505 front coil springs
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  1. #1
    Fellow Frogger!
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    Default 505 front coil springs

    hello
    the coil springs in my 505 are painted with 3 yellow marks one above the other, i wonder if that means "3 yellow", or only "1 yellow" which was painted 3 times for visibility. the reason for asking is that they don't match the official data in this here link- they have only 7.6 coils and their free height is about 505 mm.

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    http://peugeot505.info/files/sb/sb_1984_xx_my84_n05.pdf

  2. #2
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    I suspect they are 1 yellow and have settled from original length of 575 to current 505mm. What is the thickness of the wire used and are you measuring the number of total coils or free coils?

  3. #3
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    wire is about 12.5mm, my caliber is not the most accurate.
    7.6 or 7.5 are the free coils of course.

  4. #4
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    Here are 2 more charts to confuse you. I have some 505 diesel (shortened) front springs on my 505 which measure 13.5mm wire and were originally super long and they don't conform to anything on those charts. But they were the wire thickness I wanted and I shortened them to suit the ride height I wanted.

    I think the 12.5/12.7mm springs are the std 504/early 505 springs and are fairly soft. What do you intend to do with the springs?
    Attached Thumbnails Attached Thumbnails 505 front coil springs-505-spring-data-chart1.jpg   505 front coil springs-505-spring-data-chart2.jpg  

  5. #5
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    thx for the charts.
    the front rhd corner is much lower than the lhd, it could be because of the a/c compressor, although i installed a pair of springs from a 83 factory equipped a/c car (marked 1 white 1 yellow), and although there's the pas pump in the other side.
    my original springs were 84, 1 yellow marked 3 times one above the other.
    maybe i'll mix them.

  6. #6
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    Yep you should be ok with one spring a little longer on one side as long as the wire thicknessnes are the same (or a tiny bit thicker on the longer spring as longer springs are softer).

  7. #7
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    Quote Originally Posted by nisspug2 View Post
    longer springs are softer).
    are you sure about that? the formula of spring rate doesn't include the spring height.

  8. #8
    cjl
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    Quote Originally Posted by 2pac View Post
    are you sure about that? the formula of spring rate doesn't include the spring height.
    It most certainly does. The free length is used in the calculation.
    1975 504
    1985 505 STI with V6
    1992 505 wagon
    1969 404

  9. #9
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    Quote Originally Posted by cjl View Post
    It most certainly does. The free length is used in the calculation.
    Not according to this calculation:
    Spring Rates Database

  10. #10
    cjl
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    1975 504
    1985 505 STI with V6
    1992 505 wagon
    1969 404

  11. #11
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    Well 2pac I think you are right and I stand corrected - a spring can be longer than another spring, but have fewer nr of coils and therefore be a stiffer spring and not a softer spring. The longer coil in my imagination had a greater nr of coils, and would therefore be softer (given same wire diameter, coil diameter and modulus) but I agree that this is not necessarily the case. I should have said "longer and with extra coils".

    I still don't know if free length is needed in the formula though - some include it and some don't. This one also doesn't:

    Suspension Coil Spring Rate Design Equations Formulas Calculator

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