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cooling an10

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GT Jets

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« 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)
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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


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steves86ta

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« 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
1980 Bahner 21' Mini Day
1968 Rogers project

GT Jets

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« 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
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

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« 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
1980 Bahner 21' Mini Day
1968 Rogers project

GT Jets

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« 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
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

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« 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
1980 Bahner 21' Mini Day
1968 Rogers project

jyeager

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« 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
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