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#547558 - 11/12/18 08:23 PM Re: BMW E21 Build [Re: Graham, G4FUJ]
Chunky4/4Racer Offline
Talk Morgan Expert

Registered: 28/01/13
Posts: 2300
Loc: South West England
Originally Posted By Graham, G4FUJ
Ahh. Doesn't sound good for the earlier project!
I'm sure this new one will turn out a stunning racer smile


I'm working hard on her becoming a stunner
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#547780 - 12/12/18 07:42 PM Re: BMW E21 Build [Re: Chunky4/4Racer]
Chunky4/4Racer Offline
Talk Morgan Expert

Registered: 28/01/13
Posts: 2300
Loc: South West England
The automatic bell housing has now been bead blasted




Now both bell housings (manual & automatic) are ready for the next stage.
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#551587 - 03/01/19 08:57 PM Re: BMW E21 Build [Re: Chunky4/4Racer]
Chunky4/4Racer Offline
Talk Morgan Expert

Registered: 28/01/13
Posts: 2300
Loc: South West England
We have a roll cage update.
I'm really pleased with how this is progressing. Loving how tight the cage tubing is to the body shell.







The reason for the masking tape is for working out the correct angle needed to allow for the easiest access but with safety/rigidity of the roll cage kept.



You will probablly of noticed that the original rear parcel shelf & bulk head have now been removed. The reason why will be obvious very soon.
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#553401 - 12/01/19 11:12 AM Re: BMW E21 Build [Re: Chunky4/4Racer]
Chunky4/4Racer Offline
Talk Morgan Expert

Registered: 28/01/13
Posts: 2300
Loc: South West England
Managed to source a BMW E12 (5 SERIES) diff running the ratio we wanted of 3.9:1. The only problem is the fact this is an open diff. An original E12 LSD diff is very rare & if you can find one for sale they are very expensive.

I should mention the reason for using the E12 diff & not keeping the E21 diff.
The E21 diff had a huge problem of over heating back in the day when the E21 was raced. I've read quotes & scene pics of the diffs glowing red etc, this was because the diff casings were very compact which meant they couldn't hold much oil. Alpina did release a bigger rear panel which would allow the casing to hold more oil & it was heavily finned but over heating did still occur.
The E12 diff is relatively straight forward swap with only small modifications required to the rear subframe.





Now this diff will be fully stripped, all the internals checked, reused or replaced with new items. The casing & drive shaft flanges will be bead blasted & re-plated.
Hard to imagine looking at it now but this diff will look brand new once completed.
I have sourced a very well known UK company to make me a LSD & internals, their products are already used in high class motorsport.
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#553418 - 12/01/19 11:55 AM Re: BMW E21 Build [Re: Chunky4/4Racer]
Graham, G4FUJ Offline
Salty Sea Dog
Member of the Inner Circle

Registered: 03/07/07
Posts: 21438
Loc: Cheltenham, Glos. UK
Bit of gunk and T-cut that will come up a treat! laugh2
Don't know much about BMW racers so the E21 info was new (mind you I seem to know less and less as the years go by!).
Probably not new Quaife internals then?
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D8921 L44FOR '93 4/4 Giallo Fly 2 seat smile
'90 LR 90 SW
'07 MINI Cooper

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#553428 - 12/01/19 12:12 PM Re: BMW E21 Build [Re: Graham, G4FUJ]
Chunky4/4Racer Offline
Talk Morgan Expert

Registered: 28/01/13
Posts: 2300
Loc: South West England
Originally Posted By Graham, G4FUJ
Bit of gunk and T-cut that will come up a treat! laugh2
Don't know much about BMW racers so the E21 info was new (mind you I seem to know less and less as the years go by!).
Probably not new Quaife internals then?


Correct this time not Quaife even though I have used their products in the past & they have operated faultlessly.
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