What's wrong with this picture? R50S

norton73 · 01-07-2011, 07:41 AM

Vierventilköpfe für BMW R50S

Click on the pics for close ups.

Pretty damn cool!

Sniper X · 01-07-2011, 07:44 AM

Can you give me a hint or just outright tell me?

bmwloco · 01-07-2011, 07:44 AM

Looks like good clean track hooligan fun to me... just wear your leathers and a damn good helmet.

norton73 · 01-07-2011, 07:45 AM

Quote:

Originally Posted by Sniper X

Can you give me a hint or just outright tell me?

Look at the heads

Sniper X · 01-07-2011, 07:50 AM

Are they Krausers with stock covers or modified stockers?

DaveBall · 01-07-2011, 08:06 AM

Nothing wrong with 4 valve heads. Might be Krauser or Luftmeister heads, or something totally different. Looks like a good design to me.

Carl · 01-07-2011, 08:14 AM

Two words: all custom.

Carl

Uncle Ernie · 01-07-2011, 08:44 AM

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?

Tim McKittrick · 01-07-2011, 11:33 AM

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.

SlackerSteve · 01-07-2011, 12:00 PM

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.

Houseoffubar · 01-07-2011, 12:04 PM

How do you install the roller bearing crankshaft into the case with the rods already installed?

Carl · 01-07-2011, 12:16 PM

Quote:

Originally Posted by Tim McKittrick

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.

Carl

Lornce · 01-07-2011, 12:37 PM

Cool!

RecycledRS · 01-07-2011, 12:55 PM

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.

Caddy82rats · 01-07-2011, 01:06 PM

SUPERB work

01-07-2011, 07:41 AM	#1
norton73 ^OP drinkin' Joined: Dec 2003 Location: Beautiful Downtown Springville, Alabama Oddometer: 8,075	What's wrong with this picture? R50S Vierventilköpfe für BMW R50S Click on the pics for close ups. Pretty damn cool! __________________ Loose nut holding the handlebars He’s one of those who knows that life is just a leap of faith. Spread your arms and hold your breath, always trust your cape. Guy Clark "The Cape"

01-07-2011, 07:44 AM	#2
Sniper X De Oppresso Liber Joined: Jul 2006 Location: Central New Mexico, 7420ft above sea level Oddometer: 30,423	Can you give me a hint or just outright tell me? __________________ "I claim to be frightened of horses but do so only to get out of attending parades. It's peculiar but ...it works. The Horses get it. RESISTANCE IS NOT FUTILE. IT'S VOLTAGE DIVIDED BY CURRENT

01-07-2011, 07:44 AM	#3
bmwloco Studly Adventurer Joined: May 2008 Location: AsheVegas NC Oddometer: 973	Looks like good clean track hooligan fun to me... just wear your leathers and a damn good helmet. __________________ Pastor, Church of the Horizontally Opposed Air Cooled Twin '66 BMW R60/2, '83 BMW R100RS, '81 BMW R100RS "Das Beast", '77 Honda XL125 Airhead #371 bmwloco screwed with this post 01-07-2011 at 07:51 AM

01-07-2011, 07:50 AM	#5
Sniper X De Oppresso Liber Joined: Jul 2006 Location: Central New Mexico, 7420ft above sea level Oddometer: 30,423	Are they Krausers with stock covers or modified stockers? __________________ "I claim to be frightened of horses but do so only to get out of attending parades. It's peculiar but ...it works. The Horses get it. RESISTANCE IS NOT FUTILE. IT'S VOLTAGE DIVIDED BY CURRENT

01-07-2011, 08:14 AM	#7
Carl ,,, Joined: Oct 2001 Location: South Tejas Oddometer: 683	Two words: all custom. Carl __________________ http://www.flyingtpot.com/

01-07-2011, 08:06 AM	#6
DaveBall Studly Adventurer Joined: Sep 2009 Location: Vancouver Island Oddometer: 932	Nothing wrong with 4 valve heads. Might be Krauser or Luftmeister heads, or something totally different. Looks like a good design to me.

01-07-2011, 08:44 AM	#8
Uncle Ernie Beastly Adventurer Joined: Jul 2007 Location: Asheville NC Oddometer: 3,978	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? __________________ LOOK OUT IT'S COMING THIS WAY!

01-07-2011, 11:33 AM	#9
Tim McKittrick Beastly Adventurer Joined: Dec 2003 Location: Wasilla Alaska Oddometer: 1,446	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.

01-07-2011, 12:00 PM	#10
SlackerSteve Homely Adventurer Joined: Feb 2008 Location: Further... Oddometer: 452	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. __________________ When you create with your brain, it is work When you create with your heart, it is craft When you create with your soul, it is art

01-07-2011, 12:04 PM	#11
Houseoffubar fine beer sampler Joined: Dec 2010 Location: Bothell, Washington Oddometer: 1,534	How do you install the roller bearing crankshaft into the case with the rods already installed? __________________ Performance Welding Service 1978 R100/7 Build thread 1915 Boardtrack racer replica (Electric Powered) Lots of bicycles Hemp: The strongest natural fiber in the world, and the most nutritious plant on earth.....why is this illegal again?

01-07-2011, 12:37 PM	#13
Lornce Lost In Place Joined: Aug 2003 Location: Way Out There. Oddometer: 15,983	Cool!

01-07-2011, 12:55 PM	#14
RecycledRS Along for the ride Joined: Nov 2008 Location: Vancouver Island Oddometer: 912	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. __________________ __________________________________________ "There's a fine line between a skinning and a shearing"

01-07-2011, 01:06 PM	#15
Caddy82rats Beastly Adventurer Joined: Mar 2007 Location: South France Oddometer: 1,075	SUPERB work

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