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Originally Posted by porscheguy9999
ANOTHER XLR-V thread? #3 I think? Nice pic though. THe XLR-V's 4.4L V8 is originally from the Corvette. But its the same used in the STS-V and CTS-V. You think they would make a 6 speed manual optional...
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The 2006 Cadillac STS-V's 440 hp 4.4 supercharged Northstar V-8 has DOHC and 32 valves. The Corvette's V-8 is an OHV, 2 valve V-8. Very, very different engines.
Cadillac first came out with their 4.6, DOHC V-8 in 1993. It has been revised for rwd duty.
"The XLR's Northstar V-8 VVT is a 90-degree, DOHC, four-valves-per-cylinder engine featuring an aluminum block and cylinder heads, and a valvetrain configuration with roller finger followers. The engine has been extensively re-engineered for the luxury roadster, and it marks the Northstar's first adaptation to rear-wheel-drive (RWD) and all-wheel-drive (AWD) configurations.
Other Northstar firsts on the XLR include four-cam continuously variable valve timing (VVT); electronically controlled, hydraulically actuated intake and exhaust cam phasers on all four camshafts for extra control; electronic throttle control (ETC); low restriction intake and exhaust manifolds and cylinder head ports; close coupled catalytic converters mounted directly adjacent to the exhaust manifolds; and a new air induction system, redesigned for enhanced capacity and noise attenuation. It also has a more powerful engine control module (ECM) and high-speed local area network (LAN) communication system dedicated to engine and transmission control, a new engine-mounting system and more rigid block structure for outstanding operating smoothness and quietness.
The V-8 offers smooth, refined performance throughout its entire operating range. It is quiet, yet tuned to give the driver feedback from the environment. It operates even more cleanly and efficiently than its predecessors, with excellent reliability and durability. The XLR features the first longitudinal application of the 4.6L Northstar V-8.
The V-8 is mated to the Hydra-Matic 5L50-E five-speed automatic transmission."
- Cadillac press release
Here is more information on the new STS-V
http://media.gm.com/events/autoshows...0overview.html