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Superchargers and outdrives

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Superchargers and outdrives

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Old 01-18-2018, 07:00 PM
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I am planning on around the 6 grand mark also. 540 going in a Activator 27. Was planning on procharging but dont want to do the blow through carb thing so decided to go roots carbed.
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Old 01-18-2018, 07:10 PM
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Originally Posted by Single cat View Post
Very interesting reading
Not really, max torque is between 3-4000 rpms.
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Old 01-18-2018, 07:16 PM
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Originally Posted by endeavour32 View Post
Not really, max torque is between 3-4000 rpms.
maybe with you cams. Hah
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Old 01-18-2018, 07:18 PM
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Originally Posted by green lightning View Post
I have centrifugal superchargers and when I was breaking my bravos all my drive problems happened above 3,000 rpm and I was not jumping any waves
what kind of power
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Old 01-18-2018, 07:27 PM
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Originally Posted by getrdunn View Post
what kind of power
800 hp
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Old 01-18-2018, 07:43 PM
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Originally Posted by SecondWind View Post
I would vote a roots supercharger is harder on the drive all other variables being equal. My opinion is based on immediate boost at all rpms where a centrifugal supercharger has to spool up. I understand centrifugal is a more efficient supercharger but if you want results without waiting roots will instantly assault your drive train. Ask me how I know! This performance sure does get expensive
I'm guessing my Procharged engine will unfortunately be JUST as hard on drives...


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Old 01-18-2018, 08:33 PM
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I've been running 700 HP through a pair of bravos for about 500 hrs. The drives are original circa 1992. Over 1100 total hours on the drives, never opened up. I'm easy on and easy off and it I air it out it's not intentional. Don't get me wrong, I use every bit of power I have and I beat on it when someone makes me do so. It's all up to how you work the throttles.
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Old 01-18-2018, 08:35 PM
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Originally Posted by getrdunn View Post
maybe with you cams. Hah
Yeah I guess add 5-600 on to each of those numbers.
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Old 01-18-2018, 08:46 PM
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Originally Posted by payuppsucker View Post
I've been running 700 HP through a pair of bravos for about 500 hrs. The drives are original circa 1992. Over 1100 total hours on the drives, never opened up. I'm easy on and easy off and it I air it out it's not intentional. Don't get me wrong, I use every bit of power I have and I beat on it when someone makes me do so. It's all up to how you work the throttles.
Boat size and weight has a lot to do with it. I ran 650 hp through bravo X drives, in my 29 Formula. Never really an issue. Put that same combo in a 38 and itís going to be a lot harder on the drives. Thatís why I sold all my bravo stuff when I bought the new boat, and switched to SSMs. Thatís when I was planning on sticking with my old engines. No way those drives would last a day with the new power.

I did build a drve for a guy guy with a 25 Baja, 950 hp. It too had X gears In an IMCO case. It made it through his Poker Run, and thatís all he cared about. I was honestly shocked it stayed together. Thatís a lot of power for a Bravo.
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Old 01-18-2018, 10:57 PM
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Centrifugal chargers seem like they’d be easier on the drive because they make power higher up in the revs when the boat is up and loose, but they make so much power that they require huge props that struggle to get out of the hole loading the drive even more. I’ve heard stories of drives living forever in rough water but blowing them up in smooth water with the constant relentless tension.

Moral of of the story: you’ll have to pay to play once X amount of HP has been exceeded no matter how you achieved it.
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