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Cadillac Seville / Cadillac Eldorado Forum Discussion, Engine swap on 99 Seville in Past Cadillac Vehicle Discussion; Originally Posted by 04GrandAmGT That^, like i said is it possible? probably, does anyone want to go through that much ...
  1. #16
    Seville is offline Cadillac Owners Member
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    Re: Engine swap on 99 Seville

    Quote Originally Posted by 04GrandAmGT View Post
    That^, like i said is it possible? probably, does anyone want to go through that much trouble remodelling the entire engine compartment and redoing everything so that it would work? not a chance, who knows how many man hours that would take for what, the same engine but the updated version... not worth it.
    Thanks all for your opinions. Now I've found a '99 Northstar from STS model (305 hp, number "9"), hope that would fit!

    And sorry for a late, here is some photos from my old engine.

    http://imageshack.com/a/img838/3351/7gdj.jpg <- 1
    http://imageshack.com/a/img842/2918/2xk9e.jpg <- 2
    http://imageshack.com/a/img838/2660/01if.jpg <- 3

    At photo number 1: you can see 1.) scratches on cylinder, 2.) a few dents from small metal pieces, 3.) and my "hole"

    Cheers, Aivars.

  2. #17
    N*Caddy's Avatar
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    Re: Engine swap on 99 Seville

    Just to be clear...when new from factory the VIN 9 engine has 300HP, in time it will loose some, best case scenario 1HP per year. So there is no way that engine has 305HP unless you remove all accessories (alternator, PS, A/C, WP).
    Again VIN Y = 275HP (when new), VIN 9 = 300 HP (when new).

    I have seen many STS/ETC for sale with anything between 305HP to 330HP. The 305 HP one had 5HP stripes on it while the 330HP had cheap loud mufflers, generic "cold" air intake (clogged with oil) and tints.

    I am not sure what kind of scratches are you talking about but if is what I think it is, that is normal, actually welcomed to see. The scratches are what's called cylinder honing and are done from factory to help with the lubrication. Most engines in your area will not have them or be polished out due to the mileage. So the scratches on the cylinder walls are a good sign of the engine health as long as are diagonal if they are longitudinal then that's bad, that's something created while the engine was running. I cannot tell much from the picture.



    If the cylinder walls are good (criss-cross diagonal scratches) and the block is not cracked...I don't see why not replacing the piston(s).

  3. #18
    Seville is offline Cadillac Owners Member
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    Re: Engine swap on 99 Seville

    Maybe it is hard to see on the picture, but these scratches on cylinder walls are rough enough, and when you're sliding with a finger over it you can even feel those scratches. I thought that if we'll change pistons even with 0.02 ratio it wouldn't be enough and oil gonna continue to leaking thru the edge of the piston... Maybe it sounds crazy and new pistons with rings would help, but I'm not sure right now(((

    P.S. "Just to be clear...when new from factory the VIN 9 engine has 300HP, in time it will loose some, best case scenario 1HP per year. So there is no way that engine has 305HP unless you remove all accessories (alternator, PS, A/C, WP).
    Again VIN Y = 275HP (when new), VIN 9 = 300 HP (when new). " It isn't a problem for me, main things are: 1. good compression ratio, 2. no oil leaks from gaskets, 3. no cracks on a crankcase

    !!!It is just MY personal opinion!!!

  4. #19
    MoistCabbage's Avatar
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    Quote Originally Posted by N*Caddy
    Just to be clear...when new from factory the VIN 9 engine has 300HP, in time it will loose some, best case scenario 1HP per year.
    FWIW, my car, at 13 years old, with 90K miles, dyno'd at one MORE WHP than the 1 year old (at the time) STS that Corsa tested in '01. One HP is definitely within the range of error of a dyno, but it shows it definitely hasn't lost much, if any.

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    Re: Engine swap on 99 Seville

    ........... and the viscosity of the engine oil you run makes more difference in horsepower than the age of a well maintained engine. The current testing for the trend toward lower viscosity multigrades is twofold: Slight horsepower increase AND a slight but measurable gas mileage increase.

    Actually, a well maintained mid-mileage engine should gain a horsepower or two due to decreased friction losses in the drivetrain.

  6. #21
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    Re: Engine swap on 99 Seville

    The question is: are the scratches longitudinal or criss-cross?
    Mind you these engines are designed to BURN oil, the rings are kind of loose, more than you would expect.
    Again longitudinal scratches BAD, criss-cross scratches the deeper the better, it means less wear on the cylinder walls and thus honing is intact.
    The seals YOU MUST change, otherwise you are wasting the time, I hope you are not replacing the engine hoping to get better seals, that’s like buying a new car because the old one is dirty.

  7. #22
    Seville is offline Cadillac Owners Member
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    Re: Engine swap on 99 Seville

    "The seals YOU MUST change, otherwise you are wasting the time, I hope you are not replacing the engine hoping to get better seals, that’s like buying a new car because the old one is dirty." Agree - 100 %

    Scratches are longitudinal.

  8. #23
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    Re: Engine swap on 99 Seville

    Scratches are longitudinal.
    That's bad then...

    How it happened, is very, very unusual for these engines.

  9. #24
    Seville is offline Cadillac Owners Member
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    Re: Engine swap on 99 Seville

    And what about to change my Y engine on 9th?? I've got one over here in Latvia. Or for example, can I replace pistons and engine cylinder part from fine "9" to my busted "Y". Beacause as I've seen there are a lot of differences between 9 and Y even if the year is the same: maybe intake changing wouldn't be a serious problem, but electric part with sensors and different final drive ratios scares me...

  10. #25
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    Re: Engine swap on 99 Seville

    Quote Originally Posted by Seville View Post
    And what about to change my Y engine on 9th?? I've got one over here in Latvia. Or for example, can I replace pistons and engine cylinder part from fine "9" to my busted "Y". Beacause as I've seen there are a lot of differences between 9 and Y even if the year is the same: maybe intake changing wouldn't be a serious problem, but electric part with sensors and different final drive ratios scares me...
    ====================================
    Beacause as I've seen there are a lot of differences between 9 and Y
    even if the year is the same:

    the ONLY PHYSICAL difference
    between a SAME YEAR VIN-9 motor and a VIN-Y motor -
    is the intake cams -

    there IS a difference in the transmission also -

    the FINAL DRIVE ratio of a VIN-9 car is 3.77 -
    the FINAL DRIVE ratio of a VIN-Y car is 3.11 -

    the ELECTRONIC PROGRAMMING is much different -
    between the two different engine/trans units -

  11. #26
    Seville is offline Cadillac Owners Member
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    Re: Engine swap on 99 Seville

    Quote Originally Posted by basscatt View Post
    ====================================
    Beacause as I've seen there are a lot of differences between 9 and Y
    even if the year is the same:

    the ONLY PHYSICAL difference
    between a SAME YEAR VIN-9 motor and a VIN-Y motor -
    is the intake cams -

    there IS a difference in the transmission also -

    the FINAL DRIVE ratio of a VIN-9 car is 3.77 -
    the FINAL DRIVE ratio of a VIN-Y car is 3.11 -

    the ELECTRONIC PROGRAMMING is much different -
    between the two different engine/trans units -
    Yes, I understand that
    and I'm asking what will be the best solution for me,
    to swap whole engine, or only cylinder, head and pistons
    to avoid re-programming, problems with transmittion etc.?

    Thanks, Aivars.

  12. #27
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    There is no reprogramming. Whatever you replace, your original intake cams have to end up in the completed engine.

    What you replace depends on what's damaged. Cylinder damage means you'll be replacing the block. Stud/reseal the new engine, swap cams, and install.
    04GrandAmGT likes this.

  13. #28
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    Re: Engine swap on 99 Seville

    if you pick up a Vin 9 engine, swap the intake Cams from your old engine provided they are still in good condition, and boom you got yourself a Vin Y motor.
    Replacing the Head Gaskets on a Northstar? Use our SureGrip Cylinder Head Stud Kit!

    http://www.northstarperformance.com/sgstuds.php

    Patent # 8,740,532, Other Patents Pending

  14. #29
    Seville is offline Cadillac Owners Member
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    Re: Engine swap on 99 Seville

    Thanks guys! At Wednesday my mechanic will start that surgery)))
    I will try to make photos of the process and if someone are interesed in that
    I'll post them here)

  15. #30
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    Re: Engine swap on 99 Seville

    Quote Originally Posted by Seville View Post
    Yes, I understand that
    and I'm asking what will be the best solution for me,
    to swap whole engine, or only cylinder, head and pistons
    to avoid re-programming, problems with transmittion etc.?

    Thanks, Aivars.
    ==============================
    I'm asking what will be the best solution for me,
    the BEST solution is to use the same year GOOD VIN-9 motor -
    and swap your GOOD VIN-Y intake cams -

    then you will have a GOOD same year VIN-Y motor to install in your car -
    WITHOUT ANY FURTHER PROBLEMS -

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