Like Tree0Likes

Need your info and advice on drive engagement

Reply
Old 08-11-2009, 10:12 PM
  #1
Registered
Thread Starter
 
nitrousnolan's Avatar
 
Join Date: Jun 2005
Location: NY
My Boats: Just A Rider
Posts: 716
Default Need your info and advice on drive engagement

I have a Fountain we just put a set of 557ci 750hp motors N/A in with Xr's with Stelling boxes, right now the motors idle at 900 rpm and drop to 600 rpm when in gear, they go in and out of gesr very smooth no clunk or bang. I have 1:36 drives with 30 5 blade maxis props, we have 1050 dominators on the motors so its important to keep the vacuum up to keep the power valve from opening at idle and causing them to flood out. Do you think 900 is to high for engagement and what do your motors idle at when you put them in and out of gear? Thanks in advance.

Last edited by nitrousnolan; 08-11-2009 at 10:14 PM.
nitrousnolan is offline  
Reply With Quote
Old 08-12-2009, 12:56 PM
  #2
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,744
Default

900rpms is not a problem. 1000rpms or more and it will be hard on them.
Griff is offline  
Reply With Quote
Old 08-12-2009, 01:13 PM
  #3
VIP Member
VIP Member
 
Join Date: Nov 2002
Location: ankeny,ia.
Posts: 3,449
Default

I have 575SCi's ( slightly mod'ed)
1.5 XR's with stelling boxes and 32 maximus's.

The idle is set at 900 rpm's and it shifts fine.
JaayTeee is online now  
Reply With Quote
Old 08-12-2009, 02:49 PM
  #4
Registered
Trade Score: (2)
 
TxHawk's Avatar
 
Join Date: Mar 2003
Location: Dallas
My Boats: Excalibur 27 Flat Deck Restomod
Posts: 2,940
Default

I have the same issue. Depending on the temperature, run time, etc. my 572's do not want to idle below 1000 rpms's at times. Depending on my surroundings, I try to start them in gear when I can. Too much time around the outboard guys I guess?
TxHawk is offline  
Reply With Quote
Old 08-12-2009, 03:14 PM
  #5
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

I've owned and worked on Bravo boats shifting anywhere between 700 and 1100 rpms. Once you get to 1000 rpms level it starts to slam the clutch into the cone a bit.

With the right set-up of carb, power valve and vacuum you should be able to get it to shift. That is of course you don't have an extremely radical cam with a load of duration up in the 700's lift.
Panther is offline  
Reply With Quote
Old 08-12-2009, 03:30 PM
  #6
Registered
 
Back4More's Avatar
 
Join Date: Feb 2002
Location: Lake Michigan
My Boats: 353 Fastech
Posts: 6,624
Default

Should be fine...mine have been doing that for 4 years/186 hrs.
Back4More is offline  
Reply With Quote
Old 08-12-2009, 04:58 PM
  #7
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

Quote:
Originally Posted by nitrousnolan View Post
we have 1050 dominators on the motors so its important to keep the vacuum up to keep the power valve from opening at idle and causing them to flood out.
Having mentioned leak-down due to vacuum and powervalves, what powervalves are you running?

You may need to bring them down to 4.5's or 5.5's if you're running 6.5's. If you still can't get it right, adjust the secondary butterfly (small set screw) to open a little bit and that should help with your idle quality.
Panther is offline  
Reply With Quote
Old 08-12-2009, 06:14 PM
  #8
Registered
 
Join Date: Jun 2008
Location: wendell,nc
My Boats: 94 fountain 27
Posts: 57
Default

been there done that had same problem with 510 ci mega blower, double check timming and check vacume, had to go down on power valves and slightly open hole in throtle plates.
topfueleb is offline  
Reply With Quote
Old 08-21-2009, 12:48 AM
  #9
Rob
VIP Member
Trade Score: (6)
 
Strip Poker 388's Avatar
 
Join Date: Aug 2001
Location: Madison,Mississippi
My Boats: Hustler 388
Posts: 21,567
Default

have ya played with the idle screws,does your model have a mid circuit,ck the throttle blades are set the same,

ya might have to play with the fuel idle restrict ors if ya have the jets,thats a pain in the ass
__________________
.

The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
Strip Poker 388 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 01:52 PM.


Copyright 2011 OffShoreOnly. All rights reserved.