what to do to keep Bravo 1 alive at 525hp?
 

I opted for the lower cost Bravo 1 drive instead of the Bravo XR with the 496HO thinking that I would get ~75mph (because that was what I was told by the dealer) and that is all I wanted. Now I find out that the speedo says 75 but the gps says 68 at 5000rpm and 26 pitch Bravo 1 prop.

According to Mercruiser 425hp is it for the Bravo 1 and then comes the Bravo XR up to 575hp. I am considering an upgrade to about 500 to 525hp to get where I want to be. It will not be a supercharger but heads, cam and the like.

Replacing a brand new Bravo 1 with a Bravo XR is not something I even want to think about. I have heard comments that increased hp from engine mods is less abusive to the drive than a supercharger at lower and mid range rpms. This is supposedly due to the lower torque at lower rpms with the engine mods versus the supercharger.

I have also heard that using WOT during planeout is the primary cause of Bravo 1 drive failure (the forward gear set)when hooked up to higher than Mercury approved hp/torgue engines.

Given my hp target I am hoping to squeek by with the Bravo 1. I would appreciate hearing about experiences with the Bravo 1 and >425hp engines. Both successes and failures so I can judge my next move.

Thanks!

Re: what to do to keep Bravo 1 alive at 525hp?
 

As long as you don't WOT on take off you'll be alright. If you are going to be getting "air" alot you might want to upgrade to the thicker floor gears if there not already in it.

Re: what to do to keep Bravo 1 alive at 525hp?
 

My 28 Pantera (5200# dry) has a 525SC. The upper on the stock Bravo let go at 210hrs. The lower was fine. I replaced the upper with an Imco Exteme Advantage--still uses standard Bravo gears. I now have 550+hp and 210 hrs on the current drive without any issues and never any flakes of metal in the lube.

The key is change lube every 25-30hrs and run a drive shower. Don't hammer it outta hole and watch the air time.

Also, 500hps came with Bravo1 drives for many years before the XR was developed.

Re: what to do to keep Bravo 1 alive at 525hp?
 

I'm not an expert but with a light boat like that I can't imagine a concern......

I'm pushing a 10000 LB straight hull Tiger with 600+HPs with Bravos. Currently rebuilding and expect to have enough horse to not chance it anymore, but I just can't imagine a problem for you. Hopefully some more educated opinions will chime in....

Good luck,

Neil

Re: what to do to keep Bravo 1 alive at 525hp?
 

Thin out the blades and prop it to the high side of your rpm peak.

Re: what to do to keep Bravo 1 alive at 525hp?
 

Hey guys great info all! This is what I need to know.

KEYNNO
As long as you don't WOT on take off you'll be alright. If you are going to be getting "air" alot you might want to upgrade to the thicker floor gears if there not already in it.

What / where are the 'thicker floor gears' in the drive line and how would I know if I have them or not? My Bravo 1 is out of the box stock. Are these included in Bravo 1's after a certain build date?

GRIFF

My 28 Pantera (5200# dry) has a 525SC. The upper on the stock Bravo let go at 210hrs. The lower was fine. I replaced the upper with an Imco Exteme Advantage--still uses standard Bravo gears. I now have 550+hp and 210 hrs on the current drive without any issues and never any flakes of metal in the lube.

What is the 'IMCO Extreme Advantage'? A gear set, a reinforced housing support, ujoint, intermediate drive shaft, other? Where there any flakes of metal in the lube to predict the upper failure?

The Rage is very light and unfortunately for the drive likes to catch a lot of air at speed. I had not considered that issue until you brought it up.

Does everyone run Mercury Extreme Pressure Gear lube in the lower unit or has anyone found success with a full synthetic?

Thanks again for all the advice!

Re: what to do to keep Bravo 1 alive at 525hp?
 

More than anything this will help it last,Smitty

Re: what to do to keep Bravo 1 alive at 525hp?
 

«some more educated opinions » YOU SAID! :drink:

Re: what to do to keep Bravo 1 alive at 525hp?
 

Use Redline Shockproof Heavy gear lube. I have 650+ hp engines in a 11,500 lb boat (dry) and only one minor malfunction in three years (broken thrust washer). Gears still look like new.

Re: what to do to keep Bravo 1 alive at 525hp?
 

Exactly my situation this summer.... Couldn't believe it, the gears looked new. Makes a dandy paperweight or candle holder. :eek: :D