Mercruiser with catalytic converter

[agallant80]

These things are so new I am having a hard time finding any info on them. I can't find any threads of people having issues with them which I would assume is good. I would like to have some idea how long they will last before they have to be replaced etc. I would love to know is if when they need replacing if I can just put on the normal manifolds and risers. Anyone have any info on these?

 

[55evinrude]

Re: Mercruiser with catalytic converter

These things are so new I am having a hard time finding any info on them. I can't find any threads of people having issues with them which I would assume is good. I would like to have some idea how long they will last before they have to be replaced etc. I would love to know is if when they need replacing if I can just put on the normal manifolds and risers. Anyone have any info on these?

there isn't a lot of info on them yet because they are so new.... as far as how long they will last, nobody really has that answer the tech at the dealer said 8 years but who knows (when you think about it a catalytic converter last a long time in a car) but in a boat they mileage may vary.

I don't think you can just swap them out to regular risers n' manifolds because of the o2 sensors. my advice is if your looking at a new boat try to get one without them and wait until they have been on the market for a few more years.

Nathan

 

[Don S]

Re: Mercruiser with catalytic converter

I doubt converting will be a simple process. There is 4 O2 sensors and two temp sensors not found in the old style manifolds. Those 6 sensors feed information to your PCM, without that info, you probably won't have a very good running engine.

How long the last? They have only been in use since late 09, early 2010, so wearing out probably hasn't happened to anyone yet.

 

[dubs283]

Re: Mercruiser with catalytic converter

you cannot run a catalyzed engine without a catalyst in place

the pcm needs to see information from the sensors based on pre and post catalyst exhaust, otherwise mulitple codes/faults will be set and the eninge will run poorly or not at all

as far as info from owners on catalyzed engines i doubt you will find much as most or all of these engines are still under warranty and issues are resolved at dealerships - also the diagnostic tools required for catalyzed engines are quite specific and not designed for the "everyman" to utilize for troubleshooting

 

[agallant80]

Re: Mercruiser with catalytic converter

Well I guess on the bright side CO emissions on these motors are down 70-90% according to boattest.com. I guess that is good for a cruiser.

 

[muc]

Re: Mercruiser with catalytic converter

So far the biggest problem seems to be weeds plugging up the cooling to the cats.
I’m guessing some sort of strainer system will have to be developed.

 

[haulnazz15]

Re: Mercruiser with catalytic converter

I am sure you could use "emulators" to fool the ECU into thinking the sensors are operating properly by basically having a resistor in the wiring harness. They are commonly used with autos that have had the cats removed for whatever reason. The ECU would just see the emulator reporting back a value close to stoic, and would run in normal fuel mode. Granted it's not really "emissions legal", but I would imagine that would be the simple way to do a non-cat retrofit.

 

[Tail_Gunner]

Re: Mercruiser with catalytic converter

If it is not illegal to do so it would entail swithcing over to a new ecm and exhaust stem. I have no ideal of the cat cost but 1800 should get you out of those thing's. But you could still make use of the os sensors...it would be a intresting conversion.