C6 Z06 engine breakdown
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Needs to be more Astony
Joined: October 4, 2004
Posts: 8,610
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From: Volo, IL
all i can say is WOW!!!
The LS7 shares the architecture which debuted with the celebrated LS1 in 1997, maintaining the LS1/2/6 engines' external dimensions, though nearly every component is all-new or revised for durability and power production. The block is a unique casting, designed to accommodate the 4.125-inch bore pressed-in dry cylinder liners. Main caps have been upgraded from the powdered metal material to forged steel, located and retained by dowels and six fasteners at each cap. That's some serious structure downstairs. Final block machining is carried out with torque plates installed, and main bulkhead fasteners torqued to specs.
The bigger bore is part of the equation that equals 427 cubic inches in the new LS7 - the balance is provided by the new 4.000-inch stroke crankshaft. Forged from 4140 chromium molybdenum steel with rolled fillet radius journals, it's essentially what we'd consider a race crank, far beyond the 10-series carbon steel undercut fillet forged production cranks of yesterday
While the crankshaft material is impressive, the connecting rods are nothing short of exotic, being crafted from lightweight titanium, a first for a domestic production engine. Strength, fatigue life, and weight advantages make it the material of choice over the powdered metal rods used in the other current small-blocks. Rod weight is dropped to a flyweight 480 grams, a 30 percent savings in mass.
Topping the rod is a flat-top piston helping the LS7 achieve a compression ratio of 11:1. The piston features a skirt coating to reduce bore friction, and hard-anodized ring lands, which enhance durability and temperature resistance. Note the short compression height and the lightweight reactive ring pack; pins are full-floating.
The LS7 cylinder heads are a new design, and come fully CNC ported, setting a new benchmark for 2-valve performance. These heads are a key to the LS7's power production, with intake flow rates up 43 percent compared to the LS6/LS2 cylinder heads, while the exhaust notches up for a 26percent gain. These are serious cylinder heads, even by hardcore hot-rodder standards, and are far beyond anything ever seen in production.
Reports peg the intake port flow in the area of 360 cfm as delivered at the engine's peak valve lift, putting the flow capabilities in a league of its own. Technical highlights here include a raised runner with substantially enlarged cross section, full CNC porting, a 2.20-inch valve, and valves set at a 12 degree angle, in contrast to the LS 1/2/6's 15 degrees or the original smallblock's 23 degrees. Note that the familiar cathedral- shaped entrance of the LS1 is gone.
The deep CNC-ported exhaust ports are said to deliver 214 cfm of air flow at 28 inches of water depression. Also visible here are the "Beehive" shaped valvesprings, which reduce critical mass and are less prone to harmonic disturbance than conventional parallel-wound springs. The small diameter retainers also reduce mass at the valve side of the system.
As with the other working surfaces of the LS7 cylinder head, the 70cc combustion chamber is fully CNC-ed to a glorious flow-enhancing form. The combo of 2.20-inch intake and 1.610-inch exhaust valves fills the chamber to take maximum advantage of the available bore size. The spark plug is angled towards the exhaust valve as is standard procedure in aftermarket race heads, and is positioned deep in the chamber for a quick burn. Ample quench areas at each end of the chamber maximize combustion efficiency.
The LS7 shares the architecture which debuted with the celebrated LS1 in 1997, maintaining the LS1/2/6 engines' external dimensions, though nearly every component is all-new or revised for durability and power production. The block is a unique casting, designed to accommodate the 4.125-inch bore pressed-in dry cylinder liners. Main caps have been upgraded from the powdered metal material to forged steel, located and retained by dowels and six fasteners at each cap. That's some serious structure downstairs. Final block machining is carried out with torque plates installed, and main bulkhead fasteners torqued to specs.
The bigger bore is part of the equation that equals 427 cubic inches in the new LS7 - the balance is provided by the new 4.000-inch stroke crankshaft. Forged from 4140 chromium molybdenum steel with rolled fillet radius journals, it's essentially what we'd consider a race crank, far beyond the 10-series carbon steel undercut fillet forged production cranks of yesterday
While the crankshaft material is impressive, the connecting rods are nothing short of exotic, being crafted from lightweight titanium, a first for a domestic production engine. Strength, fatigue life, and weight advantages make it the material of choice over the powdered metal rods used in the other current small-blocks. Rod weight is dropped to a flyweight 480 grams, a 30 percent savings in mass.
Topping the rod is a flat-top piston helping the LS7 achieve a compression ratio of 11:1. The piston features a skirt coating to reduce bore friction, and hard-anodized ring lands, which enhance durability and temperature resistance. Note the short compression height and the lightweight reactive ring pack; pins are full-floating.
The LS7 cylinder heads are a new design, and come fully CNC ported, setting a new benchmark for 2-valve performance. These heads are a key to the LS7's power production, with intake flow rates up 43 percent compared to the LS6/LS2 cylinder heads, while the exhaust notches up for a 26percent gain. These are serious cylinder heads, even by hardcore hot-rodder standards, and are far beyond anything ever seen in production.
Reports peg the intake port flow in the area of 360 cfm as delivered at the engine's peak valve lift, putting the flow capabilities in a league of its own. Technical highlights here include a raised runner with substantially enlarged cross section, full CNC porting, a 2.20-inch valve, and valves set at a 12 degree angle, in contrast to the LS 1/2/6's 15 degrees or the original smallblock's 23 degrees. Note that the familiar cathedral- shaped entrance of the LS1 is gone.
The deep CNC-ported exhaust ports are said to deliver 214 cfm of air flow at 28 inches of water depression. Also visible here are the "Beehive" shaped valvesprings, which reduce critical mass and are less prone to harmonic disturbance than conventional parallel-wound springs. The small diameter retainers also reduce mass at the valve side of the system.
As with the other working surfaces of the LS7 cylinder head, the 70cc combustion chamber is fully CNC-ed to a glorious flow-enhancing form. The combo of 2.20-inch intake and 1.610-inch exhaust valves fills the chamber to take maximum advantage of the available bore size. The spark plug is angled towards the exhaust valve as is standard procedure in aftermarket race heads, and is positioned deep in the chamber for a quick burn. Ample quench areas at each end of the chamber maximize combustion efficiency.
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Joined: July 29, 2004
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From: SoCal
Originally posted by RalphBullit@April 28, 2005, 11:20 AM
world-class engine,world-class sports car
world-class engine,world-class sports car
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