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Thread: An unusual valve spring set up

  1. #1

    An unusual valve spring set up

    Spotted this the other day in an Alvis workshop, called the 9 spring set up, quite odd, they must have thought it worth doing I guess vs just stronger springs.

    IMG_20170808_131905 by teamlizardracing, on Flickr

    IMG_20170808_131912 by teamlizardracing, on Flickr



    IMG_20170808_131912 by teamlizardracing, on Flickr




    And a pic pinched off the net of a 9 spring set complete.

    engine-rebuild-3 by teamlizardracing, on Flickr
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  2. #2
    Regular Floyd's Avatar
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    They look coil bound to start with. Weird.
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  3. #3
    An interesting one!!!
    I work with quite a few old cars and see some great stuff,much ahead of its time like a 1934 Riley with twin cams & hemis head to name one.
    Not so sure this is going to become popular but Alvis has great heritage,just wonder what the reason was?

  4. #4
    Regular Uncle Benz's Avatar
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    Old Ferrari v12 used a similarly bizarre arrangement...

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  5. #5
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    Often the wierd and wondeful arrangements are due to the materials technology of the day. The maths side of things, they knew what they wanted, the production of what arrived is a compromise of what the material was able to withstand v what was available (as in at all, not just cost basis).

    Big springs..... internet expert warning... appear to suffer from harmonics that fatigue the material at certain revs. Double valve springs, one inside the other are a solution to avoid have such waves affect the springs valve seating abilities.

    Perhaps the 9 are a idea to avoid either bounce, the limits of too high a spring rate. This might be due to valve seat and valve train wear but how spring rate works when in 'parrallel' with other springs is a guess for me 9 thibg it will be accumulative- anyone? . The other thing is, if its post war, steel was in restricted supply. Aluminium was avaliable but steel was not necesarily so.
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    That ferrari...

    Roller rockers for less losses.

    Screw and locknut. Aaah, designed by someone who worked on the things.

    Hairsprings. Compact. It appears the springs - two per cylinder are anchored mid length, with a reversal of the coil direction. Again I believe to avoid waves affecting seating.

    What year is it?
    "Obstacles are those frightful things you see when you take your eyes off your goal". Henry Ford.

    I'm the king of the swingers.
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    And thats whats bothering me woooah
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  7. #7
    Regular Uncle Benz's Avatar
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    Quote Originally Posted by Andy C View Post
    That ferrari...

    Roller rockers for less losses.

    Screw and locknut. Aaah, designed by someone who worked on the things.

    Hairsprings. Compact. It appears the springs - two per cylinder are anchored mid length, with a reversal of the coil direction. Again I believe to avoid waves affecting seating.

    What year is it?
    Colombo v12, 1946-1959. I believe the Lampredi v12 used the same method, as well as unusual cylinder liners screwed into the cylinder head. The hairpin spring allowed a shorter valve stem to be used, reducing moving valve train mass, as well as the body of the spring not being part of the reciprocating valve/spring mass as well. Better valve cooling is another advantage too.
    As you correctly assume, the main hold back was material technology and manufacturing methods. Around the late fifties sufficient improvements had been made which saw Ferrari move to coil sprung valves on all its engines.
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