Cooling Question - How much water comes from the pump?
+ Reply to Thread
Results 1 to 4 of 4

Thread:
Cooling Question - How much water comes from the pump?

  1. #1
    Member Hibbitz's Avatar
    Join Date
    Jul 2012
    Location
    Boston, MA
    Posts
    78

    Default Cooling Question - How much water comes from the pump?

    Hey guys.. I am hoping someone here can possibly help with my question.


    I am building a bit of a different jet boat that I'm setting up so it can be run in salt water from time to time.
    http://www.performanceboats.com/jet-...s-project.html


    Because I want to set up a closed loop cooling system for the block I have purchased a heat exchanger setup from a Mercrusier 350 engine. What I am trying to determine is if I need to rig up a crank mounted raw water pump to push the lake or salt water through the exchanger and out the mainfolds/exhaust.

    Click image for larger version. 

Name:	Screen Shot 2015-01-09 at 3.37.42 PM.jpg 
Views:	76 
Size:	21.8 KB 
ID:	669786

    I've just seen some info and videos that the pressure form the line that comes from the jet can get pretty high (to the point were people run reducing valves) so I've started to think that I may not need this additional pump.

    Assuming that there might be cooling issues during extended periods of idling with low water flow from the jet, are their any thoughts as to if an addition pump might be need based on how much water is delivered from the jet?

    Sort Version - is the water delivered from the jet during normal operation (mid rpm) equivalent to a garden hose... more / less?

    Thanks,

    Kent

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member hihosilver's Avatar
    Join Date
    Mar 2009
    Location
    bullhead city
    Posts
    500

    Default

    the pump puts out lots of water for heat exchanger it might need a reg for pressure

  4. #3
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,463

    Default

    Kent is not likely you will want or require the small crank mounted Johnson style pump particularly in light of your newly aquired converted Jacuzzi drive , the drive should deliver all the pressure and volume you need , we would rig it to where raw water passes thru the sand filter and thru the heat exchanger and then exits via the rizers

    This was a similar setup we repowered a while back

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Member Hibbitz's Avatar
    Join Date
    Jul 2012
    Location
    Boston, MA
    Posts
    78

    Default Thanks

    Tom,


    Thanks for the info and the photo (nice setup by the way). This is great news and I think I will see about going this route for my heat exchanger setup. I'll do some more investigation about possibly putting a pressure reducer inline before the exchanger but not buying a mounted crank mounted raw water pump and formed hoses certainly helps my diverter budget!


    Kent

+ Reply to Thread

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


Tags for this Thread

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