Thread:

180 degree water temp?

Is that too hot for a jet boat?

Its a little on the hot side, but it also depends on how your plumbed, weather its correct or not, is the gauge working properly, what time of year is it, are you running 180 when driving or Idling thru long no-wake zones, If you want to test the gauge disconnect the wire to the sending unit on the engine turn the Ign/key to the half way position then ground out the wire to the eng. block, the temp gauge should Peg to max temp. this will tell you that the gauge is somewhat working.

Oil temp

Originally Posted by Chris The Plumber

Its a little on the hot side, but it also depends on how your plumbed, weather its correct or not, is the gauge working properly, what time of year is it, are you running 180 when driving or Idling thru long no-wake zones, If you want to test the gauge disconnect the wire to the sending unit on the engine turn the Ign/key to the half way position then ground out the wire to the eng. block, the temp gauge should Peg to max temp. this will tell you that the gauge is somewhat working.

It really is more like 165 to 175, but I have seen 180 in the middle of Aug. and idling though a no wake zone. The gauge is correct, new sending unit, and have tested.

Originally Posted by H20MOFO

Oil temp

I wish I new. What would be the oil temp if you had 180 degree water? Would it be around 210 degrees?

Alot depends on...alot. Typically I'll see 100* swing from my oil temp to my water temp.(once warmed up)

Originally Posted by MAXXJETT

It really is more like 165 to 175, but I have seen 180 in the middle of Aug. and idling though a no wake zone. The gauge is correct, new sending unit, and have tested.

if you ran a unrestricted water line from the jet and put a presure relief on it your temp. wouldn't change so much from idle to wot. you can check your oil temp. with a infrared gun after a hard run i don't like it to get much over 220 and 160-165 for the water be better especially if you have a engine cover . if your not having any trouble with it detonating (pinging) with 175* water you might get a little more out of it with 160*water temp. and a couple more * advance lots depends on the type of boat and engine .

Originally Posted by Canuc

if you ran a unrestricted water line from the jet and put a presure relief on it your temp. wouldn't change so much from idle to wot. you can check your oil temp. with a infrared gun after a hard run i don't like it to get much over 220 and 160-165 for the water be better especially if you have a engine cover . if your not having any trouble with it detonating (pinging) with 175* water you might get a little more out of it with 160*water temp. and a couple more * advance lots depends on the type of boat and engine .

The motor is a stock Marine Power 454 390HP, and yes the motor is covered. It the t-stat system, would I be better not running it that way?

Check the thermostat. If it has a 160 in it, switch to a 140. Remember a 160 will START to open at 160 and does not fully open until 180.


Darrell.

Originally Posted by DMOORE

Check the thermostat. If it has a 160 in it, switch to a 140. Remember a 160 will START to open at 160 and does not fully open until 180.


Darrell.

It that a special kind that goes inside that housing?

Originally Posted by MAXXJETT

It that a special kind that goes inside that housing?

Not sure on the Marine Power motor. I know the ones in my Merc Racing motors are different than a standard car thermo. Check a Marine Power site for parts listings. But I have a feeling it may be the same type as a Merc unit. If you pull it, try to post a pic.


PS Btw: I run 140 thermo's in my motors, and they run at 160 in the summer.

Darrell.

Originally Posted by DMOORE

Not sure on the Marine Power motor. I know the ones in my Merc Racing motors are different than a standard car thermo. Check a Marine Power site for parts listings. But I have a feeling it may be the same type as a Merc unit. If you pull it, try to post a pic.


PS Btw: I run 140 thermo's in my motors, and they run at 160 in the summer.

Darrell.

Thanks for the help, 160 is what I am looking for.

Originally Posted by DMOORE

Not sure on the Marine Power motor. I know the ones in my Merc Racing motors are different than a standard car thermo. Check a Marine Power site for parts listings. But I have a feeling it may be the same type as a Merc unit. If you pull it, try to post a pic.


PS Btw: I run 140 thermo's in my motors, and they run at 160 in the summer.

Darrell.

it has a lot to do with flow in the system and and how much heat is being exchanged from the engine to the water , but i don't think a t-stat system with a 160* stat in it shouldn't go over 165* if it's working properly and there's nothing wrong with the engine. MAXXJETT do you have a pressure relief or a restriction on your water line from the jet ? i don't think your getting enough flow especially at low rpm from a restrictor or valve at the jet???