BBC intake hot spots
Results 1 to 6 of 6

Thread:
BBC intake hot spots

  1. #1
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,463

    Default BBC intake hot spots

    With a fresh BBC install I decided to drop a electrical temp sender into the intake manifold water passage at the right rear corner of my blower intake was surprised that the temp was significantly higher than the manual head temp reading at the water outlet at the front of the intake have hear of people actually plumbing these or running bypasses etc ? anyone Tom
    Quick reply to this message Reply  

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    Dec 2007
    Location
    Newbury Park, Ca/Mohave Valley, Az
    Posts
    8,169

    Default Bud Gilbert

    Quote Originally Posted by jetboatperformance View Post
    With a fresh BBC install I decided to drop a electrical temp sender into the intake manifold water passage at the right rear corner of my blower intake was surprised that the temp was significantly higher than the manual head temp reading at the water outlet at the front of the intake have hear of people actually plumbing these or running bypasses etc ? anyone Tom
    I once questioned Bud Gilbert, (RIP Bud), the long time engine guru from your area, and he said NO... Don't pull water from there as it upsets the "flow" through the block and heads.... As he put it to me, "That was one thing GM got right".....
    Ray
    LOUD BOATS SAVE LIVES
    Quick reply to this message Reply  

  4. #3
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Tom, although what Ray said about Bud's warning not to disrupt the water flow path thru the block is valid, there are things you can do without "disrupting" the flow path.
    Most if not all the blown GNs. KEEP IN MIND THAT ALMOST ALL N/A MANIFOLD HAVE A FRONT WATER CROSS OVER BUILT INTO THE MANIFOLD. ITS INCREDABLY IMPORTANT TO REALIZE THAT THE BLOWER MANIFOLD DOES NOT HAVE THIS BUILT IN CROSS OVER

    In order of effectiveness

    Run a balance line between the 2 rear water ports. This has much less effect if you already have some sort of balance/manifold deal at the front water pump/ports. Built its still has some effect

    Run a line between the two rear ports and tee them together with a single line overboard, NO BIGGER THAN A -6!
    We use a 1/2 MIP X -6 X -6 Tee screwed into one rear port, the -6 side branch goes over to the other head, and the -6 on the run goes overboard.
    Between the balance line on the front between the 2 inlets, and the rear "bleed" we can run our deal warmer than most and not get into detnation because of the rear over heating.

    Because of the way the water exits the water pump, I am a firm believer in a balancing line between the water inlet ports, or the use of a Merc type water cross over manifold. With out it, there is no balance between the 2 side of the block. They are 100% isolated from each other when using a blower manifold.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
    Quick reply to this message Reply  

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member SHAWN DAVIS's Avatar
    Join Date
    Jan 2012
    Location
    lake Charles, Louisiana
    Posts
    640

    Default

    Some use a real small line, like 1/4" inch as a bleeder from the rear outlets, works. I had a friend was trying to reinvent the wheel and used a couple 1" lines, front and rear. Blown 600" offshore car couldnt make it 30 minutes before melting the valve cover gaskets,valve stem seals valves and pistons on the center 4 pistons.
    Bad thing is he tried it about 3 times!!
    Quick reply to this message Reply  

  7. #5
    Senior Member ICECREAMAN's Avatar
    Join Date
    May 2009
    Posts
    2,426

    Default

    I have this same set up and was cosidering a balance tube betwee the 2 rear ports when I was plumbing my motor. I didn't know if it would hurt or help, so I left them plugged. Is there any reason I couldn't run a 1/4" balance tube in the same fashion GN7 describes and tee it into an existing dump line? I am already running 2 overboard dumps, 1 off the oil cooler and 1 straight out from the front port of the intake manifold. I really don't want to drill for a 3rd dump. Do you think the exit pressure would be high enough in one of the main dump lines to block the small line from working? Or would it work more like a venturi and actually pull water from the small line? This is a new install that hasn't seen the water yet, so any potential problem I can eliminate before it happens is good.
    Quick reply to this message Reply  

  8. #6
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by ICECREAMAN View Post
    I have this same set up and was cosidering a balance tube betwee the 2 rear ports when I was plumbing my motor. I didn't know if it would hurt or help, so I left them plugged. Is there any reason I couldn't run a 1/4" balance tube in the same fashion GN7 describes and tee it into an existing dump line? I am already running 2 overboard dumps, 1 off the oil cooler and 1 straight out from the front port of the intake manifold. I really don't want to drill for a 3rd dump. Do you think the exit pressure would be high enough in one of the main dump lines to block the small line from working? Or would it work more like a venturi and actually pull water from the small line? This is a new install that hasn't seen the water yet, so any potential problem I can eliminate before it happens is good.
    Yeah you can tie it into the existing dump.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
    Quick reply to this message Reply  

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