Prochargers on Merc 7.4MPI
#11
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Hey Eddie,
I have the same motor in my boat, and was wondering. If I rebuilt the engine, used original crank, rods with 7/16 bolts, forged pistons and maybe a little biger cam, would i be able to prop the boat for 5k RPM max? Would my HP gain be worth the effort? I'm not looking to make this boat fast, just a couple more MPH on top with reliability. The engine has over 700 hrs on it and I know the end is near!
Thanks
Charlie
I have the same motor in my boat, and was wondering. If I rebuilt the engine, used original crank, rods with 7/16 bolts, forged pistons and maybe a little biger cam, would i be able to prop the boat for 5k RPM max? Would my HP gain be worth the effort? I'm not looking to make this boat fast, just a couple more MPH on top with reliability. The engine has over 700 hrs on it and I know the end is near!
Thanks
Charlie
#12
Registered
Hey Eddie,
I have the same motor in my boat, and was wondering. If I rebuilt the engine, used original crank, rods with 7/16 bolts, forged pistons and maybe a little biger cam, would i be able to prop the boat for 5k RPM max? Would my HP gain be worth the effort? I'm not looking to make this boat fast, just a couple more MPH on top with reliability. The engine has over 700 hrs on it and I know the end is near!
Thanks
Charlie
I have the same motor in my boat, and was wondering. If I rebuilt the engine, used original crank, rods with 7/16 bolts, forged pistons and maybe a little biger cam, would i be able to prop the boat for 5k RPM max? Would my HP gain be worth the effort? I'm not looking to make this boat fast, just a couple more MPH on top with reliability. The engine has over 700 hrs on it and I know the end is near!
Thanks
Charlie
Eddie
#15
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Eddie
It is a 310 horse. Its a shame that this platform is such a weak starting point. I heard recently that this engine is a 2 bolt main. If that is correct, I might as well just look for a 454/502 MAG, and ride this one until it goes.
Thanks for the input Eddie
charlie
It is a 310 horse. Its a shame that this platform is such a weak starting point. I heard recently that this engine is a 2 bolt main. If that is correct, I might as well just look for a 454/502 MAG, and ride this one until it goes.
Thanks for the input Eddie
charlie
#16
Charter Member #1171
Charter Member
As said above,,,, that is just a bad starting platform for mods,,,, thats before you even consider the heads and injection limitations.
The plus side,,,, left alone and maintaned they about run forever !!
The plus side,,,, left alone and maintaned they about run forever !!
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#17
Were doomed!
Charter Member
Anyone have pics of a procharger setup on an MPI? I have the task of putting a box of parts together back onto a rebuilt motor...would help to have a little reference
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-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
#18
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#19
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There's no problem making big power with a two bolt block, it's just every other part of that motor that's a little weak..
#20
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Eddie
It is a 310 horse. Its a shame that this platform is such a weak starting point. I heard recently that this engine is a 2 bolt main. If that is correct, I might as well just look for a 454/502 MAG, and ride this one until it goes.
Thanks for the input Eddie
charlie
It is a 310 horse. Its a shame that this platform is such a weak starting point. I heard recently that this engine is a 2 bolt main. If that is correct, I might as well just look for a 454/502 MAG, and ride this one until it goes.
Thanks for the input Eddie
charlie