Saw an interesting Swap today.... (56k take a nap)
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Northstar Engines and System Technical Discussion Discussion, Saw an interesting Swap today.... (56k take a nap) in Cadillac Engine Technical Discussion; I was at school and heard something mean sounding pull in. I look around trying to figure out what it ...
  1. #1
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Saw an interesting Swap today.... (56k take a nap)

    I was at school and heard something mean sounding pull in. I look around trying to figure out what it is, and find this:



    A 95 Monte Carlo With a Northstar! I never would have expected that! I had a talk to the guy who owns it, and he gave me the specs of the car, and the swap pictures. Very clean swap from what I saw.

    Engine Mods:
    - 1996 Cadillac Seville STS engine swap w/ 4T80-E transmission
    - Converted to OBD I
    - Cadillac Seville STS aluminum radiator/A/C condensor
    - Port and polished heads
    - 3 angle valve/seat grind
    - 272 reground cams
    - New HP springs, retainers, seals
    - Intake cam sprockets redrilled
    - High strength 13:1 compression pistons
    - Forged connecting rods and crankshaft
    - Block bored .030 over
    - Custom Fender WelI Intake with K&N 9" cone
    - Battery relocated to trunk
    - ECM (PROM Calibrated by FAST) with a Perfect Power complete engine managment and fuel injection system managment Laptop hookup relocated to trunk
    - Circuit board relocated to trunk
    - TCI Transmission Computer from FAST which allows has the choice of line pressures, shift timing and firmness of shift for both upshift and downshift points, the ability to have part throttle shifts as a function of road speed while the Wide Open Throttle shifts can be a function of engine rpm in the trunk
    - 3500 stall torque convertor
    - Custom Posi traction and driveshafts
    - Walbro 340 fuel pump
    - Custom Flowmaster Outlaw race muffler side exit exhaust w/ no cat or resonator

    Interior/Exterior Mods:
    - Full painted red dash and door panels
    - Red Sparco racing seats w/ 4 point racing harness
    - Sony CDX-M8815X headunit
    - JL Audio TR690-TXi 3 way 6x9's in the rear
    - JL Audio XR525-CXi 5 1/4 Coaxial's in the front
    - 70% tint all around
    - Multivex sideview race mirrors
    - 20" Akuza Padrone chrome rims with 255/35/20 Goodyear Eagle HP Ultra Plus tires
    - 8000k HID upgrade kit for Low Beams 8500k Xenon High Beams
    - Cross drilled and slotted rotors
    - Red powder coated calipers and drums


















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  3. #2
    DaveSmed's Avatar
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    Re: Saw an interesting Swap today.... (56k take a nap)




















  4. #3
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Re: Saw an interesting Swap today.... (56k take a nap)















    For those who undoubtedly want to hear it, here's a video: http://mywebpages.comcast.net/davesm...Picture022.avi



    .

  5. #4
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Saw an interesting Swap today.... (56k take a nap)

    I wouldn't be surprised if he has $20k into it.

  6. #5
    GreenMachine's Avatar
    GreenMachine is offline Cadillac Owners Fanatic
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    Re: Saw an interesting Swap today.... (56k take a nap)

    I'd be curious to find out what kind of HP and lbs-ft he gets on a dyno with that. Take into account the weight of the versus an STS and you have a fast Monte Carlo

  7. #6
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Saw an interesting Swap today.... (56k take a nap)

    If chrf did the porting, probably 285+ at the wheels. 272 is a pretty mild cam.

    A monte and a STS weigh pretty close to the same...

    95 monte curb weight: 3306
    96 STS curb weight: 3910

    the 4t80e is giong to add 200lbs over stock, so it's 3500 vs 3900lbs...

  8. #7
    CadillacSTS42005's Avatar
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    Re: Saw an interesting Swap today.... (56k take a nap)

    wow... id race it lmfao

    Eldo1 is porting a N* that beneficial i herd it really isnt worth it

  9. #8
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Saw an interesting Swap today.... (56k take a nap)

    Absolutely it's worth it!

    CHRF quote:
    Head work with our cams will really wake up this engine. Figure an increase of 50 cfm will produce 100 HP.


    Their port and polish does show an increase of 50 cfm.


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    Re: Saw an interesting Swap today.... (56k take a nap)

    damn so by porting/polishing the heads and throwin on the 80 mm tb u sell im lookin at a 105 hp increase? itd be expensive as hell tho considering the fact that the heads must be removed and then the headgaskets replaced etc etc etc

  11. #10
    samm is offline Cadillac Owners Fanatic
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    Re: Saw an interesting Swap today.... (56k take a nap)

    thats why you do all the grunt work yourself

  12. #11
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    Re: Saw an interesting Swap today.... (56k take a nap)

    im 19 and while very knowledgeable about general mechanics i have no means to drop the cradle or pull the N*

  13. #12
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    Re: Saw an interesting Swap today.... (56k take a nap)

    Looks like it just makes it

  14. #13
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    Re: Saw an interesting Swap today.... (56k take a nap)

    Hey Dave, any chances this guy will make it to E-Town for the meet? I'd love to see the car.

  15. #14
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Saw an interesting Swap today.... (56k take a nap)

    Quote Originally Posted by CadillacETC1997
    damn so by porting/polishing the heads and throwin on the 80 mm tb u sell im lookin at a 105 hp increase? itd be expensive as hell tho considering the fact that the heads must be removed and then the headgaskets replaced etc etc etc
    No, when you have high flowing heads, the intake starts to become an even larger restriction. You can't just add them up. It would probably be more like, +80hp increase with the stock intake, +100hp increase with a bored TB and spacer.

    From what I've heard, the stock intake becomes a problem >400hp. NA of course, boost doesn't care.

    Anybody have any more information on the ECM? Is it just a rechipped stock computer? SFI?

  16. #15
    danbuc's Avatar
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    Re: Saw an interesting Swap today.... (56k take a nap)

    Porting your heads isn't gonna do much unless your running a F/I system on the car. First off, the engine is only gonna draw in as much air as it can. By increasing the diameter of the intake ports, you increase overall volume, but reduce the velocity of the intake charge. What this means is, even though you can now flow more air, it's not packing in as much into the cylinders because of the reduced speed. You end up with little or no bottom end, and a strong top end. Completely useless in a street car as heavy as a Cadillac. Of course if you are runing a F/I system like a turbo or supercharger on it, then you want that extra volume of air. The velocity of the intake charge will be sped up by the turbo or supercharger anyway, so that no longer becomes and issue. You don't want to polish th eintake ports anyway, since you remove the swirling action that help produce a good A/F misture within the cylinder. A properly sized cam will also be needed to make full use of the ported heads. No sense in increasing the intake port, if the valve is still only gonna open the same amount, and draw the same volume of air in each time it opens. You would need a larger cam, with more duration and lift in order to draw in the maximum amount of air possible. With a larger the cam though, you end up with less bottom end power, since you have to spin it up fast enough so that the increased overlap is no longer a problem. Of course at higher RPM, cylinder scavenging will be more efficient, which in turn helps velocity. That's why big overlap is a problem at low RPM's, it hurts low end exhaust scavenging, which is used to help draw in the intake charge.


    A good example of this would be all these full out race engines you see with tunnel ram style intakes, and big cams. They can barely idle because the velocity of the intake charge is so slow. They usually haave a usuable power band between 3/4000rpm- over 7/8000rpm.

    As I mentioned before, velocity becomes a moot point when going the F/I route, since the air is being "forced" into the intake. You don't have to worry about the engine not being able to draw the air in fast enough.

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