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Alumacraft MV1448 Seadoo IB jet, Still jetting
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<blockquote data-quote="PSG-1" data-source="post: 330112" data-attributes="member: 6937"><p>I'm using an XL1200 pump, with the .700" diameter shaft (there were 2 sizes, if I remember correctly, I think the other one was .750") I think the rev limit on most direct drives is around 8K. Above that, I think the impeller would start to cavitate, and vibration caused by it at those speeds is probably more apt to cause damage. Just an educated guess, I may be wrong about that.</p><p></p><p></p><p></p><p></p><p></p><p>My boat's a little funny about how you have to remove the pump, too. Since I cut the driveshaft and pump housing short to allow the FXHO to fit within the existing engine compartment, there is no shaft exposed above the pump housing, the engine coupler screws directly onto the threads. As a result, I had to cut wrench flats on the driveshaft, behind the bearing area, which means to put a wrench on it, you have to do it from under the boat! Also, because there is no shaft extension, you can't just slip the pump assembly backwards enough to put the coupler wrench onto the coupler and unscrew from the shaft. The engine has to be unbolted and moved forward! A little bit of a PITA, but I had to work within the existing space I already had from when the 1000cc tigershark engine was in the boat, I didn't feel like having to re-build the entire pump tunnel to set it back.</p><p></p><p>On any future builds, though, I will allow an extra 6 inches so the driveshaft and pump is easier to remove!</p></blockquote><p></p>
[QUOTE="PSG-1, post: 330112, member: 6937"] I'm using an XL1200 pump, with the .700" diameter shaft (there were 2 sizes, if I remember correctly, I think the other one was .750") I think the rev limit on most direct drives is around 8K. Above that, I think the impeller would start to cavitate, and vibration caused by it at those speeds is probably more apt to cause damage. Just an educated guess, I may be wrong about that. My boat's a little funny about how you have to remove the pump, too. Since I cut the driveshaft and pump housing short to allow the FXHO to fit within the existing engine compartment, there is no shaft exposed above the pump housing, the engine coupler screws directly onto the threads. As a result, I had to cut wrench flats on the driveshaft, behind the bearing area, which means to put a wrench on it, you have to do it from under the boat! Also, because there is no shaft extension, you can't just slip the pump assembly backwards enough to put the coupler wrench onto the coupler and unscrew from the shaft. The engine has to be unbolted and moved forward! A little bit of a PITA, but I had to work within the existing space I already had from when the 1000cc tigershark engine was in the boat, I didn't feel like having to re-build the entire pump tunnel to set it back. On any future builds, though, I will allow an extra 6 inches so the driveshaft and pump is easier to remove! [/QUOTE]
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Alumacraft MV1448 Seadoo IB jet, Still jetting
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