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glanzagee

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Posts posted by glanzagee

    Larger Valves in a 4efte head

    in Engines

    Posted

    putting bigger valves in theses head changes alot of things


    i learned the hard way and paid for it too be rectified !



    heres what happens in the wrong hands !



    (We have checked the valve spring pressures. At fitted length they are 55.6 to 58.4 lbs.

    Over the nose of the cam they are 124 to 126.5 lbs. which is very low, especially for a turbo charged

    application where the boost pressure is lessening the poundage on the inlet valves. You may risk valve blow by on high boost.


    Coil binding occurs at 0.80 inch. At the current fitted length you are 0.225 inch off coil bind at full cam lift.

    We would run as close as 0.060 inch on some engines if they require it. (1.5mm.)

    I would suggest that the spring poundages are increased by using a thicker spring seat. The current spring seats are very agricultural (Machined washers of some sort.) To use a thicker spring seat would invlove a purpose made seat to locate the bottom of the valve spring. This is currently located by a machined step in the head casting, outboard of the valve guide. Using a thicker plain spacer would lose this location of the valve spring. There is enough space however to machine a purpose designed spring seat.)



    this is just a very small part of putting bigger valves in

    rectified now and reving too 8250rpm (5e)


    next step back too back test on a flow bench.

    Ring Gap

    in Forged Series

    Posted

    Basically just need help to what size I need the rings to be and what size feeler gauge to use

    The instructions you have posted above says it all

    ?

    What your asking is dependent on what your using the car for

    P.s I hope you have the correct tool too file the rings ! And know how too use it !

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