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Topics - 78_Tahiti

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The No Wake Zone / Thank You!
« on: May 31, 2010, 12:24:49 PM »
Quote from: Cas
To all of our servicemen who have fought for the freedoms we have today.

Also, for the Families & Loved Ones of this Great Countries Service Men & Women, I want all of you to Know. You are always in our Prayers, and quite a Few of Us. HAVE YOUR BACK!!   ;D

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V-Drives / prop shaft strut alignment
« on: May 13, 2010, 01:43:35 AM »
a friend just boutght 90 ski centurian. only had it out a couple times. this last time out he said the boat feels as if the right (starboard) side feels like its riding a bit lower when on plane then the left, the right wake is taller and the spray from strakes. being a jet boat person myself, I'm not to sure what his issue is. he has not added any weight to that side of the boat, has seen no water draining out of, or in the bilge. the skaggs in the middle of the hull are straight. the prop shaft is not aligned with the rudder, but this may be design (so you can pull the shaft) any thought would be greatly appreciated. oh yeah, heres a pic of the shaft and rudder from the back.

3
Jet Pumps / Question about intake pressure/vaccum Vs Bowl Pressure
« on: March 23, 2010, 11:38:12 PM »
Has anybody or any group of jet boaters for that matter. Recorded intake pressures and relative bowl pressures. I was wondering if there was any insight to be gained by this. I realize it is probably a per hull/pump combo kind of thing. but it seems that there should be some knowlege or troubleshooting info from it. for instance you change nozzles from 3" to 3 1/4" wouldnt your intake pressure stay the same and your bowl pressure be less at the same RPM. Then what would the result be in terms of holeshot and top end? Im just trying to get a feel on what people out there have found. even though I dont have a high end pump. (mine's a Panther) Im always looking for little things for improvement. With my stock exit housing I have no cavitation and a great holeshot. My motor turns the pump 5400 to 5500 RPM at about 58 mph. When I swapped with the Panthervator one I have, Its like a slipping clutch. Theres no way I can floor it out of the hole, unless I wish to rev my motor passed 6200 RPM. with nothing else changed, other then the exit housing.
  So I tapped a couple 1/8" inch holes, one in the suction housing area, and one in both exit housings in the same place. The rear ones are just above a stator vane, as thats where the cooling system pick up is located as well (just above a different vane) I figure thats probably the highest, high pressure area. heres a couple pics.



After I go get a little data, maybe then I can figure out whats going on. anyones previous pressure findings would ne great to hear.

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