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  1. #11
    Join Date
    May 2016
    Location
    Hockley ,Essex
    Age
    57
    Posts
    218
    Quote Originally Posted by leochas232 View Post
    The LS3 is a modern engine with ECU controlling spark etc from the crank and cam sensors. No distributor required.
    As I mentioned I don't know much about the Ls3 engine but do understand
    what you mentioned about the distributor less type of ignition systems .
    Thanks for your explanation, it is appreciated.
    My thinking was that something had gone away from a standard set up
    therefore changing the way the pump works .
    The 2cv engine used a similar dead spark system without an ECU and with 6 cylinders less .
    Back in the early 90's the xr3 escort started using the same type of system using two coils.
    All of these DIS type setups were one of the best things in my opinion that came out at the time,
    Reliability when up considerably due to the removal of the dissy.
    Chris.

  2. #12
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    59
    Posts
    2,441
    Turns out the oil pump is driven directly from the crank on the LS engine so there is no way of priming the system other than to turn it over on the starter. This set-up might also explain why it took a bit of effort to get oil pressure - the pump is quite well above the height of the oil in the sump.
    Cheers

    Myles D-W

  3. #13
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    42
    Posts
    4,300
    Quote Originally Posted by mylesdw View Post
    Turns out the oil pump is driven directly from the crank on the LS engine so there is no way of priming the system other than to turn it over on the starter. This set-up might also explain why it took a bit of effort to get oil pressure - the pump is quite well above the height of the oil in the sump.
    That's the same setup as the VG30DE (1990s Nissan V6) and I vividly remember not being able to build any oil pressure after a rebuild there, too; the cure was to leave it overnight for the oil to 'soak in' to the pickup etc and voila, as if by magic it built pressure the next day. It was going to be that or pull the oil pressure sender and back-fill the oilways from a pressurised container; I imagine the same approach would work on the LS, as well?
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  4. #14
    Join Date
    Aug 2007
    Location
    Bournemouth
    Posts
    383
    If you're ever building an engine its always a good idea to pack the oil pump with either vaseline or molybdenum disulphide grease, (CV grease). Especially if its going to be a while between building completion and first turn. This helps create a vacuum in order to draw the oil through the system as the oil pump turns. It quickens the process. Both greases being petroleum based will get absorbed into the oil and will do no harm to the engine.
    Life is driving the Cobra. The rest of the time is just waiting.

    Wessex region caretaker rep.

  5. #15
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    59
    Posts
    2,441
    This explains it a bit more, there is a port on the side of the pump for priming.

    https://www.melling.com/videos/how-t...mp-by-melling/
    Cheers

    Myles D-W

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