Originally Posted by articfriends

Max machine worx gets my vote. I just broke a drive 1 week ago,lower gears started chipping teeth away,ruined most the bearings thru out drive,60 hours on drive since it was freshened-(30hours w/750hp-30 hours w/950 hp). The upper xr gears still looked good,no broken or twisted shafts this time. Drive breakage is going to happen at 800 plus hp if your running any kind of bravo derivative,its just getting it to last a reasonable amount of time. Is there a reason your running a 34/35 pitch prop at only 4900rpm's?If you torque load the drive hard down low like that it will break quicker.If your any where near Michigan mr gadgets can build you a good drive using max parts or any combination of parts you want. I was at hardy pond this weekend, both races I got in were against velocitys like yours,1 had a mph on me ,the other walked away,pretty fast hulls ,Smitty

Originally Posted by Panther

Hmmm, I'm turning a 32 Bravo 1 to 5000 rpm with a full load of fuel and 5300 with 1/4 - 1/2 tank of fuel.

I wonder if a 30" pitch would be better at 5300 full tank and 5600 1/2 tank?

The Valvetrain is set up to run 5200 - 5600, we spun them to 5800 on the dyno. I'd loose cruise speed but if the drive lasts longer than so be it.

Originally Posted by RBeyer

My 30 lab finished to 31 runs 6200 to 6400. My thought is that my next drive selection be a 1.36 and my 31 will be the prop of choice. The 32 buries the bow and I don't get the WOT speed I should be.

Originally Posted by Panther

Hmmm, I'm turning a 32 Bravo 1 to 5000 rpm with a full load of fuel and 5300 with 1/4 - 1/2 tank of fuel.

I wonder if a 30" pitch would be better at 5300 full tank and 5600 1/2 tank?

The Valvetrain is set up to run 5200 - 5600, we spun them to 5800 on the dyno. I'd loose cruise speed but if the drive lasts longer than so be it.

Originally Posted by articfriends

I'm of the opinion that when you "torque load" a drive it tortures the drive AND your motor.It sounds like we have very similar setups,my motor (procharged 540) made 944hp/880ft lbs tq at 5600,907hp/917ft lbs tq at 5200 and tq peaked on most dyno runs around 960 ft lbs at 4600. In my single engine baja 272 v w/std length outdrive i can pull a 30 pitch labbed merc prop to 5800-5900 rpm's,with a non-labbed 32 i lost a couple mph on top and pulled to 5200-5300 and boat acted evil,it wanted to bow steer,motor sounded like it was on a extended dyno pull. It cruised at same speed at 3500 that it normally does at 4000rpm's BUT i was showing 2-3 psi of boost to cruise at 4000rpm's where throttle isn't normally open far enough to show boost w/30 pitch at that rpm.If you lug your motor hard too far below hp peak then it increases your chances of detonation and strains your drive. I ran a 32 labbed this weekend,cruised nice on the midrange,took considerably longer to wind out above 5000 rpm's though but motor could pull it to 5600,I don't know where your hp and tq peaks are but you might want to try a 32 labbed also,Smitty

Originally Posted by mr_velocity

Billy has a spare set of non-labbed 30s sitting in his shop. Stop by and see him and give them a try. Just make sure you get a L & R since there are 3.

Originally Posted by Panther

I'm also of the opinion that the IMCO lower case causes the props to "bite" way to much while under way, making re-entry that much harder on the drive. Any thoughts?