quote:Originally posted by Island Fish Lifter
the 2 stroke HPDI is a brute and will serve you well.
I dont agree with that either.
Fill the dam tub!
[/quote]
Look up the boat tests and reports on yamahas website, nearly every larger boat with larger hp hpdi's have better mileage (if they are still on there, not sure if they only host 4-stroke reports now) its fact, not rumor.
Just another point on the HPDI's, i was in renfrew this summer talking to a guy about the new fuel injected 2-strokes (a guide to boot) when a boat with a 150 yamaha pulled up to the dock, and he pointed at it and said, see how quiet those new 4strokes are - needless to say i walked away with 5$ after we walked over and i showed him it was an hpdi.
From Etec (biased of course, but you get the idea):
Abbreviations: EPA, Environmental Protection Agency. CARB, California Air Resource Board. EU, European Union.
Myth #1: The 2006 EPA and EU legislation makes 2-stroks illegal.
Fact #1: There is nothing either in the EPA, CARB or EU outboard emissions legislation that will ban the use of any outboard motor on any waterway. EPA, CARB and EU do set limits for engines to be sold by the effected date of legislation. The legislation enacted by the U.S. Environmental Protection Agency (EPA) and The California Air Resource Board (CARB) as well as EU Recreational craft directive REGULATE EMISSIONS AND NOT TECHNOLOGIES.
Myth #2: The EPA and EU legislation makes the sale and use of 2-stroke outboards illegal after 2006
Fact #2: Outboard manufacturers are required to comply with U.S. EPA legislation through a corporate average. Any existing outboard model and its technology sold to the end user prior to the effective date can be used beyond 2006 under both EPA and EU legislations. No outboard brand or technology will be outlawed!
Myth #3: 4-stroke outboards achieve the best fuel economy.
Fact #3: Both 4-stroke and direct injection technologies achieve high levels of fuel economy. In fact, recent magazine tests have shown that direct injection outboards actually achieve higher levels of fuel economy and efficiency than the same horsepower 4-stroke model!!
Myth #4: 4-stroke outboards are cleanest available.
Fact #4: 4-stroke and direct injection outboards are extremely clean technologies. 4-stroke models tend to have a slight advantage in the hydrocarbons (HC) category, while direct injection models tend to have the advantage in the carbon monoxide (CO) and oxides of nitrogen (NOx) categories Both technologies comply with U.S. EPA 2006, EU 2006 and CARB 2-star and 3-star ratings depending on the model.
Myth #5: The CARB STAR ratings apply world-wide.
Fact #5: The CARB STAR rating applies only to outboards sold in the US State of California and has nothing to do with the EPA or EU 2006 / 2005 Recreational Craft Directive.
Myth #6: Only the 4-stroke technology can achieve the California Air Resource Board (CARB) 3 STAR Ultra Low Emissions certification.
Fact #6: There are CARB 3 STAR certified direct injection outboards being sold today including the Evinrude E-Tec engines
Myth #7: 4-stroke outboards are the lowest maintenance outboards.
Fact #7: Today's 4-stroke and direct injection outboards are both low maintenance products compared to what was available in the industry ten or more years ago. Unlike 4-stroke outboards, Evinrude outboards with direct injection and Evinrude E-Tec outboards have no valves to adjust, no crankcase oil that needs changed, no timing belts or chains that require replacement. This equates to more time on the water for the customer and lower maintenance costs over the engine's life.
Myth #8: 4-stroke technology makes more torque than other outboard technologies.
Fact #8: While most 4-stroke outboards perform at acceptable levels, when comparing equal displacement engines, 4-strokes develop significantly LESS torque at the same RPM than competitive technologies. This is due to the inherent nature of the technology. A 4-stroke makes a power stroke every other revolution of the crankshaft while 2-stroke and direct injection technologies make a power stroke every revolution.
Myth #9: 4-stroke outboards do not consume oil.
Fact #9: According to Southwest Research Institute, a Government approved emissions testing lab, a competitors 115hp 4-stroke outboard engine consumed 4.9 quarts of oil in 100 hours of testing. The oil capacity of the engine is only 4.8 quarts.
Myth #10: 2-stroke outboards expel oil directly into the environment.
Fact #10: The oil in a direct injection outboard is combusted in the cylinder the same way the fuel is and is accounted for already in its emission rating, while 4-strokes need to dispose of the used oil in the crankcase at the time of service.