What are you guys running for drive height on your BT's? Anyone know the approximate depth they are below the running surface directly in front of the drives? Any help would be greatly appreciated.
Thread: Drive height
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05-16-2016 07:42 PM
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05-16-2016 08:10 PMYes. I never got the boat dialed in last year - ended up blowing a motor @ less than 30 hours. Both motors reworked (again) and pushing even more lower now. I'm getting extremely high slip numbers running a 32P Bravo I prop. Just received new drive couplings to put the drives back to stock depth which looks to be close to 4" below the running surface.
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05-16-2016 08:32 PMYup that's it with the spacers installed. Removed now and IMCO SCX uppers installed.
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05-16-2016 08:35 PM
Ever tried 5 blades? Seen several 460's that like, not sure what 5 blades they were.
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05-16-2016 08:44 PMI haven't. I do think the boat needs bow lift though I can almost feel it plowing at speed. I'm wondering if the spacers were pushing the bow down?
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05-16-2016 08:47 PM
Spacing the drives down usually leverage the bow higher.
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05-16-2016 08:54 PM
My 02 46 with KE675s or as dyno proven 699s ran BMAX drives with standard XR lowers with Hydro P5X props. Boat handled good, carried the nose and was enjoyable with minimal tab. Same boat with 4 blades became an absolute turkey. Try no spacers and P5X props.
Btw, my first 43 had -2 lowers and when I put standards on it it slowed and completely changed for the worse its handling. John P with No-Comp (trip 850) 46 saw gains after we discussed -2 vs std lowers.
Short drives/more prop... Have fun
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05-16-2016 08:56 PMHmmm....not sure what I've got going on then. I was thinking that having the drives that deep was increasing my slip numbers. I'm running close to 30% slip @ WOT.
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05-16-2016 09:01 PMNew motors dynoed at 890 hp. Boat seems to hit a wall @ 74 mph. How is it getting on plane with -2? I seems to really blow out the 32P props WITH the spacers installed - can't imagine what it'd be like with 4" less in the water
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05-16-2016 09:01 PM
Are you running the props that came on the boat, or do you know the history on the props before you got them? Or has anyone worked on them?
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05-16-2016 09:03 PMWhen I look at the tab locations on your photo I'm confused. Are they mounted within a half inch of the bottom? And is the port lower than the starboard, or is that a visual mirage?
Getting bad advice is unfortunate, taking bad advice is a Serious matter!!
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05-16-2016 09:07 PM
4 blades on my 46 blew out, my current 43 did too until b blades worked them. 5 blades on my 46 hooked up and rolled on plane no issues.
If I had 890hp and hit 74 I'd be crying. I hit that Friday night late under the community bridge @ Loto with my catastrophe of power I call engines...fWIW, when my engines were procharged they were odd to understand the power and along with finicky. 775hp per dyno.
Call me if I can be of any help to discuss my setups.
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05-16-2016 09:08 PMAlso, with your spacers installed, I have to believe the cavitation plate was running in the water even at WOT. They were just too low.
Typically the water starts to rise to its normal level as soon as it leaves the transom. Your cavitation plates appear to be lower than the bottom of the boat in the photo. I think they were displacing water and aerating the water to the prop also.Getting bad advice is unfortunate, taking bad advice is a Serious matter!!
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05-16-2016 09:26 PM
My 43 with PC'd motors ran 32 b1 props as info.
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05-16-2016 09:36 PM
Saxman... Why are these boats turkeys to dial in?