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Geo Tracker 8 valve block 16 valve head

Discussion in 'Other Vehicle Discussions' started by reckedracing, Nov 1, 2006.

  1. reckedracing

    reckedracing TTIWWOP

    I am looking for info on this head swap

    16 valve MPFI tracker motor = G16A
    bottom end is shot
    have a good 8 valve TBI motor

    8 valve and 16 valve have diffrent valve reliefs in the pistons

    put the head on, timing belt
    seems to turn over with no clearance issues
    anyone know anything about this?
  2. Cashizslick

    Cashizslick !i!i!i!i!i!i!i!i!i!i!i!

    Just throw a rotory in it :)
  3. Celerity

    Celerity Well-Known Member

    What year are these motor / head combos ? I know this stuff, but only by year.

    Also, I thought my gf's Tracker had a SOHC, but after close inspection (Yeah, I know.. it sounds strange) it turned out to be a staggered DOHC.

    As I know, lots of these motors cross-over from other years that you wouldn't think. Even the VW Diesel swaps are neat.
  4. reckedracing

    reckedracing TTIWWOP

    well, it turns out it did work

    it was a 94 MPFI 16 valve tracker
    book said stock compression is 190, minimum is 170
    this one had about 100 across the board

    we picked up a 92 auto for a hundred bucks but it was TBI 8 valve
    so we decided it would be a good field/woods car
    it was a damn good runner too, but started puking auto trans fluid
    so we decided to call auto zone and get head gasket part numbers for the 2 models
    same headgasket
    so we pulled the 92 8 valve
    found out the front trans seal had just spun out thus the trans fluid leak

    so we ripped the 92 motor down to swap out the 8 valve block as the rings were smoked out of the 94 block
    once we got the 94 motor out and the head off we noticed the diffrence in valve releifs in the pistons them selves
    fuck it, threw the head on with a timing belt and it spun over with no interferance so we figured we'd try it
    needed to use the 16v timing belt cause its longer and also wider so we needed the 16v crank gear and tensioner

    everything else went together very well and its runs and has a decent amount of power

    swap complete
  5. NissanNiNjA2nd

    NissanNiNjA2nd Senior Member

    I salute your grassroots power.
  6. reckedracing

    reckedracing TTIWWOP

  7. phat87mazdarx7

    phat87mazdarx7 New Member

    my mom just got a tracker too

    I am just curious how did you get it to run, did you use the original throttle body injection or did you wire in the multi port some how.
  8. klyph

    klyph Dismember

    The Tracker was originally MPFI. He put the TBI short block in it.
    It's in the thread.
  9. phat87mazdarx7

    phat87mazdarx7 New Member

    but im saying what car is running now, is it the car with the mpi or the tbi?

    if it was the tbi car how did you change out for the mpi
  10. klyph

    klyph Dismember


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