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dBDawg
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VBMWMO #8575
Joined: 01/18/2013
Posts: 53

I'm having a hard time discerning if the magneto I have with my engine will work. It doesn't seem to be the correct one according to whatever specs are online for an R11 S5 (Bosch B 245 RS or magneto generator D 2 BRS 167) or R62. The other problem is I'm not exactly sure which series engine I have. I've been going thru older posts here as well trying to make sense of it all.

Here's the info I have:

engine #: 60126 (located on driver side Right under BMW logo) (It also has a plate between engine and transmission
Magneto #: Robert Bosch Germany: DVRS4/1 (smaller number: B32-189S51)

The timing is geared NOT chain. What I've gathered is the direction of rotation matters, so I was wondering if anyone knows what direction it has to turn with this engine as well general output compatibility. There's an arrow pointing to the right on the front of the magneto above the gear.

It fits in the engine perfect, so it would appear to be correct, but I don't want to waste money rebuilding something that won't work.

Thanks for any help...

  • bmw_r11_s5_-_engine_magneto1.jpg
  • bmw_r11_s5_-_engine_magneto2.jpg
  • bmw_r11_s5_-_engine1.jpg
Ian R11
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VBMWMO #8148
Yorkshire uk
Joined: 10/22/2011
Posts: 199
The magneto for a gear driven

The magneto for a gear driven R62/11 engine would spin anti clockwise viewed from the front, opposite to what yours indicates. The retard lever would also indicate it operates in the wrong direction for your engine. Ask BMZ if it can be rebuilt to work in the opposite direction.

The series and number 60126 is confusing and could be wrong. Although indicating series 1 the separate flywheel/clutch cover plate were fitted after S1. The engine should also carry a number under the right barrel on the lower half of the casting. If it’s there, what is it?

beemererik
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VBMWMO #5720
Joined: 10/27/2006
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One easy way to determine if

One easy way to determine if it is right spin or left spin is to look at the points plate located under the bakelite points cover, they have a L or R embossed. Since it is gear driven, I suspect the R11 is supposed to have a left spin magneto. You can't always trust the arrow on the front of the mag as the internals can be swapped.

Erik

  • img_5684.jpg
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dBDawg
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VBMWMO #8575
Joined: 01/18/2013
Posts: 53
Ok. great info to know.

Ok. great info to know. Thanks guys. Ian, here's a pic of the engine numbers I think you're referring to. Basically looks like this on both halves:

1
75

Let me know if that means anything to you.

BTW, have you guys heard anything of these:

http://www.powerdynamo.biz/eng/systems/7195/719520main.htm

I know the purists at hand would probably throw me out to the wolves for even mentioning it but was just curious if there was any opinion or review of the performance.

Thanks

  • engine_numbers_halves.jpg
Ian R11
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VBMWMO #8148
Yorkshire uk
Joined: 10/22/2011
Posts: 199
The number in your photo show

The number in your photo show the crankcase halves match. Is there a 5 digit number directly under the right cylinder above the running board line? Both my engines from this period have one and it matches the engine number in the usual place on the flywheel housing.

I fitted a Powerdynamo system on another bike and it works very well. Have you seen their ignition unit for the R11? I don’t have any experience with it. Have you tried to contact BMZ about rebuild of yours? I bought parts from them around 18 months ago but believe from an earlier posting by Erik, he wasn't getting a reply from them recently.

Performance…. Figures state 62mph for single SUM carb machines and I believe 68mph for twin carb machines. My optimistic speedo says nearing 140kph! while it feels like 140, mid 60’s mph on the flat is corrected speed, but your not going to stop quickly if needed.

My view of performance…. adequate and fun on the right road.
I don’t take it on faster roads as its easily swallowed up in cars wanting to run at 60 or more mph. Traffic congested roads are hard work, but its performance is ok on winding back roads where traffic runs 30 to 50mph. If there is no other traffic or kamikaze sheep around it is happy and comfortable to cruise along at 55mph. It doesn't like bumpy bends, the frame seems rigid in a straight line but seems to flex more in a corner than the tubular framed bikes. I cover anything from 15 to 150 miles up and down gradients as steep as 1 in 4 on a run and it copes very well.

Performance of my R62 with similar engine but different carb is very different. It has more low to mid range power, possibly 15 to 20%, but the SUM powered bike becomes stronger at higher speeds.

jrapose
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VBMWMO #8617
Joined: 02/12/2007
Posts: 263
Powerdynamo.de

I import Powerdynamo ignition systems into the USA.... and I can say they are a First Class group of folks to work with, and yes they have replacement magnitos, although I have never seen one... they probably work just fine but would not look at all like the original.
There is a shop in Quincy Calif. that rebuilds radial aircraft engines and I know they restore magnitos... I am no help
for you, If you are building a show bike I would insist on having the absolute original mag, and not a replacement .... if it is a rider then that is a different deal all together...besides 99 or of 100 people would not be able to tell if it was proper or not....

Joel Rapose
Powerdynamo sales
www.rapose.biz

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Joel Rapose
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VintageSalesand...
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VBMWMO #7368
Corona, CA
Joined: 03/24/2008
Posts: 295
Motor details

I'm curious - What's with the spigots on the exhaust ports? and the shaft sticking out of the front of the motor?

dBDawg
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VBMWMO #8575
Joined: 01/18/2013
Posts: 53
I've been busy buying a home,

I've been busy buying a home, so got a bit side tracked.

At some point someone extended the crank out the front. probably to run a generator or something. That's my assumption. I have no idea why the exhaust has the spigots.

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