Ws6kid.

Guess the Lt1 is back? o.O
hope this isn't a repost...

GM lifted the veil of secrecy on its fifth-generation V-8 small-block today; the engine will see its first appearance in the 2014 Corvette. Many prognostications were wrong, so here's all the specifics, right off the GM press kit:

Gen 5 Small Block LT1 Specifications

Engine type: 90-degree V-8 with overhead valves; continuous VVT
Displacement: 6.2L (376 cubic inches)
Bore x Stroke (in / mm): 4.06 x 3.62 / 103.25 x 92
Cylinder block: cast aluminum with nodular main caps
Main bearing fasteners: six, including two cross-bolts per cap
Crankshaft: forged steel
Connecting rods: powder metal, 6.125 inches in length
Pistons: eutectic aluminum alloy
Compression ratio: 11.5:1
Cylinder heads: 319-T7 cast aluminum with 59.02cc combustion chambers
Valve angles (degrees): 12.5 intake, 12 exhaust
Intake valves: 2.13 inches (54mm) hollow
Exhaust valves: 1.59 inches (40.4mm) hollow sodium
Camshaft: Hydraulic-type with tri-lobe for fuel-pump drive
Camshaft lift: 0.551-inch (14mm) intake / 0.524-inch (13.3mm) exhaust
Camshaft duration: 200-degrees intake / 207-degrees exhaust (at 0.050-inch)
Lobe separation angle: 116.5 degrees
Fuel delivery: direct injection
Intake manifold: “runners in a box” design; composite construction
Throttle: 87mm electronically controlled throttle body
Ignition: 58X with individual coil-on-plug and iridium-tip spark plugs
Horsepower / kW: 450/335 (estimated)
Torque – lb.-ft. / Nm: 450/610 (estimated)
Max. engine speed: 6,600 rpm (fuel cutoff)

03Sssnake

iTrader: (20)

I am kind of excited and this is the entry level offering. Can't wait to see what GM has planned for the Z06, ZR1 etc....

speedtigger

iTrader: (16)

In other pictures, it looks like they swapped the intake and exhaust valve locations from the current LS motors. This will likely mean that existing headers won't fit if people want to swap this new design engine in to their existing LS powered cars. That sux.

Ws6kid.

Love the picture showing the internals! But im excited to see whats up for the z06 and zr1..... lt4 for the zr1?

robguitargod1

iTrader: (1)

Oil jets to lube cylinder walls?

03Sssnake

iTrader: (20)

^^^ I believe you are correct. There are quite a few enhancements going into this GEN5 motor. I am most excited about the direct injection system, apparently there is an extra cam lobe that drives the DI pump, which is fed by an in-tank fuel pump. I wonder how more fuel will be delivered when guys starting modding these, guessing it will be done via tuning?

tikiman12

iTrader: (4)

I just hope the intake manifold flow properly. I'm tired of having to swap out to aftermarket plastic intake manifold for almost a grand lol

BT03mach-1

I'm more worried about how the car will look. i won't be able to afford one till they are out a few years.

i wonder how much headers will cost? ~$2500?

jdoyle

iTrader: (27)

the fuel pump is cam driven? anyone have any more info on this?

ramairetransam

iTrader: (18)

very cool , why did they have to use the lt name again . it will make it confusing . make it the lr engine

03Sssnake

iTrader: (20)

The DI pump, looks like it is fed by a traditional in-tank pump. CP is from GMinsidenews

"cam-driven fuel pump: The direct injection system features a very-high-pressure fuel pump, which delivers up to 15Mpa (150 bar). The high-pressure, engine-driven fuel pump is fed by a conventional fuel-tank-mounted pump. The direct injection pump is mounted in the “valley” between cylinder heads – beneath the intake manifold – and is driven by the camshaft at the rear of the engine. This location ensures any noise generated by the pump is muffled by the intake manifold and other insulation in the valley."

jdoyle

iTrader: (27)

crazy. sounds like it will be exciting to open that engine up.

ls1ya

iTrader: (2)

http://www.enginelabs.com/news/break...-block-reveal/

scj

iTrader: (89)

They had to drive something off the cam. It's an lt1.

69gto96z

iTrader: (13)

That cam is small, can't wait to see how a nasty aftermarket cam performs in one of these.

Anthony Williams

iTrader: (3)

I reall think GM hit this one out of the park..NA,DI, DOD, cVVt, 450hp-450ft.lbs (VERY CONSERVATIVE RATINGS) 6600rpm fuel cut off...And the ability to run 0-60 in under 4sec in the C7...SMDH CAN YOU IMAGINE WHAT THIS THING WILL DO ONCE TURBO OR SUPERCHAGED..Or just run off E85

GM has really took some pages from the race book on this one=Forged crank, Scavenge HP fuel system, oil jet piston cooling, oil trap oil pan etc.

No Vette or Camaro for me..But Impala SS, CTSV or ATSV and I'm there..

It will be very nice to see how the 5.3L version stacks up against Fords 5.0 and EcoBoost TTv6?
The new GM full size trucks debut in Dec (production has already begun) and the Gen 5 engine will be in them soo?? Looking up the dates for the LA autoshow now!!

No more LS development from GM though--Long live the LS Baby!

chevyboy91188

iTrader: (15)

you'll have to look into the diesel world for this answer. You just add a belt driven high pressure pump and tap into the rail. like the guys who run dual cp3 pumps on their duramax cummins etc

Anthony Williams

iTrader: (3)

LMassOff..Yep!

Lighter and more fuel efficient than the BMW and MB TTv8s but makes just as much or more power..Nice!

rumblebox

iTrader: (9)

Jesus ******* christ. Aside from the design looking awesome so far, there are 24 other letters of the alphabet they could have used other than the same name that has been accompanied by laughter for the past 14 years.

Also i wonder how much power the stock DI system will support before being upgraded, if at all.

And i wonder how hard it will be to crack the new OS.

Im really excited about this. Hopefully megasquirt comes out with a unit soon so people can do conversions easily.

NemeSS

iTrader: (127)

The exhaust port and spacing look like common current ls. Bolt pattern and spacing?