Highly modified but purposefully Build Amazing E9999 on bat

I’ve forgotten more than I can remember on this build, but maybe someone here knows?

Was this very specific platform chosen for a reason on such an absolutely open-checkbook style build?

Paul started with a ‘73 US spec CS - the extensive additional factory bracing added to the chassis that year probably adds some nice rigidity to a fairly flexible base platform, when the ultimate goal is a high hp/tq restomod build.
 
tightbox said:
Paul started with a ‘73 US spec CS - the extensive additional factory bracing added to the chassis that year probably adds some nice rigidity to a fairly flexible base platform, when the ultimate goal is a high hp/tq restomod build.
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I may be mistaken but I don’t think a ‘73 chassis differs much from a ‘71. The bumpers and mounts are different, and there is a nut welded to the roof for a shoulder harness.
 
floridabmx said:
Beauty, but lord you might as well have installed tow mirrors!
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Ha! I had a set of power mirrors years ago that I was going to put on my coupe. I finally decided against them because I thought they looked a little bulky.

I love so much about Paul/Rey's car, the painted out mirrors (even the headlight washers are Fjord) just go with the overall vibe of the car. It's just fantastic!
 
tightbox said:
I’ve forgotten more than I can remember on this build, but maybe someone here knows?

Was this very specific platform chosen for a reason on such an absolutely open-checkbook style build?

Paul started with a ‘73 US spec CS - the extensive additional factory bracing added to the chassis that year probably adds some nice rigidity to a fairly flexible base platform, when the ultimate goal is a high hp/tq restomod build.
Click to expand...
Paul is an engineer who travelled quite frequently and when he was in his hotel room, instead of heading to the bar, he started to create a BMW that BMW Motorsport would have built in 1975 had production continued. His goal was to use only OEM, factory correct parts. BaT will be posting more info on his thought process which should be quite entertaining. Paul had restored cars previously including an e-type roadster and his attention to detail is surpassed by no one.
 
I would be very interested in how rigid and solid this chassis is; how much of a difference seam welding makes; and how solid this car feels. The tweaks Erik in Netherlands is doing is impressive as to building a strong foundation.
 
HB Chris said:
Paul is an engineer who travelled quite frequently and when he was in his hotel room, instead of heading to the bar, he started to create a BMW that BMW Motorsport would have built in 1975 had production continued. His goal was to use only OEM, factory correct parts. BaT will be posting more info on his thought process which should be quite entertaining. Paul had restored cars previously including an e-type roadster and his attention to detail is surpassed by no one.
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That’s exactly what I’m wondering - if the goal was to use OEM/factory correct as much as possible, AND build it out to the ‘nth degree, why not get every last little bit of extra chassis rigidity from all of the extra US mandated ‘73 brackets?

I was doing a toothbrush detail/clean up on my survivor US spec ‘73, and was surprised at how heavy duty all of the additional bracing was for those bumpers vs. the earlier cars. 3C1D5067-A65C-4662-84C3-4A20BD2FB3D0.jpeg
 
tightbox said:
That’s exactly what I’m wondering - if the goal was to use OEM/factory correct as much as possible, AND build it out to the ‘nth degree, why not get every last little bit of extra chassis rigidity from all of the extra US mandated ‘73 brackets?
Click to expand...

I’m not sure if you saw the posts on this a little bit further up, but the ‘73 doesn’t have extra chassis rigidity. All of that came for US MY74. 1973 only saw a seatbelt change and a 2.5mph bumper change. That bumper change was basically bigger/more rubber, collapsible steel bumper hoop mounts, and a bumper that sat further from the body.

With that said, the gussets below aren’t present on the pre-73 US cars or euro cars. This is the first time I have noticed these. They do nothing to make the chassis more rigid however.

2D3C31A0-B2B2-4CDF-B894-DEF25E897EF3.jpeg


Here is a pic from the BaT 3.8CSI:
1F931E81-4E3A-43F9-B078-5AFF5B003C18.jpeg
 
Interesting to read Paul Cain's support comments in this auction. Certainly he has a result to be most proud of. Appears buyer will also get builder support for life. Wow.
 
@Markos, yes - I was referring to those gussets. I was also unaware of these before scrutinizing my ‘73 during cleaning last week.

I figured as heavy duty/overbuilt as they are, they might add something appreciable to the chassis stiffness - I stand corrected by the forum experts!
 
dang said:
Is it just me or are the front bumperettes and/or bumper angled up slightly? At that angle it looks like it bumped something. Left side higher maybe? Maybe I'm hallucinating. I know I've never liked the strange angles of the CS bumperettes and rubber overlays.
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Seems so. Usually you don't see those rivets on the airdam:

1973_bmw_3-0cs_16202480227f52ae3f30CS_025_web-scaled.jpg
 
tightbox said:
I figured as heavy duty/overbuilt as they are, they might add something appreciable to the chassis stiffness - I stand corrected by the forum experts!
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Well I’m a forum expert but not an e9 expert. :) I have taken apart one of these bad boys however. There is zero structure or support rear of the wheel wells. The wells are made of multiple layers of metal. The arch of the well is the strength and kind of serves as a spine. The rest of the tails just floats off of this with no semblance of a frame at all. Just sheetmetal. That’s why when you see an e9 completely apart, you can take the whole rear end off.

3C7077D3-944A-45DB-8B38-0F5DEF81B5F0.jpeg



In ‘74 they added big gussets off of the wells, and frame tubes at each corner of the rear that the 74 bucket shocks fit into.
 
teahead said:
It may have to do w/the conversion from 73 brackets to 68-72 brackets???
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Based on Paul's comment below on BaT, my guess it has do with the air dam being bolted to the bumper.

"It bolts to the bottom of the bumper and does not touch the body. It was a substantial undertaking and one of the more difficult items to execute on this build."

Pics below from Monterey 2016
Monterey 327 (2).JPG
Monterey 352 (2).JPG
 
Markos said:
I’m not sure if you saw the posts on this a little bit further up, but the ‘73 doesn’t have extra chassis rigidity. All of that came for US MY74. 1973 only saw a seatbelt change and a 2.5mph bumper change. That bumper change was basically bigger/more rubber, collapsible steel bumper hoop mounts, and a bumper that sat further from the body.

With that said, the gussets below aren’t present on the pre-73 US cars or euro cars. This is the first time I have noticed these. They do nothing to make the chassis more rigid however.

View attachment 119661

Here is a pic from the BaT 3.8CSI:
View attachment 119662
Click to expand...
I am assuming he added the ribs for support of another layer of metal added parallel to the body to stiffen the mounting holes for the bumper bracket. I have played with that section of the E9 a lot since everyone of them had sort of damage from slow speed accidents. Aside from that I agree with Markos as I don’t believe they would do anything to straighten the chassis.
 
Am I wrong or the right side headlight washer stoppers are wrongly located?

The left ones look fine.

Could be an effect of reflector's or chrome rings incorrect assembly/selection.

1621789492245.png
 
They are adapted e24 units, which have different wiper orientation. On an e24, each wiper has its own pivot point, with the motor operating a set of linkages. The motor is effectively the same unit but may have a different degree of rotation (I haven’t checked). The e9/e12 has a centrally located motor with an arm that directly drives both wipers.

Consolidated Notes: E3/E9 Headlamp Washer System

Hi Folks, As of late I have been attempting to better understand how the E3/E9 headlight wiper system works. I need to put together the plumbing and electrical for my wipers. I’ve talked to several folks including a sales contact in Germany, Nicad, Luis A., Carl at La Jolla, and Brucey over on...
e9coupe.com e9coupe.com

One has to remember that when this coupe was restored, it wasn’t as easy to find parts online as it is today. Also, this coupe is loaded with late model features and the upgraded HL wipers may have been intentional.


Krzysztof said:
Am I wrong or the right side headlight washer stoppers are wrongly located?

The left ones look fine.

Could be an effect of reflector's or chrome rings incorrect assembly/selection.

View attachment 119813
Click to expand...
 
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