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EuroIron
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VBMWMO #7266
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I'm sure there must be some historical or technical bits to be gleaned.

Darryl.Richman
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VBMWMO #6285
Surf City, USA (Santa Cruz, CA)
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1939 R66 on Ebay

Is this R66 yours?

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EuroIron
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VBMWMO #7266
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1939 R66 on Ebay

yes

Darryl.Richman
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VBMWMO #6285
Surf City, USA (Santa Cruz, CA)
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1939 R66 on Ebay

I like your sense of humor, with the cylinders and heads on the Harley bottom end. Isn't it tough to squeeze an intake manifold in there?

If I had some loose change jangling in my pocket I'd probably bid on it. You just don't see R66s coming down the road very often. But it sure looks like a lot of work for somebody.

What's that number on the steering head? Isn't there a number on the right top plunger mount?

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EuroIron
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1939 R66 on Ebay

it's not any tighter than the plumbers junk on a stock flatty and the intake ports could use some raising anyhow which would make the angle of convergence more favorable for reverse engineering a tuned intake for it

I'll see if I can round up some intake and exhaust fabrication pix of things I've done........ this would be pretty easy and straight forward compared to some previous projects but there is another similar Kraut topend that will go even easier with respect to the valve train

I'd down draft this one although there is a certain Indian lower I think these would go on easier, I just don't have any laying around to easily try.

fwiw...... I have a normally aspirated 45 inch antiquated flathead that cruises over 80 and has topped 100 mph...... I built it's engine and not much inside it is stock or antique... I even ground my own cam lobes...... I'd really love to build a fast and reliable old beemer flatty

I have a couple 22 CID screw type superchargers from the Motherland...... think a pair of them would do an old boxer flatty just about right

btw, I got the club stuff in the mail yesterday, thank you. I just skimmed thru the Bulletin and found it enlightening.

On the sarcastic humor....... after being pitched to by several of the "would be wheels" in this small niche arena and reading some random opinions of those in icon status......

well I find it amusing that within 24 hours I already have serious offers of more than three times what some of those guys tentatively offered and surely wouldn't have paid once it came down to green changing hands for oxide

frankly, I've found most of them so arrogant and pious that I just politely dismiss them while they are still going on and on about being burning bushes and the whole time unloading their proverbial glock in their proverbial foot

I've really no idea why any of them would feel comfortable talking to me like I'm a dolt or mentally unsound

One of my recent favorites has been Abbott and Costello, Abbott was announced and Costello wasn't..... I didn't like that and Costello seemed like a Fed/LEO if you were to ask me....... anyhow, they spent longer eating lunch/discussing than they did looking at a very large lot of parts and then instead of making an offer like Abbott said he would..... Costello wants to try a different tack

Really it amazes me, when I tell somebody I'll come look and make an offer....... that's exactly what I do. It's all good though, I'm prepared to hang onto all this stuff while summer gas prices dry up disposable income of good working people, or even much longer.

Drop by if you are ever in the neighborhood, Daryl. You are welcome at my humble hole in the wall shop, anytime, and thanks again for getting that package out so quickly as well as your assistance with the forum here.......

Darryl.Richman
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VBMWMO #6285
Surf City, USA (Santa Cruz, CA)
Joined: 10/27/2006
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1939 R66 on Ebay

Thanks for the kind offer! I don't know when I'll be back east again, I just drove my little pickup to Vech's rally in April (with my R52 in the back).

As experienced as you seem, you must have had these kinds of meetings before. Lots of people want to look, but not everyone has the cash handy. Heck, I'd love to look at your R66, too, but I've got 3 projects going on already and I bought a new bike this year, so I know the money and the time are just not there. And any smart buyer wants to find out how much the seller knows about what he has...

Anyway, good luck on your auction! With the prices on a restored prewar machine soaring, a nearly complete project bike has a lot of value, too.

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Darryl.Richman
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VBMWMO #6285
Surf City, USA (Santa Cruz, CA)
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1939 R66 on Ebay

I was looking at your auction again and noticed the Q&A at the bottom. I don't think it says CZ-80 on the motor, but OZ-80. OZ is oktanzahl, or octane number. The war time vehicles were all stamped (or cast) with this so that the motor pool would know what to put in it. OZ-74 was the standard and you'll see that cast into the high compression heads on R12s, for example.

If the bike was pressed into service in WWII, there will be a tiny stamp of the German eagle, with the Waffenamt (war bureau) dept. number. This stamp is about 1/4" square. On my R12, it fits comfortably in the middle cross of the W in the BMW cast above the serial number location. There were standard places to use it, but I have no idea where it goes on this motor.

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EuroIron
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VBMWMO #7266
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1939 R66 on Ebay

thank you and that makes more sense

the old man got this one from the east side of the wall and wasn't able to tell me much about it

The pic of the eagle isn't showing up and when I copied the properties and pasted into the browser, it wouldn't load.

I'd really like to see it but I'm searching for the eagle right now!!!

I may have just found one on the frame, have to carry it to the shop for careful cleaning to make sure, still haven't found on the engine but

it does have a small, lone, BMW rondel (about half the size of those with the engine numbers) on the left side of the engine just below that very large threaded inspection type cover and then there is a "K" stamped on the engine case close to the 2 oclock engine transmission bolt hole as indexed looking from the front. Still the proper left side and up high on a vertical surface.

Do you have any educated speculation or opinions regarding the frame numbers?

Thanks alot.

Yes I've had such meetings and gladly receive such persons who just want to look but I have little respect for people playing games and feel the need to operate under a false pretense, because it isn't necessary.

EuroIron
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1939 R66 on Ebay

Darryl, I cleaned BOTH plunger perches and nothing, so I put acid on them to see if anything could be lifted, nothing...... no signs of sanding, grinding, or stippling

I suppose the next step would be electronically peeking to see if any numbers had ever been stamped there

I guess I could have my blast guy take it to bare metal and he could do it in less than 24 hours

I suppose it wouldn't hurt to have him gently blast the engine cases now that the crank is turning and took very little effort to free

but I really wanted to offer it as it is because I know I prefer to see things I want to buy in the same, unsugar coated manner

Darryl.Richman
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VBMWMO #6285
Surf City, USA (Santa Cruz, CA)
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1939 R66 on Ebay

My ISP was down for a couple hours this morning; just back up at 10:30am PDT. The picture should show now, not that it's a particularly good one.

I don't know about the R66 specifically, but other prewar plungers had their frame number up on this right top mount. Postwar they moved it to the left top mount, for some reason. Your frame is definitely a prewar one, there's no vertical member just ahead of where the rear fender goes.

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EuroIron
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1939 R66 on Ebay

just forward of the serial number I see a "Y 12"* and on top of the engine, smaller than the engine font, and just behind the genny cradle, I see what may have been the eagle

cleaning it very gently and getting ready to swab it with acid to see if it lifts

* the "Y" is three bars at 120 degrees as opposed to the alpha symbol....... and these are stamped much deeper with thicker font than the fine line serial numbers....

thanks again, I updated the listing and added your site info as well as this one

I hope you don't mind me taking such liberties and btw....... how's the brew business going these days? I could put a barrel of some really fine triple bock to good use! Maybe I have some obscure bits you could as well.

Darryl.Richman
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VBMWMO #6285
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1939 R66 on Ebay

My R12 has a similar mark. It also is stamped with OZ-74. You may *just* be able to see this all in the photo:

The Y 10 mark is on the top, just ahead of the bell housing. I have no idea what the significance of this mark is.

You may be able to make out the OZ-74 stamp on the flat area above the followers.

There are other stamps that BMW put on the cases. For the split case motors like my R12, there are two numbers that are stamped on both halves on the front right side. I don't know what they mean, but they originally matched. Similarly, the crank webs have numbers stamped into the sides, and they originally matched and lined up. The /3 and /2 tunnel motors have the gear train offset stamped into the top of the case.

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EuroIron
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1939 R66 on Ebay

cast into the flange of one cylinder, right side, is "SMOP" and it also has stamped numbers

the left cylinder does not have these cast or stamped marks

and it has what appear to be skirt oiler holes drilled

Bruce Frey
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Texas Hill Country, USA
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1939 R66 on Ebay

My R5 motor is also stamped OZ 80 just as your is. I believe your engine number stamp is authentic with the BMW roundels before and after the number. My R5 has no other stamps that indicate military possession, either.

It was usual for the both the cylinders and heads to be stamped with the engine number (or an abbreviation of it), however, I have also seen cylinders and heads without them.....probably replacement parts. On the cylinders, the number is usually on the upper side of the flange where it bolts to the engine. The number on the heads is usually on one side of the upper edge near the valve cover. I will look through my pix and try to post some examples.

If you are lucky enough to have these stamps (they are sometimes hard to see) that match the engine number, that is a good bonus and I would add it to your auction info.

I think it is typical to have oiler holes only on one side.

Good luck! Your auctions add a bit of life to eBay.

Best regards,

Bruce

EuroIron
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VBMWMO #7266
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1939 R66 on Ebay

Thanks guys, I found Y only on the other side of the engine as well..... right next to the small rondel, and it looks like a post war rondel but careful measuring shows it to be different and obviously done with a very crisp and fresh stamp

weird stuff for sure and thanks again for all your help

EuroIron
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VBMWMO #7266
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1939 R66 on Ebay

tell me, what are those raked tree forks actually correct for?

I have some that do not have raked trees as well

I have several sets of forks and many in parts but I'm thinking these are the wrong ones....... and I have no idea why it would appear to need cable holders for what would appear to be a double sided brake drum

EuroIron
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VBMWMO #7266
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1939 R66 on Ebay
schrader7032
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VBMWMO #7032
San Antonio, TX
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1939 R66 on Ebay

I was expecting someone to crank up a pre-war BMW near the end of the video...just a bunch of crickets, however...?

Kurt in S.A.

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EuroIron
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1939 R66 on Ebay

you are correct, only crickets.........

appropriate, don't you think?

anyhow, so far it is looking like the R66 is being adopted

thank you guys for your help

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