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Is this the new Merc. 525?

Old 06-20-2002, 01:36 PM
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Question Is this the new Merc. 525?

GM Powertrain Prepares To Launch Its Most Powerful Production Engine

Vortec HP3 8100 V8 Draws on Success of Vortec 8100 Truck Engine

PONTIAC, Mich. -- GM Powertrain will be introducing a high-performance Vortec HP3 8100 V8 marine engine, which will produce the highest output ever offered by a GM Powertrain production engine, to the marine market as part if its 2003 marine engine lineup.

Targeted for the performance recreational marine market, the Vortec HP3 is also proving to be a serious racecourse contender, straight out of the box. Currently undergoing validation testing, the Vortec HP3 produces more than 525 horsepower and more than 525 lb-ft of torque.

The Vortec HP3 is GMs third marine power offering from a common 8.1-liter architecture. The Vortec HP1 and HP2 marine engines produce 375 horsepower and 420 horsepower, respectively. The Vortec 8100 offered in both the Chevrolet Silverado and GMC Sierra produces 340 horsepower.

"This latest increase in power reflects a 40-year trend of continuous development and improvement, and hints at whats to come from GM," said Rick Dunagan, GM Powertrain executive director of OEM sales and marketing.

Developed from the Vortec 8100 V8 truck engine, the 8.1-liter Vortec HP3 combines the reliability, durability and quality of a proven production powerplant with the performance characteristics of an offshore racing engine. In fact, the engine is currently being tested in the American Power Boat Association (APBA) Offshore Racing Series.

In 2002 APBA racing events, Vortec HP3-powered boats captured first and second place finishes in the APBA race in April in Daytona Beach, Fla. Three weeks later, in the second APBA race in Marathon, Fla., Vortec HP3-powered boats went on to capture a first, and two second place finishes. In the third and most demanding APBA race to date, held June 7-9 on stormy Atlantic seas off Cape Cod, Mass., Vortec HP3-powered boats took two first and two second place finishes.

GM Powertrain engineers call the Vortec HP3 a breakthrough because it is versatile enough to dominate the racecourse on Sunday, and still go cruising during the rest of the week.

"Its mild mannered and behaves when you want it to, but light the wick, and make sure its pointed where you want to go," said Dunagan.

Based on the largest light truck cylinder block in the GM Powertrain lineup, the Vortec HP3 provides checkered flag performance in a factory design. The Vortec HP3 represents the next step in big-block power, responding to growing market demand for increased performance.

Progression of Performance Development


8.2 Liters

1999 / 2000
8.2 Liters

2001 / 2002
8.1 Liters

8.1 Liters

Performance features specific to the Vortec HP3 include a virtually seamless, precision-matched intake manifold and cylinder head ports for optimum flow characteristics, providing improved power and torque, particularly where boaters need it for hole shots and acceleration maneuvers.

The fuel delivery system includes a 75-millimeter marine throttle body unit with an HP3-specific 400 kpa fuel rail, providing a pressure increase of more than 30 percent over the standard Vortec 8100 production engine. Computer ignition and fuel management parameters are calibrated to provide the best possible performance characteristics across the entire powerband.

The Vortec HP3s valvetrain is performance matched throughout, with a high-lift and high-duration camshaft; premium race-style valve springs; 1.7:1 ratio roller rocker arms; dedicated rocker arm studs; and HP3-specific intake and exhaust push rod. Performance is also enhanced with a dedicated HP3-tuned harmonic balancer, and individual ignition coils for each of its eight platinum-tipped spark plugs.

" Weve incorporated all the strengths of the Vortec 8100 truck engine into the Vortec HP3 marine engine, including the emissions and fuel economy improvements weve made over the years," said Terry Andrzejewski, GM Powertrain Vortec HP3 8100 development engineer. "Then we went back and pushed those strengths to an even greater level.

"Whats impressive is that the HP3s performance comes from a naturally aspirated design based on a stock truck engine block. So it offers the performance of a marine racing engine with durability of a recreational marine engine, attributes that are unparalleled in todays market."

The Vortec HP3s performance and durability is derived from an impressive list of features.

Key features include:

Specific machined steel camshaft and crankshaft timing sprockets
Five bearing crankshaft with four-bolt, cast iron bearing caps
High volume oil pump with weld-reinforced shroud, pickup tube and screen assembly
Double roller timing chain
Coated cast aluminum, 8-quart oil pan with full baffle
Port and starboard 12mm drain plugs
Sintered, powdered metal exhaust valve seat inserts
Crankcase ventilation integral to intake manifold (requires no PCV valve)
The new Vortec HP3 engine also will be available with a remote oil cooling system with all connections and system wiring, a dedicated marine fuel system, as well as a specific performance marine alternator, starter, flame arrestor and 142-degree Fahrenheit thermostat.

Even though it is built to deliver thoroughbred performance, the Vortec HP3, with its 9.1:1 compression ratio, is designed to run on regular unleaded fuel available at marina gas docks.

GM Powertrain has tasked Innovation Marine in Sarasota, Fla., to add the performance enhancements to the Vortec HP3. Because of the HP3s race boat and recreation boat dual personality, GM Powertrain expects to see considerable demand for this performance marine engine once production begins.

"The new Vortec HP3 will be available to our existing OEM marine engine distributors," said Dunagan. "From the start, the focus with the Vortec HP3 has been to meet market demand for more power from the factory. The Vortec HP3 clearly achieves that objective while increasing product value for our customers."

GM Powertrain engineers also pointed out the synergistic benefits of developing both automotive and marine engines. Information gained from automotive engine development is applied to marine engine development. In turn, information gained from marine engine development, where conditions are much more severe, is driven back to automotive engine development for improved product quality. The new Vortec HP3 was built on the strengths of the Vortec 8100 truck engine. Design improvements realized from the development of the Vortec HP3 marine engine will be used to further improve the quality and performance of the Vortec 8100 truck engine.

GM Powertrain is a global producer of engines, transmissions, castings and components for GM vehicles and other automotive, marine, and industrial OEMs. Headquartered in Pontiac, GM Powertrain has operating and coordinating responsibility for General Motors powertrain manufacturing plants and engineering centers in North America, South America, Europe, and the Asia-Pacific region.

2003 Vortec HP3 8100 V8


Product Specifications

Type: 8.1L V8
Displacement: 496 cid (8128 cc)
Compression Ratio: 9.1:1
Valve Configuration: Pushrod Actuated, Canted Overhead Valves (2 per cyl)
Manufactured: Tonawanda, New York
Marine Applications: Innovation Marine Engine Company (Sarasota, Fla.)
Valve Lifters: Hydraulic Roller
Bore & Stroke: 4.25 x 4.37 in (107.95 x 111.00 mm)
Firing Order: 1-8-7-2-6-5-4-3
Crankshaft Main Bearings: 5
Main Bearing Caps: 4-Bolt
Engine Rotation: Clockwise (Facing Front)
Balance Method: Internal
Oil Pan Capacity: Level - 8 qt (Inclined 7 qt)
Oil Type: Mobil One 15W-50 Synthetic
Emissions Controls: Internal PVC Orifice System
Intake Manifold: Factory PFI (Equal Length Runner), Port Matched to Head
Fuel System: Port Fuel Injection
Fuel Type: Gasoline (Unleaded)
Spark Plugs: Platinum Tipped (1.5-mm gap)
Paint Protection: Component Painted
Shipping Weight: TBD
Horsepower: 525+ @ 5200 rpm
Torque: 560+ @ 4000 rpm
Horsepower and torque numbers are based on GM dynamometer testing of the factory- installed PFI intake manifold.
Actual power levels may vary depending on OEM calibration and application.


Block: Cast Iron
Cylinder Head: Cast Iron (with exhaust valve seat inserts)
Intake Manifold: One-Piece Coated Cast Aluminum
Main Bearing Caps: Cast Nodular Iron
Crankshaft: Cast Nodular Iron
Camshaft: Steel
Connecting Rods: Forged Steel 1141 SAE (shot-peened and magnafluxed, with 9-mm diameter connecting rod bolts)
Pistons: Hypereutectic Cast Aluminum
Information may vary with application. All specifications listed are based on the latest product information available at the time of publication.

Last edited by RickS; 06-20-2002 at 01:42 PM.
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Old 06-20-2002, 02:11 PM
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Not sure if this will be the HP525, possibly, but it's interesting that the HP3 has a cast crank and not forged like the HP2(496HO).
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Old 06-20-2002, 03:10 PM
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Marine Applications: Innovation Marine Engine Company (Sarasota, Fla.)

I would think they would list Merc if it was one of theirs too
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Old 06-20-2002, 03:38 PM
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I thought the new 525 was essentially the same as the HP500EFI with closed cooling, different exhaust, and a different throttle body.
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