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Input needed on Engines

C

captainron19

New member
I Have a 1989 23' Robalo 2320 with twin 1989 Mariner 150HP v6 engines.
Bought it a few months ago and one of my engines blew a piston the other day....just my luck
Took it to a mechanic and it is un-repairable and gonna cost close to 6K to re-power but probably not worth it since the engine is a 1989
My mechanic recommended I look into going to 1 single larger engine and get rid of the older twin 150's
If I choose to go to one single larger engine....what would be my ideal size for a 23' Robalo 2320. I am guessing a 225 HP should do the job but not sure.
Also, if I choose that route.....what would I expect to get for the both engines if I choose to sell to offset the cost. One has an obvious blown piston but compression good in remaining 5 cyclinders. Did a compression test on good engine and all 6 cyliders were in 120-125 range and that one runs fine. Both engines are Mariner 150hp v6
Any input would be appreciated.
 
Took it to a mechanic and it is un-repairable...
Click to expand...
Why? He wants to sell you a new engine?
what would be my ideal size for a 23' Robalo 2320. I am guessing a 225 HP should do the job but not sure.
Click to expand...
You are running 300 HP now w/two engines...weight for both about 1,000 lbs.? I would prefer having a stallion pushing my boat than a pony. That way I can get to the stable in a hurry if I need to get off the water in a hurry. Consider 275 HP vs. 225 HP. You don't have to run the hell out of a 275 HP except when necessary to chit-N-get! Someone may buy both engines to have a spare for parts...maybe a few thousand...whatever you can get for them. Make darn sure the holes in the transom are repaired professionally and not just plugged w/a dowel pin and caulked.
 
My brother had one of those with a 225 hp John-RUde on the back. It's a heay boat, so performance was far from sparkling, and it burnt fuel like crazy!

As I see it you have two sensible options:

1. Find another identical used Mariner or,

2. Replace both with a new, fuel efficient, two stroke or (God help me!) four stroke.

Either option is expensive: the first in gas usage (as you probably know by now), or $$ outlay for a new, 250 hp (minimum) motor.

Good luck!

Jeff

PS: Do NOT in any case rebuild that blown motor! That's the worst option of all.
 
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