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  1. #1
    Join Date
    Feb 2007
    Location
    Shanghai, China
    Age
    62
    Posts
    1,140

    Spring rates - Jag based cars with SB Chevy engine

    I have a Jag based kit (Unique Autocraft Python) with SB Chevy engine. Can any members advise what spring rates they use on the front and rear of their Jag based Cobras - mine are definitely too soft and I want to replace them over the winter.

    Thanks


    Regards
    Nigel B

    Unique Autocraft Python
    Chevy 350 ZZ4 TR3550
    Ex UK, Germany, Japan, UK and now back in Germany once again!!

    1972 Ford Mustang Mach 1 Cobra Jet
    351 Cleveland with 4 speed hurst shifter
    USA

  2. #2
    Join Date
    Feb 2007
    Location
    Stevenage, Herts
    Posts
    686

    RE: Spring rates - Jag based cars with SB Chevy

    Hi,

    With my SR the Spring rates are 450lb front (350SBC) and 200lbs each spring on rear but I have yet to road test and looks ok front but rear is touch high perhaps on lowest setting? Springs are on Spax dampers but are a few years old on the car so maybe any settling has happened, not much weight in rear yet however.

    Graham
    Graham (SRV
    Driver Safety and Information Systems
    Herts

  3. #3
    Join Date
    May 2004
    Location
    STOKE ON TRENT, U.K.
    Age
    55
    Posts
    10,182

    RE: Spring rates - Jag based cars with SB Chevy engine

    Talk to Simon at Dax,He's a mine of information and he may just know what you need. good luck
    ‚ÄčPro Cobra Builder
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  4. #4
    Join Date
    Feb 2007
    Location
    Stevenage, Herts
    Posts
    686

    RE: Spring rates - Jag based cars with SB Chevy engine

    I have a pair of 375lb front springs (new) for Spax adjustable dampers if any good.

    Graham
    Graham (SRV
    Driver Safety and Information Systems
    Herts

  5. #5
    Join Date
    Jan 2001
    Location
    On the naughty step
    Posts
    13,798

    RE: Spring rates - Jag based cars with SB Chevy

    Nigel B - if it helps these are the spring rates on my Crendon. I dropped the front spring rate by 50lbs/inch from the originals to stop the front "nodding". I do realise that there are as many schools of thought about spring rates as there are belly buttons, but if my info helps, all to the good. Crendon weighs 1048Kg, full tank, me in it ( I weigh 100Kgs, fat Bas**rd that I am) Distribution is 48% front, 52% rear. Engine is FSB, ally heads.
    Car is comfortable on the road, can adjust shockers (AVO's) to make ride hard or soft.

    front - 300lbs/inch 9" long 2 1/4 dia springs
    rear - 275lbs/inch (each) 101/2" long ditto

    HTH

    Wilf
    Crendon has left the building................bright yellow Stag has landed.

  6. #6
    Join Date
    Jan 1999
    Location
    Northampton, Northampton, UK.
    Posts
    9,180

    RE: Spring rates - Jag based cars with SB Chevy

    >fat Bas**rd that I am

    >HTH
    >
    >Wilf

    :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7 :7

    Robert
    Forum Admin

    http://www.cobraclub.com/flags/UK.gif
    Best Regards

    Robert

    Crossed over for a while - Overlanding - Some people are just like slinkies, they don't really have a purpose but they still bring a smile to your face when you push them down the stairs.

  7. #7
    Join Date
    Jan 2001
    Location
    On the naughty step
    Posts
    13,798

    RE: Spring rates - Jag based cars with SB Chevy

    Bollix, Stanley, Bollix. Least I have the height to wear the weight!!!

    Wilf
    Crendon has left the building................bright yellow Stag has landed.

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