismatch way make it any worse.

 

I have a question, maybe someone can answer.

 

I am making the bumper bracket (or getting them welded together). What is causing me some concern is where to put the holes for the bumper itself.

 

There are two bolts per bracket and they are about 33mm apart, I dont have an original bumper so I dont know how far apart the brackets are from each other. The bumper Im using is fibreglass and has a very long (80mm) slot so there is quite a bit of variance available.

 

The plan is to change to the chrome bumper or maybe a Harrington stainless steel version later. That means if I don't get the brackets right now, Ill have to make them again later.

 

I made a quick drawing to help explain what I mean. The ??? dimension is the one I need. Can't seem to find anything about it on the internet.

 

Any help would be much appriciated.

 

BumperBracket-1.pdf

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I measured 770mm ctr to crt of inside bolts, holding tape straight across. This is on my '70 240Z.

 

post-7818-0-44399100-1435267554_thumb.jp

 

post-7818-0-47430400-1435267587_thumb.jp

 

post-7818-0-68382700-1435267604_thumb.jp

 

 

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Thank you CanTechZ.

Im glad you came with the measurements. My fisrt etimate was 750mm which would have left me 10mm short on both sides.

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Its been a while, but it been just too bloody hot to work on the car lately.

 

I've had the bumper brackets a couple of days now and decided to brave the heat and fit them today.

 

All the brackets so far are hand made and a little shabby here and there because I have been making corrections, redrilling, rebending etc.

The final brackets will be cut with a laser  and look a lot better than these. Just need to make the same adjustments in the dxf files.

 

The bumper brackets are made from 3mm, but the final brackets will be 4mm. The 3mm would be ok for fibreglass, but I think they would be too flexable for the chrome or stainless steel bumper.

 

post-25317-0-51356400-1435777169_thumb.j

Fitting the bumper bracket. Still need some washers and painting here and there. That will happen when it comes apart for the final brackets.

 

post-25317-0-13687800-1435777232_thumb.j

Everything back together.

 

If anyone is interested in a set, I plan to cut a couple of sets (while Im at it).

A kit could include:

2x Bumpers brackets with ss bolts and nyloc nuts.

2x Grill top mounts.

2x Grill bottom (side) mounts.

2x Long vertical bars for the grill plus M3 bolts and nyloc nuts.

(These are to convert the grill from 7 to 9 bars and lower the 240z grill centre anchor to connect behind air-dam)

2x Side vertical bars for 9 bars plus M3 bolts and two extra nuts for side mounts.

2x Brackets to mount the horn. (On the 77-78 the horns were mounted on the bumpers shock)

Everything except the 4 verticle bars is made from Stainless steel 304, bolts and nuts are A2-70. The 4 verticle bars are aluminium.

Instruction how to get there (without all the experiments I went through).

 

 

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Its's been a while and I finished it a couple of weeks ago, but my fuel pump gave up and kept me buzy.

 

This is probably one of the last weekends before it goes into hibernation and I took this photo when I came home.

post-25317-0-52438700-1445166429_thumb.j

 

and here is a before and after.

post-25317-0-22059000-1445166565_thumb.j

 

Im planning to have the brackets made from stainless steel. Most parts are now aluminium so I could make adjustments.

If anyone is interested in a set, let me know.

 

 

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Great write up and a superb final result, EuroDat.

BTW, did you do the work on the van in the background in the "after"  pic? That turned out nicely as well!  :rolleyes:

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Great write up and a superb final result, EuroDat.

BTW, did you do the work on the van in the background in the "after"  pic? That turned out nicely as well!  :rolleyes:

Yikes!  I totally missed that at first.  I was thinking, "What's he talking about?"  Then all of the sudden I realized that wasn't light reflecting off the van.  

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Great write up and a superb final result, EuroDat.

BTW, did you do the work on the van in the background in the "after"  pic? That turned out nicely as well!  :rolleyes:

Unfortunatly no. Thats my next door neigbour's van. I only get to hear how hard if is to have the best job in the world😕. His father owns After eden and he is also in the family business. He likes the R&D most. Especially the "test fitting". Photo shoots for the new assortment would run a very close second.

post-25317-0-46125600-1445533065_thumb.p

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Mike,

Update

We have been playing with the design a little. My first design was mounted in top of the frame, but that meant you would need to remove the 280Z indicators and the frame support. This design would require 240Z / 260Z indicators undr the bumper.

The second design is under the indicator support in the box section. This way you can drill holes through the support and mount the bumper bracket undrr the indicators. It's a pita determining where to drill the holes because you drill from the top. I'm trying to make a cardbourd template that you can place on top to mark where the holes will be.

The next thing that I want to make is a bracket for a tow hook. Now the air-dam and extended grill are fitted, I can't use the old tye down brackets. This new bracket will fit where the old bumper shocks bolted to the frame. You can than screw a tow eye into the bracket for towing the vehicle.

Its fallen into the background with christmas and all the family activities, but Im planning to get back to it this week. Draw my templates in Acad and compile them for the watedjet cutter.

Once I make some progress and photo's Ill let you know. If you are still intrrested, Ill add you to the list.

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Sounds good. I like the idea of keeping the 280 indicators. I assumed I would lose the tie down location due to the valance style (yours) I will go with.

The tow hook idea sounds good too. I'm not against having a dedicated hook through the valance either...

Maybe a bar that bolts across the front behind the grill using the existing bumper mounts could be designed to attach both the bumper mounts and the tow hook...

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Thats it exactly. I would like something that you can screw in when needed and store in the tool roll when not. The bracket will have something like an M20 female thread so a bolt with a tow hook (eye) can be screwed into it.

I am basically copying our Renalt. Since its about 250kg heavier than the 280Z the tow bolt should be strong enough. Google "Renault 8200519463" for an idea.

Now trying to make a bracket with as many contact points possible to spread out the "jerking" stress/load from being towed. And making it a bolt on addition, not something you need to drill and weld to fit.

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That is why I was thinking a cross brace between the two existing bumper shock mount points. From there, you would have the right height to mount the front bumper and add the tow hook thread point. Wouldn't need to as heavy duty as the examples below if it was steel versus aluminum. The crash bar in my 370Z performs this same function. Might work!

crashbar.thumb.jpg.4b7ce91df9fb1fa547eae

 

Z34FrontBumperAluminumCrashBar.jpg.fd21c

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I haven't had much time lately so any progress has been slow. I did manage to cut out a template to do some test fitting and determine where bolt should be mounted. The top bolt will need a spacer behind it to compensate for the height difference, but it fits nicely.

 

IMG_1592.JPG

IMG_1593.JPG

IMG_1597.JPG

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Do you concur with the idea that we can mount the bumper to a cross brace along with a tow hook? Does it appear to be at the right height for your configuration to do this?

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It would work. I think it would be a little lower than the 240Z bumper centerline. That is because the shock mounting bolts are, all except the top rear bolt, under the shock. And the thicker bumper has a lower centerline making the shock position lower.

You could probably overcome that problem with brackets. One thing to take into consideration if you would do that is the bumper mounts are further towards the center. I wanted to close the gap behind the grill, but these brackets stopped me from doing that. That is why I made the brackets for under the 280Z indicators.

 

 

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A small update. I have not had a lot of time to work on the Zed lating. Work has been buzy as well and everytime I want to make the threaded blocks, someone else was using the mill.

Ill tack weld the block to the test plate and test its position. Then I can make a jig to fully weld the bolt with a thicker plate.

Found a tow eye the right length. Its from a Renault Clio. The Clio is about the same weight range as the 280Z, so it should be strong enough. It should protrude about 60mm out past the bumper.

 

IMG_1620.JPG

IMG_1621.JPG

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Fitted the block in place with a couple of tack welds to check if all the dimmensions were good. I made a couple of adjustments and now ready for the final template.

I liked Mikes idea with the 370Z design, but ended up going with this idea for two reasons.

1: I can fit it without removing the bumper, air-dam and grill again.

2: Fitting it would be challenging. You need to fit it between the two frame rails. It would have to be a perfect fit to avoid distorting the frame. For example; If you made it 5mm smaller to aid fitting or it contracted during welding, it would pull the frame rails closer together.

I would have chose this design if the bolts were on the front of the frame instead of the side.

IMG_1625.JPG

IMG_1626.JPG

IMG_1628.JPG

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