Like Tree0Likes

575 sci power upgrades ?

Reply
Old 08-09-2010, 09:37 AM
  #11
Forum Regulator
VIP Member
Trade Score: (1)
 
Sydwayz's Avatar
 
Join Date: May 2001
Location: Worldwide
My Boats: 17' Speedliner Cat & O.P.B.
Posts: 21,922
Default

Dean Gellner in Ohio is probably one of the foremost experts on squeezing power out of the 575 sci.
Sydwayz is offline  
Reply With Quote
Old 08-09-2010, 11:53 AM
  #12
Registered
 
Back4More's Avatar
 
Join Date: Feb 2002
Location: Lake Michigan
My Boats: 353 Fastech
Posts: 6,624
Default

I would start by swap out the 256 Blower for an 8-71 @ 8psi. also maybe add a healthy roller cam to help out.

Last edited by Back4More; 08-09-2010 at 11:59 AM.
Back4More is offline  
Reply With Quote
Old 08-09-2010, 05:26 PM
  #13
Platinum Member
Platinum Member
Trade Score: (1)
 
JRider's Avatar
 
Join Date: Jul 2007
Location: MI
My Boats: DCB
Posts: 2,507
Default

The question is: how much do you want to spend? If the boat has 200hrs on it you should change the head gaskets and rebuild the blower. You can only guess how I know. If you do the head gaskets with the motor out of the boat it would be a good time to do a cam change. Even if you dont have 200hrs on the boat, if you turn the boost up the stock head gaskets in that motor are a chance I wouldnt take. If the head gaskets have been replaced and you dont want to pull the motor apart, an intercooler, pulley and fuel adjustable fuel pressure regulator is a good place to start. That is basically teagues kit. If you are limited on hatch space the whipple cooler might fit but it is spendy. The superchiller is priced right but tall and you will get into adding scoops and losing you sun pad. Also modifying your covers. As mentioned earlier, you can upgrade to an 8:71 (which is an 1.5" taller) and pedal your 256 for some good cash...I found a good lightly used 8:71 with a low pro whipple cooler for about $3300 complete with carbs and linkages.
JRider is offline  
Reply With Quote
Old 08-09-2010, 06:23 PM
  #14
Registered
 
Join Date: Jul 2007
Posts: 6
Default x2 on Dean Gellner

I also support the vote for Dean Gellner...

He did heads, custom rollercam, whipple low-pro intercooler, smaller pulley and custom tuning to hit 775hp on my 575SCi's and the best part is they idle like stock and pull like a rocket all the way to 5600.

Just my two cents.
seba3237 is offline  
Reply With Quote
Old 08-09-2010, 07:03 PM
  #15
Registered
 
Join Date: May 2006
Location: Iowa
My Boats: 2002 Top Gun TS
Posts: 5
Default

Recently, when I start my port engine 575sci, the engine idles at around 2200 to 2500 rpm versus the starboard engine idling at roughly 1100 rpm.

After a few minutes the port engine idle slows down to match the starboard engine at 1100 rpm.

Is this a concern? What may be causing this and what to fix?
cephus is offline  
Reply With Quote
Old 08-10-2010, 02:07 AM
  #16
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,754
Default

They idle at 1100rpms????? They should idle at about 750rpms.
Griff 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 09:56 AM.


Copyright 2011 OffShoreOnly. All rights reserved.