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knitandcrochet 
Newbie
Joined: 10-April-2006
Location: north wales
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Points: 24
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 Topic: how do u tell e12/e28?
Posted: 20-April-2006 at 16:43 |
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im new to six ownership and this question has
probably been asked before but how do you tell the
differance between a E12 based car and an E28
based car? mine was built in june 1982 and i was
told the cut off date between the two was round
about then so how do i know for sure?
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
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Points: 1365
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Posted: 20-April-2006 at 16:50 |
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Later E28 based cars have wrap around rear bumpers that go all the way to the rear wheel arch.
E12 based cars have a bellows between the bumper & body & no side bumper.
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AndyS Live each day as if it's your last - one day it will be. 
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Jimbob
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Location: Live: West Sussex - Work: Islington
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Posted: 21-April-2006 at 07:35 |
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Mine's an e12, note the bumper as per Andy's post - this is the best way to tell at a glance, even though almost everything is different.
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And so says Jimbob.
1981 635csi 81k miles. Will be fixed, but not by me.
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spokey
Bavarian-Board Contributor
Offensive and obnoxious tub of lard
Joined: 02-March-2004
Location: United Kingdom
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Points: 1948
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Posted: 21-April-2006 at 08:50 |
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The rear end of an E28 is more angular than the E12. Also, the front
lights on an E12 are the same size, on an E28 the outside lights are
bigger.
(I think!)
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Ciao,
Spokey
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Brucey
Really Senior Member II
Joined: 07-March-2004
Location: United Kingdom
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Points: 744
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Posted: 21-April-2006 at 17:56 |
E28s have odd-sized headlights but E28-based E24s have the same-sized headlights.
Interior is different as well (door cards, dash pod etc), front suspension is different, rear suspension is different, front wheelarch flares are slightly larger on e28-based cars.
Check your VIN on realoem.com and look for parts compatibility- they are dated.
hth
cheers
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~~~~~~~ Brucey ~~~~~~
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Drew540i
Really Senior Member II
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Posted: 21-April-2006 at 18:50 |
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E12 and E28 relates to the type of 5 Series they were
based on. A 6 Series has always been an E24
despite the fact that the pre and post May 82 cars are
98% completely different cars.
E12 has three large circular instruments (E28 has
two with small square fuel and temp in between and
service lights).
E12 has three rotary heater controls, centre on is fan
switch with digital clock built in.
E28 has on board computer. E12 has chrome
'trigger' type interior door handles built into arm rest.
E28 has plastic ones above the armrest.
E28 has standard ABS, E12 does not.
E28 engine will have 3.2/3.5 cast into inlet manifold.
They look similar but are totally different cars. I think
only the bonnet, bootlid, rear light leanses,
nosecone and front and rear screens are the same
and nothing else interchanges. A June '82 build car
is almost certainly a later E28 type one (thankfully).
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AndyS
Really Senior Member II
The Last of the Few
Joined: 21-August-2003
Location: 55 � North
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Posted: 21-April-2006 at 19:35 |
Or just look at the back bumper 
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AndyS Live each day as if it's your last - one day it will be.
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Horsetan
Really Senior Member II
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Joined: 11-April-2003
Location: Please let it be Ireland
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Posted: 21-April-2006 at 19:39 |
 AndyS wrote:
Or just look at the back bumper
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...which on an E12-based car is as-near-as-dammit identical with the E28-based "Highlines".
The rear panel on an E12-based car (which houses the taillights and number plate) is the same as the "Highlines".
The other difference between "E12" and "E28" cars is the plastic A-pillar gutter end: "E12" cars have much smaller ones, whereas "E28" cars have lengthened ones, with two holes for the bolts that insert into the front wings.....
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Brucey
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Posted: 22-April-2006 at 02:19 |
Drew540i wrote:
E28 engine will have 3.2/3.5 cast into inlet manifold.
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-true enough, but an unreliable indicator of E28-ness; the '80-'82 model (E12 base, motronic) 635 has this style of manifold also. Only the L-jet 635s ('79-'80) had the earlier 'cupped hand' inlet manifold.
cheers
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~~~~~~~ Brucey ~~~~~~
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knitandcrochet
Newbie
Joined: 10-April-2006
Location: north wales
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Points: 24
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Posted: 22-April-2006 at 05:18 |
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thanks guys, going by the date which looking at the
handbook is july 82, i would defo say its E28. its hard
to tell by other things because my cars had many
changes made to it
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phb10186
Really Senior Member I
Joined: 18-April-2005
Location: North London
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Points: 331
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Posted: 22-April-2006 at 13:31 |
Why don't you post a couple of pics, and then you can end this debate accurately.
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1985 635 CSI with Style 134's
1998 Z3 2.8i
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AndyS
Really Senior Member II
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Posted: 22-April-2006 at 19:47 |
E12  Love those Rondells! E28  Now somebody (probably Horsetan) will point out some error here but you get the drift about the rear bumber. Highlines of course are the same yet different:-  However, since your query was about '82 sixes Highlines don't count 
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AndyS Live each day as if it's your last - one day it will be.
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Brucey
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Posted: 23-April-2006 at 03:04 |
BMW's ETK lists the changeover as 5/82 between E12 and E28-base cars. I daresay there are a few oddballs out there, maybe they had to use up a few bits and pieces, but a 7/82 build date car should be an E28 base without doubt.
cheers
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~~~~~~~ Brucey ~~~~~~
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Horsetan
Really Senior Member II
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Posted: 23-April-2006 at 12:08 |
This car now lives in Australia.....
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Drew21
Groupie
Joined: 14-October-2005
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Posted: 24-April-2006 at 11:44 |
on the subject, my car is a late E12 based 1982 car and has the 3.2/3.5 manifold casting and motronic engine mangement, though with an auxillairy air valve rather than the idle stabilisation unit of the later motronic systems.
Does this make it a 3430 or a 3453 engine? and what is the engine code for my engine, the B34/ B35 number? I'm looking for a new cam and am trying to work out what will be compatible. Extra info: on the dizzy, the leads all come out of the side rather than the earlier circular pattern of HT leads with the king lead in the centre.
thanks
for telling an E12 car I would look mostly at the interior as here the difference is very marked in the door cards, the heater controls and the clocks unit.
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Brucey
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Posted: 24-April-2006 at 13:43 |
my parts car is an '81 and this has the 3453cc engine, apparently... I don't know when they changed over to the 3430cc type. Cam drives changed at some odd point (83-84?) and are incompatible before and after due to the drive arrangement. I'm told the cam fitted to the 3453cc engine is 'friskier' but I have not seen a posting anywhere that actually details lifts and durations for the various cams that are fitted to M30 engines; would make interesting reading....
cheers
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~~~~~~~ Brucey ~~~~~~
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Horsetan
Really Senior Member II
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Location: Please let it be Ireland
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Posted: 24-April-2006 at 15:31 |
Brucey wrote:
... I don't know when they changed over to the 3430cc type..... |
May 1982
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Drew21
Groupie
Joined: 14-October-2005
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Posted: 25-April-2006 at 12:42 |
cool, so I got the 3453 block with bosch motronic injection then.
will do some research on cams for the M30....
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Drew540i
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Posted: 25-April-2006 at 18:50 |
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The 3430cc unit came out with the May 1982 E28
based E24, not before. It's really a long stroke
version of the 3.2 engine with it's smaller bores. It
was designed to get around the old 3453cc engine's
appetite for head gaskets. The one piece manifold
with '3.2/3.5' is from the 745i Turbo and was first
used on a Euro M30 with the 3430 motor, same part.
But being BMW, nothing is THAT simple..........South
African built E23's had the one piece inlet manifold in
mid 1981.
Early Alpina B9 3.5 cars up to mid 1983 also have
the old 3453cc engine.
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Jimbob
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Location: Live: West Sussex - Work: Islington
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Posted: 26-April-2006 at 04:42 |
Don't mean to contradict, coz I know you know your stuff, but my '81 635 with the 3453cc block has the '3.2/3.5' marked inlet manifold.
Did I miss read your post?
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And so says Jimbob.
1981 635csi 81k miles. Will be fixed, but not by me.
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how do u tell e12/e28?
