Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 34

Thread: First use date of Pirelli CN36 185 70 VR speed rating on longhoods before used in RS

  1. #11

  2. #12
    Oil Cooled Heart Bullethead's Avatar
    Join Date
    Jul 2008
    Location
    South Florida
    Posts
    2,195
    Quote Originally Posted by Darren65 View Post
    Interesting to note the tyre in this video....

    https://www.youtube.com/watch?v=KVU3...ata_playerhttp
    Yup, and note that was filmed in 1973...
    Russ

    ESR # 1537

    '62 356S Notchback Hotrod
    '67 S Das Geburtstagsgeschenk
    '68 T Targa Sportomatic
    '68 L SW Targa Sportomatic
    '70 914/6 GT

  3. #13
    Senior Member
    Join Date
    May 2012
    Location
    UK
    Posts
    2,720
    Thanks for input chaps.

    Agree. If it is excerpt from the full “one for the road” P+A corporate video pretty sure that video shows the 73 Daytona RSR winner of feb 73 race already back in Germany and iirc saw a single bolt fan strap so probably spring 73 or later ? I previously posted in forum a snippet from a 73 publication announcing the new film was being shown in U.K. showing date October 1973 having premiered at that year’s the 18th Parade:
    Name:  40920275-49CD-4C05-AA4A-6E5C5DAD361F.jpeg
Views: 307
Size:  102.6 KB


    Steve
    Last edited by 911MRP; 06-02-2020 at 02:25 PM.

  4. #14
    Serial old car rescuer Arne's Avatar
    Join Date
    Aug 2011
    Location
    Eugene, OR
    Posts
    1,956
    Data point - 11/71 Fuchs with 51st week of 71 tire...

    NOS Fuch 6x15 with NOS tire
    - Arne
    Current - 2018 718 Cayman, Rhodium Silver, PDK

    Sold - 1972 911T coupe, Silver Metallic; 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic

  5. #15
    Senior Member
    Join Date
    May 2012
    Location
    UK
    Posts
    2,720
    Thanks for the update Arne.

    If I’m reading photo correctly another veith pirelli cn72 (not cn36) that might be factory original fitted to a 911 or at least a very early replacement

    So far the ( limited) evidence surfacing is pointing more towards CN72 being the type Pirelli used into longhood era on My 72 or later even though cn36 type paralleled the CN72 maybe the former not available in the specific 1857015 VR format and speed rating required for 911?

    Clearly cn36 185 70 vr 15 was available for front 6 inch fuchs of every RS by the winter of calendar 72 .. but before that ?

    Steve

  6. #16
    Serial old car rescuer Arne's Avatar
    Join Date
    Aug 2011
    Location
    Eugene, OR
    Posts
    1,956
    Quote Originally Posted by 911MRP View Post
    Thanks for the update Arne.

    If I’m reading photo correctly another veith pirelli cn72 (not cn36) that might be factory original fitted to a 911 or at least a very early replacement
    Steve, using my experience with date codes from my first 20+ year career in tires (in the late '70s through '98), I'd hazard a wager that the tire in quest is original fitment, not an early replacement. The match up of the dates is too close - November 1971 for the Fuchs wheel, and late December 1971 (51st week of 1971) for the Pirelli tire. The wheel has never been bolted on a hub (note the unmarked lug seats), and the wheel weights are typical German weights that were difficult - if not impossible - to come by in the US in those days.

    So I'd say this is a pretty safe indication that CN36 had not supplanted the CN72 as original fitment through very early '72 built cars. Can't extrapolate farther than that, of course.
    - Arne
    Current - 2018 718 Cayman, Rhodium Silver, PDK

    Sold - 1972 911T coupe, Silver Metallic; 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic

  7. #17
    Member
    Join Date
    Sep 2008
    Location
    Chadds Ford
    Posts
    63
    I have the original spare for my 72 T and it has a CN36 on it. The build date is 6/72.

    Name:  a1a.jpg
Views: 317
Size:  89.3 KBName:  a2a.jpg
Views: 311
Size:  88.5 KBName:  a3.jpg
Views: 311
Size:  82.8 KB

  8. #18
    Senior Member
    Join Date
    May 2012
    Location
    UK
    Posts
    2,720
    Interesting input Don. Now that seems to be a datapoint giving insight into cn72 /cn36 supercession date. Yours is 13 March 72 tyre if I’m correctly decoding 112 DOT code as week 11 of 1972. Suggests a supply lead circa 2 months to get cover on wheel and a month more for wheel/tyre put as spare of a June 72 produced car.

    That is earliest CN36 I’ve seen on 911 so far. I can see from photo it is one of the tube type so does strongly point to that DOT third digit 2 being from 70 decade ( 1972) not decade 80s (1982). Latter I inderstand would be tubeless.

    Does your sidewall mention the matierial used in construction of your example — I assume it is fabric not the later steel radial type used by Porsche from December 74?

    Incidentally regarding other part of question: timing vis a vis use on RS, your 572? May 72 wheel date stamp on the Fuchs of your model year 72 car and my own model year 73 RS are actually very close indeed! Not sure how well known it is that the earliest genuine RS with the famous coloured 6/7 inch Fuchs have date stamps that are a quite number of months before the car’s date of production — I don’t know when the cn36 tyres got fitted to those rims. Obviously RS had additional loop to swap wheels and tyres post weigh scales visit.

    Cheers

    Steve
    Last edited by 911MRP; 06-05-2020 at 01:35 PM.

  9. #19
    Member
    Join Date
    Sep 2008
    Location
    Chadds Ford
    Posts
    63
    I agree with the tire timeline. Yes it is a 2ply rayon tire and you are correct it is a tube tire.

  10. #20
    Senior Member
    Join Date
    May 2012
    Location
    UK
    Posts
    2,720
    Found the matching Veith Pirelli booklet with vehicle fitment information being small pocket size it had slipped between two bigger books on my shelf.

    It doesn’t shed light on the question at hand as looks backwards to earlier model years:

    Name:  A24FD4E2-EABC-4DF7-AC0E-6BB1972A1B51.jpg
Views: 272
Size:  52.9 KB

    Nevertheless I’m sharing a few snippets from my reference booklet for folks in the ESR community who might be interested in such historical contents from the German Subsidiary of the Pirelli company who were evidently a supplier to the Porsche factory back in the day:

    Name:  CAC29415-9FB5-4CC5-B7DD-F652583AFF28.jpg
Views: 267
Size:  117.0 KB
    Name:  F4232CA4-AEE0-486B-8C0D-8C2F6A25958E.jpg
Views: 288
Size:  105.9 KB
    Name:  E0A5B3A6-ED4F-4E8F-A2A5-4CB199023768.jpg
Views: 275
Size:  94.9 KB

    This is for historical interest only it may not represent latest standards and regulations so consult with suitably qualified specialist in your country and region regarding safety critical matters.

    There are folks with more experience of selling tyres than I do.

    Steve
    Last edited by 911MRP; 06-06-2020 at 06:32 AM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.