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Old 07-10-2008, 02:39 PM
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Default CNG for boat engines.

Was just looking at T. Boone Pickens idea for using Compressed Natural Gas for a highway vehicle fuel. Pickensplan.com

Seems to me like the boating propulsion industry would be a better starting place for CNG fuel conversion than on road vehicles. Less likelyhood of a severe collision that could damage a pressurized fuel container...reduced risk of liquid spill of un-environmentally friendly fuel on the water. Atmospheric emissions are apparently very clean when compared to liquid petrol power.

Has anybody ever seen a CNG outboard motor? I think that would be a super cool idea.

Your take?
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Old 07-10-2008, 02:43 PM
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Default Re: CNG for boat engines.

I would think that the size of the tank might be a problem, but who knows!
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Old 07-10-2008, 04:03 PM
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Default RE: CNG for boat engines.

Would definitly have limited range and could be hard to detect leaks in equipment. Severe explosion hazard I would guess.
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Old 07-10-2008, 05:00 PM
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Default Re: CNG for boat engines.

Natural gas is nowhere near as volitile as gasoline. It only ignites between 4% and 14% mixture with air. It has to be compressed to about 2500 psi to get any kind of range out of it.
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Old 07-10-2008, 05:34 PM
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Default Re: CNG for boat engines.

There are countries that have already made the switch to CNG powered vehicles.

And apparently already quite afew here the US:
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Compressed natural gas (CNG) vehicles are far from novelties -- there are more 110,000 on American roads, and frequent flyers have likely been in one without knowing it. The vast majority of CNG vehicles are taxis or shuttle vans used in corporate or government fleets. Many states mandate the use of the cleaner-burning CNG vehicles at airports to limit the amount of greenhouse emissions.

But CNG vehicles aren't for drivers who spend hours a day behind the wheel. They have a maximum range of about 200 miles between refueling, and fleet owners have to pay between $6,000 and $25,000 for a refueling station.

Individuals who own CNG vehicles must visit one of the 1,600 public or private natural gas stations in the United States. Refueling stations are primarily located along the coasts or near environmentally conscious areas like Salt Lake City or Denver.
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Old 07-10-2008, 05:52 PM
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Default Re: CNG for boat engines.

Why bother compressing it? Just get a huge sack like on these chinese buses. http://www.paulnoll.com/China/Excurs...g-gas-bus.html
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Old 07-10-2008, 06:13 PM
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Default Re: CNG for boat engines.

The power output is lower..CNG has a lower BTU content.
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Old 07-10-2008, 06:48 PM
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Default Re: CNG for boat engines.

Quote:
newlyn - 7/10/2008 5:52 PM

Why bother compressing it? Just get a huge sack like on these chinese buses. http://www.paulnoll.com/China/Excurs...g-gas-bus.html
WOW!!!

Now that is utilizing your resources at it's finest! However, I don't think you will be seeing anything like that in the US any time soon! I guess it would make a good excuse for an extra large t-top...

Seriously though, I have often wondered why cng was not more widely used as a vehicle fuel. It is readily available from wells throughout North America, there is a reliable system to transport CNG from the wells all the way to the resellers. It is (or at least was with carbs) easy to convert a vehicle to use CNG. And it is lighter than air so you don't have the issues that you can have with propane. I guess the downside is the high pressures needed for storage, the high volumes needed, and the lower btu content.

The whole alternative fuel issue is moot until consumers decide what they want to buy. Right now, consumers want to buy gasoline and diesel so that is what is being supplied. When enough demand for an alternative fuel develops, then someone will decide they can make money selling it and provide it (whatever "it" happens to be). That is basically why the hybrid cars have taken off. And remember that alternative fuels have been around since before they were alternative ( http://www.stanleysteamers.com/ ), it just happens that gasoline and diesel were cheap and easy so they became popular.
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