Difference between VIN Y and VIN 9
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Northstar Engines and System Technical Discussion Discussion, Difference between VIN Y and VIN 9 in Cadillac Engine Technical Discussion; Can Someone Tell Me The Differences In The 2 Engines From A 96 - 99 Eldorado Or Seville...
  1. #1
    allpro1 is offline Cadillac Owners Member
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    Question Difference between VIN Y and VIN 9

    Can Someone Tell Me The Differences In The 2 Engines From A 96 - 99 Eldorado Or Seville

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Difference between VIN Y and VIN 9

    Y runs around 275 advertised HP. 9 about 300. Cams and PCM/management tuning, but NOT a simple swap. Take a long read in the N* PCM tuning forum (many pages.....)

    The Y torque comes in at a lower range than the 9. Y is suited for the traffic light set while 9 appeals to the long haul high speed driver.

  4. #3
    Dadillac's Avatar
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    Re: Difference between VIN Y and VIN 9

    Y engines have 275 hp and 300 tq. Also have a 3.11 final drive ratio. 9's have 300 hp, and 295 tq. Also have a 3.71 final drive.

    Don

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    AJxtcman's Avatar
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    Re: Difference between VIN Y and VIN 9

    In the 96 to 99 engines the Intake Cams are the only mechanical differences.

    The tranmissions are different from a Y to a 9 application. The biggest part is the final drive gear ratio. 3.11 vs 3.71

    The PCM program is different on many levels. Too much to go into

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    Ranger's Avatar
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    Re: Difference between VIN Y and VIN 9

    The "Y" engines will obviously deliver a little better mileage due to the lower final drive ratio.

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    dhm37 is offline Cadillac Owners Member
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    Re: Difference between VIN Y and VIN 9

    The Intake Cams are higher lift in the 9, and the valve springs are stiffer for both intake and exhaust valves. As far as I can tell, the valves are identical for both 9 and Y.

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    AJxtcman's Avatar
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    Re: Difference between VIN Y and VIN 9

    Quote Originally Posted by dhm37 View Post
    The Intake Cams are higher lift in the 9, and the valve springs are stiffer for both intake and exhaust valves. As far as I can tell, the valves are identical for both 9 and Y.
    The spring are the same except in 93 and maybe 94. after that they are the same

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    FRAN_Astur is offline Cadillac Owners Member
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    Re: Difference between VIN Y and VIN 9

    How can I identify wich of them is each? Where can I look for to know if a engine is from a VIN Y or a VIN 9 car?

    Thanks.

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    Submariner409's Avatar
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    Re: Difference between VIN Y and VIN 9

    Take a look at your VIN. The 8th character will be a 9 or a Y. The engine itself also has a "VIN derivative" stamped in a pad on the lower right front side of the block.
    Otherwise, read the Northstar Performance threads, go back a month or so and find AJxtcman's posts on Northstar cam numbers. It's all in here, somewhere.

  11. #10
    FRAN_Astur is offline Cadillac Owners Member
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    Re: Difference between VIN Y and VIN 9

    Thanks for the reply, I ask becouse a friend bought a 98 STS with a hard knock in the engine ( I think it could be a rod), and he found other 97 northstar engine and bought it for the STS, but we don't know anything about the vin of the donnor car, so, this is why I ask. We allready have the engine, and don't find any to identify this other engine. I also must say that when he bought this engine, we was thinking that all northstar engines were equals, less little changes over years.

    I think you don´t need that I say that I am new in cadillacs. My other cars are a 91 Trans Am and a 73 Camaro.

  12. #11
    Ranger's Avatar
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    Re: Difference between VIN Y and VIN 9

    If you have the right VIN, '97 & '98 should be compatible.

  13. #12
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    Re: Difference between VIN Y and VIN 9

    Quick question, would a Vin 9 1994 swap with a Vin 9 1999? Both are STS's

  14. #13
    97EldoCoupe's Avatar
    97EldoCoupe is offline U.S. Patent #8,740,532 - www.studkit.com
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    Re: Difference between VIN Y and VIN 9

    The 94 will have different heads, which will need some modification, and there's a bolt hole for the RH engine/trans mount that will be non-existent on the '94, and you will need to drill & tap a hole for the knock sensor between the #3 and #5 cylinder under the intake. I'm sure I could think of other little issues but you'd be better off starting with the correct year engine. It can be done though.


    Need parts for your Northstar Engine? www.northstarperformance.com

    Jake Wiebe, developer of the SureGrip™ Cylinder Head Stud Kit

  15. #14
    Ranger's Avatar
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    Re: Difference between VIN Y and VIN 9

    '94 is OBDI. '99 is OBDII.

  16. #15
    97EldoCoupe's Avatar
    97EldoCoupe is offline U.S. Patent #8,740,532 - www.studkit.com
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    Re: Difference between VIN Y and VIN 9

    Yes it is OBD1, but if you use the 99's intake plenum & TB, you've already taken care of most of the sensors. I believe the CKP/cam pos. sensors are the same from 93-99, and so is the crankshaft reluctor wheel. The only thing you would have to do is relocate the mounting for the knock sensor and use the '99's, because in 1996 the knock sensor & its location was revised. Oil level and pressure sensors I'm not 100% sure but they can easily be transferred.

    The issue is the "cuts" in the intake ports. This would pose a serious vacuum leak if they weren't filled up prior to bolting down a 95-99 intake plenum. JB weld or something similar would do the trick, provided that what ever you use, would never break loose and fall into the ports.


    Need parts for your Northstar Engine? www.northstarperformance.com

    Jake Wiebe, developer of the SureGrip™ Cylinder Head Stud Kit

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