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The reason for my low compression in #4

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    #1

    The reason for my low compression in #4

    A nice lil hole in my exhaust valve...new valve job in progress... next on to the Rings! new high proformance clutch done!!! 8 7/8 disk. Whoo Hoo!
    Attached Files
    '91 Mazda Protege GT/ Completely re-built engine w/.020 head shave, intake/exhaust P&P & 3 angle valve job, 2.25 full custom exhaust, RX-7 AFM, K&N Cone, 18* Timing advance, exhintake cam mod w/Fly'n Miata adjustables, Custom short shifter, CenterForce clutch, lightened flywheel, HAWK pads on all 4, Motegi Racing 8 spoke 16"s w/205/45/ZR16 rubber, VentShade window visors, lower lip spoiler, 4" driving lights w/halo's. MX-3 center console & Black carpet swap w/2 layers dynomat type insulation.
    Soon to come... Garret T25 turbo, DSM injectors, GTX ecu (Needed) SAFC (Needed) FMIC (Needed)

    '91 Toyota Soarer GT-TL/ Stock 1JZ-GTE, K&N drop in filter, Gewalt Evolution deep dish 17"s, Nardi steering wheel

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    Do not be conformed to this world, but be transformed by the renewing of your mind!
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    #2
    glad to see you found the problem! get a P&P done wile you have the head riped down! zoom zoom baby
    91 323 GTX @ 16psi, 5 speed || December 07 R.O.T.M.
    Powered by MegaSquirt I PCB3, Tuned by Lex

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      #3
      Originally posted by redfox
      glad to see you found the problem! get a P&P done wile you have the head riped down! zoom zoom baby
      I was planning on doing a P&P but now I'm not so sure, there's alot to be werked if I start that! How much HP gain could one expect by Port an polishin a BP?
      '91 Mazda Protege GT/ Completely re-built engine w/.020 head shave, intake/exhaust P&P & 3 angle valve job, 2.25 full custom exhaust, RX-7 AFM, K&N Cone, 18* Timing advance, exhintake cam mod w/Fly'n Miata adjustables, Custom short shifter, CenterForce clutch, lightened flywheel, HAWK pads on all 4, Motegi Racing 8 spoke 16"s w/205/45/ZR16 rubber, VentShade window visors, lower lip spoiler, 4" driving lights w/halo's. MX-3 center console & Black carpet swap w/2 layers dynomat type insulation.
      Soon to come... Garret T25 turbo, DSM injectors, GTX ecu (Needed) SAFC (Needed) FMIC (Needed)

      '91 Toyota Soarer GT-TL/ Stock 1JZ-GTE, K&N drop in filter, Gewalt Evolution deep dish 17"s, Nardi steering wheel

      sigpic

      Do not be conformed to this world, but be transformed by the renewing of your mind!

      Comment

        #4
        little if any on a bp.. possibly a little, but the cost out weighs the benefit

        Comment

          #5
          yeah I decided not to P&P my mani, to much werk an time to do! Had a set back to...When I took the head off and inspected the pistons there was the number 20 stamped onto the top, I assumed this to mean that my motor had a .20 overbore so that is the ring size I ordered...wrong!!! turns out I need the standard bore rings. so WTF is 20 doing stamped on my pistons???
          now that puts me back a day, maybe two. soo ****ty! can't wait to get er back on the road
          '91 Mazda Protege GT/ Completely re-built engine w/.020 head shave, intake/exhaust P&P & 3 angle valve job, 2.25 full custom exhaust, RX-7 AFM, K&N Cone, 18* Timing advance, exhintake cam mod w/Fly'n Miata adjustables, Custom short shifter, CenterForce clutch, lightened flywheel, HAWK pads on all 4, Motegi Racing 8 spoke 16"s w/205/45/ZR16 rubber, VentShade window visors, lower lip spoiler, 4" driving lights w/halo's. MX-3 center console & Black carpet swap w/2 layers dynomat type insulation.
          Soon to come... Garret T25 turbo, DSM injectors, GTX ecu (Needed) SAFC (Needed) FMIC (Needed)

          '91 Toyota Soarer GT-TL/ Stock 1JZ-GTE, K&N drop in filter, Gewalt Evolution deep dish 17"s, Nardi steering wheel

          sigpic

          Do not be conformed to this world, but be transformed by the renewing of your mind!

          Comment

            #6
            If you haven't done it already, make sure you replace the valve seals while you're at it.
            -------------------------
            '91 LX
            '03 Mazdaspeed Protege #235
            -------------------------

            Originally posted by pigeon
            well if you're a fan of inaccuracy and uncertainty.... then by all means, go set your timing by feel and sound

            while you're out there, you might as well adjust your air/fuel ratio by smell... and your tire pressure by ride height

            Comment

              #7
              Originally posted by Identity_X
              If you haven't done it already, make sure you replace the valve seals while you're at it.
              fer sure dude, already done! I got an awsome gasket set that included "everything" for the top end...even a new one for the header/downpipe. So once its all back togather the top end should be like new! and later on if I need to do the bottom end I think you can just go in from the oil pan???
              '91 Mazda Protege GT/ Completely re-built engine w/.020 head shave, intake/exhaust P&P & 3 angle valve job, 2.25 full custom exhaust, RX-7 AFM, K&N Cone, 18* Timing advance, exhintake cam mod w/Fly'n Miata adjustables, Custom short shifter, CenterForce clutch, lightened flywheel, HAWK pads on all 4, Motegi Racing 8 spoke 16"s w/205/45/ZR16 rubber, VentShade window visors, lower lip spoiler, 4" driving lights w/halo's. MX-3 center console & Black carpet swap w/2 layers dynomat type insulation.
              Soon to come... Garret T25 turbo, DSM injectors, GTX ecu (Needed) SAFC (Needed) FMIC (Needed)

              '91 Toyota Soarer GT-TL/ Stock 1JZ-GTE, K&N drop in filter, Gewalt Evolution deep dish 17"s, Nardi steering wheel

              sigpic

              Do not be conformed to this world, but be transformed by the renewing of your mind!

              Comment

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