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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 Vs Northstar in Cadillac Engine Technical Discussion; I bought a 1995 deville hear in FL for a leave down hear car. Had 185k on it. $1300 at ...
  1. #31
    oscodagp63 is offline Cadillac Owners Member
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    Re: 4.9 Vs Northstar

    I bought a 1995 deville hear in FL for a leave down hear car. Had 185k on it. $1300 at a garage sale real prety white car. ran it to 191000. Just gave it to my son as he just moved to NC and is in a bit of a pinch. The car is a good runner, only thing I take note of is the front main knock after warming up at very slow speeds. at 80mph real smooth and quiet. I got a couple of used car dealer buddies down hear and they say no more N* I love the N* for power and performance, Ive got a 98 from FL in michigan. minor oil leaks replaced water pump and gave it a flush. no further problems since then

  2. #32
    92EldoTC's Avatar
    92EldoTC is offline Cadillac Owners Enthusiast
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    Re: 4.9 Vs Northstar

    N* pulls harder, is that at low rpm's or highway speeds?
    I like my 4.9, besides the plugs it's nice and reliable, low maintenance also which is what I like most about it.
    First gear isnt so bad either.
    It still adequately pulls the old boat around.

  3. #33
    I~LUV~Caddys8792's Avatar
    I~LUV~Caddys8792 is offline Moderator
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    Re: 4.9 Vs Northstar

    Northstars pull like hell at highway speeds.
    "They call Alabama the Crimson Tide, call me Deacon Blues."

    Current:
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  4. #34
    92EldoTC's Avatar
    92EldoTC is offline Cadillac Owners Enthusiast
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    Re: 4.9 Vs Northstar

    Quote Originally Posted by I~LUV~Caddys8792 View Post
    Northstars pull like hell at highway speeds.
    yeah 32 valves will do that for you.

  5. #35
    Mark A. Klein is offline Cadillac Owners Member
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    Re: 4.9 Vs Northstar

    Quote Originally Posted by Ghost C View Post
    I have $50 that says my 4.9 DeVille will promptly beat down any N* DeVille on the east coast.

    Unless said Northstar has a 100 shot or better.

    4.9's have better performance potential, you just have to know how to use them.
    OK i'll bite... How do you use them? Any modifications? I am looking for some... My thought is a 4.5 1990 motor with the long rods. Series II Eaton supercharger.... Any body else think this is dumb?

  6. #36
    Necrosan is offline Cadillac Owners Enthusiast
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    Re: 4.9 Vs Northstar

    I have one of the "9" VIN NorthStars in my Eldorado ETC, and my brothers 4.9 whipped this car every time off the line. He had a 90 Deville with the 4.9. On the freeway though, he'd be tough to even spot in my rear view mirror. Off the line the NorthStar isn't that bad ass, maybe a PCM tune would help, as I've done every major maintenance possible to this car at this point. My .02.

  7. #37
    92EldoTC's Avatar
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    Re: 4.9 Vs Northstar

    hate to say it but 4.9's are dogs on the freeway, on the flip side its hard for most stock cars to beat it off the line to about 45

  8. #38
    awadecki is offline Cadillac Owners Enthusiast
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    Re: 4.9 Vs Northstar

    Having owned two 4.9-powered cars (a 91 Deville and a 92 STS), and a Northstar-powered car (95 Oldsmobile Aurora), I can definitely say that the 4.9 is way faster until about 40mph. The 4.9 starts running out of breath after 1st gear, whereas the Northstar is just warming up.

    As for which is lower maintenance, I don't really know. Both the N* and 4.9 have water pump issues, but the water pump on the N* is way easier to replace. The N* has MAJOR oil leak issues though, and you have to remove the engine to change the gasket. All N* engines will leak oil at some point. The 4.9's injectors love to go bad around 70k miles.

    In my opinion, the best N* engines are those from 1995 and before. GM changed the engine around in either 1996 or 1997 and cheapened it. This cause a bunch of problems from oil consumption to head gasket issues. GM also cheapened all of their transmissions in the late 1990s. 4th gear clutches notoriously go out on 4T60Es of this time period, and the 4T80Es weren't as reliable, either.

    The best GM cars are either those made today, or those from about 86-93. After that, their terrible supplier relations really hurt their quality (remember Ignaki Lopez?), and it's just starting to come back.

  9. #39
    AMGoff's Avatar
    AMGoff is offline Cadillac Owners Connoisseur
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    Re: 4.9 Vs Northstar

    Quote Originally Posted by awadecki View Post
    Having owned two 4.9-powered cars (a 91 Deville and a 92 STS), and a Northstar-powered car (95 Oldsmobile Aurora), I can definitely say that the 4.9 is way faster until about 40mph. The 4.9 starts running out of breath after 1st gear, whereas the Northstar is just warming up.

    As for which is lower maintenance, I don't really know. Both the N* and 4.9 have water pump issues, but the water pump on the N* is way easier to replace. The N* has MAJOR oil leak issues though, and you have to remove the engine to change the gasket. All N* engines will leak oil at some point. The 4.9's injectors love to go bad around 70k miles.

    In my opinion, the best N* engines are those from 1995 and before. GM changed the engine around in either 1996 or 1997 and cheapened it. This cause a bunch of problems from oil consumption to head gasket issues. GM also cheapened all of their transmissions in the late 1990s. 4th gear clutches notoriously go out on 4T60Es of this time period, and the 4T80Es weren't as reliable, either.

    The best GM cars are either those made today, or those from about 86-93. After that, their terrible supplier relations really hurt their quality (remember Ignaki Lopez?), and it's just starting to come back.
    That's not really the fairest of comparisons... the smaller displacement of the Aurora V8 meant 250HP and 260lb-ft of torque... where as a full flavored Northstar carries with it a minimum of 275HP and near as makes no difference, 300lb-ft of torque... that makes for a bit of a difference.

  10. #40
    I~LUV~Caddys8792's Avatar
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    Re: 4.9 Vs Northstar

    Who's Ignaki Lopez?
    "They call Alabama the Crimson Tide, call me Deacon Blues."

    Current:
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    1992 Cadillac Sedan deVille (12/04-9/07)
    1999 Mercedes Benz S320 (8/07-7/09)
    2000 Buick Regal GS (7/09-4/12)
    2003 Mercury Marauder (4/12-10/13)
    1991 Buick LeSabre Custom Sedan (9/12-6/13)
    2013 Honda Accord LX Sedan (6/13-1/14)

  11. #41
    92EldoTC's Avatar
    92EldoTC is offline Cadillac Owners Enthusiast
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    Re: 4.9 Vs Northstar

    And who's Keyser Soze?

    The N* in the Aurora was the baby version of the caddy N* but the 4.9 will still beat even the caddy N* to the end of first gear and we all know what happens after that.

    Even though the caddies N* makes 300 ft-lbs, that torque doesn't come up until about 4400 rpms while the 4.9 makes its 275 ft-lbs at 3000.

    As far as reliability, both engines come from the same manufacturer and both have their issues.

    I have read that the N* is easier to work on but is more high maintanance and even though the 4.9 is harder to replace certain engine components on, once you replace them you're good for another 100k miles.

    Its pretty much just a matter of buyers choice!

  12. #42
    awadecki is offline Cadillac Owners Enthusiast
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    Re: 4.9 Vs Northstar

    Lopez was GM's VP of Purchasing who defected to VW and took confidential documents with him. He was notorious for resourcing long-standing contracts with GM suppliers, and simply awarding contracts to whomever had the lowest bid. Quality wasn't #1 in his mind--cost was.

    Although my Aurora N* was smaller than a 4.6L engine, I've driven the 4.6L engines, too, and they're not very fast until you hit 3500rpms, when the power starts to surge.

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