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Jarama Tyres - a bit of research into originality - can you help?

Discussion in 'Lamborghini Front-Engined' started by Longstone Tyres, Jan 22, 2020.

  1. Longstone Tyres

    Longstone Tyres Karting
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    Feb 2, 2006
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    Dougal
    Hi

    I have just been in contact with a dealer who amazingly had 2 Jarama in stock, which i was very impressed by.

    It drove the question as to why i hadn't built a page about the Lamborghini Jarama, where i have covered the other Classic Lambos https://www.longstonetyres.co.uk/classic-car-tyres/lamborghini.html

    So i want to get my page as accurate as possible so:-

    when looking at the the Jarama it seems there have been 3 models
    • Jarama 350 GT (maybe 1970 - 1972) now i think this car fitted 205VR15 Cinturato CN72, at least untill some point in 1971. i think t hat because the Cinturato CN12 was not invented untill 1971 (i have also had suggestions that they came out in 1972, but Pirelli say 1971)
    • Jarama 400 GT 2 + 2. So 215/70VR15 Cinturato CN12. there is a great picture of old Feruccio leaning on a Jarama fitted with the CN12
    • Then i think there is a Jarama S (1973 - 1976) which i beleive also fitted 215/70VR15 CN12. (this car might also be called a Jarama GTS)
    My tyre pressure books make me think that they ran 35psi front and 38psi rear.
    then the Jarama S (or GTS ) 36psi front and 41psi rear.

    I realise that for some years the Pirelli wasn't produced, so most cars untill a few years ago will be fitting Michelin XWX, which of course is also a good tyre.

    If anyone knows any more or can correct my thoughts please let me know. Also any pictures that back up our research would be very greatfully appreciated.
     
  2. Peter K.

    Peter K. F1 Rookie

    Jan 9, 2004
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    Olivier will be able to give you confirmation.
     
  3. miurasv

    miurasv Formula 3

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    #3 miurasv, Jan 27, 2020
    Last edited: Jan 27, 2020
    There was no Jarama 350 GT, just the original GT, which produced a claimed 350 BHP, the figure of which is what you could be confusing, and the later GTS, also known as Jarama S, which produced a claimed 365 BHP. Both models had the 3929 cc engine.
     
  4. Longstone Tyres

    Longstone Tyres Karting
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    I wondered.

    I did see a reference for a Jamara 350 GT, but only in one book or on one web site, but can't find it now.
     
  5. miurasv

    miurasv Formula 3

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    #5 miurasv, Jan 28, 2020
    Last edited: Jan 28, 2020
    The Jarama models were only ever the 400 GT and the 400 GTS. Only the first Lamborghinis V12s were 350s such as the show protototype 350 GTV, which actually had no engine, and 350 GT that went into production that was subsequently replaced by the 400 GT.
     
  6. miurasv

    miurasv Formula 3

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    #6 miurasv, Jan 29, 2020
    Last edited: Jan 29, 2020
    The Jarama would always have been on low profile tyres due to the period introduced, whereas the Miura and Espada would have had full section 80 aspect ratio tyres when they were introduced, but received low profile tyres later. Low profile Pirelli Cinturato GR70 VR15 were used on the Jarama 400GT, which could well have been the HS CN12. Michelin XWXs may have also been used later on the Jarama 400 GTS in size 215 70 VR 15.
     
  7. Longstone Tyres

    Longstone Tyres Karting
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    Yep, that makes sense The CN12 came out in 1971, and that same 215/70VR15 CN12 was fitted to the front of the Muira SV https://www.longstonetyres.co.uk/catalog/product/view/id/5491/category/6441

    Then the SV fitted a larger rear 255/60R15 CN12 https://www.longstonetyres.co.uk/catalog/product/view/id/5363/category/6441 which at the time i think was the biggest tyre to be able to attain that speed rating.

    Pirelli did do an earlier low profile tyre in 1968 the CN36 https://www.longstonetyres.co.uk/pirelli-collezione/cinturato-cn36.html However we hope that that wasn't what they fitted, because Pirelli do actually make a 215/70VR15 CN12 now, but they don't make a CN36 in that size.

    Do you have any thoughts on tyre pressure?

    Are there any good period pictures?

    Do you know if Lamborghini did actuall fit XWX?
     
  8. miurasv

    miurasv Formula 3

    Nov 19, 2008
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    #8 miurasv, Jan 30, 2020
    Last edited: Jan 30, 2020
    Thinking about it, the Pirelli GR70 VR15 tyre would have been the CN73 as used on the Miura P400S. The Miura P400SV had front HS CN12 in size 215/70 x 15, but I'm quite sure the fronts were marked FR70 VR15 and rear 255/60 x 15 tyres marked HR60 VR15. Also, the Jarama came out in 1970, but the HS CN12 tyre didn't come out until 1971, as you said, so initially could not have used this tyre.

    Lamborghini were definitely using Michelin XWX for the LP400 Countach, 205 70 VR14 by 1974 so may well also have used the Michelin XWX in 215/70 VR15 on the Jarama S, and the Espada S3 which had the same wheels by this time.

    I don't know anything about the pressures.

    What is the difference between a Pirelli HS CN 72 and HS CN 73?

    We need someone with the Jarama and Jarama S Owner's Manuals to see what they say about the tyres.
     

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