View Poll Results: Bravo XR drive breakage
Broke upper gear set
71
82.56%
Broke lower gear set
15
17.44%
Voters: 86. You may not vote on this poll
Bravo XR drive breakage
12-21-2012, 08:01 AM
#33
VIP Member
How does the xr differ from the bravo 1? I am building a new 600hp motor for my 280 velocity that has a b1 and have heard of guys running 700 hp with stock b1 with out to many problems. Is it due to the 280 being a light boat? I'm still new to this, but was under the impression the xr drive was an upgrade to the b1.
In my industry we have transmission failers when using stock gears behind the high hp bike motors we build. Years ago we started cryoing gear seats and found that to extend the amount of power the gears would hold by about 10-15%. Still in need of stronger gear sets we started having complete billet gear and output shafts made up. The billet seems to be about 50-55% stronger than factory gears. Are there no options like this for boats? Or has it been tried and doesn't work.
For the bolts stretching problem. Why not have arp make up a set of bolts. I'm sure they can make a stronger option. I have an account with them if someone were interested in experimenting with having a bolt made.
In my industry we have transmission failers when using stock gears behind the high hp bike motors we build. Years ago we started cryoing gear seats and found that to extend the amount of power the gears would hold by about 10-15%. Still in need of stronger gear sets we started having complete billet gear and output shafts made up. The billet seems to be about 50-55% stronger than factory gears. Are there no options like this for boats? Or has it been tried and doesn't work.
For the bolts stretching problem. Why not have arp make up a set of bolts. I'm sure they can make a stronger option. I have an account with them if someone were interested in experimenting with having a bolt made.
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Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
Last edited by glassdave; 12-21-2012 at 08:04 AM.
12-21-2012, 08:13 AM
#34
Cryo treating helps extend the life of the gear to gear contact surfaces, but due to the design of the gear, it will fail eventually if too much torque is applied.
Also I don't feel the top caps lifting up has anything to due with the studs themselves. They thread into an aluminum case and will stretch or pull out the threads. I had one pull out. I heli-coiled all 4 and no issues loosening so far after 100 hrs.
Also I don't feel the top caps lifting up has anything to due with the studs themselves. They thread into an aluminum case and will stretch or pull out the threads. I had one pull out. I heli-coiled all 4 and no issues loosening so far after 100 hrs.
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Last edited by Smitty; 12-21-2012 at 08:17 AM.
12-21-2012, 08:18 AM
#35
Gold Member
Gold Member
Cryo treating helps extend the life of the gear to gear contact surfaces, but due to the design of the gear, it will fail eventually if too much torque is applied.
Also I don't feel the top caps lifting up has anything to due with the studs themselves. They thread into an aluminum case and will stretch or pull out the threads. I had one pull out. I heli-coiled all 4 and no issues loosening so far after 100 hrs.
Also I don't feel the top caps lifting up has anything to due with the studs themselves. They thread into an aluminum case and will stretch or pull out the threads. I had one pull out. I heli-coiled all 4 and no issues loosening so far after 100 hrs.
When will your solution be available? Straight cut or spiral cut gears? Whats the target price?
12-21-2012, 08:21 AM
#36
I'm going to say something that will probably be torched..but nonetheless...I have always wondered why if you were going beyond 600hp wouldn't you convert to a VI...It seems like that is the next level since SSMIII are gone along with trs drives? I know the cost is prohibitive to a point..but once you've trashed 3-4 drives..wouldn't have been better to go with the VI when you put extra power to the boat...just curious why more people don't make the switch to the 6 drive from the start?
12-21-2012, 08:24 AM
#37
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might be useful info if you guys stated the hp in front of the broken xr...i have only 10 hours in front of 600hp...so far,so good
Last edited by pqjack; 12-21-2012 at 08:44 AM.
12-21-2012, 10:40 AM
#40
Keith
I am hoping for a release date of 6-1-2013
Don't have pricing yet, but it will be more than stock XR gears. Unfortunately my small volume compared to Merc drives up the cost.
They will be direct replacements for XR gears.
Can't talk about anything else right now.........
I am hoping for a release date of 6-1-2013
Don't have pricing yet, but it will be more than stock XR gears. Unfortunately my small volume compared to Merc drives up the cost.
They will be direct replacements for XR gears.
Can't talk about anything else right now.........
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