[Healeys] Thermostats

Mon Sep 17 11:36:35 MDT 2018

Not really, you can have the radiator cap as a seal only and have the 
cap on the overflow radiator as a pressure cap, or have the usual 
radiator cap with pressure valve and return valve. But you have to make 
sure the seal is airtight, so the caps with a SS or brass disc as seal 
will have to be fitted with a thin but stiff rubber ring.

Kees Oudesluijs

Op 17-9-2018 om 18:18 schreef David Nock BCS:
> Only if you have the correct style radiator cap that is sealed on the top
> David Nock
> British Car Specialists
> 209-948-8767
> www.britishcarspecialists.com
> *From:* Kees Oudesluijs <mailto:coudesluijs at chello.nl>
> *Sent:* Monday, September 17, 2018 9:07 AM
> *To:* David Nock BCS <mailto:healeydoc at sbcglobal.net> ; 
> healeys at autox.team.net <mailto:healeys at autox.team.net>
> *Subject:* Re: [Healeys] Thermostats
>
> An overflow reservoir will see to that. After the engine has cooled 
> down the expelled coolant will be sucked back into the rad.
>
> Kees Oudesluijs
>
> Op 17-9-2018 om 18:00 schreef David Nock BCS:
>> The main purpose of putting a higher pressure cap is to stop the 
>> continues loss of coolant after shutting the engine down and the 
>> engine temp going up over the 212 point.  By putting a 10 or 13 max 
>> pressure cap you have raised the boiling point 10 to 20 degrees thus 
>> stopping the coolant loss.
>> It wont do anything for the overheating.
>> On your newer cars today they need a much higher pressure cap because 
>> the run the engine temp much higher to reduce emissions. I have seen 
>> some new Jaguars and Land Rovers that are running a 25 lb cap. As 
>> well as cooling systems that you can not fill up correctly with out 
>> using a vacuum type filler. Due to the fact that there will be air 
>> pockets in the cooling system that you can not remove any other way.
>> David Nock
>> British Car Specialists
>> 209-948-8767
>> www.britishcarspecialists.com <http://www.britishcarspecialists.com>
>> *From:* Kees Oudesluijs <mailto:coudesluijs at chello.nl>
>> *Sent:* Monday, September 17, 2018 7:53 AM
>> *To:* healeys at autox.team.net <mailto:healeys at autox.team.net>
>> *Subject:* Re: [Healeys] Thermostats
>>
>> 7 Psi should be more than enough on these old engines. Water pump 
>> seal may fail (as mentioned), so may the hoses and the original style 
>> radiator if you operate under a higher pressure. Modern cars can take 
>> much higher pressures of  20Psi or more. If your cooling system is up 
>> to scratch there should not be a problem. i.e. clean system, radiator 
>> with enough capacity, thermostatically controlled electric fan to 
>> keep things under control in dense traffic and hot weather. The 
>> electric fan may not be original but when these cars were new traffic 
>> conditions were not as demanding as in these days. It just keeps you 
>> out of trouble at very little costs and a bit of ingenuity (breakers 
>> yard).
>>
>> Kees Oudesluijs
>>
>> Op 17-9-2018 om 14:14 schreef Michael Salter:
>>> Also, with respect to cooling system pressure, the water pump seal 
>>> in the 6 cylinder engines typically won't handle much over 10 p.s.i.. M
>>> ------------------------------------------------------------------------
>>> *From:* Healeys mailto:healeys-bounces at autox.team.net on behalf of 
>>> David Nock mailto:healeydoc at gmail.com
>>> *Sent:* Sunday, September 16, 2018 11:16:50 PM
>>> *To:* Linwood Rose
>>> *Cc:* Forum Healeys
>>> *Subject:* Re: [Healeys] Thermostats
>>> If you are using the alloy radiator you have a short neck cap. 
>>> Depending on the press’s app you are using you can not use a bellows 
>>> type thermostat. Because the bellows will collapse if you use 
>>> anything over 7 lbs. Then the thermostat will close and the engine 
>>> will overheat.
>>>
>>> Sent from my iPhone
>>>
>>> On Sep 16, 2018, at 7:19 AM, Linwood Rose <linwoodrose at mac.com 
>>> <mailto:linwoodrose at mac.com>> wrote:
>>>
>>>> I would like to go back to Steve Byers’ comment. I am not so much 
>>>> concerned about my car overheating. When the engine was rebuilt it 
>>>> was thoroughly cleaned to get rid of all sludge. I run an aluminum 
>>>> radiator, have built and installed air ducting for improved flow. I 
>>>> do not have an electric fan.
>>>> My problem was that my engine ran cool and would take quite a while 
>>>> to “warm up.” I think I was using a 165 degree (or thereabouts) 
>>>> non-sleeved thermostat. Robert Shaw as I recall. So I wanted to get 
>>>> my engine up to 185-190 degrees sooner. I went with one of the same 
>>>> AC sleeved thermostats 82 degrees centigrade from Kees that Steve 
>>>> used. The engine seems to be much happier and gets to running temp 
>>>> more quickly.
>>>> At least for my engine, a 160-165 degree thermostat keeps things 
>>>> cool too long. In a perfect world I would prefer David Nock’s 
>>>> bellows thermostat but with a 185-190 degree opening. Since that 
>>>> doesn’t seem to be available I think I will stick with the AC unit 
>>>> and keep my eye on the temp. Gauge.
>>>> I am no authority on this. I am simply passing along my experience. 
>>>> Am I understanding all of this correctly?
>>>> Thanks,
>>>> Lin
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Sep 15, 2018, at 9:30 PM, Rossm <rvmaylor at shaw.ca 
>>>> <mailto:rvmaylor at shaw.ca>> wrote:
>>>>
>>>>> To be fair Michael, it is hot maybe three days a year in Canada?:) 
>>>>> .  I left Calgary yesterday for the Rendezvous and it was snowing 
>>>>> already. First time the hood contraption on the BN6 has been up 
>>>>> since last September.
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Sep 15, 2018, at 10:50, Michael Salter 
>>>>> <michael.salter at gmail.com <mailto:michael.salter at gmail.com>> wrote:
>>>>>
>>>>>> Well I have watched this discussion on sleeved thermostats for 
>>>>>> the last week but now I just have to say. When the sleeved 
>>>>>> thermostats went NLA, about 45 years ago, we resorted to 
>>>>>> installing just plain old Stant 175 degree stats and guess what 
>>>>>> ... not one complaint or comment on running hotter or overheating 
>>>>>> and absolutely no sign of any symptoms of overheating on my own 
>>>>>> BJ8 even in the hottest of ambient temperatures. It just didn't 
>>>>>> happen!!! Just sayin'. M
>>>>>> ------------------------------------------------------------------------
>>>>>> *From:* Healeys <healeys-bounces at autox.team.net 
>>>>>> <mailto:healeys-bounces at autox.team.net>> on behalf of Rossm 
>>>>>> <rvmaylor at shaw.ca <mailto:rvmaylor at shaw.ca>>
>>>>>> *Sent:* Saturday, September 15, 2018 10:35:32 AM
>>>>>> *To:* Forum Healeys
>>>>>> *Subject:* [Healeys] Thermostats
>>>>>> Three sleeved thermostats, one on the right 160 degrees, middle 
>>>>>> no idea,  left is a Smiths x85002s/86 (180F) and has failed open.
>>>>>>
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