K20z3 Headswap Troubles

Discussion in 'Bolt-Ons And All Motor' started by Bikit, May 15, 2019.

  1. Bikit

    Bikit Well-Known Member

    Messages:
    19
    Location:
    Fort Worth, Texas
    Vehicle Model:
    Honda Civic Si
    Body Style:
    Sedan
    Has anyone on here completed a K20z3 headswap that could help me out? I put the entire head on my stock block but am having troubles with starting. If i try to start it, it will turn over fine but will never start, however if I disconnect the camshaft sensors, it WILL start and run... Any ideas? I'm at a loss here
     
  2. webby
    • Staff
    • 2018 Toys For Tots

    webby Administrator

    Messages:
    49,722
    You just bolted a k20z3 head on a k24z7 block without any internal changes?

    =====
    I've been looking into thus and speaking with John from hytech who is the one who actually built the HPD cars with the head swap.

    He said you'll need rods and pistons because the z7 pistons have a higher dome than others and will cause interference, and you have to change the rods because the rod wrist pin is a different diameter than previous K series rods so you can just bolt up and K series pistons to the z7 rods.

    The A2 oil pump requires a lot of fabrication to work, like a modified windage tray which also means you need to modify the oil pan.

    And if your removing all these parts it also means you need new bearings and gaskets.

    So your gonna needs a head, all gaskets and bearings, as well as Honda bound/ gasket maker.
    see how this can be expensive.

    ======


    hybrid racing has a writeup for a k24/k20 build, and it mentions this -

    Once the engine is back together, you can now begin to reinstall all of the other components (i.e. Intake manifold, water pump, alternator, engine wiring harness).

    • Note: When installing the engine wiring harness, the Crank Position Sensor (CKPS) will not work with the K24. Be sure to get the K24 sensor and sensor plug. Make sure to wire the sensor the same way.
    https://www.hybrid-racing.com/blogs/hybrid-racing/k20-k24-hybrid-engine-build-guide
    =======




    You could also hit up this guy. He apparently does k20 head swaps on 9th gens.

    "You can find me on Instagram under k20z3allmotor or email me at k20z3allmotorftw@gmail.com"



    someone provided a parts list for a k20 head swap here
    http://9thcivic.com/forum/threads/k20-head-swap-parts-list-needed.6612/
     
  3. sunofwolf

    sunofwolf Active Member

    Messages:
    688
    Vehicle Model:
    honda SI 2013 35% tinted Hondata coupe 136+mph! SRT-4 180+! VFR-800-11750 rpm 10.9 1/4 130+! Neon 2001!
    Body Style:
    coupe
    I can't imagine building a engine like this, its not a easy thing to do:squirrel:
     
  4. Bikit

    Bikit Well-Known Member

    Messages:
    19
    Location:
    Fort Worth, Texas
    Vehicle Model:
    Honda Civic Si
    Body Style:
    Sedan
    I did end up using a ported RSX Type S oil pump kit from PRL, bolts up easily and less to mess with than the stock oil pump for sure. https://prlmotorsports.com/k24z7andk24z3prbtype-soilpumpswapkit.aspx

    I also used new k24z7 stock pistons as I was burning a decent amount of oil and reused the original rods, hopefully thats not the issue. Seemed to be ok when it did run with camshaft position sensors disconnected, but it is also very loud since the headers do not bolt to the mid-pipe currently. I'm going to look back into the sensors and everything soon.

    Engine timing should be correct, double and triple checked everything on that.
     
  5. ron v
    • 2018 Toys For Tots

    ron v The good, the bad, and the booty

    Messages:
    3,480
    Location:
    Escondido
    Vehicle Model:
    Hot fuego
    Body Style:
    Coupe and hatch
    Faulty sensor?
     

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