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Old 04-07-2008, 05:46 PM   #16
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Roger DeCoster tested that back in the '70s on his works Suzuki.I wonder who originated the idea?
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Old 04-07-2008, 08:43 PM   #17
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It wasn't bmw that came up with that one, but the racing team at the time. It's purpose was to eliminate brake dive and I guess it worked pretty well.
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Old 04-08-2008, 04:50 AM   #18
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The anti-dive was added partway through the season ('78 I think) so there are a few pictures of the same bike without it. Todd Shuster (fabricator for the B&S race team) made it. The cutaway stacks, though, are not original to the bike in '70s trim. None of the carbureted B&S race motors had stock inward-facing intakes, so that interference wasn't a problem.
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Old 04-08-2008, 08:08 PM   #19
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Butler&Smith 90S

Quote:
Originally Posted by AntonLargiader
The anti-dive was added partway through the season ('78 I think) so there are a few pictures of the same bike without it. Todd Shuster (fabricator for the B&S race team) made it. The cutaway stacks, though, are not original to the bike in '70s trim. None of the carbureted B&S race motors had stock inward-facing intakes, so that interference wasn't a problem.
The bike changed every time it was raced by B&S during the '76 season...stock brakes worked at Daytona but took a dump at the second race, Laconia....I'd have to ask Udo if he changed the carb/intake setup during the '76 season or if it was a change made in '77 by Johnny's BMW/Bakersfield......since the bike won one AMA National (Daytona) when fielded by B&S and one AMA National when entered by Johnny, modifications made afte B&S sold the bike to Johnny are historically valid......and BMW must feel the same as they have not returned the bike to its '76 Daytona-winning spec but rather have left it as it was when Johnny quit racing it and put it in the back of his showroom -- where I found it.......and the John Long bike made by Udo/Todd was way faster'n than the old B&S bikes.....it was made up of lessons learned on the B&S bikes....the long tubes on the anti-dive suspension are Cummins pushrods........Bruce
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Old 04-08-2008, 11:33 PM   #20
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Quote:
Originally Posted by funhouse
I'd have to ask Udo if he changed the carb/intake setup during the '76 season or if it was a change made in '77 by Johnny's BMW/Bakersfield
Looking at the old pictures of the Daytona race I would say the intake setup of #83 is original.

Rudi
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Old 04-09-2008, 09:23 AM   #21
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Originally Posted by RGregor
Looking at the old pictures of the Daytona race I would say the intake setup of #83 is original.

Rudi
when i saw the bike at Riverside '76 it had the carbs sticking out straight, had so much compression that it had to be started on rollers and had long intake stacks........I sent all my historic record to BMW when they got the bike and I now have nothing left to refer to......bruce
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Old 04-09-2008, 09:23 AM   #22
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Quote:
Originally Posted by RGregor
Looking at the old pictures of the Daytona race I would say the intake setup of #83 is original.

Rudi
when i saw the bike at Riverside '76 it had the carbs sticking out straight, had so much compression that it had to be started on rollers and had long intake stacks........I sent all my historic record to BMW when they got the bike and I now have nothing left to refer to......bruce
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Old 04-09-2008, 10:45 AM   #23
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Too bad BMWNA pissed away the opportunuty to aquire Pridmore's F750 BMW.
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Old 04-09-2008, 10:50 AM   #24
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Quote:
Originally Posted by ADK
Roger DeCoster tested that back in the '70s on his works Suzuki.I wonder who originated the idea?
Never seen a BMW with Earles forks?
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Old 04-09-2008, 01:56 PM   #25
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Never seen a BMW with Earles forks?
Them's not Earles forks on the 90S race bike...........
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Old 04-09-2008, 04:55 PM   #26
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Quote:
Originally Posted by funhouse
Them's not Earles forks on the 90S race bike...........
Never said they were. You asked where the idea originated. Unless you use a floating backing plate, Earles forks have inherent anti-dive geometry.
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Old 04-09-2008, 08:35 PM   #27
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I stand

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Originally Posted by xlcr
Never said they were. You asked where the idea originated. Unless you use a floating backing plate, Earles forks have inherent anti-dive geometry.
corrected.....
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Old 04-09-2008, 09:50 PM   #28
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I was trying to figure out how they prevented dive! Thanks!
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Old 04-12-2008, 10:54 PM   #29
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Quote:
Originally Posted by funhouse
when i saw the bike at Riverside '76 it had the carbs sticking out straight
This is an early photo of #83. Look at the carbs, the setup looks the same.
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Old 04-12-2008, 11:13 PM   #30
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Quote:
Originally Posted by xlcr
Never said they were. You asked where the idea originated. Unless you use a floating backing plate, Earles forks have inherent anti-dive geometry.
Don't know if I understood this correctly.
My explanation: The backing plates where the calippers are mounted can be rotated around the axle. They are connected to the lower triple clamp via pushrods. When braking you have a momentum at the backing plate pushing the triple clamp upwards, working against the dive forces of braking that will lower the front. If the geometry of the levers is correct, the two forces could compensate each other.
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