Has anyone tried this??
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 22

Thread:
Has anyone tried this??

  1. #1
    Senior Member Widetrack's Avatar
    Join Date
    Jan 2008
    Location
    Southwest corner AR
    Posts
    4,045

    Default Has anyone tried this??

    I was talking to a jet boater and he was telling me to run my infeed water lines into the block drains on the bottom of the block! Has anyone tried this? He said there were some advantages to running this setup! 1 block is always drained of water. 2 Cooling oil first. 3 Always fully load block with water. What do yall think!

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    B1 Racing cs19's Avatar
    Join Date
    Dec 2007
    Posts
    6,523

    Default

    I know a few people who have done it that way,
    B1Racing.net

  4. #3
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Quote Originally Posted by cs19 View Post
    I know a few people who have done it that way,
    Don't know the exhaust you are using but cooling block first is a good thing. What temp does the motor run at now???? I run the water thru my logs first to warm and then thru the motor and out, motor runs at 160 to 190 which is perfect.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Rollin With Fink fasterthanu's Avatar
    Join Date
    Jan 2008
    Location
    Norcal
    Posts
    583

    Default

    Heres my experiance and only mine. Did it that way on a gen 5 motor, ran cool at wot and a little below. At cruise and idle it got way to hot and I could not control it. If you go away for the weekend to try it, bring your old hoses

  7. #5
    Senior Member
    Join Date
    Dec 2007
    Location
    corona calif
    Posts
    1,119

    Default Cooling

    GM spent alot of time on R&D to come up with there cooling system. Stick with the standard way of plumbing and you can't go wrong.

  8. #6
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Greg, Goes with what I have said for years. Auto mototive builders have spent hours testing to make a motor last. Ideal temps and proper running temp of motor.It would be to hard to tell all the guys running at 120 to 140 all day long the big three are wrong, Tempeture in the motor makes motors last and build power.My 2 cents. M

  9. #7
    www.highflowdynamics.com LakesOnly's Avatar
    Join Date
    Dec 2007
    Location
    San Francisco Bay Area
    Posts
    1,160

    Cool

    Quote Originally Posted by Widetrack View Post
    ...a jet boater...was telling me to run my infeed water lines into the block drains on the bottom of the block! Has anyone tried this? He said there were some advantages to running this setup!
    Automotive passenger car engines use a closed cooling system where heated water is always entering the engine. As a result, the water temperature throughout the cylinder block is reasonably uniform.

    But most high performance jet boats force lake-cold water right smack into the front two cylinders of the engine block. Depending on how optimally you've managed to maintain the operating temp of your engine, it is not too uncommon, upon disassembly, to see accelerated wear in the front to cylinders because they don't have the chance to get to full operating temperture as do the rear six cylinders in the block.

    One way that some people have tried to "even out" this operating temperature differential is by plumbing the water inlet at the middle of the block, specifically the block cooling system drain holes.

    I'd say that if you are going to attempt this, then do not try it with the tiny NPT-threaded drain back holes that are currently in place for draining the block. They should be enlarged and retapped to a larger thread size so that the newly installed fitting has enough ID to allow water to flow.

    Will this even out the temperature differential? I don't know, as I've never researched it. But bear in mind that your V8 engine's head gaskets have holes in them allow the water to pass from the block to the cylinder heads, and these holes get larger as the you inspect the head gasket from the front of engine to the rear. In other words, the gaskets are engineered so that as water enters from the normal locaton (waterpump holes), it will be influenced to flow toward the rear of the block rather than just turn straight up to pass right through the head at the front and then out the intake manifold/thermostat housing (thereby causing the rear of the engine to have stagnant water and run hot). The cooling system is desinged so that water flows front-to-rear. Of course, this does not help the "overcooling" situation at the front two cylinders, but the other question is: how is this system affected when you plumb at the middle fo the block? Think about it...hmmmmmmmmmm.

    LO
    Last edited by LakesOnly; 04-07-2008 at 07:08 PM.
    High Flow Dynamics
    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2017 Paul Kane. No copying, linking, printing or otherwise without express written permission.

  10. #8
    SR
    SR is offline
    Cajun Member SR's Avatar
    Join Date
    Jan 2008
    Location
    Laf. Louisiana
    Posts
    1,436

    Default

    I drive a 93 1 ton dually with stock tbi 454,at 80,000 miles the thermostat hung up so I removed it.I was told after removing it that the motor was designed to operate at 180 - 200.I never put it back in,(happy the motor was not on the threshold of over heating living in the hot ass gulf region). It stays at 110-130 unless I'm in traffic or towing.I have 258,000 miles with no trouble,no smoke,no blow by that i can see.It makes me wonder about the correct temp a motor will survive the longest at.

  11. #9
    www.highflowdynamics.com LakesOnly's Avatar
    Join Date
    Dec 2007
    Location
    San Francisco Bay Area
    Posts
    1,160

    Cool

    Quote Originally Posted by SWAMP-ROOSTER View Post
    I drive a 93 1 ton dually with stock tbi 454,at 80,000 miles the thermostat hung up so I removed it.I was told after removing it that the motor was designed to operate at 180 - 200.I never put it back in,(happy the motor was not on the threshold of over heating living in the hot ass gulf region). It stays at 110-130 unless I'm in traffic or towing.I have 258,000 miles with no trouble,no smoke,no blow by that i can see.It makes me wonder about the correct temp a motor will survive the longest at.
    It will survive longer at 200* F than it will at 130* F. Probably make a little more power, too. The internal combustion engine is a "heat" engine and for a number of reasons works better with a certain amount of internal heat.

    LO
    High Flow Dynamics
    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2017 Paul Kane. No copying, linking, printing or otherwise without express written permission.

  12. #10
    SR
    SR is offline
    Cajun Member SR's Avatar
    Join Date
    Jan 2008
    Location
    Laf. Louisiana
    Posts
    1,436

    Default

    Quote Originally Posted by LakesOnly View Post
    It will survive longer at 200* F than it will at 130* F. Probably make a little more power, too. The internal combustion engine is a "heat" engine and for a number of reasons works better with a certain amount of internal heat.

    LO
    What would be the correct temp to keep a jet boat motor at to extract the most power and longevity,with out a thermostat I don't remember seeing over 135-140.

  13. #11
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default How about backwards

    I'm not tryin to thread jack. But while the subject is brought up. What about running it bass-akwards?? heads down??
    Another Hot Boat refugee

  14. #12
    SR
    SR is offline
    Cajun Member SR's Avatar
    Join Date
    Jan 2008
    Location
    Laf. Louisiana
    Posts
    1,436

    Default

    Sorry about jackin ya thread WT.

  15. #13
    jetboataholic HawaiianJet's Avatar
    Join Date
    Mar 2008
    Location
    Lexington, KY
    Posts
    2,798

    Default

    Quote Originally Posted by H20MOFO View Post
    I'm not tryin to thread jack. But while the subject is brought up. What about running it bass-akwards?? heads down??
    No thread jack there. It is based off the original question. Good question, might help solve the cold front cylinders thing, but I'm not a mechanic or someone who knows a lot about engines. So, I don't know?

  16. #14
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,463

    Arrow

    Wide ,Old school V -drive boats were sometimes plumbed that way and it probably worked for them (seen a few) these "basically automotive" motors were designed to have coolant/water flow '"up" from the water pump inlet area thru the block and heads and out the out intake "T-stat" hsg Kreg Ive seen a few plumbed backa$$wards that always ran hot just my Heat rises ! 02 Tom

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95