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Thread: 906/Carrera 6/911R motors - characteristics

  1. #61
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    More measurements, other 906 ATE OEM valves...

    Yes, not the most accurate tool, but what I had handy.

    906 Twin Plug Heads ATE Int Exh Valves - Photo 09.jpg

    906 Twin Plug Heads ATE Int Exh Valves - Photo 10.jpg

    Not my measurements. Ended up buying these valves also.

    906 Twin Plug Heads ATE Int Exh Valves - Photo 11.jpg

    906 Twin Plug Heads ATE Int Exh Valves - Photo 12.jpg

    NOS? Looks like it to me...

    906 Twin Plug Heads ATE Int Exh Valves - Photo 13.jpg

    906 Twin Plug Heads ATE Int Exh Valves - Photo 15.jpg

    The top of the stem appears to have never been ground-down

    906 Twin Plug Heads ATE Int Exh Valves - Photo 14.jpg

    PS: The 'lash-cap' valves I believe are actually longer than those used with adjustable rocker arms. Maybe someone else can confirm this.

    PSS: By chance, does anyone have a single 906 Mag Upper Valve Cover laying around? Gordon?

    Like this...

    906 Mag Upper Valve Cover pn 901.015.115.10 ONE ONLY.jpg

  2. #62
    Member #226 R Gruppe Life Member #147
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    69S valves are like 113mm, defintly longer than lash cap valves. G

  3. #63
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    Quote Originally Posted by gled49 View Post
    69S valves are like 113mm, defintly longer than lash cap valves. G
    Well, that answers that question. I didn't have any lose street valves here to compare to the 906.

    Here is something some of you might find useful, not 906, but good reference to have nonetheless.

    911 RSR Valve Specs (which also use lash-caps).

    911 RSR Intake Valve Specs - for NLA OEM ATE.jpg

    Note the RSR valve length of the Intake (112m) vs. the Exhaust (110mm)

    911 RSR Exhaust Valve Specs - for NLA OEM ATE.jpg
    Last edited by 914-6gt; 04-24-2018 at 07:55 PM.

  4. #64
    Drove R4 on the street...definitely didn't need to slip the clutch, and "banshee scream" is definitely right. I found it to be "steerable," but there wasn't much squirt down low. There was a lot of scream with so-so power (by modern standards) up top. I'd say a 2.2, 2.3, or 2.5 is a better choice for anything other than an original R. They're just better engines in a light car, and feel quite a bit faster to me. Just my take.*

    *Then again, I am not sure I have ever heard a scream through the woods like I did as Patrick Long made repeated passes for the camera...

  5. #65
    Love this threads !!!
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    Youngtimers aircooleds burrow in Mallorca island....

  6. #66
    So it looks as if the 906 Valves are the same length as those used in the standard 901/01 engine which were 111.15 on the inlet and 111.75 on the exhaust.

    The later valves on the S engines were 114.0 on the intake and 113.5 on the exhaust and I wonder why unless it is to deal with swivel adjuster changes ?

    The Workshop Manual only reflects this change of length on the 2.2 engines but the 'Spec books' show this change happened on the 1967 'S'

    I have the part numbers for the RSR valves but can't find any other details.

    I will have to set up a carrier and check.
    Last edited by chris_seven; 05-16-2018 at 09:47 AM.

  7. #67
    Member #226 R Gruppe Life Member #147
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    Just to help the info:
    911R probably cut a little, used, flat face intake
    69S new, dished intake
    2.2-2.7 used
    RSR new, flat face intake
    Attached Images Attached Images

  8. #68
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    While searching for a pair of the 906 Mag upper covers I need, I found this ��

    20180518_135346.jpg

    20180519_144800.jpg

    And here is the one Mag 906 piece...

    IMG-20180515-WA0007.jpg

    So the 935 found its covers basic design in the roots of the Carrera 6. Very cool...
    Last edited by 914-6gt; 05-19-2018 at 09:29 PM.

  9. #69
    I have an original sand cast mag 906 engine case numbered as a spare if anyone is looking for one to complete their 906. Please see my site http://www.Porsport.com Thanks
    Last edited by Rennman; 05-29-2018 at 06:20 PM.

  10. #70
    Quote Originally Posted by 914-6gt View Post
    While searching for a pair of the 906 Mag upper covers I need, I found this ��

    20180518_135346.jpg

    20180519_144800.jpg

    And here is the one Mag 906 piece...

    IMG-20180515-WA0007.jpg

    So the 935 found its covers basic design in the roots of the Carrera 6. Very cool...
    You bought the one on Pelican, eh?
    -Marco
    SReg. #778 OGrp: #8 RGrp: #---
    TLG Auto: Website ... Blog ... Facebook Page
    Searching for engine #907495 and gearbox 902/1 #229687

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