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  • FS Revisions & Redesigns 93-03

    FS Revisions & Redesigns

    Reference by year:
    1993
    Head revised slightly(late 93).

    1994
    Cams revised(rumored be slightly more aggressive).
    Crank revised(mid 94).

    1995
    Intake manifold revised for OBD-II emissions(late 95, same basic design).
    Pistons revised.
    Crank revised(late 95).

    1997
    Crank revised.

    1998
    Throttle body redesigned(larger).
    New intake manifold equipped with VICS introduced for the protégé.
    Old intake manifold(non-VICS) redesigned(less torque bias) for the 626.
    Head redesigned(larger ports - FS9 casting).
    Valve springs revised.
    Lifters redesigned(SLA’s replaced HLA’s).
    Cams revised for solid lifters and slightly improved power and torque.
    Pistons revised.
    Block revised(allows for the OEM oil cooler, also rumored to be stronger and have more coolant passages).

    2000
    Intake cam revised for improved emissions(no change to the exhaust cam).
    Pistons revised.
    Crank redesigned(forged crank replaced cast crank).

    2002
    Throttle body revised(mid 02).
    Rods revised in the advent of the MSP(rumored to be only tolerance revisions).

    Quick reference by part:
    Throttle body: 98, mid 02
    Intake manifold: late 95, 98, 00
    Head: late 93, 98
    Valve springs: 98
    Lifters: 98
    Cams: 94, 98
    Pistons: 95, 98, 00
    Rods: 02
    Crank: mid 94, late 95, 97, 00
    Block: 98


    I'm going to put this up here as a sticky for a week, then I'll move it to the archive. I've left this thread open so feel free to leave feedback here, and as always, you can PM me any time.
    Matt Hicks
    Silver 97 2.0 Turbo
    Factory Green ZX6RR
    If you have 1,000 posts and have not donated to PT, you should consider doing so.
    "We're all still learning."

  • #2
    Good info to have,thanx Hicks. Interesting that the 98 has a larger TB. It'd be nice to maybe change the control box on top of it,etc to use on the earlier models. Or maybe the controler/reader that's on the larger one could be used by the obd1 ecu's? Just a thought...


    '94 PROBE SE Middle-aged croozr

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    • #3
      I am curious about the throttle body how much bigger is the 98 compared to ours??
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      • #4
        Originally posted by bedwards6954 View Post
        I am curious about the throttle body how much bigger is the 98 compared to ours??
        also would it be better to buy the 02 over the 98??? what are the revisions???
        2004 Subaru Impreza 2.5 MTX(Needs Boost BAD!)
        96' Green SE 125k MTX 2075 Lbs "lightweight"
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        • #5
          Revisions are minor, mostly insignificant changes.
          Redesigns are major or significant changes.
          Matt Hicks
          Silver 97 2.0 Turbo
          Factory Green ZX6RR
          If you have 1,000 posts and have not donated to PT, you should consider doing so.
          "We're all still learning."

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