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Thread: Heater and manifold bypass - RRC v8

  1. #1
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    Heater and manifold bypass - RRC v8

    Does anyone know/have experience with/provide advice on looping the heater hose on a 3.5 v8 so that it does not go via the manifold to the heater and back

    In other words if take a pipe off the back of the water pump and loop it back round to the other heater fitting on back of the pump (a loop as sealing caps tend to leak) how will that impact running in QLD

    Is there any value in manifold warming in the QLD climate?

    Running forced induction

    Skiboy

    89 Orange Rangie UTE - our play thing - sadly now sold
    75 Rangie/Series/Hybrid - Bumblebee with a sting!!!!
    2012 RRS - The new touring vehicle

  2. #2
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    Carby engines get their hot water supply under the carbies from the area behind the thermostat, looping hoses at the pump back plate will not loop the flow. You would have to remove the thermostat to see inside to where the water passage goes to see if you could block it off, then fit an elbow into the manifold to allow flow to one of the suction ports at the water pump back side. You will still have to cap or plug both the front and rear outlet of the inlet manifold unless your internal block is perfect.

  3. #3
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    Thanks bee utey
    I will look at where the pipes run this weekend but I think mine by passes the manifold.

    Mine has a short hose to a pipe through the front of the manifold and out the back above the bell housing.
    See clip below from the Stage One manual - the pipe is shown to the side. This goes to the heater and then the return hose goes to back of the water pump (currently sealed off).

    Manifold.jpg

    89 Orange Rangie UTE - our play thing - sadly now sold
    75 Rangie/Series/Hybrid - Bumblebee with a sting!!!!
    2012 RRS - The new touring vehicle

  4. #4
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    Quote Originally Posted by Skiboy View Post
    Thanks bee utey
    I will look at where the pipes run this weekend but I think mine by passes the manifold.

    Mine has a short hose to a pipe through the front of the manifold and out the back above the bell housing.
    See clip below from the Stage One manual - the pipe is shown to the side. This goes to the heater and then the return hose goes to back of the water pump (currently sealed off).

    Manifold.jpg
    What your picture shows is the heater outlet at the back of the manifold (bolted on with a gasket) and a separate return pipe to the water pump. Both fittings at the back of the water pump are return fittings as they hit the back of the spinning impeller, a suction zone. Most carby manifolds also have an outlet facing forwards that allows coolant to travel back to the pump without going through the heater but your picture doesn't show that.

  5. #5
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    OK I am going to have to look at the actual truck set up

    My heater is capped off: (1) the back/rear of the manifold and (2) (the return I presume) at the back of the water pump.

    I thought the back of the manifold (if connected) went to the heater then back via hose (I have no pipe or hose) to the back of the water pump.

    89 Orange Rangie UTE - our play thing - sadly now sold
    75 Rangie/Series/Hybrid - Bumblebee with a sting!!!!
    2012 RRS - The new touring vehicle

  6. #6
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    I have (what I understand to be) a p76 V8. Dont ask me if it's similar to your engine - I'm no authority there!

    My heater has been bypassed - I bought it like that. It appears that in order to achieve this, all that's been done is that the water pump outlet/inlet pipes have been cut and plugged. Nothing more complex. The ends of the pipes are sitting on the valley pan.

    I can try to take a photo, but no guarantees you can see anything as it's quite congested in the V valley area - at the fan end.

    However, I am also led to believe that having a functional heater is a roadworthy requirement (if it were to be reassessed) - I assume it's because you need a way of demisting the windscreen so you can see!

    Anyway, that's my 2c.
    Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
    Sadly Gone: '77 RRC 2 Door aka "Beast"
    Gone: '92 RRC Vogue SE aka "The Family Bus"
    Long Gone: '99 Td5 Defender aka "The TANK!"

  7. #7
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    OK thanks

    I have air con at the top of the windscreen that demists anyway - an after market system using a rear discovery air unit and modified roof pipes/vents from the back of a discovery (a fully optioned Japan half cut import truck)

    So when mine Stage One (defender) body swap was engineered it met the requirements for demisting under the ADRs

    But as I have all the bits (including new heater core) installed I was thinking of connecting up as I have had leak issues in both the blocked off heater water lines. Flowing would seem to reduce pressure, hose cap failure and corrosion risks.

    Just wondered what others had.

    89 Orange Rangie UTE - our play thing - sadly now sold
    75 Rangie/Series/Hybrid - Bumblebee with a sting!!!!
    2012 RRS - The new touring vehicle

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