2400sc side exhaust

[MaxumumVelocity]

wanting to do a side exhaust setup because I don't think I will have room for through hull out the back. Im just wanting direct exit and no captain call. What would I have to do with the outdrive once I move the exhaust from there and over to the side? also how high above the waterline do I need to mount the tips?

Boat info: 91 2400sc 7.4l merc fuel injected

[mmwjr]

The exhaust y-pipe needs to be removed from the inner transom assembly and a block off plate installed that mercruiser sells. Engine will need to come out to do this. You could leave the y-pipe in and figure out how to cap it off but it will look hookie.

Regarding the exhaust tips the manufacture should have instruction for placement.

[shrew]

What purpose would this serve? You just bought a 26 year old boat. There is no shortage of places to spend money on a boat, particularly one that is 26 yrs old.

My advice would be to run the boat for a season and build a realistic 'Need vs. Want' list.

[donald]

With the noise that you will make the water cops will be all over you!
Don't do it!
Just my 2c!
Don

[MaxumumVelocity]

Thanks for the input guys. The lakes I frequent I haven't seen anyone messed with over noise. there are quite a few guys with open exhaust. the boat ive been on the last 2 years has a 454 with through hulls and never been bothered.

[shrew]

Originally Posted by MaxumumVelocity

there are quite a few guys with open exhaust.

This would be like taking a Honda Civic and wrenching on it like a 'Fast an Furious' wannabe. Big 'fart can' exhaust, street racing tires, aftermarket airfoil, etc.

Don't succumb to fear pressure. OR, did you buy the right boat for YOU?

I'm not worried about noise. I'm more concerned with the inevitable and looming re-power that comes with a 26 yr old gas marine engine. These engines typically get around 500 hrs. There are many examples of more hours, but they are still statistically the exception.

[Phillbo]

Really.. 500 hours? My 6.2L has 640 hours on it and purrs as well as it did when I bought it. I've always been under the impression we should expect well over 1000 hours before a rebuild is needed.

As to the noise of the open exhaust, think about the people trying to experience a nice quiet day on the lake.

[mmwjr]

IMO a well maintained engine should get 1000 - 1500 hours. However many unknowns when buying a used boat. My 97' only had 163hours when I bought it in 2008 and at ~450 hours the main bearings were shot last year. I told myself this was probably due to lack of oil changes by the PO since he did not use it much as well as dry starts since the engine sat for long periods. At 26 years old anything can happen at anytime.

[bman440440]

well I know I got over 3000 hours out of my 4.3 before I had to rebuild it due to my error... I just changed the oil/plugs/cap&rotor every season

[mmwjr]

Originally Posted by bman440440

well I know I got over 3000 hours out of my 4.3 before I had to rebuild it due to my error... I just changed the oil/plugs/cap&rotor every season

Freshwater boat?

[bman440440]

Originally Posted by mmwjr

Freshwater boat?

no... 95% salt water use... I flush with salt away after every trip and I did replace manifolds every 4-5 years (800-1000 hours)

[mmwjr]

Originally Posted by bman440440

no... 95% salt water use... I flush with salt away after every trip and I did replace manifolds every 4-5 years (800-1000 hours)

Wow 200 hours a year! I boat nearly every weekend of the season and only put around 50 hours a year. I do spend time at anchor and drifting.

[bman440440]

Originally Posted by mmwjr

Wow 200 hours a year! I boat nearly every weekend of the season and only put around 50 hours a year. I do spend time at anchor and drifting.

yes I know its a lot of hours per year... here in San Diego we can be on the water 9 months a year most years... and on a fishing trip out off the coast anywhere from 9-30 miles out (and yes I pick my days... only great weather on the 30 mile off shore trips) we get on the water at 4 AM and off the water at 6-7 PM and some days the motor is going the whole time so it adds up fast! some years I change my oil and do my maintenance every 3 or 4 months!

[shrew]

Originally Posted by shrew

There are many examples of more hours, but they are still statistically the exception.

Please don't read part of the reply and ignore the other parts. I did try to clarify it. Simply dig through boats.com or yachtworld and look at the number of boats that report having been rebuilt or repowered around the 10 year mark. I can also show you an example of a guy with a 1992 vessel with original 454's. I raft with another guy with the exact same boat 4 years newer who has replaced 3 engines.

I blew a 454 at around 350 hrs. That was a result of the previous owner overpropping it.