Engine swap question

Discussion in 'Gen 3 Prius Technical Discussion' started by cnc97, Jun 29, 2018.

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  1. padroo

    padroo Senior Member

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    It's always good to have choices.
     
    #201 padroo, Aug 18, 2018
  2. cnc97

    cnc97 Senior Member

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    When the choice is A: $1200 150k mile Gen 3 engine or B:$1000 8k mile Gen 4 engine that needs “massaged” or reusing “repaired” Gen 3 head, I think the obvious choice is the lower mile short block. At least it is for me.
     
    #202 cnc97, Aug 18, 2018
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  3. JC91006

    JC91006 Senior Member

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    Until you say to yourself "never again"
     
    #203 JC91006, Aug 18, 2018
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  4. ASRDogman

    ASRDogman Senior Member

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    Well, if someone has some extra cash, and time, they could buy a few Gen 4 engines and convert them to the Gen 3.
    They sell them ready to install!
     
    #204 ASRDogman, Aug 18, 2018
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  5. cnc97

    cnc97 Senior Member

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    Shhhh, the price on Gen 4 engines just went up!! LoL
     
    #205 cnc97, Aug 18, 2018
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  6. Ragingfit

    Ragingfit Active Member

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    #206 Ragingfit, Aug 19, 2018
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  7. Ragingfit

    Ragingfit Active Member

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    #207 Ragingfit, Sep 8, 2018
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  8. Grit

    Grit Senior Member

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    Very cool, was that you’re project?
     
    #208 Grit, Sep 8, 2018
  9. Alltwocents

    Alltwocents Junior Member

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    Thanks guys,
    I took the info and jumped on a 1k mile 4th gen motor for $800.
    The swap is going nice. Hope to have it running tomorrow.
     

    Attached Files:

    #209 Alltwocents, Sep 8, 2018
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  10. Threej

    Threej Member

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    Still waiting for the anecdote of taking the frankenprius to the dealer for an oil change :-D
     
    #210 Threej, Sep 9, 2018
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  11. cnc97

    cnc97 Senior Member

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    Approaching 3000 miles on mine and not a hint of an issue at all. Showing 53.5 mpg on the HSI and that’s driving in Normal mode. No measurable oil loss or coolant usage.
     
    #211 cnc97, Sep 9, 2018
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  12. Shane Burns

    Shane Burns Member

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    Now I kinda want to buy a Prius with blown head gasket and swap 4th Gen engine in it!! I miss my Prius already! :oops:
     
    #212 Shane Burns, Sep 9, 2018
  13. amos

    amos Active Member

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    @cnc97 i salute you for the courage and thibking out of the box.
    I read most of your threads and wanted to ask you for a summery of all items of the swap which were not identical and next to each one a summery of how you took care of it.like the dipstick etc... Hoping its not too time consuming for you
     
    #213 amos, Sep 11, 2018
  14. amos

    amos Active Member

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    @cnc97 i salute you for the courage and thibking out of the box.
    I read most of your threads and wanted to ask you for a summery of all items of the swap which were not identical and next to each one a summery of how you took care of it.like the dipstick etc... Hoping its not too time consuming for you
     
    #214 amos, Sep 11, 2018
  15. cnc97

    cnc97 Senior Member

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    On my swap, I used my Gen 3 head. New head gasket and bolts. I reused the valve cover gasket from my engine. There’s an issue with FelPro and their part numbers for the Gen 3 motor. The only things correct in the entire head gasket set were the head gasket, exhaust manifold gasket, intake gasket, and the valve seals. The other miscellaneous gaskets in the set were wrong. I reused the EGR gaskets, water pump gasket, throttle body gasket, thermostat gasket.

    I used the chain and gears from the Gen 4 engine. Also the cams. New tensioner though. Timing cover and valve cover are Gen 3. I did buy a can of high temp black wrinkle finish paint for the valve cover. Gen 4 coils were a direct fit. Also Gen 4 fuel rail and injectors. However the rubber hose from Gen 4 fuel rail is different. The vehicle side connector is different. Use the rubber hose with connector from the Gen 3 motor.

    If anyone within 75 miles of Evansville IN has a need for a Gen 4 head, valve cover, intake, and some other miscellaneous hoses, drop me a PM. It’s taking up space, but it’s too valuable to just throw away. The head is missing one cylinder worth of valves.
     
    #215 cnc97, Sep 11, 2018
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  16. Ragingfit

    Ragingfit Active Member

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    #216 Ragingfit, Sep 23, 2018
    Last edited: Sep 23, 2018
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  17. greasemonkey007

    greasemonkey007 Active Member

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    Do you know if the ecu's are programmed the same? Could be kind of like 1st and 2nd gen 1.5L engines. Same size, but I think there are differences in the programming, VVT, and etc. Of course that is not rock solid assurance speaking though. I could be mistaken. Just saying, it's worth considering.
     
    #217 greasemonkey007, Sep 25, 2018
  18. Mendel Leisk

    Mendel Leisk Senior Member

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    Memorable quotes:

    "...you're looking at the part you wanna remove; just go ahead and remove it, yah know..."

    "...you're gonna be looking at this wire through the whole process, thinking: what do I do with this wire..."

    "... make sure you don't break the glass, cus this will be right where you don't want it, for this whole process..."

    "...if you're going to be hyper: don't be hyper there..."

    "...on the floor: the car's got leather, it doesn't get to sit on the seat..."

    Thank you, really good video, funny, invaluable tips, saving this. (y)

    Particularly like how you stay organized, the drawers and sticky notes. And the prep: things to do before you disconnect the batteries. And to take pictures/videos before you start pulling stuff off.

    The cowl and wipers sounds very similar to regular 3rd gen hatchback btw.

    Big question: the video is "part one". Going to YouTube I didn't see subsequent parts. Are they there, or are you still editing? Really like to see it through.

    This should be stickied, once the dust settles? @Tideland Prius ?
     
    #218 Mendel Leisk, Sep 25, 2018
    Last edited: Sep 25, 2018
  19. Ragingfit

    Ragingfit Active Member

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    There are 8 parts, (about 3 hours edited) so far, on YouTube. Editing is time consuming, and no "do overs" on this, yet. More to come - the engine installation videos will go up as they are edited. And please forgive the quality and sometimes the noise. Next time, the compressor will go outside.
     
    #219 Ragingfit, Sep 25, 2018
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  20. Ragingfit

    Ragingfit Active Member

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    I took it on faith that mine would run as a Gen 3. On the Gen 4, there were changes to the engine, trans-axle and ECU/PCU, but there is no need to change the ECU/PCU.
     
    #220 Ragingfit, Sep 25, 2018
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