[Healeys] Heater valve

[m.g.sharp at sympatico.ca]

Just a thought, but I suggest that opening up various constrictions in the system to flow more water through the heater will not necessarily result in more heat.  The hot water from the block needs some resident time in the heater core to transfer heat out to the fins and into the box before it is blown into the car (well sort-of blown assuming other fans work like mine).  I have no idea how to calculate the optimum flow through the heater core to obtain maximum heat transfer, or if it was ever published.

Hope I am not totally off-base with this as I have no evidence, and apologies for my earlier quip about parkas - I live in Canada and winter is looming.

Cheers, Mirek

-----Original Message-----
From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Bob Spidell
Sent: September 27, 2020 12:18 PM
To: healeys at autox.team.net
Subject: Re: [Healeys] Heater valve

I'm confused (yeah, that's a semi-normal state for me). If we're talking about the valve on the heater box--controlled with a push knob on the fascia--it seems like it has a larger opening than the brass valve on the block (the one that most of us forget to exercise and sometimes break the handle off trying to turn; Bob Yule has replacements). Anyway, I'm not a hydraulic engineer, but I gotta believe the flow is limited by the smallest opening in the circuit. It's been a while since I had my block/brass valve on the bench, but I remember a very small opening; about a quarter-inch diameter (it's a simple ball valve). So, opening up the box valve won't accomplish much, if anything, unless there was a way to open up the block valve. Given the block valves are pretty fragile, and not cheap, I'd be loathe to take a drill to it.

Bob

On 9/27/2020 8:08 AM, Stephen Hutchings wrote:
> Actually, I’ve just realized that the link I sent out is for the valve on the block…so, I’ll keep searching for the piece which deals with the heater mounted valve.
>
> Stephen
>
>> On Sep 27, 2020, at 9:17 AM, Chris Dimmock via Healeys <healeys at autox.team.net> wrote:
>>
>> Here in Sydney, Australia, we just turn them off.
>> Who needs a heater?
>> Love your work Perry.
>> Chris
>>
>>> On 27 Sep 2020, at 8:20 am, Perry Small via Healeys <healeys at autox.team.net> wrote:
>>>
>>> Inlet and outlet on the valve is 3/8 inch diameter. Stopper activated by the cable is 1/2 inch diameter. Pocket that it sits in is 5/8 diameter and has three standoffs to center the stopper in the hole. The stopper can move only 1/4 in and out so it stays in the pocket. The available space for water flow is 0.39 inches compared to 0.44 inches for the 3/8 inch internal diameter tubes on the valve. That is about a 25% reduction in flow assuming no pressure change.
>>> Not sure what the recommendation is
>>> to improve this situation using the existing parts but chime in if you have  the answer.
>>> PS The patient may have survived the operation.....to live on in another AH.
>>> P
>>>

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