00 to 05 T-body Dimensions
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Northstar Engines and System Technical Discussion Discussion, 00 to 05 T-body Dimensions in Cadillac Engine Technical Discussion; Intake opening 86mm . Connector Gasket 72mm AKA plenum . Crossover Housing 74mm . T-body 75mm...
  1. #1
    AJxtcman's Avatar
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    00 to 05 T-body Dimensions

    Intake opening 86mm
    .
    Connector Gasket 72mm AKA plenum
    .
    Crossover Housing 74mm
    .
    T-body 75mm

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  3. #2
    CadillacSTS42005's Avatar
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    Re: 00 to 05 T-body Dimensions

    so are you sayin you CAN make us bored tbs too?

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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by CadillacSTS2003 View Post
    so are you sayin you CAN make us bored tbs too?
    I am not sure you would want to go bigger than OEM

  5. #4
    fubar569 is offline Cadillac Owners Fanatic
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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by AJxtcman View Post
    I am not sure you would want to go bigger than OEM
    eldorado1 already has proven going to a 80mm TB on a 96-99 is good for ~10hp and ~15ft/lbs give or take depending on mods...with a fatter curve as well...

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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by fubar569 View Post
    eldorado1 already has proven going to a 80mm TB on a 96-99 is good for ~10hp and ~15ft/lbs give or take depending on mods...with a fatter curve as well...
    96 to 99

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    fubar569 is offline Cadillac Owners Fanatic
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    Re: 00 to 05 T-body Dimensions

    yes...96-99 - its not like the motor has massively changed between 99 and 2000 besides the obvious (no radical chamber changes, port changes, etc)...similar results could be expected on a 2000+...

  8. #7
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    Re: 00 to 05 T-body Dimensions

    The 2000+ Northstar had pretty serious revisions in 2000. The ports are different, different sized valves, different compression ratio, different intake manifold design, etc. Granted, all of these changes, individually, wouldn't be considered "major", but together they gave a pretty significant change to the engine.

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    fubar569 is offline Cadillac Owners Fanatic
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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by jadcock View Post
    The 2000+ Northstar had pretty serious revisions in 2000. The ports are different, different sized valves, different compression ratio, different intake manifold design, etc. Granted, all of these changes, individually, wouldn't be considered "major", but together they gave a pretty significant change to the engine.
    all of those basically aim to increase the efficiency or power of the motor, yet it still breathes through the same 75mm hole...

    if anything, an 80mm TB would be a bigger benefit to 2000+ years...

    the holdback, is the fact the spacer plate is part of the water crossover. this makes it a PITA to bore...and it needs to be port matched for optimum benefit

    and yes i am aware of the compression drop and use of regular and such...

    a 2000+ should still see at least similar gains...

  10. #9
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    Re: 00 to 05 T-body Dimensions

    I don't think .2 of a compression drop is anything!
    My 99 program in my Fiero has an octane calculator. Yes it will display the octane level that it thinks it has in it and it changes.

    .
    .


    The major performance change in my opinion was the cam profiles.

    1999 Cadillac Seville (LD8 (VIN Y))
    • Valve Timing (With Ramp at 0.100 mm Lift), Intake Opens 8 degrees BTDC
    • Intake Closes 55 degrees ABDC
    • Exhaust Opens 51 degrees BBDC
    • Exhaust Closes 13 degrees ATDC
    • Valve Lift, Intake 8.6 mm 0.339 in
    • Exhaust 8.6 mm 0.339 in
    • Duration (@ 0.100 mm Lift), Intake 243 degrees
    • Exhaust 244 degrees
    • Valve Overlap (@ 0.100 mm Lift) 22 degrees


    2000 Cadillac Seville(LD8 (VIN Y)) 1.7 rockers?
    • Timing, @ 0.150 mm [0.006 in] Lift, Intake Opens 5.6 degrees BTDC
    • Intake Centerline 113 degrees ABDC
    • Intake Closes 236.8 degrees ABDC
    • Exhaust Opens 222.5 degrees BTDC
    • Exhaust Centerline 107 degrees BTDC
    • Exhaust Closes 13.8 degrees ABDC
    • Camshaft Lift, Intake 6.15 mm 0.2421 in
    • Exhaust 5.94 mm 0.2339 in
    • Valve Intake 10.500 mm 0.4134 in
    • Exhaust 10.000 mm 0.3937 in
    • Duration, @ 0.150 mm [0.006 in] Lift, Intake 242 degrees
    • Exhaust 236 degrees
    • Valve Overlap, @ 0.150 mm [0.006 in] Lift 1.98 degrees


    1999 Cadillac Seville (L37 (VIN 9))
    • Valve Timing (With Ramp at 0.100 mm Lift), Intake Opens 13 degrees BTDC
    • Intake Closes 73 degrees ABDC
    • Exhaust Opens 51 degrees BBDC
    • Exhaust Closes 13 degrees ATDC
    • Valve Lift, Intake 9.4 mm 0.370 in
    • Exhaust 8.6 mm 0.339 in
    • Duration (@ 0.100 mm Lift), Intake 266 degrees
    • Exhaust 244 degrees
    • Valve Overlap (@ 0.100 mm Lift) 26 degrees

    2000 Cadillac Seville(L37 (VIN 9))
    • Timing, @ 0.150 mm [0.006 in] Lift, Intake Opens 0 degrees
    • Intake Centerline 122 degrees ATDC
    • Intake Closes 251 degrees ATDC
    • Exhaust Opens 225.5 degrees BTDC
    • Exhaust Centerline 106 degrees BTDC
    • Exhaust Closes 20.5 degrees ATDC
    • Camshaft Lift, Intake 6.15 mm 0.2421 in
    • Exhaust 5.94 mm 0.2339 in
    • Valve Lift, Intake 10.500 mm 0.4134 in
    • Exhaust 10.000 mm 0.3937 in
    • Duration, @ 0.150 mm [0.006 in] Lift, Intake 251 degrees
    • Exhaust 246 degrees
    • Overlap, @ 0.150 mm [0.006 in] Lift 2.04 degrees

  11. #10
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: 00 to 05 T-body Dimensions

    The 2000+ bottle neck is the exhaust ports.

    To do the TB on a 2000 northstar would require honing the water manifold. Because there ain't no way that's fitting on a lathe.

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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by eldorado1 View Post
    The 2000+ bottle neck is the exhaust ports.

    To do the TB on a 2000 northstar would require honing the water manifold. Because there ain't no way that's fitting on a lathe.
    The gasket AKA plenum between the WATER PUMP CROSSOVER and the intake is 72mm

  13. #12
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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by eldorado1 View Post
    The 2000+ bottle neck is the exhaust ports.

    To do the TB on a 2000 northstar would require honing the water manifold. Because there ain't no way that's fitting on a lathe.
    The gasket AKA plenum between the WATER PUMP CROSSOVER and the intake manifold is only 72mm

  14. #13
    fubar569 is offline Cadillac Owners Fanatic
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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by AJxtcman View Post
    The gasket AKA plenum between the WATER PUMP CROSSOVER and the intake manifold is only 72mm
    then carefully bore it out too...by hand if you have to
    problem solved

  15. #14
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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by fubar569 View Post
    then carefully bore it out too...by hand if you have to
    problem solved
    IT IS A RUBBER GASKET!

  16. #15
    fubar569 is offline Cadillac Owners Fanatic
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    Re: 00 to 05 T-body Dimensions

    Quote Originally Posted by AJxtcman View Post
    IT IS A RUBBER GASKET!
    i still dont see a problem here???

    cut the hole - or just improvise???

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