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Mhenry1282

350 hp increase

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We have a signature 270 with the 5.7 gxi-j. Lost a line from the remote oil filter, dumped all the oil in the bilge, and didn't know about it until it started to come off plane. Pulled up the oil press, saw 6 psi and immediately shut it down. But, not before a rod got pissed. Rebuilding the motor as soon as I can pluck it out. Are there any upgrades, ecm tuning, cam, etc? Right now it cruises at about 24mph at 3500ish rpm. I'd like to be able to cruise at 30, without beating the snot out of the motor. I only have a few hours on the boat, the PO obviously didn't take good care of it. Motor has about 400 hours. Coolant lines were clogged and manifolds were rusty and filled with melted rubber. Have new Volvo manifolds and risers on now, but got a bad rod knock after dumping the oil. Getting the 350 rebuilt and wondering how much is possible with the ecm as far as tuning with hp upgrades. Any advice would be appreciated!

 

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Over heated engines in my opinion cost WAY  WAY to much in labor costs to be worth a rebuild.  Warped surfaces, cylinder heads,  Cylinder walls.  The block can even have a misalignment between the front, center, and rear bearing surfaces of the block. Requiring a " Line Boring " To be done. The cylinder heads can be " Bent " .  Camshaft bearing alingment.    Requiring a Line boring also.   Cooked engines EAT man hours of money............ Just found out we also need to do this step also............

50 hours of repaired  running reveals......... I should have bought a new engine............. What happened to all the sensors temperatures ?  ....... There is nothing you can depend upon.

Save a bundle.    Buy the engine that is the horsepower you want . That simply bolts to the drive you have.

 

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