my bravo outdrive gear experiment
#111
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Originally Posted by rmbuilder
Smitty,
Did any of the treated components fail or was it collateral pieces? I have additional info on the short run gear-sets we spoke of.
Bob
Did any of the treated components fail or was it collateral pieces? I have additional info on the short run gear-sets we spoke of.
Bob
#112
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Originally Posted by articfriends
Borrowed a 28 pitch 5blade maximus this week from a fellow oso'er,tried it fri night back to back on the river against my 30 pitch labbed w/ext box w/1" spacer. Incredible cruise but slower on top end by 1 mph and lagged accelerating above 5000rpm's,also tq steered to port even wide open which boat has never done. Drained oil from lower yesterday,no metal from lower gears yet since newest treatment (cryo/isorem) even after some very long passes at hardy pond last week plus the testing fri and a couple of weekends of boating too. Pulled lower from upper,removed spacer and studs this morning putting lower back up to 1" raised position to try with 28 5 blade before returning it. Took boat out today,pulled fairly well with 5 blade even with heavy load in boat except still takes 10-20 seconds to go from 5000 to 5700. I made a half dozen high speed passes ,was heading in and leaned on it one more time,brought it up to 5000 fairly easy,started leaning on it with throttle to the wood and sheared something off in the drive
. I have put 5 or 6 sets of gears in lower after they started breaking thru the hardness but haven't blown up or sheared any gears or shafts in the past 3 seasons. Either something was fatiguing or the 5 blade just pushed something past its limit,we'll see in the next few days,I think a 5 blade is just too hard on my drive with the kind of torque I'm making,Smitty
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What were the slip numbers like? You can almost always raise the drive 1" or more and have better numbers with the Maximus's diameter. Also how about WOT speed with the spacer out?
Dave
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Originally Posted by zt260
A stock 30"bravo is really about 29" I realize it’s labbed, but it’s good you could turn the 28" Maximus. What RPMs do you normally turn with the bravo?
What were the slip numbers like? You can almost always raise the drive 1" or more and have better numbers with the Maximus's diameter. Also how about WOT speed with the spacer out?
Dave
What were the slip numbers like? You can almost always raise the drive 1" or more and have better numbers with the Maximus's diameter. Also how about WOT speed with the spacer out?
Dave
#115
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Originally Posted by zt260
Is 5700rpm the max you normally run? Seems like you need to go up further with the drive.
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Are you sure your motor is putting out the power? After your blown supercharger, Could you be down 1 pound of boost? That would equate to about 40HP and account for the 2-3 MPH loss of speed. The box is good and your slip numbers look great. If you take out the spacer it will lighten the load on your drive with the 5 blade.
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Originally Posted by cobra marty
Are you sure your motor is putting out the power? After your blown supercharger, Could you be down 1 pound of boost? That would equate to about 40HP and account for the 2-3 MPH loss of speed. The box is good and your slip numbers look great. If you take out the spacer it will lighten the load on your drive with the 5 blade.
#119
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Originally Posted by Pantera28-650HP
I see a Konrad in your furture . . . ![Big Grin](/forums/images/smilies/biggrin.gif)
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#120
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You tried very well , but you need a drive with bigger internals due to plastic deformation of metal and so forth.
You are asking a boy to do a man's job with the bravo...
KONRAD will be a great investment, and you would have spent less for it in both time and money, and experience less heartache......and more fun boating !!!
Maybe the Konrad uses a slight bit more power due to friction loss, but staying together is worth way more than 2 MPH and blown up drives that are now worthless...
Not to be a pain in the a$$ but my friend and I were the first on Long Island to run the Konrads and believe they are the best drive for the money, etc... And that was 2 seasons ago.. BBB
You are asking a boy to do a man's job with the bravo...
KONRAD will be a great investment, and you would have spent less for it in both time and money, and experience less heartache......and more fun boating !!!
Maybe the Konrad uses a slight bit more power due to friction loss, but staying together is worth way more than 2 MPH and blown up drives that are now worthless...
Not to be a pain in the a$$ but my friend and I were the first on Long Island to run the Konrads and believe they are the best drive for the money, etc... And that was 2 seasons ago.. BBB