Please click on...


http://www.epa.gov/otaq/regs/nonroad/marinesi-equipld/420f08013.htm

The part where it says "closed loop fuel injection" caught my attention. Does this mean the fuel tank venting? In other words, a sealed system like a car has?

If so that may take more developement as well to make it work in a marine environment.

Nope,
A closed loop system has a feedback from the exhaust (the O2 sensor) to the computer to tell the Fuel Injection system how much unburned fuel is left after combustion. The computer then adjusts how much fuel to send to the injectors for maximum efficiency.
In an open loop the computer just uses inputs from the intake side to estimate how much fuel to give at various RPMs.
Closed loop is better for power and efficiency, but requires the addition of the O2 sensor and probably other systems.

more expensive to build, and buy, and much more expensive to maintain. Thanks big brother.

+1

Sad to see this coming. So so insignificant in the world picture. Some tree hugger got their way at the expense of a more expensive product for such a small community of us boaters compared to the rest of the USA and world

Closed loop provides about a 5-15% increase in fuel efficiency.

I like the idea, D-Rod, but not the expense it's taking to get it. And 5-15% of 4mpg is not all that significant as a whole. (I used your logic on my dad when he spent $200 on an IAC for his 350MAG MPI and the economy only went from 2 to 2.2. I said" But Dad, it's 10%!" He felt better)

If you burn 1000 gallons per year currently, with a closed loop you might burn closer to 900 gallons.

1000* $4 = $4000 in fuel.
900*$4= $3600.

Can't ignore that.

Also cannot ignore the advantages of tremendously reduced CO dangers.

So............. I could go from 2mpg to 2.3mpg????

Great, wonderful!

An extra 2 miles from my 20-gal fuel tank!

Sign me up today!.





No D-rod, I really don't care.
More compleity = more components to fail = more components to have to diagnose - more components to replace = NONE of those components are inexpensive = FAR more hassle.
I'll keep my simple old boat, with no warning alarms, no computers, no O2 sensors, NO CAT'S, and it just keeps on running.

So what ARE the CO dangers on a MOVING boat? (and disregard the "teak surfing" hazzards, that's not a CO hazzard, that's stupid deepening the gene pool, and should not only be allowed, it should be actively promoted)

I personally would like it as an option.
This allows the aftermarket to come in with some performance enhancers to increase power and efficiency.
As an option it is then my choice, and I choose MORE POWER!
I used the money saving argument when deciding on a diesel truck then watched the price of diesel go through the roof. The money is insignificant... it's the power and pleasure that counts when using toys such as boats and motorcycles.

I remember when MPI/EFI were beginning to spread in the marine world. At the time, many thought it was a pure waste of money and unnecessarily complex.

What is now a popular?

Adding a exhaust O2 sensor adds about nothing to the complexity of the system. Reconfigure of the ECM's algorithm to adjust based on the comparison of two inputs verses mapping one input to table of pre-determined values once the O2 sensors begin transmitting input.

The cat itself isn't that "complex" . The most complex part of that system is the water heat barrier. It's not like you're going to be able to run your engine without the impeller pumping cooling water through the engine. I think the idea that cats will overheat is a load of bull. Cat or Catless, if an impeller starts to fail, you have problems regardless.

Explain to me where the "much more maintenance" comes into play???? I actually argue the opposite. I argue these engines require LESS maintenance.

The one X factor is how the new manifolds are constructed. If they're freshwater cooled, that will prevent the "extra replacement cost" argument. If they're raw water cooled but designed so that the catalysts can be removed and transfered to the new exhaust manifolds, the cost increases are minimized.

Less maintenance? If they're freshwater cooled, that's ONE less part to worry about for those in salt water.

Closed loop system burn hotter and more efficient. This prevents carbon build up.

The closed loop system also allows for the ECM to monitor combustion efficiency and can alert the user when somethings gets out of parameters via a check engine light or IEMA 2000. It could prevent a major failure by detecting it sooner.

One more thing: Maybe seabuddy or someone has statistics on this. On average, I bet about 30% of a boat's engine hours are at idle speed. CO reduction please. Safety is safety.

Lawnmowers and boats account for 1/4 of "mobile" air pollution? OMG, I need to stop laughing so I can get my work done and go boating...

Higher Hp engines get a break on all the new stuff for awhile. Change is coming. Buy now (or keep your boat forever?), if you do not want it.

So are you going to have to get your boat 'smog tests' like you do your cars? If not, how are they going to regulate it and make sure your engine is operating properly and not chugging out pollutants?

Sounds like a crock of carp to me...IMHO