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Thread: JDM K20Z2 Motor Questions

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    JDM K20Z2 Motor Questions

    Hi guys, im driving a Civic Fd2 with k20z2 motor which is very similar to k20a3 and had a head swap + RRC piston + Fd2r oil pump and the ECU which has been reflashed by HONDATA..can the stock rod and crank survive at 8k rpm?By the way, im from Malaysia..Thanks

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    Quote Originally Posted by nomad View Post
    Hi guys, im driving a Civic Fd2 with k20z2 motor which is very similar to k20a3 and had a head swap + RRC piston + Fd2r oil pump and the ECU which has been reflashed by HONDATA..can the stock rod and crank survive at 8k rpm?By the way, im from Malaysia..Thanks
    Being that I've personally never tested or done anything with that motor I honestly cannot tell if it can or cant........ But knowing that they are pretty similar in specs and built pretty close I would say setting the rev limiter in the range of 7500 would be "100% safe". But check the graph once your getting tuned, and if the power is falling off at 7500 there is no need to rev higher anyway ya know. Maybe push it 8k max but anymore than that I wouldn't guarantee it holding up.

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    Quote Originally Posted by nomad View Post
    Hi guys, im driving a Civic Fd2 with k20z2 motor which is very similar to k20a3 and had a head swap + RRC piston + Fd2r oil pump and the ECU which has been reflashed by HONDATA..can the stock rod and crank survive at 8k rpm?By the way, im from Malaysia..Thanks
    Moved your posts to your own new thread for reference and organization. [MENTION=56]PetefromtheStreets[/MENTION] [MENTION=40]monjarassi[/MENTION] [MENTION=921]Frostydc5[/MENTION] [MENTION=83]vdubkilla[/MENTION] [MENTION=28]Spaz[/MENTION] [MENTION=193]Xander[/MENTION] [MENTION=287]bulliedog[/MENTION] These guys should be able to answer this for you.


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    My guess is 7600 like the stock k24a2 I had is the max I'd rev as im not all that familiar with the k20a3 nor your z2 but at 7600 you should do well.

    The crank I'm sure youd have no problems with at 8k. But the rod bolts is your only foreseeable weak point.

    When you installed the RRC pistons did you use RRC rods as well? [MENTION=1126]nomad[/MENTION]
    Last edited by BoostedK20; 10-14-2014 at 10:34 PM.
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    Quote Originally Posted by PetefromtheStreets View Post
    My guess is 7600 like the stock k24a2 I had is the max I'd rev as im not all that familiar with the k20a3 nor your z2 but at 7600 you should do well.

    The crank I'm sure youd have no problems with at 8k. But the rod bolts is your only foreseeable weak point.

    When you installed the RRC pistons did you use RRC rods as well?
    Well said x2
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    Quote Originally Posted by PetefromtheStreets View Post
    My guess is 7600 like the stock k24a2 I had is the max I'd rev as im not all that familiar with the k20a3 nor your z2 but at 7600 you should do well.

    The crank I'm sure youd have no problems with at 8k. But the rod bolts is your only foreseeable weak point.

    When you installed the RRC pistons did you use RRC rods as well? [MENTION=1126]nomad[/MENTION]
    Thanks for the reply..no, i didnt change the RRC rod as the size are bigger and cant be fitted into the stock k20z2 crank shaft..but the pistons are interchangeable..

    Here's are my mod:
    1. k20 cl7 cylinder head
    2. k20 FD2r camshaft
    3. k24a2 310cc injectors
    4. RRC 11.7 CR pistons
    5. RRC intake manifold & throttle body
    6. Hondata flash pro
    7. Fd2R 6 speed MT gearbox

    My foreman told me it could make 200 whp or higher with higher RPM (>8k) but i was afraid as it might just blow out...well, after reading your post i'll stick to my current 7600 rpm..thanks guys...

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    Quote Originally Posted by nomad View Post
    Thanks for the reply..no, i didnt change the RRC rod as the size are bigger and cant be fitted into the stock k20z2 crank shaft..but the pistons are interchangeable..

    Here's are my mod:
    1. k20 cl7 cylinder head
    2. k20 FD2r camshaft
    3. k24a2 310cc injectors
    4. RRC 11.7 CR pistons
    5. RRC intake manifold & throttle body
    6. Hondata flash pro
    7. Fd2R 6 speed MT gearbox

    My foreman told me it could make 200 whp or higher with higher RPM (>8k) but i was afraid as it might just blow out...well, after reading your post i'll stick to my current 7600 rpm..thanks guys...
    Gotcha gotcha. Yea I would play it safe but im pretty sure you can make ~220ish whp with the mods you've listed. Even at only 7600rpm.
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    Quote Originally Posted by PetefromtheStreets View Post
    Gotcha gotcha. Yea I would play it safe but im pretty sure you can make ~220ish whp with the mods you've listed. Even at only 7600rpm.
    thanks for the advice..im still on running in period and will bring it for dyno soon and will upload the chart..hopefully it can make ~200 whp..

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    Quote Originally Posted by nomad View Post
    thanks for the advice..im still on running in period and will bring it for dyno soon and will upload the chart..hopefully it can make ~200 whp..
    Please keep us updated with information, pictures, and even video!


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    i will definitely do..thanks guy

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