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  1. #1
    Registered User b25bsaboy's Avatar
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    Cylinder Head Identification

    Good afternoon to everyone,

    Several week's ago I bought a collection of parts for Airheads and Norton Commando parts. There was more Norton parts than Airhead but in the |pile I came up with a dirty pair of double plugged BMW Airhead Cylinder Heads. They were dirty as H*#l and took them and got them Vapor Cleaned at a local shop here in Calgary. The difference is amazing, but I have no idea what these heads will fit, thus I am asking if anyone has any idea what I have?
    On the inside where the valves are it is stamped 30/22.
    Attached Images Attached Images
    Last edited by b25bsaboy; 10-26-2017 at 01:39 PM.
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 1992 R100RT, 2009 R1200RT

  2. #2
    Liaison 20774's Avatar
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    Well, they're obviously dual plugged. I see the date stamp of '77, so my guess is they're likely 1977 R100/7 heads. Here's a link to the heads on my '78 R100/7 after refurbishing:

    https://forums.bmwmoa.org/showthread...l=1#post854525

    The mold number on my heads appears to be a higher number than yours, so that's why I think they're for 1977. I'm not sure I'd know if they were R75/7 heads, though.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
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    I've got a set of spare heads that came from a 78 R100/7.
    Hope it helps.
    Steve

    20171026_185950 (Medium).jpg

    20171026_190018 (Medium).jpg

  4. #4
    Registered User STEVENRANKIN's Avatar
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    Serial number?

    Is that the serial number on the heads? The microfiche for BMW parts should be of help. St.

  5. #5
    Liaison 20774's Avatar
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    No serial number or part number on the heads. As a general rule, BMW never puts part numbers on parts. The number you do see in the figures is a mold number for which there is no information about.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  6. #6
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by STEVENRANKIN View Post
    Is that the serial number on the heads? The microfiche for BMW parts should be of help. St.
    Thank you for the comment, but Kurt is right about BMW not putting parts numbers on castings. What you do see is a foundry forging number.
    In comparing my heads on the other heads under my comment, it stricks me that the two heads are a matched pair.
    If you look at the L10 - R10 (left and right side)
    1 263 947 (L10((left side)) and 1 263 947 (R10((right side))?
    SiCu is a foundry metallurgical # of what the head material is?
    Si - Silicon, and Cu - Copper which is mixed in with the aluminum for heat treating to stress relieve?
    Last edited by b25bsaboy; 10-26-2017 at 02:53 PM.
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 1992 R100RT, 2009 R1200RT

  7. #7
    Liaison 20774's Avatar
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    The L10 and R10 probably indicates they are 1000cc heads. The SiCu does represent something about the aluminum alloy. I found an old post by Oak where he said the silicon was approximately 8% and the copper was approximately 3.5%. Oak was a metallurgist.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  8. #8
    B Reams brook.reams's Avatar
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    Quote Originally Posted by b25bsaboy View Post
    Good afternoon to everyone,

    Several week's ago I bought a collection of parts for Airheads and Norton Commando parts. There was more Norton parts than Airhead but in the |pile I came up with a dirty pair of double plugged BMW Airhead Cylinder Heads. They were dirty as H*#l and took them and got them Vapor Cleaned at a local shop here in Calgary. The difference is amazing, but I have no idea what these heads will fit, thus I am asking if anyone has any idea what I have?
    On the inside where the valves are it is stamped 30/22.
    Here are pictures of my heads from my 1977 R100RS. The casting number matches yours. I'd call that good for identifying them as 1977 R100 heads.

    IMG_8370.jpg

    IMG_9130.jpg

    Best.
    Brook Reams.
    Brook Reams - Arvada, CO
    Endeavor to Persevere
    Various Two-wheeled Vices, All BMW
    2004 R1150-RS||2002 F650-GS||1983 R100RS||1977 R100RS||1975 R75/6||1973 R75/5

  9. #9
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by brook.reams View Post
    Here are pictures of my heads from my 1977 R100RS. The casting number matches yours. I'd call that good for identifying them as 1977 R100 heads.

    IMG_8370.jpg

    IMG_9130.jpg

    Best.
    Brook Reams.
    Thank you Brook!
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 1992 R100RT, 2009 R1200RT

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