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Post by naviauxjc04 on Aug 17, 2005 21:52:29 GMT -6
I have heard a lot of people say that the aurora has the cadillac Northsar motor in it. To my knowledge the Northstar is 4.6l and the Aurora is only 4l. It even says right on the motor that it was specificaly made for oldsmobile. So how exactly is the 4 liter related to the northstar? Obviously there is a .6 liter differance in the displacement but what accounts for this? If the aurora 4.0l is the same as Northstar will Northstar mods work with Auoroa? Lots of questions here.
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Post by oldsauroraman1 on Aug 17, 2005 22:05:52 GMT -6
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Post by Marc on Aug 18, 2005 9:49:18 GMT -6
The Aurora engine is a Northstar engine that is bored out smaller than the other Northstars. Northstar bore = 93mm Aurora bore = 87mm The stroke is the same on both engines.....84mm |
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Post by oldsauroraman1 on Aug 18, 2005 10:16:02 GMT -6
Yup, you got it!
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Post by JimW on Aug 19, 2005 11:52:21 GMT -6
The Aurora 4.0 is a variant of the Northstar engine, some refer to it as the Baby Northstar. But its driven by the Northstar combination : All aluminum 32 V V8 bolted to a FWD 4T80E tranny.
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Post by kobalt on Aug 19, 2005 12:32:55 GMT -6
Besides the bore the camshaft profile is on the L47 (Aurora) is different than on either LD8 or L37 (275 & 300 hp northstar variants respectively).
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Post by macadamiaman on Aug 24, 2005 21:56:35 GMT -6
As a side, what's the difference between the two 4.6L northstars? I always wondered what they did with the STS and SLS to make a 25hp difference...
And with the 3.5L engine - is it completely different, as well as the two less cylinders?
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Post by Aurora40 on Aug 25, 2005 10:30:44 GMT -6
Kobalt, actually I believe the LD8 and L47 share the same cams, at least on the 2nd gen motor. Part numbers would clear it up, but someone once posted the specs of the LD8 cam from the service manual, and they matched my specs exactly.
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Post by kobalt on Aug 29, 2005 0:15:30 GMT -6
Aurora40, Im only going on a certain post (which of course I cannot dig up) on caddyforums where a guy put Aurora cams into an LD8 and lost power. However displacement to power ratio on the L47 and LD8 is exactly the same which would suggest that you are correct.
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Post by stevensolds on Aug 29, 2005 2:09:46 GMT -6
Kobalt -- wasnt it the other way around -- where the guy put the caddy cams onto the Aurora V8 and lost power? I remember that thread over there but cant find it. Maybe I am wrong -- i just remember it that way.
also maca i think they just chopped the 2 cylinders off and that was it. lol.
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Post by Aurora40 on Aug 29, 2005 8:29:38 GMT -6
Aurora40, Im only going on a certain post (which of course I cannot dig up) on caddyforums where a guy put Aurora cams into an LD8 and lost power. However displacement to power ratio on the L47 and LD8 is exactly the same which would suggest that you are correct. I think you are thinking of the Aurora owner who put L37 (300hp) cams into his 4.0L. The motor probably gained power way on the upper end, but the torque would suffer a lot. He said it was a dog when you got on the gas until the revs built up. He swapped back the stock cams. |
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Post by oldsauroraman1 on Aug 29, 2005 10:06:53 GMT -6
Wow, that's weird!
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Post by kobalt on Aug 29, 2005 14:06:30 GMT -6
Bob, Steve perhaps you are right. I can't remember very well lately - all this schooling effs with your head...
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Post by Marc on Aug 29, 2005 18:47:38 GMT -6
The Aurora V-8 in the Aerotech had the L-37 cams.
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Post by Aurora40 on Aug 29, 2005 19:00:12 GMT -6
Yup, but it was pulling a lot less weight and had two extra cogs. The motor should have more top-end with the L37 cams, but I think in a daily driver the lack of low-end would suck. Maybe with the 3.71:1 and a higher-stall torque convertor, but I still bet it would suck a bit. The guy who did it didn't have an autobahn.
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Post by oldsauroraman1 on Aug 29, 2005 19:23:29 GMT -6
That aerotech is an AWESOME car. We saw it about six years ago in Lansing.
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Post by naviauxjc04 on Sept 8, 2005 14:10:30 GMT -6
Thanks guys. I did a little bit more research myself and the difference between the northstar and the 4.0 liter is the diameter of the iron cylinder sleeves. In my research I found a site where someone was using the aurora 4.0 liter in a mainstream race circuit. All I remember reading was that his 4.0 was running 15:1 and ran on alcohol. Just a little trivia for you guys.
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