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Thread: mrpham's ITB MX-5

  1. #61
    Member Nemo's Avatar
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    Wow quick progress, keep it up.
  2. #62
    Member mrpham's Avatar
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    Quote Originally Posted by chewyryce View Post
    did you remember to get a spigot bearing?
    It's not spigot bearing because noise is there with the clutch out, clutch in noise goes away. Also spigot bearing on inspection is good to go.

    The noise is from a roller bearing in between the input and output shaft, which is inside the gearbox. So it means a rebuild type of job.

    Miata.net post with some good info I found:
    http://forum.miata.net/vb/showpost.p...4&postcount=23
  3. #63
    Member chewyryce's Avatar
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    alright. i always replace the spigot every clutch job.. just my 2 en
  4. #64
    Member mrpham's Avatar
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    Quote Originally Posted by chewyryce View Post
    alright. i always replace the spigot every clutch job.. just my 2 en
    I will too then, I'll see if I can get one tomorrow and take it to your work to press it in.
  5. #65
    Member mrpham's Avatar
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    So instead of buying a replacement NA6 engine, I bought a NB6 engine. Still 1.6L but was taken from a JDM 2002 NB Roadster. Has solid lifters instead of hydraulic lash adjusters and makes about 10HP more, uses my original wiring etc... More details later.

  6. #66
    Member mrpham's Avatar
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    Bought my replacement engine on Saturday from MX-5 Plus, but instead of picking up a regular 1.6L B6 engine from a NA6 I purchased a 1.6L long engine from the NB6. In Japan, the NB series Roadster (MX-5) had the 1.6L engine up until 2005. The cast iron block is identical, but the head and intake are different. The hydraulic lash adjusters are replaced with solid lifters and cams have more lift. The CAS is no longer used and replaced with a cam position sensor and crank angle sensor. The NB6 also uses the crank-shaft nose/pulley/cog, water pump and oil pump from the 1.8L BP engine.

    To run the NB6 engine in a NA6, there are two options. First option is to swap the entire NB6 wiring and ECU into the NA6, the other option is to use the following NA6 items on your NB6 head/block.

    • intake
    • exhaust
    • CAS
    • rear water outlet
    • front water outlet
    • alternator (using the NB6 pulley)
    • air con (if you have it)
    • power steering (if you have it)


    In addition to this, you will need a modified intake cam-shaft. The NB6 intake cam-shaft doesn't have a slot for the CAS, so the NA6 cam-shaft end is cut off and pressed into the NB6 cam-shaft. Pretty straight forward and costs $100 to do.

    Now all that info is out of the way, here are some photos of my progress so far.


    Showing the revised crank nose, difference between the short nose crank-shaft bolt (right) and the revised crank bolt.


    Removing the old front seal, new front seal in. May as well replace all the seals and gaskets while the engine is out.



    Removing the sump was a bitch because the baffle is bolted under the oil pickup, and this results in the sump being "stuck" until you seperate the baffle from the sump.


    Brand spanking new water pump =)



    Pulley boss attached, and most of the external parts attached.


    Engine finally off the stand =)


    New rear main seal in and flywheel on (nearly anyways).
  7. #67
    Member mrpham's Avatar
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    New Radiator - http://omgpham.com/new-radiator-stuff

    After finding out my radiator was leaking, I ordered a eBay special China radiator. Bought one for my S15 and it was pretty decent, especially for under $200. I ordered the 52mm dual core aluminium design for a low low cost of $175 delivered to my door from Melbourne.



    Test fitting it, a bit of squeeze because its 52mm thick. But so worth it =)

    Also I took my valve cover and water outlets to get blasted at Chilton Engineering, they turned out looking brand new! Much better then paying over $300 for brand new items through Mazda.


  8. #68
    New Member
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    Keep it up mate, love the progress,
    looking forward to what you do with an Fd if you get one, i just bought one.
    Cheers Todd
  9. #69
    Member mrpham's Avatar
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    Engine Swap Completed - http://omgpham.com/engine-swap-completed

    So stayed up late last night getting it all ready, completed everything apart from gearbox oil and timing. Didn't run into problems, just followed the service manual etc.. Did everything by myself, actually pretty easy to pull/install engines in the MX-5.

    And now the photos I managed to take =)


    New clutch on and aligned, my freshly blasted alternator case.


    The modified NB6 intake camshaft to allow use of the CAS.


    Timing belt TDC, timing covers on.


    Gearbox mounted and ready to go in =)


    Lowering it in slowly, easy does it.


    BBOOOOooooooooyyyyyyyyyyyyyyyyaaaaaaaaaaaaaaaaaaaa h!!


    Exhaust manifold and valve cover back on.


    52mm dual core aluminium radiator mounted up.


    Intake back on and temporary catch can installed.


    Bleeding clutch with a "one man brake bleeder kit" and filling gearbox with oil using a funnel and hose.


    THE END
  10. #70
    Member Jace.'s Avatar
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    That just makes me want to go straight out to the shed.

    What are the actual advantages of an NB6 engine, compared to a longnose NA6 engine, considering you could change the lifters and cams in an NA6 head anyway?

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