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Stainless Esprit front bumper mounting brackets


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  • Gold FFM

Following expressions of interest in my project thread regarding the replacement front bumper mounting plates I've had manufactured from Stainless Steel I thought I would start a separate thread to see what level of interest there was before I speak to the engineering company that made them for me about a volume discount if there is sufficient interest. @Bibs hopefully I'm not breaking any rules by posting this, but if there is anything I should be doing now or before going ahead with any potential group buy please let me know.

The brackets I've had made are for the front bumper only on my S4s at this stage. As far as I know these brackets are common to the S4, GT3 and V8s too? Not sure if all V8s apply or if any of the earlier Stevens Esprit can use them. If anyone can confirm if there are any differences etc that would save me some effort.

Quantities are based on what I found on my S4s, I haven't yet checked if all cars are the same or if Lotus chopped and changed what items they used where on the different models.

  • A082B5002F - x8 large stud plate - x6 front bumper to lower spoiler and x2 front bumper corner to body shell (£8.86 each inc. VAT from Lotus)
  • A082B7321F - x2 small stud plate - Front bumper to lower spoiler (£13.34 each inc. VAT from Lotus)
  • B082B4811F - x8 large nut plate - Front lower spoiler to oil cooler duct undertrays (£15.68 each inc. VAT from Lotus)
  • Part number unknown - x2 diamond nut plate - Front bumper corner to body shell (I don't know the Lotus retail price because I can't find the part number)

These are the stud and nut plates that go in the nose of the body shell just in front of the headlamp pods (x2 A082B5002F and x2 the unknown diamond shaped nut plate)IMG_20200815_183449.thumb.jpg.fc0389bb9b7cd8a3361e83af3961bb2d.jpg

 

These are the stud plates that go into the lower edge of the front bumper which the lower spoiler is secured to (x6 A082B5002F and x2 A082B7321F)

IMG_20200815_184751.thumb.jpg.77f29f5adec244aaabf58cdcc158985c.jpg

 

These are the nut plates in the bottom of the lower spoiler that the oil cooler duct undetrays bolt to (x8 B082B4811F)

PXL_20210221_140802252.thumb.jpg.335d3db3df86a8d31ce230e07089db8c.jpg

 

Based on the individual prices above the total cost of a complete set from Lotus is £223 pounds and that doesn't include the diamond shaped part I couldn't find a part number for, so based on the price of the other parts you could probably add another £15-£20 for those two. The one off run of all the stainless parts I had made cost me £180 but this did include two spare of each part just in case I missed any in the parts list; my car was missing most of the plates so I wasn't really sure how many of each I would actually need and the parts list isn't especially clear either. The cost of parts that actually ended up on the car was probably nearer £130 as a rough percentage. As you might expect, the more I get made the lower the unit cost will be. I don't want to try and second guess what sort of discount I might get until I know what sort of numbers I might be looking at or if there is even enough interest.

At this stage I'm just interested in knowing if people might be interested in buying complete sets or part sets of these stainless brackets so I have some numbers to enquire with. No one is on the hook to buy anything at this stage.

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Norfolk Mustard S4s #1 :)

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Following expressions of interest in my project thread regarding the replacement front bumper mounting plates I've had manufactured from Stainless Steel I thought I would start a separate thread to se

I have item 5 handy, I'll have to dig out 8 from wherever I put it. 🤷‍♂️ should have that tomorrow. Item 5 is 670mm x 20mm (it's 1.5mm thick but it looks like your plates are a little thicker tha

I found item 8, it is still riveted to my bumper. 🤣 That made life a little more challenging as its stored on the rafters above the car in the garage, so some careful crawling around was needed.

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  • Gold FFM

Hi Tom,

I'm interested in a full set but there are some additional plates that have no captive parts as well, I'd like to see if these can be made up too?

Items 5,6,8 and 2x 12. I will have them off my car over the weekend and can share dimensions or post them as examples if you fancy completing the set?

I'm not sure if I have items 92 and 93 or not or if I'm supposed to??

cheers

-Chris

image.png.9aa451bf97a385703a0fa65f8ca3729d.png

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  • Gold FFM

If you can get dimensions/photos/drawings to me can certainly enquire on prices for any additional parts.

Items 92 and 93 are present on my car but they are plastic parts that self tapping screws in the ends of the bumper screw into so not sure making them in metal will work.

Norfolk Mustard S4s #1 :)

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Hi. Really interested in these. Can you confirm regarding the diamonds which go in the pod area. Are these to affix the very corners of the front bumper which if not used cause the front corners of the bumper to sag? 

I removed and replaced the bumper getting a better alignment but the corners still look a little droopy and would like to get this sorted correctly come repaint time 👍

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Damn those brackets. I think the captive bolts may well have stripped in one of mine. I will definitely be in the market fir a pair of those if not all the brackets. The thought of removing that front assembly again tho reduces me to tears. What a pig of a job!

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  • Gold FFM
On 23/02/2021 at 20:13, cweeden said:

Items 5,6,8 and 2x 12. I will have them off my car over the weekend and can share dimensions or post them as examples if you fancy completing the set?

I began stripping down the spare bumper I obtained for my car yesterday and I have most of those items to be able to measure myself now.

I don't have item 8 available to measure and if you could measure the position and size of the notches cut into item 5 that would be handy too.

Norfolk Mustard S4s #1 :)

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  • Gold FFM

I have item 5 handy, I'll have to dig out 8 from wherever I put it. 🤷‍♂️ should have that tomorrow.

Item 5 is 670mm x 20mm (it's 1.5mm thick but it looks like your plates are a little thicker than standard which is a good thing)

There are 5 slotted holes that are 6.7mm x 9mm

From each end there are two with centres at 15.5mm, 135.5mm plus one centres on the plate.

In addition there are two grooves with a semi-circular end, these are 6.5mm wide and 15.7mm deep centred 278.25mm from each end.

IMG_9876.thumb.jpg.325bdbc7bb69c4c51cf363b3adb47e63.jpg 

Sorry for the fractions of a mm, I got my calipers out and couldn't help myself.

cheers

-Chris

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  • Gold FFM

I found item 8, it is still riveted to my bumper. 🤣

That made life a little more challenging as its stored on the rafters above the car in the garage, so some careful crawling around was needed.

The plate is a 'U' section piece 790mm long, 20mm wide and 5mm high, foolishly I forgot to measure where the rivets are located (I'll grab that later), you have the stud spacing based on the hole location in the above supporting plate.

The curve of the bumper prevents the bar from being any longer as it is already being flexed slightly at the ends but the shape of the ridge. It also means you don't want to make it any wider and in fact the radius of the curve in the 'U' is helping a but here. It might be a design idea to offset the studs to one edge of the bar a little (maybe 2mm or 3mm) to position the bar that much further back and away from the ridge. You can just about make out what I mean in the first photo below.

image.png.5b4de1431fa801b52dbc9fe1db79fbf4.png  image.png.1bc5f909827c4f02fcb1678a8f27e6a3.png  image.png.8f7da4de42f5ebe69475dd5c205c2565.png  image.png.3aed40b955a0de320e8baee1534f68c5.png    

I'll grab the length of the studs (bolts too). Let me know if I've missed anything else?

cheers

-Chris

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  • Gold FFM

That's item 6 isn't @cweeden? Assuming it's in the top edge of the bumper as it looks to be, I've already one of those here that I can measure.

Item 8 goes into the bottom edge of the bumper and bolts up into the frunk floor I think. I just had a quartet of M6 nuts and bolts in there on mine because that bracket was missing entirely. I sourced a new one from SJ, albeit not in stainless because I didn't have one to measure to get a stainless one made. Mine is now inaccessible for measuring having put all the front undertrays back in place in the last few days 🤦‍♂️

Norfolk Mustard S4s #1 :)

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  • Gold FFM
1 hour ago, tomcattom said:

That's item 6 isn't @cweeden? Assuming it's in the top edge of the bumper as it looks to be, I've already one of those here that I can measure.

Item 8 goes into the bottom edge of the bumper and bolts up into the frunk floor I think. I just had a quartet of M6 nuts and bolts in there on mine because that bracket was missing entirely. I sourced a new one from SJ, albeit not in stainless because I didn't have one to measure to get a stainless one made. Mine is now inaccessible for measuring having put all the front undertrays back in place in the last few days 🤦‍♂️

Doh! Yup, my bad. Let me see what I can find, it will be in one of the boxes. 

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  • Gold FFM

If you can't find it all we really need is the hole spacings so we could compare my spare bumper with yours to check they're consistent.

Norfolk Mustard S4s #1 :)

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  • Gold FFM

IMG_9895.thumb.jpg.ae847bcddcdd7b38e46f6acb71e6c976.jpgHopefully you can make sense of this, let me know if you have any questions. It's flimsy like all the others. I didn't mention the length of the studs but I'm sure they are the same as the others.

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  • Gold FFM

Thanks Chris. I'll start creating the new CAD models and drawings for these extra parts at the weekend and get them over to the engineering company for a quote as soon as I can.

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Norfolk Mustard S4s #1 :)

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  • Gold FFM
11 minutes ago, tomcattom said:

Thanks Chris. I'll start creating the new CAD models and drawings for these extra parts at the weekend and get them over to the engineering company for a quote as soon as I can.

What, you mean my drawing is not good enough to send as it is? 🤣

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