Need your info and advice on drive engagement
08-11-2009 | 09:12 PM
#1
Thread Starter
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Joined: Jun 2005
Posts: 716
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From: NY
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 09:14 PM.
08-12-2009 | 01:49 PM
#4
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Joined: Mar 2003
Posts: 3,074
Likes: 80
From: Fort Worth, TX
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?
08-12-2009 | 02:14 PM
#5
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
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.
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.
08-12-2009 | 03:58 PM
#7
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
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.
08-20-2009 | 11:48 PM
#9
Rob
Joined: Aug 2001
Posts: 21,637
Likes: 12
From: Ms
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
ya might have to play with the fuel idle restrict ors if ya have the jets,thats a pain in the ass
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