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Old 07-06-2012, 09:53 PM   #1
Carl OP
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Thumbs down Hand of Doom!

Sometime during the life of these parts someone's (not mine!) hands doomed them to scrap, or made a design disaster.


These parts were from a poorly stored BMW R50/2 engine:



This adapter was made by a father-son machinist team. It was used to adapt two different tapers from an early (1955-60) crankshaft to use a later (1961-69) year BMW generator armature:



Why not to over rev the early engine cylinder design on the BMW R69 & R69S models:



The aftermath on BMW R69US engine pushrods when 'racing' a HD Panhead:


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Carl screwed with this post 07-07-2012 at 12:16 PM
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Old 07-07-2012, 12:01 AM   #2
Bill Harris
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Ah, so it was you who ended up buying this eBay wonder:



You did talk him down to $1400, didn't ya?

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Old 07-07-2012, 07:34 AM   #3
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Quote:
Originally Posted by Carl View Post
This adapter was made by a father-son machinist team. It was used to adapt (early armature on a late engine) two different tapers from an early (1955-60) BMW generator armature to a later (1961-69) year model:


Carl,did you mean to say early crank with a late armature?
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Old 07-07-2012, 08:39 AM   #4
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Quote:
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The aftermath on BMW R69US engine pushrods when 'racing' a HD Panhead:


So, who won?
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Old 07-07-2012, 09:29 AM   #5
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Quote:
Carl,did you mean to say early crank with a late armature?
And I think he shoulda said "father-son blacksmithery team"...
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Old 07-07-2012, 12:19 PM   #6
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And I think he shoulda said "father-son blacksmithery team"...
To give credit where credit is due, the father-son machinist team cranked out some fine work. The adapter just happened to be one of those items that wasn't in their fine work category.

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Old 07-07-2012, 12:22 PM   #7
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So, who won?
Alcohol was involved. It was a blurry finish for them, and not me.

I did get the opportunity to repair the R69US engine. Two pushrods and gaskets had the bike back rolling along. The bike now resides in storage in a northern Ohio basement.

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Old 07-07-2012, 01:08 PM   #8
Bill Harris
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To give credit where credit is due, the father-son machinist team cranked out some fine work. The adapter just happened to be one of those items that wasn't in their fine work category.

Carl
And no disrespect intended. In this CNC age a hand-tapped sheet metal adapter is a work of art.
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Old 07-15-2012, 01:50 PM   #9
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ouch...

The aftermath on a BMW R69S engine case when a rider decides to race a Vincent. The BMW rider 'thought' installing a 20207 barrel bearing front and rear on the crankshaft would help 'achieve' greater RPM for racing!







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