Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-04-2015, 05:12 AM   #1
Ensign
 
Join Date: Jun 2010
Posts: 14
Default changing ratio on my bravo2 out drive???

what would happen if i changed the ratio from 1.81 to 2.0 on my bravo two outdrive. i have a 454 Mercrusier engine 300 HP single screw. the current outdrive case is shot. lots of corrosion. any help would be great!

SCR 2700 Maxum 1993 has trim tabs

thanks, mike
__________________

mikembs is offline   Reply With Quote
Old 03-04-2015, 11:48 AM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

The performance of the boat will change; time to plane, WOT. You may be able to compensate by re-propping, BII props are not cheap though.
__________________

__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 03-04-2015, 05:40 PM   #3
Ensign
 
Join Date: Jun 2010
Posts: 14
Default

so the boat would be slower but better out of the hole?
mikembs is offline   Reply With Quote
Old 03-04-2015, 09:20 PM   #4
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

Yes the WOT will be lower and the bottom end performance a little better.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 12-03-2015, 07:52 PM   #5
Ensign
 
Join Date: Jun 2010
Posts: 14
Default

works better expected. i also put a "whale tail " on the out drive and it pops right up on plane and i get 5-7 mph better at WOT. not sure why but i will take it.
mikembs is offline   Reply With Quote
Old 12-03-2015, 09:53 PM   #6
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

Don't argue with success.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 12-07-2015, 01:39 PM   #7
Moderator

 
shrew's Avatar
 
Join Date: Apr 2008
Posts: 5,588
Default

Changing the gear ratio because the drive case is shot makes no sense. I agree that you would be better off ensuring you're properly propped.

drive foils like the whale's tale is giving you lift on the outdrive, which is transferring pressure to the transom assembly. The drive was not designed to have lift or plane the hull. There is a reason outdrive manufacturers have not redesigned their outdrive to include this lifting element from the factory.
__________________

shrew is offline   Reply With Quote
Reply

Tags
bravo2, outdrive, ratio

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 05:25 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.