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Can you date valve covers by type?


kiva667
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Rather than continuing to hijack another thread, I thought I would ask a separate question as a new topic:

Were the three different styles of valve covers produced chronologically? I hit the search function but found nothing on this.

Early - no ribbing, only "BMW" the cover.

Middle - ribbing plus "BMW" aft of the filler hole

Later - ribbing plus roundel

Did the production of each one correspond to exact years? Or were there years when more than one of the types was used?

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I can't really help you with any of your questions, but I think it's interesting how many variations of the valve covers there are. Take these two for example. 

 

Here you have the roundel forward of the oil cap (this is the valve cover that I have). 

 

post-48014-0-90038400-1425098618_thumb.j

 

And here you have the roundel behind the oil cap!!

 

post-48014-0-14275500-1425098647_thumb.j

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.....Did the production of each one correspond to exact years? Or were there years when more than one of the types was used?

I haven't a clue as to these answers but it sounds like a great "research project," especially since the casting dates would provide a clear chronology. I'm not volunteering but I'm subscribing!

I'll bet trends would emerge if you collected images of 50 valve covers along with their dates. And there are LOTS of these covers around that aren't bolted on cars!

Regards,

Steve

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Turn the valve cover over to reveal the part stamping date (not necessarily the month/year of your car)

 

Valve covers used on tii's have a short vent tube required to clear the intake manifold plenum.  

Please excuse the dead bug

c17626da.jpg

 

e21 M10 (possibly others) valve covers have a machined surface with (2) threaded holes for securing an emissions-related device

 

Here is the engine bay of Matthew Cervi's 73tii (with a later valve cover)

Vintage2008Meet058.jpg

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Kiva667 is beyond the casting date issue -- an issue I noted in passing in the current '74 Euro '02 for-sale thread -- and asking, I believe, to what extent we can "date" the valve covers WITHOUT pulling them off. Apart from the tii issue, there are at least 4 styles of '02 valve covers for carbureted cars. More? Lots more?

OK. I am NOT volunteering for this project but perhaps those interested could post on this thread a photo of their valve cover(s) along with a photo of the casting date for that valve cover. There must be a dozen members here who have 5 to 10 spare valve covers sitting on a shelf! And...adjusting your valves this weekend? Well, just snap a couple photos and post them here!

Pictured below, my spare cover for my April '76-manufactured car is probably April '76, although my nubs are a little disorderly! Zundfolge at rear of cover, roundel at front of cover.

Regards,

Steve

post-41123-0-17640100-1425131918_thumb.j

post-41123-0-59146200-1425131933_thumb.j

Edited by Conserv
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I can't really help you with any of your questions, but I think it's interesting how many variations of the valve covers there are. Take these two for example. 

.....

 

But you MAY be able to help with this question! Are these spare valve covers? If so, how about re-posting these two photos, each followed by a photo of their casting date?

Regards,

Steve

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It would be nice to know whether or not a valve cover is likely original without having to remove it. For example, I last had my cover off a couple of months ago but am not a fan of "fixing" things if they're not broke, so I am not inclined to remove it again just to look at the casting date.

Since I am also a fan of keeping things stock - within reasonable limits - it would be fun to know if my valve cover fits the year of the car. If it definitely does not then I will have to keep my eye out for a reasonably priced early cover. I've noticed that when they do come up for sale they tend to be on the expensive side. And while we know that some 1967 cars came with the early smooth valve cover, there is no certainty at this point that they all did.

post-38342-0-45167200-1425136832_thumb.j

Edited by kiva667
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But you MAY be able to help with this question! Are these spare valve covers? If so, how about re-posting these two photos, each followed by a photo of their casting date?

Regards,

Steve

I would but I got these two images from a Google image search. They are not mine unfortunately. My valve cover is the same as the top picture though.

Sent from my abacus using precise finger movements......

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