View Poll Results: Should I go..
Supercharger
31
50.82%
Turbocharger
13
21.31%
Big Inch NA
17
27.87%
Voters: 61. You may not vote on this poll

Like Tree0Likes

Supercharge or Turbocharge

Reply
Old 02-05-2004, 06:36 PM
  #41
Registered
 
KH0302's Avatar
 
Join Date: Dec 2003
Location: Lake Lanier
My Boats: 87 22 Pachanga
Posts: 648
Default

That explained a lot, Reed. I'm freshwater, didnt know you were salt.

Another point is twin vs.single turbine set up. 2 smaller turbines vs. 1 honker footwide Banks, twins are better. The little wheels spool so much faster and make the same boost. Just, way more bucks for the exhaust fabrication and dual inlets on the intercooler.
KH0302 is offline  
Reply With Quote
Old 02-05-2004, 06:42 PM
  #42
Registered
 
KH0302's Avatar
 
Join Date: Dec 2003
Location: Lake Lanier
My Boats: 87 22 Pachanga
Posts: 648
Default

robyw1, when you speak of watercooled intercooler, where would you get the freshwater(separate pump?), and couldn't you T off of that for cooling the turbo?
KH0302 is offline  
Reply With Quote
Old 02-05-2004, 06:49 PM
  #43
Registered
 
Reed Jensen's Avatar
 
Join Date: Dec 2003
Location: Los Angeles California
Posts: 8,301
Default

Quote:
Originally posted by KH0302
robyw1, when you speak of watercooled intercooler, where would you get the freshwater(separate pump?), and couldn't you T off of that for cooling the turbo?
Most boats that have intercoolers... whether for a turbo or rootes type supercharger get their water from a separate through hull pick-up... just the forward motion of the boat will push the water through the pick-up and through the intercooler.NO pump... just a sea strainer to filter out the debris.
Reed Jensen is offline  
Reply With Quote
Old 02-05-2004, 06:58 PM
  #44
Registered
 
KH0302's Avatar
 
Join Date: Dec 2003
Location: Lake Lanier
My Boats: 87 22 Pachanga
Posts: 648
Default

"just the forward motion of the boat will push the water through the pick-up and through the intercooler.NO pump... "

Well...that sounds to me, slow running or idling around...you'll heatsoak the whole boat.
KH0302 is offline  
Reply With Quote
Old 02-05-2004, 07:03 PM
  #45
Registered
 
Reed Jensen's Avatar
 
Join Date: Dec 2003
Location: Los Angeles California
Posts: 8,301
Default

Quote:
Originally posted by KH0302
"just the forward motion of the boat will push the water through the pick-up and through the intercooler.NO pump... "

Well...that sounds to me, slow running or idling around...you'll heatsoak the whole boat.
Only the intercooler is plumbed that way... it is a seperate system... not connected with the cooling system for the engine.. you really only need to cool the charge when you are boosting the intake charge... as soon as the boat gets on plane.. there is plenty of flow to the intercooler.
Reed Jensen is offline  
Reply With Quote
Old 02-05-2004, 07:18 PM
  #46
Registered
 
KH0302's Avatar
 
Join Date: Dec 2003
Location: Lake Lanier
My Boats: 87 22 Pachanga
Posts: 648
Default

Quote:
Originally posted by Reed Jensen
Only the intercooler is plumbed that way... it is a seperate system... not connected with the cooling system for the engine.. you really only need to cool the charge when you are boosting the intake charge... as soon as the boat gets on plane.. there is plenty of flow to the intercooler.
I think if I was going to do it I'd run that pickup thru a belt driven pump and pick off it to cool my turbine too.

If my boat was longer I'd be thinking foolish thoughts. Well, I already am.

KH0302 is offline  
Reply With Quote
Old 02-05-2004, 07:28 PM
  #47
Registered
 
Reed Jensen's Avatar
 
Join Date: Dec 2003
Location: Los Angeles California
Posts: 8,301
Default

KHO.... at speed.... the pump would impede the flow of the water... generally the turbo is cooled last along with the exhaust after the water has circulated through the block and heads, then it dumps out the stern. We are talking about the same thing... aren't we? Raw water cooling ? Gas engines.... stern drive boats? Only the intercooler is plumbed separately. No reason to have two raw water pumps. You are welcome to plumb it any way you want.... I generally try to keep things simple...
Reed Jensen is offline  
Reply With Quote
Old 02-05-2004, 09:54 PM
  #48
Registered
 
Join Date: Jun 2001
Location: Grand Rapids, MI
My Boats: 91 Eliminator 24' Cat
Posts: 80
Default

Dyno, I am busy building a drive to hold all that bottom end torque--1000ft/# at 2200. I am putting a Blackhawk lower on a Bmax upper, just about done. The Bmax upper never failed, but the mercury lower gears couldn't't handle the torque.
I figured that if I had two props that should divide the torque by two. I also remembered how fast the boat was with less HP. It looks great, I'll post some pictures next week.
Tom
Tom Earhart is offline  
Reply With Quote
Old 02-05-2004, 10:42 PM
  #49
Registered
 
Turbojack's Avatar
 
Join Date: Sep 2001
Location: Houston, TX, USA
My Boats: 2003 Eliminator 30' Daytona
Posts: 2,285
Default

Quote:
Originally posted by robyw1
I understand all of that but you threw me with the watercooled shrouds. I never heard of such thing.

Roby

I had those also. It is a water cooled jacket that fits around the outside of the turbo. That is what was used before they came out with the water cooled housing.
Turbojack is offline  
Reply With Quote
Old 02-06-2004, 10:28 AM
  #50
Platinum Member
Platinum Member
 
mcollinstn's Avatar
 
Join Date: Sep 2001
Location: tn
My Boats: 1991 F311SR1
Posts: 5,491
Default

Okay.

Turbos done properly are LOTS more expensive than a blower (from a mfg point of view). Bolt on a blower, rig the pulleys, change the timing and fuel curve, and you're done.

For a turbo, you have different exhaust manifolds, lots more plumbing, blowoff valves that have to be plumbed back into the loop for marine usage, and a setup that is intolerant of fools. Warranty claims? Can you say yikes?

Now, if you are making your own homebrew, it will still be expensive but you can get a great result.

Roby knows turbos, so that is a good start.

You gonna have to use a marine turbo - water cooled ball bearings and full cast water jacketed exhaust section. Big bucks unless you can work around the lag of a diesel unit (they typically have a lot of inertia). You WILL have to run an antifreeze mix thru the housing for best results, and that entails another heat exchanger. BOV and waste gate will both be necessary if you plan to run it in rough water where you need the response fro the sticks.

Can it be bad-ass? Definitely, butyou gotta properly deal with the heat and corrosion and inertia.

I'd advise finding a diesel boneyard and getting heat exchangers, aftercoolers, and water cooled turbos from them to experiment with. You'll want twin turbos cause with marine exhausts you can't get the turbine very far away from the ports or you lose all of your heat energy..

Have fun.
mcollinstn is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Ridin-Dirty
General Q & A
19
09-18-2008 06:30 PM
brian valery
Formula
6
08-01-2006 11:28 AM
GREEK LIGHTNING
General Boating Discussion
27
06-19-2004 03:36 PM
two-air
General Q & A
26
05-19-2002 12:17 PM
outlawinil
General Q & A
5
01-12-2002 05:22 PM



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 01:18 PM.


Copyright 2011 OffShoreOnly. All rights reserved.