Like Tree0Likes

New Engines: 557 or 572

Reply
Old 10-18-2006, 06:53 PM
  #81
Registered
Thread Starter
 
44MTI's Avatar
 
Join Date: May 2003
Location: E-Dock
My Boats: 08' 44 MTI
Posts: 3,128
Default Re: New Engines: 557 or 572

These motors will definately have whipples on them. I am just not sure that I would want to turn more than 6200-6500 rpm's. So I'm wondering if I should go ahead and build the 4 1/2 stroke and take the extra torque. I ASSUME, I know I shouldn't, that if I go with the 4 3/8 stroke I will give up a little torque ( at the same rpm) but be able to safely turn more rpm's if needed. Assuming this is true, any idea how much the difference would be in torque. and would it even br noticeable in the boat.
Thanks
Michael
44MTI is offline  
Reply With Quote
Old 10-18-2006, 06:54 PM
  #82
Registered
Platinum Member
 
Comanche3Six's Avatar
 
Join Date: Sep 2003
Posts: 9,273
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by mrhorsepower1
That depends on how long of a rod length you choose.
What length do you recommend?
Comanche3Six is offline  
Reply With Quote
Old 10-18-2006, 07:06 PM
  #83
Geronimo36
Gold Member
 
Panther's Avatar
 
Join Date: Sep 2002
Location: Elkton, MD
My Boats: 36' Apache Warrior / 22' Apache Scout
Posts: 11,838
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by mrhorsepower1
That depends on how long of a rod length you choose.
I have a 6.70 rod and although there may be some advantages/disadvantages mechanically...I didn't like waiting the 8 wks for custom dished pistons. I ordered 4 spares just in case..I hope I never need them though...

We could have cheated and got a flat top with a thicker head gasket or had a dish milled into the piston but I wasn't a big fan of either choice and told my "old" builder not to do it....
Panther is offline  
Reply With Quote
Old 10-18-2006, 07:38 PM
  #84
Banned
 
Join Date: Feb 2005
Location: Cleveland, Ohio
My Boats: all
Posts: 1,460
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by Comanche3Six
What length do you recommend?
I like the 6.635 rod. It allows the ring land stack and crown thickness of the piston to be engineered better.
mrhorsepower1 is offline  
Reply With Quote
Old 10-18-2006, 08:51 PM
  #85
Registered
 
JCPERF's Avatar
 
Join Date: Jul 2004
Location: Long Island,New York
My Boats: 10 foot Kayak
Posts: 8,908
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by mrhorsepower1
I like the 6.635 rod. It allows the ring land stack and crown thickness of the piston to be engineered better.
And according to Smokey, all the rod does is connect the piston to the crank.
JCPERF is offline  
Reply With Quote
Old 10-18-2006, 08:59 PM
  #86
Banned
 
Join Date: Feb 2005
Location: Cleveland, Ohio
My Boats: all
Posts: 1,460
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by JCPERF
And according to Smokey, all the rod does is connect the piston to the crank.
mrhorsepower1 is offline  
Reply With Quote
Old 10-18-2006, 09:02 PM
  #87
Registered
 
WeaponX's Avatar
 
Join Date: Feb 2005
Location: LOTO
My Boats: 2400 HP nightmare.
Posts: 1,437
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by Sean H
i think i saw a block that matched those in your shop...
Soon to be a target.....then a wall display.
WeaponX is offline  
Reply With Quote
Old 10-18-2006, 11:26 PM
  #88
Registered
Thread Starter
 
44MTI's Avatar
 
Join Date: May 2003
Location: E-Dock
My Boats: 08' 44 MTI
Posts: 3,128
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by JCPERF
588cu in
So do you like this (588)better that a 557 or 572 with 4.375 stroke?

Also are you guys running the same 6.635 rod with both stroke combo's.
44MTI is offline  
Reply With Quote
Old 10-19-2006, 09:56 AM
  #89
VIP Member
VIP Member
 
GATORONE's Avatar
 
Join Date: Dec 2001
Location: Florida
Posts: 952
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by JCPERF
588cu in

Must be a mti speedo on your avatar
GATORONE is offline  
Reply With Quote
Old 10-19-2006, 10:18 AM
  #90
Registered
Thread Starter
 
44MTI's Avatar
 
Join Date: May 2003
Location: E-Dock
My Boats: 08' 44 MTI
Posts: 3,128
Default Re: New Engines: 557 or 572

Quote:
Originally Posted by GATORONE
Must be a mti speedo on your avatar
LMAO
44MTI is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dkwestern
General Boating Discussion
9
10-26-2008 03:18 PM
Goin Nuts
General Q & A
13
04-16-2007 11:29 AM
38flatdeck
General Q & A
19
04-30-2006 07:38 AM
Ratchet
General Q & A
54
08-13-2004 12:38 AM
later
General Q & A
1
04-28-2003 12:02 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 06:25 PM.


Copyright 2011 OffShoreOnly. All rights reserved.