[DeTomaso] Water Flow Direction?

[Tomas Gunnarsson]

The heater valve will not stay shut if the flow is in one direction and will stay shut in the other. I don't know what way the factory hooked the heater up but after changing the flow to the self sealing direction on my car I have experienced tremendous improvement of its function. The argument that the heater core will not be under pressure if the valve is on one side of the core or the other is not particularly interesting. The system pressure is way higher than the pressure difference between pump inlet and outlet. The only thing to do from a safety point is to install shut off valves in both lines.

Tomas
	


> Från: MikeLDrew at aol.com
> Till: artstephens at charter.net, detomaso at realbig.com
> Rubrik: Re: [DeTomaso] Water Flow Direction?
> Datum:  Tue, 22 Jan 2008 17:40:21 EST

> In a message dated 1/22/08 13 23 26, <a href=mailto:"artstephens at charter.net">artstephens at charter.net</a> writes:
> 
> 
> >      I'm trying to hook up my new heater lines to my Edelbrock water
> pump 
> > and I would like to know if the hot water flows from the small fitting on
> the 
> > block to the heater,  to the water pump?  Or is it hot water from the
> pump,  
> > to the heater and then to the block?  Does it matter which of the two
> ports 
> > on the water pump that I use?  And why would there be two ports on the
> pump 
> > anyway?
> > 
> 
> I dunno why there are two ports.   My heater is currently non-functional;
> my 
> car has a U-shaped hose connecting the water pump to the fitting on the
> block. 
>   FWIW, I think the ports on the pump are two different sizes?   My bottom 
> port (which I believe is smaller, on my Weiand water pump casting) is
> blocked 
> off, and the heater hose is connected to the top port on the water pump.
> 
> There has been some debate on this forum as to the wise plan for hooking up
> 
> the heater.   The stock system has hot water coming from the motor, through
> the 
> core, and then stopping against the heater valve; opening the valve allows 
> water to circulate back to the engine.   Some people advocate switching the
> 
> input and output hoses to put the input so that it hits the valve first;
> there are 
> several reasons for this, none of which comes to mind at the moment.   If I
> 
> remember the discussion here properly, Tomas Gunnerson was a staunch
> advocate 
> of swapping the hoses around, and then some other people presented an
> opposing 
> view, something to do with the design of the heater valve, or something
> like 
> that.
> 
> Mike
> 
> 
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