water pressure
#11
Registered
I have a 454 with a Mercury pressure relif valve.
I run between 7-15 max depending on trim.
I also have a shorty.
I thought this was way too low as the pressure releif is "set" for 30 or so pounds so I am told. Changed out the water pressure gauge with another new one (Autometer) and they both read the same.
I have no over heating issues, boat runs 160-170.
Ken
I run between 7-15 max depending on trim.
I also have a shorty.
I thought this was way too low as the pressure releif is "set" for 30 or so pounds so I am told. Changed out the water pressure gauge with another new one (Autometer) and they both read the same.
I have no over heating issues, boat runs 160-170.
Ken
#12
Charter Member # 55
Charter Member
I have a 454 with a Mercury pressure relif valve.
I run between 7-15 max depending on trim.
I also have a shorty.
I thought this was way too low as the pressure releif is "set" for 30 or so pounds so I am told. Changed out the water pressure gauge with another new one (Autometer) and they both read the same.
I have no over heating issues, boat runs 160-170.
Ken
I run between 7-15 max depending on trim.
I also have a shorty.
I thought this was way too low as the pressure releif is "set" for 30 or so pounds so I am told. Changed out the water pressure gauge with another new one (Autometer) and they both read the same.
I have no over heating issues, boat runs 160-170.
Ken
#13
Registered
Thread Starter
Join Date: Jul 2005
Location: gasport ny
Posts: 65
Likes: 0
Received 0 Likes
on
0 Posts
well i had the plastic pump crack when the impeller came apart so i put the stainless pump on. lot of water comes in when the pump cracks !! have about 5 hours on the pump then blew the hose going from the pump to the oil cooler. sooo i put good hose back on there instead of the molded hose junk and an autometer pressure gauge in. just a stock 502 mag mpi in a 96 272 but i was expecting the pressure to be much higher with a new pump and cold with the thermostat closed. hardin directions say the side of the pump is tapped for a pressure gauge but those can't be the right readings. but then again you guys seem to have low readings too. twin spins says he gets about 20-30 running, that was more what i was expecting. thanks
Last edited by perky2196; 10-14-2010 at 07:19 PM.
#14
Registered
well i had the plastic pump crack when the impeller came apart so i put the stainless pump on. lot of water comes in when the pump cracks !! have about 5 hours on the pump then blew the hose going from the pump to the oil cooler. sooo i put good hose back on there instead of the molded hose junk and an autometer pressure gauge in. just a stock 502 mag mpi in a 96 272 but i was expecting the pressure to be much higher with a new pump and cold with the thermostat closed. hardin directions say the side of the pump is tapped for a pressure gauge but those can't be the right readings. but then again you guys seem to have low readings too. twin spins says he gets about 20-30 running, that was more what i was expecting. thanks
#15
Registered
There was a plug there and i used the hole.
Dumps water at 1500 RPM.
Ken
#16
87cafe
VIP Member
Join Date: Jan 2009
Location: gulfport ms
Posts: 342
Likes: 0
Received 0 Likes
on
0 Posts
i have 468s., at idel ive never had pressure acording to my guage, but at running speeds i get anywhare 5 to 20 psi, boat never runs hot idel after running temp is about 150- running about 120-140, my boat has always run cool and very good, and i have a crossover pipe!
#18
Registered
Thread Starter
Join Date: Jul 2005
Location: gasport ny
Posts: 65
Likes: 0
Received 0 Likes
on
0 Posts
excellent point. i don't know why i didn't think of that. you are correct. for some reason i thought it would be higher. thanks
#19
Registered
I was just told this past weekend that I should plumb the water pressure line somewere BELOW the thermostat. Right now I am above it.
Should this make a difference?
Ken
Should this make a difference?
Ken
#20
Registered
Mine is plumbed into the intake, next to the thermostat.
1/8 tube to the autometer gauge.
barely reads anything at idle. 10-15psi at speeds below 50 20-25 at 50-60mph. 25-35 at 60-80mph. I also have a low water pickup, which I think adds to the higher psi.
I plan to instal a relief valve pretty soon.
1/8 tube to the autometer gauge.
barely reads anything at idle. 10-15psi at speeds below 50 20-25 at 50-60mph. 25-35 at 60-80mph. I also have a low water pickup, which I think adds to the higher psi.
I plan to instal a relief valve pretty soon.