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12.08.2015 08:45
liter small block V8 UPDATE Zitat · antworten

<P>The Authentic Shaun Alexander Jersey Corvette's new LT1 V8 engine is, no surprise here, set to make the car very competitive within its class. Preliminary numbers suggest no less than 450 horsepower and 450 pound feet of torque for the 6.2 liter engine, as well as an estimated 0 60 mile per hour time of less than 4.0 seconds when installed in the base C7. To put those numbers in perspective a bit: The LT1 not only has a far higher specific output than the 6.2 liter LS3 that it replaces up at least 20 hp and 26 lb ft but its torque is seemingly competitive with that of the 7.0 liter LS7 that lives in the heart of the current Corvette Z06.
<P>With all that power and accelerative performance, Chevy engineers are still keeping fuel economy in mind with the help of cylinder deactivation, the new Corvette powerplant is expected to deliver more than 26 miles per gallon on the highway, though figures for city driving are still unknown. The new small block also benefits from the latest advanced engine tech like direct injection, continuously variable valve technology and a relatively high 11.5:1 compression ratio, Steve Largent Jersey all while coming in a claimed 40 pounds lighter and four inches shorter than the 4.4 liter twin turbo V8 by BMW. Chevy also notes that while premium fuel is recommended, it is not required with the LT1. We're also told that a dry sump oil system is optional (a traditional wet sump unit is standard).
<P>GM is calling the LT1 its most advanced combustion system ever. The company analyzed literally hundreds of systems to get to this final product, including crunching over 6 million hours of CPU time dedicated to combustion system optimization, and nearly 10 million hours when combustion, structure, cooling systems, lubrication and vent systems Steve Largent Seahawks Jerseyare factored in. In fact, the motor and its systems are so advanced that an academic SAE paper is being written to explain the whole shebang. The engine will also Cliff Avril Jersey be built at the company's 75 year old Tonawanda plant, which happens to be where Chevy's original small block V8 was produced way back in 1955.
<P>"The Corvette LT1 represents the most significant redesign in the Small Block's nearly 60 year history building on its legacy to make one of the world's best engines even better," said Sam Authentic Cliff Avril Jersey Winegarden, vice president, Global Powertrain Engineering. "More than just great horsepower, the LT1 has been optimized to produce a broader power band. Below 4,000 rpm, the torque of the Corvette LT1 is comparable to that of the legendary, 7.0L LS7 out of the current Corvette Z06. The LT1 is a sweetheart of a power plant and drivers will feel its tremendous torque and power at every notch on the tachometer."
<P>Direct injection is all new to the engine architecture and is a primary contributor to its greater combustion efficiency by ensuring a more complete burn of the fuel in the air fuel mixture. This is achieved by precisely controlling the mixture motion and fuel injection spray pattern. Direct injection also keeps the combustion chamber cooler, which allows for a higher compression ratio. Emissions are also reduced, particularly cold Shaun Alexander Seahawks Jersey start hydrocarbon emissions, which are cut by about 25 percent.
<P>The LT1 head features smaller combustion Shaun Alexander Jersey chambers designed to complement the volume of the unique topography of the pistons' heads. The smaller chamber size and sculpted pistons produce an 11.5:1 compression ratio, while the head features large, straight and rectangular intake ports with a slight twist to enhance mixture motion. This is complemented by a reversal of the intake and exhaust valve positions, as compared to the previous engine design. Also, the spark plug angle and depth have been revised to protrude farther into the chamber, placing the electrode closer to the center of the combustion to support optimal combustion.
<P>Advanced oiling system, with available dry sump system: The LT1 oiling system including oil spray piston cooling was also optimized for improved performance. It is driven by a new, variable displacement oil pump that enables more efficient oil delivery, per the engine's operating conditions. Its dual pressure control enables operation Jermaine Kearse Jersey at a very efficient oil pressure at lower rpm coordinated with AFM and delivers higher pressure at higher engine speeds to provide a more robust lube system for aggressive engine operation.
<P>New, tri lobe camshaft: Compared to the Gen 4 Small Block, the camshaft remains in Authentic Steve Largent Jersey the same position relative to the crankshaft and is used with a new rear cam bearing, but it features an all new "tri lobe" designed lobe which exclusively drives the engine mounted direct injection high pressure fuel pump, which powers the direct injection combustion system. The cam's specifications include 14mm/13.3mm (0.551/0.524 inch) intake/exhaust lift, 200/207 crank angle degrees intake/exhaust duration at 0.050 inch tappet lift and a 116.5 degree cam angle lobe separation.
<P>New, 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 Cliff Avril Women Jersey 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.
<P>PCV integrated rocker covers: One of the most distinctive features of the new engine is its domed rocker covers, which house the, patent pending, integrated positive crankcase Authentic Luke Willson Jerseyventilation (PCV) system that enhances oil economy and oil life, while reducing oil consumption and contributing to low emissions. The rocker covers also hold the direct mount ignition coils for the coil near plug ignition system. Between the individual coil packs, the domed sections of the covers contain baffles that separate oil and air from the crankcase gases about three Authentic Jermaine Kearse Jersey times the oil/air separation capability of previous engines.
<P>People miss the fact that these motors that GM put out are pretty reliable, the cars themselves will die while the motors still Luke Willson Jersey keep going and they aren't sensitive like the newer turbo cars. Cheaper, lighter, smaller (than every Tony McDaniel Jerseysingle V8 on the market of its caliber).
<P>These series of V8's are used in so many import tuner and pro street applications because they just work. This is impressive as an Luke Willson Women Jerseyoverall development. I didn't expect a huge power bump just yet, but, when GM went from the Authentic Tony McDaniel Jersey LS1 to the LS3, that was a good 320 430 HP difference, looking forward to seeing what this thing does.
<P>I wonder how they managed the variable timing with the single cam. About time it gets direct injection though. Personally, I've always preferred the more "advanced" DOCH motors (the inlines in particular), Jermaine Kearse Women Jersey but I've also always been a fan of GM's small block for it's simplicity and straightforward layout (and the reliability and power that comes from it). It's the type of motor a typical owner isn't afraid of working on and I think that's something worth hanging onto. Yes, the world needs progressive powertrains like the 918's to push the industry forward, but at the same time, there's something to be said for the motor that any Joe can rip open, bump the power up, and bolt into whatever car they want. The small block has been that motor for so long and I'm glad GM is continuing with that trend.
<P>LT1 is the first of the fifth generation GM small blocks. It's reasonable to assume that by the end of the fifth generation engine's run, there Tony McDaniel Women Jersey will be a similar number of variants.

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