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Old 01-07-2011, 07:41 AM   #1
norton73 OP
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What's wrong with this picture? R50S

Vierventilköpfe für BMW R50S

Click on the pics for close ups.

Pretty damn cool!
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Old 01-07-2011, 07:44 AM   #2
Sniper X
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Can you give me a hint or just outright tell me?
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Old 01-07-2011, 07:44 AM   #3
bmwloco
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Looks like good clean track hooligan fun to me... just wear your leathers and a damn good helmet.
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Old 01-07-2011, 07:45 AM   #4
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Can you give me a hint or just outright tell me?
Look at the heads
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Old 01-07-2011, 07:50 AM   #5
Sniper X
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Are they Krausers with stock covers or modified stockers?
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Old 01-07-2011, 08:06 AM   #6
DaveBall
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Nothing wrong with 4 valve heads. Might be Krauser or Luftmeister heads, or something totally different. Looks like a good design to me.
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Old 01-07-2011, 08:14 AM   #7
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Two words: all custom.

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Old 01-07-2011, 08:44 AM   #8
Uncle Ernie
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Who said that's an "S"? Not anymore. Anyway- it's got the wrong rocker covers for an "S".
Am I to believe he put a spark plug in the middle? Is that even possible?
Why not just do a dual plug get-up? And if that IS an "S", it seems dumb to ruin a useless but never-the-less valuable lump when you could have found a normal 500 for cheap. I mean, the "S" was a little faster, but faster than what? A 12yo on a Schwinn Sting Ray?
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Old 01-07-2011, 11:33 AM   #9
Tim McKittrick
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That's an amazing piece of work- custom heads, crank, rods, and pistons to make a higher revving motor with a modern 4-valve head design. Low domed pistons, narrow included valve angle, centralized plug.... I'd love to see a dyno chart on his final tuning results. This could be a 70 HP mill or better.
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Old 01-07-2011, 12:00 PM   #10
Detroit Steve
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It is a lovely machine with all kinds of fancy machining.


I am wondering at the wisdom of the square slots ventilating the clutch area. This is not the first old BMW race bike where I have seen this, I just wonder why.
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Old 01-07-2011, 12:04 PM   #11
Houseoffubar
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How do you install the roller bearing crankshaft into the case with the rods already installed?
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Old 01-07-2011, 12:16 PM   #12
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Quote:
Originally Posted by Tim McKittrick View Post
That's an amazing piece of work- custom heads, crank, rods, and pistons to make a higher revving motor with a modern 4-valve head design. Low domed pistons, narrow included valve angle, centralized plug.... I'd love to see a dyno chart on his final tuning results. This could be a 70 HP mill or better.
No matter which HP rating you're using, an increase to 70HP is a stretch for that engine which is ~500cc and has just those mods. My comment here in no way pans the devotion they've placed in their design. The doubling of horsepower on 55-69 BMW twin engines is serious biz.

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Old 01-07-2011, 12:37 PM   #13
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Cool!
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Old 01-07-2011, 12:55 PM   #14
RecycledRS
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Very nice work!
Its called an R50S but the bore and stroke work out to 896cc. If true I think he may well get much more than 70 hp.
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Old 01-07-2011, 01:06 PM   #15
Caddy82rats
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SUPERB work
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