Like Tree0Likes

Merc Water pressure relief valve #

Reply
Old 06-17-2005, 10:32 PM
  #41
Registered
 
Crazyhorse's Avatar
 
Join Date: Jan 2001
Location: Holland MI
My Boats: 38 Cigarette flat-deck
Posts: 3,140
Default Re: Merc Water pressure relief valve #

i've got two of these i'd be willing to sell.
Crazyhorse is offline  
Reply With Quote
Old 10-02-2006, 09:03 PM
  #42
Registered User
 
35 White Lightning's Avatar
 
Join Date: Oct 2004
Location: St Louis MO.
My Boats: 1995 35 Lightning
Posts: 260
Default Re: Merc Water pressure relief valve #

Did the relif valves fix the over pressure you had my gauge has been pegged/ where did you dump the water
35 White Lightning is offline  
Reply With Quote
Old 10-02-2006, 09:25 PM
  #43
RLW
~~~~
Charter Member
 
Join Date: Oct 2000
Location: Western New York
Posts: 1,451
Default Re: Merc Water pressure relief valve #

Quote:
Originally Posted by 27 redline fvr
Did the relif valves fix the over pressure you had my gauge has been pegged/ where did you dump the water
I have one and it works great.

Dump the excess water overboard. Mine is through a separate fitting in the side of the boat.
RLW is offline  
Reply With Quote
Old 10-02-2006, 09:46 PM
  #44
Registered
Platinum Member
 
nordic95's Avatar
 
Join Date: Aug 2005
Location: New Jersey
My Boats: 32' Fountain Fever
Posts: 1,838
Default Re: Merc Water pressure relief valve #

Quote:
Originally Posted by Crazyhorse
i've got two of these i'd be willing to sell.
How much do you want for them?I need two.
[email protected]

Nordic95
nordic95 is offline  
Reply With Quote
Old 10-02-2006, 10:05 PM
  #45
Ginger or Mary Ann?
Charter Member
Trade Score: (1)
 
US1 Fountain's Avatar
 
Join Date: Oct 2000
Location: Lafayette. IN
Posts: 10,872
Default Re: Merc Water pressure relief valve #

When I installed mine a couple months ago, they limited the pressure to 25psi as from Merc. I wanted lower pressure, so I ordered a set of springs from MacMasterCarr for a couple bucks. Pressure is now max at 19-20. I also welded a 3/4" bung on the exit side, (back side of the valve) of my silent choice divertor valves to dump the excess water. I didn't want to install thru hull dumps. Just a personal preference. Back4More did the exact same spring replacement as I did at the same time. We both had comparable results.
US1 Fountain is offline  
Reply With Quote
Old 10-02-2006, 10:20 PM
  #46
Registered
Platinum Member
 
nordic95's Avatar
 
Join Date: Aug 2005
Location: New Jersey
My Boats: 32' Fountain Fever
Posts: 1,838
Default Re: Merc Water pressure relief valve #

I was just told by a reputable engine builder that a #6 line off the back of the intake manifold would lower pres. by 5 psi and two #6 lines into a #8 out the boat would drop 10 psi.I am going to try this over the weekend.He also said to remove thermostat and use restricor plate.Any one try any of this already and am I waisting my time?


Nordic95
nordic95 is offline  
Reply With Quote
Old 10-03-2006, 09:25 AM
  #47
rv
Registered
 
Join Date: Dec 2000
Location: Hawthorn Woods, IL
Posts: 1,182
Default Re: Merc Water pressure relief valve #

I heard the same thing from an engine builder too. He didn't indicate the amount of pressure dropped but the configuration is the same.

Rick
rv is offline  
Reply With Quote
Old 10-03-2006, 12:20 PM
  #48
32' SUNSATION
Platinum Member
 
Kanookstr's Avatar
 
Join Date: Feb 2001
Location: MA
My Boats: 2004 SUNSATION 32'
Posts: 1,143
Default Re: Merc Water pressure relief valve #

Quote:
Originally Posted by nordic95
I was just told by a reputable engine builder that a #6 line off the back of the intake manifold would lower pres. by 5 psi and two #6 lines into a #8 out the boat would drop 10 psi.I am going to try this over the weekend.He also said to remove thermostat and use restricor plate.Any one try any of this already and am I waisting my time?


Nordic95
The problem with that is that it lowers pressure threw out the pressure range. You will end up with less pressure at WOT But not enough pressure at lower Rpm's. The pressure relief valve limits the pressure to 25 psi, and it will only dump pressure after 25 psi.
I have tried many different ways of doing this before using a spring type of valve, and none of them worked well enough to supply the correct pressure at all rpm's.
The restrictor plate in the thermostat housing does not work either. That ends up screwing with the engine water temps. And that varies with different lake water temps..

Last edited by Kanookstr; 10-03-2006 at 12:23 PM.
Kanookstr is offline  
Reply With Quote
Old 04-26-2008, 08:48 PM
  #49
Charter Member#330
Charter Member
Trade Score: (1)
 
MrCIG's Avatar
 
Join Date: Oct 2000
Location: CHICAGO, IL
My Boats: 1985 38 Cigarette 2004 Formula 400SS
Posts: 2,371
Default

ttt Mark
__________________
If you like it rough do it OFFSHORE!!!
MrCIG is offline  
Reply With Quote
Old 04-27-2008, 11:01 PM
  #50
Gold Member
Gold Member
 
sunchaser796's Avatar
 
Join Date: Apr 2005
Location: Fort Lauderdale
My Boats: Know Better ,cause I work on them...
Posts: 249
Default

if you are running CMI HEADERS, you need to becareful that you are not depriving water to the headers. Have seen on headerds that too much water flow will cause the headers to turn golden color and if not enough will do the same. On engines with cross overs would not recomend. The location where the pressure releif valve is located is after the oil coolers. Since the cross over does not use a circ pump, you need the pressure for proper cooling..
sunchaser796 is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
cloudmaster_321
General Q & A
28
01-05-2016 10:09 PM
SKRAMER
General Q & A
3
05-21-2008 01:08 PM
klaw
General Q & A
40
04-29-2008 10:31 PM
eliminatethis
General Q & A
3
06-20-2006 02:28 PM
MrCIG
General Q & A
36
05-28-2002 10:14 AM



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 01:50 PM.


Copyright 2011 OffShoreOnly. All rights reserved.