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#311182 - 04/27/07 09:18 PM Re: 350 mag problem [Re: ckc]  
Joined: Jul 2006
Posts: 2,402
prober Offline
Admiral
prober  Offline
Admiral

Joined: Jul 2006
Posts: 2,402
Eastern Washington
Is the oil pressure lower now than before? I would be more concerned with a change in oil pressure than any particular psi. Some oil pumps have the bypass spring set at 40 psi. The psi at idle and at cruise would be helpfull to know and whether any of these things have changed recently. If the noise is coming from the valvetrain you need to stop using it until you assess the damage. It is possible you won't have to do a complete rebuild.

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#311188 - 04/27/07 09:45 PM Re: 350 mag problem [Re: prober]  
Joined: Jan 2005
Posts: 107
ckc Offline
Captain
ckc  Offline
Captain

Joined: Jan 2005
Posts: 107
Madison, WI
Oil pressure has been the same since I took delivery of the boat three years ago. PSI at idle is just above 20 psi when warm.

#311224 - 04/28/07 08:43 AM Re: 350 mag problem [Re: ckc]  
Joined: Jun 2004
Posts: 669
Senoj Offline
Admiral
Senoj  Offline
Admiral

Joined: Jun 2004
Posts: 669
Tennessee
Perhaps this can be accounted for in the differences between gauges, but I have the same motor as you and at anything above idle, my oil pressure is 60 psi. At idle it is right in the middle at 40 psi. On the old motor, the only time it would go below 40 was when the oil level was low on a warm engine.


'04 Cobalt 220 350Mag/MPI


2017 Shelby GT350
1996 Ford F-250 XLT 4x4 7.3 diesel

'11 Ford F-250 6.7 Crewcab -Sold
#311260 - 04/28/07 04:33 PM Re: 350 mag problem [Re: Senoj]  
Joined: Aug 2003
Posts: 450
tommym Offline
Vice Admiral
tommym  Offline
Vice Admiral

Joined: Aug 2003
Posts: 450
Long Island's North Shore, NY
I just had my mag running in the driveway,just like Senoj,I had 40 psi at idle. Tommty


2003 Monterey 245 Cruiser,
"NEVER SATISFIED" Kings Park,NY
#311300 - 04/28/07 11:40 PM Re: 350 mag problem [Re: tommym]  
Joined: Jun 2005
Posts: 9,255
D-Rod Offline
Rock Chalk Jayhawk
D-Rod  Offline
Rock Chalk Jayhawk
Admiral

Joined: Jun 2005
Posts: 9,255
Back Stateside
20 psi? That's pretty low.

Most are around 40 psi at idle, 60+ underway.


-YOLO
#311323 - 04/29/07 07:27 AM Re: 350 mag problem [Re: D-Rod]  
Joined: Oct 2004
Posts: 7,510
BillyB Offline
Admiral
BillyB  Offline
Admiral

Joined: Oct 2004
Posts: 7,510
Peoria, Illinois
I don't know about "most" d, but 20 psi at a warm idle is fine on a SBC. Mine was about 35psi on initial startup yesterday (70+ degrees out). It gets lower after the engine and the 40w oil is warm.


I'm just happy to be here!



#311461 - 04/29/07 11:33 PM Re: 350 mag problem [Re: BillyB]  
Joined: Jan 2005
Posts: 107
ckc Offline
Captain
ckc  Offline
Captain

Joined: Jan 2005
Posts: 107
Madison, WI
Well here is an update. Put on new cap, tested coil, as I told you also put in new plugs and wires. Went out today and it was the best the boat has run since I have owned it. Topped out at just under 5000 rpm, pushing the boat at 52mph. I ran it hard WOT for about 10 minutes and no problem. Pretty respectable for a Signature 240 cabin cruiser. Even the whole shot was better, I am sure it takes quite a bit of juice to turn the 26 pitch duals that are on the bravo III. Overall I am happy that the problem did not re-occur. I will keep all of you updated and I appreciate all the input that I recieved. This is a great forum.

#311762 - 04/30/07 09:19 PM Re: 350 mag problem [Re: ckc]  
Joined: Jan 2004
Posts: 12,012
WaterMutt Offline
Bilge Rat
WaterMutt  Offline
Bilge Rat
Admiral

Joined: Jan 2004
Posts: 12,012
Massachusetts
Very glad to hear it was something that easily fixed. Have a great season.


Malibu Wakesetter 23XTI
Bryant 214 Limited (gone, but not forgotten)

"That's my boat..."
-Forest Gump

#312009 - 05/01/07 06:13 PM Re: 350 mag problem [Re: WaterMutt]  
Joined: Feb 2003
Posts: 11,676
Frantically Relaxing Offline
Admiral
Frantically Relaxing  Offline
Admiral

Joined: Feb 2003
Posts: 11,676
Just a couple of thoughts--

First, I've had several engines in my day do the ticking thing after a hard run followed by a 'sudden' slow-down. Usually cars, but I remember the 460 in my Kona would also do it. I've always figured the reason is simply gravity and the inertia of the oil flowing out of the lower half of the engine faster than the pump is pumping (during the sudden engine slowdown) will actually siphon oil out of the lifters momentarily. This is also when the oil is at it's least viscous, so it may take awhile for the lifters to pump up...

As for the sudden loss of power, I've had that happen several times over the years too. And it's usually caused by something wrapped around the prop, like a piece of someone's rope, or some seaweed. So whenever it happens, I always raise the drive to check the prop!

#312077 - 05/01/07 11:00 PM Re: 350 mag problem [Re: Frantically Relaxing]  
Joined: Jan 2005
Posts: 107
ckc Offline
Captain
ckc  Offline
Captain

Joined: Jan 2005
Posts: 107
Madison, WI
Thanks again guys, just for piece of mind I brought it in to the dealer, had them hook to the computer to see if it was throwing any codes and it was not. They also cut the lights to see if any arching was occuring and it was not. So, for now it is good to go.

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