Null


GT Jets

  • Karma: +192/-0
Re: cooling an10
« Reply #25 on: May 16, 2016, 11:38:53 AM »
cliff notes

LS engines have a "steam port" at all 4 corners of the heads. In a car, typically the rear ones are blocked off and the front two are sent back into the cooling system. (atleast the newer ones early ones had all 4 going to the radiator)

I plumbed all 4 into a tee then overboard. If you dont its been discovered it can cause hot spots.. I did all 4 to be safe

Couple of pics



*OLD PIC*



hard to see, but you can see the rear two



Then I would reduce the outlet dump size on the bulkhead fitting.

Do you have any idea what the block pressure runs?
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

  • Karma: +41/-0
Re: cooling an10
« Reply #26 on: May 16, 2016, 11:39:33 AM »
Then I would reduce the outlet dump size on the bulkhead fitting.

Do you have any idea what the block pressure runs?

Nope. Thought about getting a gauge
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
1980 Bahner 21' Mini Day
1968 Rogers project

GT Jets

  • Karma: +192/-0
Re: cooling an10
« Reply #27 on: May 16, 2016, 11:41:36 AM »
Nope. Thought about getting a gauge

My initial suspicion would be that it's probably pretty low (thinking under 10psi). I need to read up on the steam vents. Are you running a block mounted automotive style water pump?

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

  • Karma: +41/-0
Re: cooling an10
« Reply #28 on: May 16, 2016, 11:53:44 AM »
My initial suspicion would be that it's probably pretty low (thinking under 10psi). I need to read up on the steam vents. Are you running a block mounted automotive style water pump?

GT

Nope.
From the jet to gate valve
Gate valve to a tee
Tee into block
Out of block to a tee
One end of tee to a ball valve for the headers at my seat (closed all the time now)
Other end of tee overboard

Steam vents directly overboard
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
1980 Bahner 21' Mini Day
1968 Rogers project

GT Jets

  • Karma: +192/-0
Re: cooling an10
« Reply #29 on: May 16, 2016, 01:49:54 PM »
Nope.
From the jet to gate valve
Gate valve to a tee
Tee into block
Out of block to a tee
One end of tee to a ball valve for the headers at my seat (closed all the time now)
Other end of tee overboard

Steam vents directly overboard

I personally would have put the steam lines into the same line as the dump. One outlet overboard.

JMO.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

  • Karma: +41/-0
Re: cooling an10
« Reply #30 on: May 16, 2016, 02:06:57 PM »
I personally would have put the steam lines into the same line as the dump. One outlet overboard.

JMO.

thats a good idea. i might try that...

Maybe i could just drill/tap my tee for the overboard and put the steam lines to that
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party
1980 Bahner 21' Mini Day
1968 Rogers project

jyeager

  • Karma: +62/-0
Re: cooling an10
« Reply #31 on: May 16, 2016, 02:15:45 PM »
I've always ran -8 in and 10 out 👍🏻


Sent from McIntyre Park
  • Boat #1: Southwind Tunnel Dragster 19
  • Boat #2: DiMarco18 V-Bottom
  • Like
    Dislike
    Love
    HaHa
    Angry
    Surprise
    Sad
    Party

 


Null

SMFPacks CMS 1.0.3 © 2026