500 quattro 4 valve cyl. head
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Thread: 500 quattro 4 valve cyl. head

  1. #1
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    500 quattro 4 valve cyl. head

    Hi,
    I recently bought a 500 quattro in parts.
    Its not matching numbers with frame and missing a lot original parts so i decided to try to build myself a GP-replica.

    Has anybody tried to find a 4-valve DOHC cyl.head that could fit the engine such as from the Honda cbx 550 for instance?

    Any ideas or tips is most welcome

    Thanks
    Karl

  2. #2
    Senior Member R Powell's Avatar
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    Richard Powell
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    Hi not sure if you will find any cylinder head to fit it although Benelli did make a double overhead cam prototype
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    Last edited by R Powell; 12-08-2018 at 01:35 PM.
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    The Benelliman
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    This looks fantastic, I was not aware of such present. However since it is a prototype it surely is impossible to get once hands on...

    I think I might get close to as much horsepower from a head with 8 valves but it should be a DOHC. I know that suzuki had one and maybe someone else.

    The ideal would be a replica engine from 1973 J.Sarinnen bike but I have never seen any for sale.

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    Member p65crosser's Avatar
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    Double OHC Benelli

    I know that several of the French and German club members have built "Benelli" fours with either a Suzuki or Kawasaki 550 engine which are DOHC but tuning parts are easier to get than Benelli.
    But in my book if it hasn't got a Benelli engine then it isn't a Benelli is it?
    Regards

    Ian
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    Benesaki

    As a matter of interest here is a picture of the Benelli rolling chassis with the 550 Kawasaki engine fitted and finished as a Saarinen replica by one of the Benelli Club de France members,
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    500 DOHC engine

    Quote Originally Posted by p65crosser View Post
    I know that several of the French and German club members have built "Benelli" fours with either a Suzuki or Kawasaki 550 engine which are DOHC but tuning parts are easier to get than Benelli.
    But in my book if it hasn't got a Benelli engine then it isn't a Benelli is it?
    Regards

    Ian
    I agree,, a Benelli should be keep as much Benelli as possible.
    I did find a picture of an engine that look like Benelli made and wonder if anybody know if this is something possible to buy/build?
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    Member p65crosser's Avatar
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    Benelli Racer Engine

    Hi Karl
    This engine was built by a German member of the Benelli club and is a highly modified Kawasaki Zephyr Zr 550 from about 1991. And I mean HIGHLY modified to look as close as possible to the original Benelli racing four, even down to fitting a Mercury outboard motor Magneto on the front of the crankcase as per the works bikes. A good attempt and probably looks more like a works 500 Benelli engine than a quattro four engine.
    Regards

    ian

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    Quote Originally Posted by p65crosser View Post
    Hi Karl
    This engine was built by a German member of the Benelli club and is a highly modified Kawasaki Zephyr Zr 550 from about 1991. And I mean HIGHLY modified to look as close as possible to the original Benelli racing four, even down to fitting a Mercury outboard motor Magneto on the front of the crankcase as per the works bikes. A good attempt and probably looks more like a works 500 Benelli engine than a quattro four engine.
    Regards

    ian

    Hi Ian,,

    Some engineering skills...it looks like a real Benelli engine but I am no expert of course.I suppose you are not allowed to race classic racing with this engine,or?
    The production Benelli `Pasolini`engine as far as I can understand gave close to 90 bhk in its prime and I don`t know if that kind of power is possible to achieve in an OHC engine without turbo or compressor...and then we are out of classic racing rules.

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    Senior Member Kevin S's Avatar
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    For what it's worth, a not very good quality pic of Paso working on an engine.

    500 quattro 4 valve cyl. head-renzopasolinigiancarlocecchini.jpg

  11. #10
    Member p65crosser's Avatar
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    Bensaki racer

    The Benelli Kawasaki racer is currently for sale for €32,000
    see
    Benelli 500 GP-Replica A-4614 Marchtrenk - www.classic-motorrad.de
    Ian

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