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Old 04-06-2008, 03:35 AM   #1
RGregor OP
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Meeting two old ladies

Hi folks!

Here's a little story about a special meeting I had last month.
I've been a BMW maniac as long as I can remember.
My father bought his /5 when I was about 8 years old and I knew instantly: "when I'm old enough ..."
And of course racing with airheads was most interesting to me.
Helmut Daehne on the Nordschleife or on the isle of man.
Years later I heard about the Butler & Smith racing activities in the US.
The legendary race at Daytona.
Read about the bikes and the man who built them.
But only sparse information and few photos were available in the time before the internet.
And in germany the story is still nearly unknown.

Then I found this thread here in the forum:

http://www.advrider.com/forums/showthread.php?t=244174

And there it was: the last remaining BMW Superbike from '76.
Beautifully restored to its former glory.
And I learned that the bike (and a second BMW Superbike built by Udo Gietl) now is with BMW Mobile Tradition in Munich, my home town.

Normally private persons are not allowed to see the historic collection at MT. I thought "why not try" and so I wrote an email to BMW MT if it would be possible to see these bikes.
Two weeks later my telephone rang and it was MT: "Of course you can see the bike, let's make an appointment".
A few weeks later we entered the "holy ground". Mr. Helm, the BMW expert for post '69 bikes led us. And that was really crazy.
Passing several historic race cars we entered the MT shop, where a BMW M1 and a CSL were on a car lift.
Walking around an F1 turbo engine of the 80ies on a palette we came to the bikes standing in the corner besides others and a 2002 Turbo.
Felt like christmas and birthday together.

The Butler&Smith 90S has been already completely restored by MT, as is their standard procedure with "new" models they buy.
However, Bruce's paint job had been so good they kept it.

It was a great sensation to see the bikes, see the details described in books or magazine articles and to find new interesting details never heard of.
Here are some pictures of the bikes in their new home.
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Old 04-06-2008, 03:37 AM   #2
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In the background on the right side another BMW M1 and in the center you can see the turbo charger of the F1 engine.
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Old 04-06-2008, 03:38 AM   #3
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Some engine details. Beautifully restored.
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Old 04-06-2008, 03:39 AM   #4
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And the other old lady, #36. The rear shocks are rebuilt at the moment :-))
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Old 04-06-2008, 03:41 AM   #5
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I learned that #83 will be shown in the BMW museum from next year on.
So if you ever come to Munich, make an appointment with the old lady. It's worth the money.

Greetings from Munich

Rudi

PS: on one wall the standard BMW tool equipment was installed and a set of exhaust pipes hang there.
"Where do these belong to"? "These? They are from Walter Zeller's RS 54" Sure, dumb question.

PPS: thanks Bruce.
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Old 04-06-2008, 01:36 PM   #6
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very cool.
thanks!
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Old 04-06-2008, 02:16 PM   #7
Foot dragger
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Nice pics,Id love to see their collection as well.
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Old 04-06-2008, 02:52 PM   #8
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Quote:
Originally Posted by RGregor
Some engine details. Beautifully restored.
Is that frame strut going THROUGH the velocity stack?
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Old 04-06-2008, 04:48 PM   #9
soyanarchisto
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I was wondering that too
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Old 04-06-2008, 08:11 PM   #10
funhouse
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frame thru airstack

any horsepower loss was more than made up for by the reduced frame flex.....a product of doubling the horsepower and use of huge (for the time) tires......the frame/swingarm/forks all had to be reinforced.....the bike ran in the low 11's and 118mph....hot stuff in the early days of Superbike racing....Bruce
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Old 04-06-2008, 11:35 PM   #11
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I was wondering how the velocity stack was assembled. Thinking about it, it seems like everything would have been assembled but for the brace, which was then threaded through the hole in the stack and bolted on.

It appears that when they built #36 they decided to customize the intake ports and angled the carbs out rather than in towards the tranny.
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Old 04-07-2008, 12:19 AM   #12
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Quote:
Originally Posted by tvrla
I was wondering how the velocity stack was assembled. Thinking about it, it seems like everything would have been assembled but for the brace, which was then threaded through the hole in the stack and bolted on.

It appears that when they built #36 they decided to customize the intake ports and angled the carbs out rather than in towards the tranny.
I doubt it's a hole. I'd bet it's a slot cut into the inboard side of the stack.

I thought those bikes had the motor mounts raised in front to provide more cornering clearance, but the mounts appear to be pretty standard.

When I've dealt with the guys at MT, they strike me as enthusiasts just like us, only with the coolest job they could ever imagine.
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Old 04-07-2008, 08:23 AM   #13
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hole in air stack

Quote:
Originally Posted by kbasa
I doubt it's a hole. I'd bet it's a slot cut into the inboard side of the stack.

I thought those bikes had the motor mounts raised in front to provide more cornering clearance, but the mounts appear to be pretty standard.

When I've dealt with the guys at MT, they strike me as enthusiasts just like us, only with the coolest job they could ever imagine.
1: They are holes, not slots......and was one of the most time consuming parts of the restoration.......one set of stacks was sacrificed to make the final set....a big slot in the first set was taped up to determine where the opening was located on the final set ... all established by where the stack rested when fully tightened on the carb......enlarged with a file until the fit was perfect..the brace has to be removed to check the oil..and as for engine location, it sits an inch forward in the chassis....there is a spacer behind the transmission output shaft.....and the engine was short-rodded so the heads are moved in about 2" total....Bruce
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Old 04-07-2008, 09:01 AM   #14
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Quote:
Originally Posted by funhouse
1: They are holes, not slots......and was one of the most time consuming parts of the restoration.......one set of stacks was sacrificed to make the final set....a big slot in the first set was taped up to determine where the opening was located on the final set ... all established by where the stack rested when fully tightened on the carb......enlarged with a file until the fit was perfect..the brace has to be removed to check the oil..and as for engine location, it sits an inch forward in the chassis....there is a spacer behind the transmission output shaft.....and the engine was short-rodded so the heads are moved in about 2" total....Bruce
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Old 04-07-2008, 06:07 PM   #15
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Check out the linkage arrangement on the front brake of #36.

It looks like BMW engineered a floating caliper rig that transfers thrust from the caliper under braking upward into the fork tube - to counter brake dive, maybe. If that's the case, that is some fantastic attention to design details.
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