Quote:
Originally Posted by Summerwolf
Just do some research. There will be cam options available for every powerband, there have always been aftermarket valve train options, literally everything you said doesn't apply to the general "ls/lt" platform historically.
Why is titanium valves a big deal in your statement anyways, GM has used all sort of materials from the factory and the aftermarket has any option available.
Point is, how can anything be "clear to you" when gm hasnt realeased specs for the lt2? Nobody knows what's been changed or cam specs yet. Safe to say it's not a motor that's maxed out from the factory though. Based on history at least.
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It's naturally aspirated...the specific torque (and also features list) has not changed enough to suggest any significant changes in design, the rev limit has not gone up much, and the power peak is right next to the rev limit, peak torque is at a relatively high 78% of rev limit. The cams are fixed profile with phasing adjustment. Those things tell you a good amount, the big unknown is whether the intake manifold has variable length runners and whether or not they've changed the runner length, and also what tweaks to the exhaust have contributed. It could be the same cams with a very high-rpm oriented intake manifold, fairly aggressive cams with the same intake (that would be like the twins, which have a pretty long intake runner length giving you that 3000rpm local torque peak, dip at 3500, and a second peak high up from the high duration cams), or a mix.
495hp @ 6400rpm is 80hp/L at a specific torque of a little under 90Nm/L. A 2 valve/cylinder direct injection engine is not going to do much better than that from the factory, since they have to put crappy short headers on for emissions.
Note that the C6 Z06 produced very similar peak numbers at similar rpms with 13% more displacement but without VVT. The design differences (MPFI vs DI, VVT being the most important) you would expect to account for all of that. Essentially, through cam phasing the max retard intake/max advance exhaust position is "more aggressive" than the LS7 pushing the power higher up, and they've possibly done work to the intake ports to trade off a little low end combustion stability for flow.
Titanium valves are a big deal because they add several k to the engine's cost and would indicate a much more serious effort at performance. If it lets the engine go to say 7300rpm, I'd expect 530-560hp @6.9-7krpm depending on how the intake manifold is set up.
I'm not saying this engine won't go higher than that (more money always helps), I'm just saying this is a pretty good effort from the factory considering they didn't spend crazy money.