Notices
The Boating Forum

6v 92ís @ 550 hp... how bad?

Old 11-09-2019, 08:35 AM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Nov 2008
Location: Seacoast NH
Posts: 6,673
Received 1,554 Likes on 725 Posts
Default 6v 92ís @ 550 hp... how bad?

Starting to look at a used convertibles. 80ís vintage, it seems every motor put in these things from this era has been labeled a time bomb. I found a Bertram I like a lot, but it has 6v92ís (550 hp). in there with 6600 hours. I have done some searches and most indicated this could be the worst of the worst.

A repower is not out of the question, just need to go in eyes wide open. Obviously price of the buy would have to be right. What is a modern repower option? Itís a 37 convertible. Iím thinking if I could keep the repower under $150k, it may make sense. Just wondering if I could get a season out of the 6v92ís to make sure I like the boat enough to make it pay off with smiles.
Old 11-09-2019, 08:45 AM
  #2  
Senior Member
 
Join Date: Jul 2012
Posts: 1,879
Received 192 Likes on 110 Posts
Default

Originally Posted by Boat Hound View Post
Starting to look at a used convertibles. 80ís vintage, it seems every motor put in these things from this era has been labeled a time bomb. I found a Bertram I like a lot, but it has 6v92ís (550 hp). in there with 6600 hours. I have done some searches and most indicated this could be the worst of the worst.

A repower is not out of the question, just need to go in eyes wide open. Obviously price of the buy would have to be right. What is a modern repower option? Itís a 37 convertible. Iím thinking if I could keep the repower under $150k, it may make sense. Just wondering if I could get a season out of the 6v92ís to make sure I like the boat enough to make it pay off with smiles.
id find a boat that doesn't need a repower. I have a lot of money in my boat that I'm currently repowering and I have to say I'm pretty much stuck with it either now since I had a good amount into it already.
Old 11-09-2019, 08:48 AM
  #3  
Senior Member
 
Join Date: Dec 2009
Posts: 517
Likes: 0
Received 60 Likes on 33 Posts
Default

I had 450's.....no problems but very temp sensitive. I costed re-power to 580 QSC Cummins with ZF transmissions at $110,000. without allowance for my trades.

A lot of 45 Hatts were powered with the higher hp Detroits and they were and remain a very popular boat.

6600 hours? Doesn't THAT tell you what you need to know?
Old 11-09-2019, 08:52 AM
  #4  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2013
Posts: 4,950
Received 631 Likes on 443 Posts
Default

That's a lot of hours....... plan on a repower.
Old 11-09-2019, 08:56 AM
  #5  
Senior Member
 
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 8,926
Received 1,715 Likes on 1,099 Posts
Default

That B37 should be pretty easy to push for a pair of 692. That's probably why they are still alive with those hours. 92's suffer when they are high hp AND have to push a really heavy boat. Run them at a modest power setting and they can live. Good chance they have had cylinder kit replacements at least once in their lives, any record of that?

I've been around a few B37's with 692 and most (if I remember right) were not the 550's, but somewhere in the 400's. Are you sure they are 550's?
Old 11-09-2019, 08:58 AM
  #6  
Admirals Club Admiral's Club Member
 
fireisland1's Avatar
 
Join Date: Jun 2011
Posts: 5,856
Received 3,168 Likes on 1,389 Posts
Default

Originally Posted by Fortu View Post
I had 450's.....no problems but very temp sensitive. I costed re-power to 580 QSC Cummins with ZF transmissions at $110,000. without allowance for my trades.

A lot of 45 Hatts were powered with the higher hp Detroits and they were and remain a very popular boat.

6600 hours? Doesn't THAT tell you what you need to know?
you did a full repower with new qscís for $110.00 ? Thatís really cheap. Who did it?
Old 11-09-2019, 09:19 AM
  #7  
Senior MemberCaptains Club Member
 
Join Date: Nov 2001
Location: Bluffton,SC/San Jose,CR
Posts: 1,904
Received 359 Likes on 174 Posts
Default

Originally Posted by fireisland1 View Post


you did a full repower with new qscís for $110.00 ? Thatís really cheap. Who did it?
x2......maybe if they were the reman program, but either way the power purchase is only half the battle....
Old 11-09-2019, 10:34 AM
  #8  
Admirals Club Admiral's Club Member
 
Join Date: Aug 2010
Location: Palm city florida
Posts: 257
Received 13 Likes on 11 Posts
Default

Originally Posted by Corndog38 View Post
That B37 should be pretty easy to push for a pair of 692. That's probably why they are still alive with those hours. 92's suffer when they are high hp AND have to push a really heavy boat. Run them at a modest power setting and they can live. Good chance they have had cylinder kit replacements at least once in their lives, any record of that?

I've been around a few B37's with 692 and most (if I remember right) were not the 550's, but somewhere in the 400's. Are you sure they are 550's?
You might be thinking of the 6V53's @400 hp.

Old 11-09-2019, 10:37 AM
  #9  
Admirals Club Admiral's Club Member
 
Join Date: Aug 2010
Location: Palm city florida
Posts: 257
Received 13 Likes on 11 Posts
Default

Originally Posted by Boat Hound View Post
Starting to look at a used convertibles. 80ís vintage, it seems every motor put in these things from this era has been labeled a time bomb. I found a Bertram I like a lot, but it has 6v92ís (550 hp). in there with 6600 hours. I have done some searches and most indicated this could be the worst of the worst.

A repower is not out of the question, just need to go in eyes wide open. Obviously price of the buy would have to be right. What is a modern repower option? Itís a 37 convertible. Iím thinking if I could keep the repower under $150k, it may make sense. Just wondering if I could get a season out of the 6v92ís to make sure I like the boat enough to make it pay off with smiles.
Why not just inframe them and go for another 6000+ hours?
Likes:
Old 11-09-2019, 10:43 AM
  #10  
Senior Member
 
Join Date: Jan 2005
Location: Corpus Christi, Texas
Posts: 194
Received 6 Likes on 6 Posts
Default

Are you sure that its not 6,600 total hours on the engines/hull? May want to confirm with the broker/seller that the engines haven't been rebuilt at some point in their life.
Likes:
Old 11-09-2019, 11:12 AM
  #11  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Nov 2008
Location: Seacoast NH
Posts: 6,673
Received 1,554 Likes on 725 Posts
Default

Originally Posted by Corndog38 View Post
That B37 should be pretty easy to push for a pair of 692. That's probably why they are still alive with those hours. 92's suffer when they are high hp AND have to push a really heavy boat. Run them at a modest power setting and they can live. Good chance they have had cylinder kit replacements at least once in their lives, any record of that?

I've been around a few B37's with 692 and most (if I remember right) were not the 550's, but somewhere in the 400's. Are you sure they are 550's?
550 is what Iím being told.
Old 11-09-2019, 11:14 AM
  #12  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Nov 2008
Location: Seacoast NH
Posts: 6,673
Received 1,554 Likes on 725 Posts
Default

Originally Posted by BLACKFIN 24 cc View Post
Why not just inframe them and go for another 6000+ hours?
In frame? Not familiar with the lingo? Just rebuild I assume? Any idea of cost on that ?
Old 11-09-2019, 12:04 PM
  #13  
Senior Member
 
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 8,926
Received 1,715 Likes on 1,099 Posts
Default

Originally Posted by BLACKFIN 24 cc View Post
You might be thinking of the 6V53's @400 hp.
No. Lots of boats had marine 692 in the 400's. Good engines at those ratings. That 653 at 400 was a miserable beast.
Old 11-09-2019, 12:16 PM
  #14  
Senior Member
 
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 8,926
Received 1,715 Likes on 1,099 Posts
Default

Originally Posted by Boat Hound View Post

In frame? Not familiar with the lingo? Just rebuild I assume? Any idea of cost on that ?
"In frame" is truck lingo for in frame overhaul, which means the engine block and crankshaft stay in the engine, and the engine stays in the frame of the truck. In marine, it means the block is stripped in the boat, but stays there. Not everything is replaced in an "in frame", but the things that typically wear are. Valves are done, cylinder kits, bearings, blowers, turbos. Cams and front and rear seals usually not done.

A 692 when it needs an overhaul it is usually just the cylinder kits that go weak. The rest of the engine is quite robust and can go a few cycles.

Cylinder kit replacement is usually about $2-3k per hole, but that varies quite a bit. Some shops won't warranty unless the replace all kinds of extra stuff. Some local techs will just do the kits and put everything else back on.
Old 11-09-2019, 12:21 PM
  #15  
Senior MemberCaptains Club Member
 
Join Date: Mar 2005
Location: Falmouth, MA
Posts: 1,156
Received 35 Likes on 26 Posts
Default

Try not to run them over 2000 rpm. We usually run ours between 1800 and 1950. A good Detroit tech can rebuild them at a very reasonable cost . Look into an in frame overhaul versus a replacement. We’re pleased with the performance of our 692’s, Ours are reasonably efficient as well - 692/435 hp in a 42’ Bert. . Also parts aren’t that expensive.
I’d look into an overhaul before a repower as mentioned above.
Old 11-09-2019, 12:27 PM
  #16  
Admirals Club Admiral's Club Member
 
fireisland1's Avatar
 
Join Date: Jun 2011
Posts: 5,856
Received 3,168 Likes on 1,389 Posts
Default

I’m not seeing a $100k repower. More closer to @$200 by the time it’s splashes
Likes:
Old 11-09-2019, 12:30 PM
  #17  
Senior Member
 
Join Date: Aug 2010
Location: Panama City, Fl
Posts: 104
Likes: 0
Received 12 Likes on 11 Posts
Default

I would guess that those engines have already been rebuilt at least once being turbocharged yacht engines. My old 6-71s were done at about 3000 hrs.
Old 11-09-2019, 01:55 PM
  #18  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Nov 2008
Location: Seacoast NH
Posts: 6,673
Received 1,554 Likes on 725 Posts
Default

Good feedback. Much appreciated. So $36k-? Figuring $3k/hole. Assuming cooling and maybe turbos too may need to be done? I know itís hard to say, but Iím ignorant here but smart enough to know what I donít know. Just looking to gain experience from others.
Old 11-09-2019, 02:14 PM
  #19  
Admirals Club Admiral's Club Member
 
Join Date: Jul 2011
Location: NJ
Posts: 869
Received 173 Likes on 99 Posts
Default

Originally Posted by fireisland1 View Post
Iím not seeing a $100k repower. More closer to @$200 by the time itís splashes
Correct, def cheaper to rebuild ...just depends what the OP is looking for
Old 11-09-2019, 07:15 PM
  #20  
Senior Member
 
Join Date: May 2008
Posts: 1,316
Received 106 Likes on 63 Posts
Default

If you can get a complete QSC/ZF repower for $110k, I'll take one too. I think you will be closer to $200k when it's all said and done.

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.