Re: [xj-s] Dual drive water pump (was overheating)

["Kirbert" <palmk@mailer.gadcomm.net>]

> From:          Edwin Hyatt <eahyatt@icanect.net>
> OK guys, lets try some wishful thinking here. It could be possible to put
> something like a fuel pump in the heater line.

Actually, not a bad idea.  I would add a couple suggestions.  First, 
the stock heater line comes out of the A bank; for this purpose, it 
would probably be a better idea to tap into the B bank and tee both 
sources together to go to this pump and the heater valve.  It 
wouldn't change the heater operation, but it might help the pump 
circulate coolant through the B bank after shutdown.

> Under normal conditions, it is out of the loop (heater valve
> closed) but once the car is off, we open the valve to let coolant thru...

I *think* that happens already.  The heater valve is held shut by 
manifold vacuum, and whenever the engine is shut off it opens up.  
I'm just not sure how long it takes; I'll have to watch it sometime.

> operate the
> pump thru a timer and we have circulation. It might not be enough to go thru the
> entire system but its a start.

Actually, it would make it through the whole system except for the 
radiator.  Interestingly, I think we could fix this easily, too.  The 
entire reason it returns to the radiator outlet is in order to get 
enough pressure drop to flow coolant.  But we now have a pump in the 
line!  So, forget about relying on water pump pressure to feed the 
heater core, instead just turn on the pump whenever heating is called 
for -- and replumb the heater core output to radiator INPUT.

> The question is how much coolant will get past the
> regular water pump since it is not moving.

Plenty, it's a centrifugal pump, which means it's a big open hole in 
the line when not moving.

> Of course, while we are wishing, lets add
> a clutch to the water pump to allow it to free wheel when the vehicle is off.

No need, and excessively complicated -- like those one-way clutches 
on the system mentioned before.

> Obviously, we would have to use a non-FI electric pump 7-12 psi rather than a FI
> pump at >36 psi to protect the system.

I'm still thinking about other types of fluid pumps, including the 
ones intended for block heaters.

> Hot shutdowns would be eliminated, dropped valve seats would be a thing of the pass
> and the person who puts this idea to design and production could be a very rich
> person.

Fat chance.  Everyone on this list will be building their own, and 
everyone else will fail to understand the idea.

> Of course, I'm sure they would be willing to split the royalties
> with everyone on the list. 

Sold!

 -- Kirbert      |     If anything is to be accomplished,
                 |     some rules must be broken.
                 |          - Palm's Postulate

---

Follow-Ups:

• Re: [xj-s] Dual drive water pump (was overheating)
• From: John Napoli <jgn@li.net>

References:

• Re: [xj-s] Dual drive water pump (was overheating)
• From: Edwin Hyatt <eahyatt@icanect.net>

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