Like Tree0Likes

A few stir-the-pot questions

Reply
Old 08-19-2010, 01:50 PM
  #1
Registered
Thread Starter
 
Join Date: May 2006
Location: Cape Cod
My Boats: Sutphen Ocean Pacer/Superboat 24/Excalibur 24
Posts: 419
Default A few stir-the-pot questions

Well, it looks like the motors will have to come out of that OP we bought. One of the oil pans is rotten and we'll probably take a good look around while we've got 'em out. With that in mind, a few questions for the collective:

1. Bravo conversions: Has anyone done one? I know what's involved. Obviously, you'd gain more space in the engine compartment and you'd lighten up the back of the boat a bit. You could also optimize the X-dimension, which would be nice. Are you going to gain much speed from this swap? TRS drives are more rugged than Bravos, which is a consideration.

2. I gather it takes about 500 hp per side to get an OP to 80? How about 85?

Last edited by dba900; 08-19-2010 at 01:51 PM. Reason: Grammar
dba900 is offline  
Reply With Quote
Old 08-19-2010, 02:22 PM
  #2
Registered
Trade Score: (1)
 
rchevelle71's Avatar
 
Join Date: Aug 2003
Location: Boca Raton
My Boats: 1982 Pantera 24sport
Posts: 7,392
Default

You may lighten up the back of the boat, but you will also change Center of Gravity.

Last edited by rchevelle71; 08-19-2010 at 04:46 PM.
rchevelle71 is offline  
Reply With Quote
Old 08-19-2010, 02:23 PM
  #3
Registered
Thread Starter
 
Join Date: May 2006
Location: Cape Cod
My Boats: Sutphen Ocean Pacer/Superboat 24/Excalibur 24
Posts: 419
Default

Hmm, good point. Too bad there aren't any cheap Arnesons floating around...
dba900 is offline  
Reply With Quote
Old 08-19-2010, 02:35 PM
  #4
Registered
Trade Score: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
My Boats: 22 Avanti, 25 Nova, 2 turtle doves and a partridge in a pear tree,SBYC
Posts: 8,651
Default

Quote:
Originally Posted by rchevelle71 View Post
You may lighten up the back of the boat, but you will also chenge Center of Gravity.
I have heard this a lot when talking about a TRS bravo swap, but my mind also thinks that while removing weight you are also shoving the heaviest peice, the motor back. had any one ever actually figured out the real difference?
phragle is offline  
Reply With Quote
Old 08-19-2010, 02:51 PM
  #5
Social Distortion
Gold Member
 
wstultz's Avatar
 
Join Date: Sep 2004
Location: Lake Conroe,Texas
My Boats: 33 Sutphen, 26 Sutphen, TOPPS Lake Conroe
Posts: 5,723
Default

You may check into extension boxes. I think Stelling makes an extension box with a TRS bolt pattern on the transom side and a bravo bolt pattern on the drive side. It would save some fiberglass work plus you could leave the engines where they are and run shafts or scoot them back since you are pushing the drives back. It may equal out your Cof G. Just a thought.
wstultz is offline  
Reply With Quote
Old 08-19-2010, 03:17 PM
  #6
Registered
Thread Starter
 
Join Date: May 2006
Location: Cape Cod
My Boats: Sutphen Ocean Pacer/Superboat 24/Excalibur 24
Posts: 419
Default

It sounds like it might not be worth the work to do all of this when the drives and transmissions work fine as-is. I suppose I could always call the factory. It might be simpler to just build/buy bigger power.
dba900 is offline  
Reply With Quote
Old 08-19-2010, 03:37 PM
  #7
Registered
Trade Score: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
My Boats: 22 Avanti, 25 Nova, 2 turtle doves and a partridge in a pear tree,SBYC
Posts: 8,651
Default

Quote:
Originally Posted by wstultz View Post
You may check into extension boxes. I think Stelling makes an extension box with a TRS bolt pattern on the transom side and a bravo bolt pattern on the drive side. It would save some fiberglass work plus you could leave the engines where they are and run shafts or scoot them back since you are pushing the drives back. It may equal out your Cof G. Just a thought.
Merc makes a plate that bolts on for a volvo to bravo conversion that can also be used for trs to bravo conversions, but I would still want to just redo the transom and have some flexibility on drive height.
phragle is offline  
Reply With Quote
Old 08-19-2010, 04:49 PM
  #8
Registered
 
OL40SVX's Avatar
 
Join Date: Jun 2003
Location: Bristol, RI
My Boats: Outerlimits
Posts: 7,220
Default

Go on to Boatfreaks and look for Sutphen 30. He runs Bravos on his and it runs well.
OL40SVX is offline  
Reply With Quote
Old 08-20-2010, 10:50 AM
  #9
Registered
Thread Starter
 
Join Date: May 2006
Location: Cape Cod
My Boats: Sutphen Ocean Pacer/Superboat 24/Excalibur 24
Posts: 419
Default

Would 550 hp be pushing it on a set of standard Bravos?
dba900 is offline  
Reply With Quote
Old 08-20-2010, 11:59 AM
  #10
Social Distortion
Gold Member
 
wstultz's Avatar
 
Join Date: Sep 2004
Location: Lake Conroe,Texas
My Boats: 33 Sutphen, 26 Sutphen, TOPPS Lake Conroe
Posts: 5,723
Default

Quote:
Originally Posted by dba900 View Post
Would 550 hp be pushing it on a set of standard Bravos?
I've seen Bravos take a lot more than that but it is all in how you treat it. If you plane like you're in an inboard ski boat, yes, you would destroy them quick.
wstultz is offline  
Reply With Quote
Reply



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 06:54 AM.


Copyright 2011 OffShoreOnly. All rights reserved.