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phewop118 @ Jan 3rd 2008 2:48PM
NOOOOOOOOO!!!! DAMN YOU GM!!!! YOU ARE SCREWED! Cadillac cannot compete in the luxury market unless it has a powerful V8. Mercedes, BMW, and Audi all have nice and powerful V6's, but its their V8's that shine (and sell). I have driven a 3.6 DI STS and 4.6 N* V8 back to back and the 3.6 sucks compared to the "slightly" more powerful V8. Why can't GM make a DI V8, making about 360-400hp, while still getting as good of mileage as the Northstar?
Frylock350 @ Jan 3rd 2008 2:57PM
GM isn't dropping powerful V8s, they're just not investing in a new DOHC one. And why would they? Their pushrod V8s are exemplary in producing both power and economy with excellent packaging. Once DI gets into the pushrod motors with AFM you'll see a 5.3L V8 with 400hp and vastly improved mileage and the Ethanol option.
The N* is a pig compared to the LS motors. The LS motors are torquier, physically smaller, more powerful and get better efficiency, all while sounding like an angry grizzly bear (that's a good thing).
jgp @ Jan 3rd 2008 4:20PM
The LS motors are fine for the Vette and "ordinary" sport sedans like the G8 and (fingers crossed) a future Impala SS.
But pushrods will always have severe NVH issues, and NVH should never be associated with Cadillac. Not even remotely.
The Northstar is bloody outdated, and the LS isn't fit for Cadillac. The Ultra V8 should have put Cadillac back on the map with a flagship ready to take on the BMW 7-Series and Mercedes S-Class.
The HF w/DI is an impressive engine, but Cadillac's upcoming flagship needs an engine with more than 300hp. I can easily see an HF-based 4.8L V8 with over 400hp (assuming the same hp/cyl as the 3.6L DI V6). Bore it out a bit more (how does 5.3L sound?), and it'd easily surpass the supercharged Northstar.
J.Crew @ Jan 5th 2008 2:38PM
All they are doing is dropping the developement of a low volume engine with limited production use. I have no worries about Cadillac and its use of 8 cylinders. GM is looking at profitable growth with an eye on what needs to be developed to meet the new fuel economy standards in the future. They are being smart by not wasting money and talent on a project with a limited future. This engine would have been completed just in time to be hit by the new fuel economy standards to kill it off and people would have been slamming GM for not thinking ahead and knowing that this engine does not fit the times. Seems to me that GM is being smart and most likely looking at other options like using this new diesel:
http://www.gm.com/explore/fuel_economy/news/2007/adv_engines/diesel_061807.jsp
Notice the size and power estimates. It fits in the same space as GM's current small blocks. The N* was larger than the small blocks. Also the torque rating on this new engine would make one hell of a great premium feel in a large Cadillac while making excellent fuel economy...