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1700 motor on 1800 gearbox.

Discussion in 'Engine & Transmission' started by Dean Mitropoulos, Sep 5, 2021.

  1. Dean Mitropoulos

    Dean Mitropoulos New Member

    Messages:
    5
    Location:
    Sydney, Australia
    So I bought a new motor advertised as a 1.8 however the engine code shows it to be a 1.7. the issue is I have a 1.8 gearbox. Does anybody know of this and how it will be if it even works.
     

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  2. robmich

    robmich Active Member

    Messages:
    564
    Location:
    buff point
    my understanding it should be fine,only changes with the 2ltr 091 6 rib gearbox
    Rob
     
  3. tintop

    tintop Well-Known Member

    Messages:
    942
    Location:
    Canberra
    Should be fine ... many old 1.7 cases are now 1.8 litre engines anyway - so it could be that's what you have
     
    Mordred likes this.
  4. Dean Mitropoulos

    Dean Mitropoulos New Member

    Messages:
    5
    Location:
    Sydney, Australia
    What do you mean by that. I though the 1.8 will be larger in the bores or are you saying the 1.7 engine can be made into a 1.8 engine and regardless of a 1.7 or 1.8 it will be fine with my 1.8 gear box

    thanks, Dean
     
  5. tintop

    tintop Well-Known Member

    Messages:
    942
    Location:
    Canberra
    Yep, many got 1.8 litre pistons and barrels (and by now probably heads a few times)...and yep no problem with a five rib box off a 1.8 litre.
     
  6. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    4,589
    Location:
    Seven hills
    Is that number on the fan housing or the engine block itself?
     
  7. cbus

    cbus Well-Known Member

    Messages:
    13,475
    Location:
    sunshine coast
    As above.
    The important issue is mating of gearbox shaft to engine.
    3 rib and 5 rib boxes will mate with 1700 and 1800.
    In any combination thereof.
    Gearing difference marginal.
    The 2 litre 6 rib box / engine combo is different and also runs a different starter motor.

    Barrels and pistons are available in various sizes.
    Some fit without mods
    Bigger upsizings usualy require machining of case and heads.
     
  8. Dean Mitropoulos

    Dean Mitropoulos New Member

    Messages:
    5
    Location:
    Sydney, Australia
    Well it looks like you have made this clear thanks. Will gear ratios be any issue with revving as you say it is marginal.
     
  9. cbus

    cbus Well-Known Member

    Messages:
    13,475
    Location:
    sunshine coast
    Will be more dependant on health of engine.
    I'll dig up a chart later.
     
  10. cbus

    cbus Well-Known Member

    Messages:
    13,475
    Location:
    sunshine coast
  11. tintop

    tintop Well-Known Member

    Messages:
    942
    Location:
    Canberra
    Even if it still has 1.7 litre barrels and pistons (which I doubt) the difference is only 2 bhp between a 1.7 litre and a 1.8 litre ... all good
     
    Grantus likes this.
  12. Dean Mitropoulos

    Dean Mitropoulos New Member

    Messages:
    5
    Location:
    Sydney, Australia
    think of the fan housing will double check
     
  13. Dean Mitropoulos

    Dean Mitropoulos New Member

    Messages:
    5
    Location:
    Sydney, Australia
    sound fine then. I am only asking to make sure all is go because I am planning to put in this 1.7 when I finish my restoration. My original 1.8 motor will need rebuilding at some stage eventually down the track. I don't think it should be that hard to rebuild the 1.8 engine later on. I will just need to read up on it.
     

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