Repower for 23' I/O
 

In a mixed up state of mind. Latest project is a 73 cc with a monster consul. Present power is a small block of unknown HP.
This baby is totally locked up.
I have been considering a 225 mpi V6 power plant.
Do you guys and gals think this would work or should I go with a another small block??
All input gladly accepted.

Re: Repower for 23' I/O
 

V-8 all the way

Re: Repower for 23' I/O
 

350 mpi is a great match in my opinion

Re: Repower for 23' I/O
 

I have a Scepter with a 260 Volvo I/O. While it does well, these hulls like HP to work their magic. I also have 144 gal. fuel plus the usual "other" stuff.

My 290 VP outdrive can handle substatially more than the 260, so I'm planning on 310+ HP when the time comes and if it ends up being fuel injected it could reach 350 ish or 30+% increase. JMHO.

Re: Repower for 23' I/O
 

Go with an injected V8. The torque difference is important in getting on plane. With today's materials and technology, a 350-375hp small block is as reliable as the 260hp motors of 35 years ago.

Re: Repower for 23' I/O
 

I have a 350 mpi fwc in mine,its a great match for the hull.
Pulling it out for a diesel engine I just got.Will sell the whole package engine,transom assembly and drive

Re: Repower for 23' I/O
 

Thanks for your input. Looks like the sbc is the way to go.
Wags sent pm re: your engine/drive package.
More questions will be forth coming as soon as the white stuff melts a little.

Re: Repower for 23' I/O
 

Its the mag 350 300hp

Re: Repower for 23' I/O
 

for what it's worth...

my sea craft,it's powered by merc 5.7MPI with the horizon package,bravo I drive - in my opinion,this is the best option,performance,and effciency wise.the boat gets over 2nmpg,cruises @23-24kts,and the engine runs up to it's 5000rpm limit,as it should.the engine has ran for 335 trouble free hours in the last 3 seasons.i've used these engines in numerous other repower projects,with,similar good results.
if you're not running a bravo drive,i suggest you purchase a package-"package" being engine,drive,transom plate-reason being-if you're equipped with an alphaI drive,the water pump in the alphaI drives,are,low volume,high pressure pumps,the newer vortec engines require a large volume of water,using the newer vortecs and the older drives,will cause a problem with the engine blowing head gaskets...

here's a recent trip i made on my rig - http://www.facebook.com/#!/pages/spo...n/345108625395

we ran inexcess of 62nm to the fish,the engine was never shut down-fired up @ 4:30,shut down @ 3:30 total trip distance was 125-out and back,and running and difting...total fuel used was 52g...


that v6 is a reliable engine,very powefull,but,it just doesn't have the torque needed to shove that hull..

Re: Repower for 23' I/O
 

I run mine with the alpha and a thru hull(sea strainer) to the raw water pump (bravo engine).

Re: Repower for 23' I/O
 

that's ok...but...you need to instal the [censored] interupt on the new engine.also,you need to install the block off for the cooling water tube-from the swivel assembly,to the engine.you're also gonna need to remove the water pump impeller from the drive...

Re: Repower for 23' I/O
 

Pelican your right on.I put the shift interrupt switch in and mechanic said to just leave the alpha impellar in and let run rather than block it off (cools drive?).

Re: Repower for 23' I/O
 

waterpump in ?? where does the water exit ?
if you still have the water pump -the water is forced up the drive...now,there's the transfer hose-from the swivel assembly to the transom plate-where it connects to another tube-another hose connects to this,and,this feeds the engine water...my question is,where does ths water exit,in your set up ?
normally,if you're going this route,you pull the impeller out-remove the transfer hose-swivel to transom plate-install the block off piece-inside the transom assembly-this is the accepted way to do this.the hose is removed-water is forced up the,via the water intakes,on thelower unit,and,this water exits @ the swivel assembly...

Re: Repower for 23' I/O
 

Water exits the hose set up on drive.I heard of just capping the hole too but mech said just let it run outside the transom. Drawback being it now takes two two hoses to run on land.One for raw water pickup and one for outdrive

Re: Repower for 23' I/O
 

doesn't sound like a good set up,huh ? the best way,is the way i explained...you seem to have found that out... :rolleyes: