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Discussion Starter · #1 ·
GM makes a 525HP 8.1 for marine use based on the stock 8.1 truck block. When will this be available for trucks? How about a GM parts upgrade kit for trucks (off road use only of course)? It appears that it uses the same heads which are "port matched". Does that mean larger ports? Also, what about the intake manifold and throttle body? It definitely has a larger cam with roller rockers. I could sure use something like this. Anyone have any inside scoop?


04 yukon XL 2500 8.1 3.73 SLT
 

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I don't know much of the details but I'm going to assume that it's 525HP because marine engines don't require the restrictive exhaust and cat on them and can therefore breath much easier. Also, I hate to burst your bubble but last I looked these engines (as a marine crate form) were creeping in on $20K.
 

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Discussion Starter · #3 ·
I'm not really interested in buying the marine engine, but the parts should bolt onto the stock truck block. And, the HP is not just due to unrestricted exhaust. The 8.1 at 496 cubes is very underutilized in stock form.
 

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Discussion Starter · #4 ·
Here are the details

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.

"We've incorporated all the strengths of the Vortec 8100 truck engine into the Vortec HP3 marine engine, including the emissions and fuel economy improvements we've 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.

"What's impressive is that the HP3's 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 today's market."

The Vortec HP3's 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 HP3's 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.
 

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Discussion Starter · #5 ·
Here are the HP and Torque figures.

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 GM's 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 what's 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 Vortec an offshore racing engine. 8100 In fact, the engine is currently being tested in the American Power Boat Association (APBA) Offshore Racing Series.
 

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