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  1. #11
    Senior Member edinlr's Avatar
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    I found it in two different hoses as I was checking. Think about Honda's goal of perfect engineering and you can visualize an engineer back in Japan saying IHI says we need 10 to 20 psi max, so we must reduce the oil flow down to not exceed this spec. I also have to wonder if they had some seal problems early on in development and did that as a "bandaid" fix to reduce the problem. I am sitting here trying to decide if an engine that spins at 9,000 rpm and a turbo that spins 150,000+ rpm, need more oil for lubrication, or less pressure on the seals? Darn, one way to find out for sure. I am going to contact my turbo rebuilder to get their opinion.
    CX500C
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    Hawk
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    RG500
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    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
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  2. #12
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    Added those photos to the Turbo Wiki. Great information.

  3. #13
    Senior Member Pim205GTI's Avatar
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    Quote Originally Posted by edinlr View Post
    I found it in two different hoses as I was checking.
    When I read this I started doubting. I know the turbo oil hose fitting on the engine has an oil flow restriction :



    See oil control orifice in the upper right corner.

    But a restrictor inside a rubber hose no way !

    I knew I had an original CX650T lying around somewhere with the original hose clamps and protection cover still there.
    I looked into the tube and hell no there looks to be a restrictor visible inside the tube !

    I tried to push it out but I didn't succeed, well then take a knife and cut the hose open carefully

    Well and then everything became clear, a section cut through the hose :


    or with some enhancement :



    The inside of the hose on the Turbo side must have been deformed because of heat and almost completely collapsed, leaving only a small passage !

    I believe here lies the source of the apparent restrictor in the oil supply hose of our Turbo's
    Golden Boomerang Wheels Rock



    CX500TC - summerfun

    VF750F

    CBX1000 - exploded in garage

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  5. #14
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    That is exactly what I suspected would be the case.

  6. #15
    Senior Member 81custom's Avatar
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    To Ed Pim & Tim,

    Thanks for the information and pictures - brilliant.

    If I gather from the photos - it could appear that the oil restriction was/is an internally collapsed hose - possibly from heat from the turbo unit, or Ed did you mention that there was something INSIDE the hose on your discovery?

    Absolutely intriguing to say the least. Could it also be a reason of premature failure of Turbo units in general if not getting enough oil??
    81 CX500 Custom

    82 CX500 Turbo

  7. #16
    Senior Member edinlr's Avatar
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    Well it looks like I will have to cut one apart too just to confirm that is what caused the restriction, but that sounds like exactly what I saw in two hoses.
    CX500C
    CX500T
    CX650E
    CX650T
    Hawk
    CB750 w/turbo
    RG500
    V-Max
    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
    Screaming Eagle Road King
    CBR600F3
    Honda Metropolitan
    Ninja H2 1000
    & a dozen battery chargers

  8. #17
    Senior Member edinlr's Avatar
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    I was checking other boards about restricting the oil flow. It seems some of the Subarus have similar issues.
    Turbo Gurus: Do all IHI turbos need a restrictor for oil flow? - Subaru Forester Owners Forum
    CX500C
    CX500T
    CX650E
    CX650T
    Hawk
    CB750 w/turbo
    RG500
    V-Max
    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
    Screaming Eagle Road King
    CBR600F3
    Honda Metropolitan
    Ninja H2 1000
    & a dozen battery chargers

  9. #18
    Senior Member 81custom's Avatar
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    They also talk about ball bearing turbos and floating bearing turbos - I believe the floating are the sort installed in the Bikes. So it seems they need pressure to lubricate properly.

    thanks again for all contributions -great information guys.
    81 CX500 Custom

    82 CX500 Turbo

  10. #19
    Senior Member edinlr's Avatar
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    From what I gathered on the Subaru boards was that the ball bearing type turbos need a 1mm. restriction and the ones like ours need a 1.5mm restriction. I guess this is a simple as getting a piece of aluminum or brass and drilling it and then cutting for size to put in your replacement hose. I have also seen a reference to a "pill" type restrictor and that would work too if we found one with the right ID and OD.
    CX500C
    CX500T
    CX650E
    CX650T
    Hawk
    CB750 w/turbo
    RG500
    V-Max
    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
    Screaming Eagle Road King
    CBR600F3
    Honda Metropolitan
    Ninja H2 1000
    & a dozen battery chargers

  11. #20
    Senior Member Pim205GTI's Avatar
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    Quote Originally Posted by edinlr View Post
    From what I gathered on the Subaru boards was that the ball bearing type turbos need a 1mm. restriction and the ones like ours need a 1.5mm restriction.
    You are not far off, the oil control orifice ( aka restrictor ) for a CX650T is 1.2mm , see part number 15531-ME7-000

    Golden Boomerang Wheels Rock



    CX500TC - summerfun

    VF750F

    CBX1000 - exploded in garage

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