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  1. #1
    Junior Member filfrederick's Avatar
    Join Date
    Jan 2010
    Name
    Phil
    State
    QLD
    Location
    Taringa
    Country
    Australia
    Posts
    19

    Default 4k twincam ke70 the ultimate k

    OK,
    I have always had an obsession with the trd 3kr engine from back in the day, realised I was never going to get a real one so I decided to build my own.

    I don’t recommend this conversion to anyone I did it just to be see if it could be done. It took a lot of time and if I was not a fitter/turner a lot of money.
    Hope you find it as cool as I do.
    - Phil Matthews-Frederick.
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    To save a lot of questions here are the specs.

    Head
    4AGE small port head, head stud holes elongated to suit 4k block
    Head face machined 2mm
    Front face milled to clear 4k waterpump

    Valve train
    Stock valves
    trd springs
    stock cams for now (294deg 8mm lift on the way.)
    belt drive system using 4ac pulleys
    38mm camshaft extensions
    Oil fed support block with needle roller bearings for camshaft extensions
    Crank pulley mounted on the front of the standard v-belt pulley


    Block
    Sonic tested
    Bores repositioned and overbored by 6mm
    Decked by 3.8mm
    Lifter bores, head oil drains and feeds blocked
    Mechanical fuel pump removed


    Crank
    Side counterweights removed
    Knife edged
    Balanced
    Shot peened
    2kg lighter than stock
    Flywheel lightened by 4kg

    Pistons
    Late 4age smallport cast pistons
    Balanced

    Conrods
    4age smallport rods
    Balanced
    Shot peened

    Oil system
    4k internal oil pump shimmed to 60psi oil pressure
    Hose feeds to head, cam extension bearings and oil pressure sensor
    All original head oil drains blocked
    External head oil drains
    4k camshaft remains to drive oil pump

    Sump
    Increased capacity by 1L
    Built in air/oil separator for crankcase breather
    Fitting welded on for oil drains

    Cooling system
    3 core alloy radiator
    Remote thermostat
    Heater ports blocked

    Ignition system
    4k electronic distributor modified to suit 4age head
    Ca18 sparkplug leads

    Inlet
    Quad Mikuni 40mm CV carbs
    70mm trumpets

    Exhaust
    Hi rise tuned length headers
    2” straight under-diff exhaust, huabusa muffler

    Externals
    3k-r look cam cover
    Electric fuel pump
    Last edited by filfrederick; 27th May 2011 at 06:58 PM.

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