[Healeys] Thermostats

[Kees Oudesluijs]

OEM thermostats when fail they do so closed. With other thermostats it 
can be open, closed or in between. Anyway when a thermostat fails, which 
is not very often, you soon notice the result on the temperature gauge!!

Kees Oudesluijs



Op 13-9-2018 om 16:14 schreef Bob Spidell:
>
> One other consideration:  I have heard--note: hearsay--that the OEM 
> sleeved stats are of the 'fail closed' variety.  Have seen modern ones 
> called 'fail open' or, even 'failsafe.'
>
> FWIW.
>
> Bob
>
>
> On 9/11/2018 3:44 PM, Roger Grace wrote:
>> Steve,
>> Yes agree with your take on the 160 F thermostats. The only possible 
>> benefit is that if you start with a lower coolant temp, when you hit 
>> traffic, it will take longer before the dreaded over temp zone is 
>> approached.
>> As an aside, I have installed an oil temp gauge; very useful and a 
>> reminder just how long the engine (not coolant) takes to get up to 
>> temp. Trying to get in the habit of not going over 2000 RPM till OT 
>> is about 120F – often another 15-20 mins after the thermostat opens.
>> rg
>> *From:* BJ8Healeys
>> *Sent:* Monday, September 10, 2018 12:44 PM
>> *To:* 'healeys'
>> *Subject:* Re: [Healeys] Thermostats
>>
>> Fred, I personally believe a 160-deg. F thermostat used in an effort 
>> to "cool down" a Healey is useless.  A thermostat responds only to 
>> the temperature of the coolant flowing through it by opening up to 
>> increase coolant flow, and once it is open all the way at 160+, it is 
>> out of the loop and can't open further to cool more.  I am on the NC 
>> coast where winters are mild.  I once tried a 160 (non-sleeved) 
>> because I had one that someone gave me.  My BJ8 ran so cold that 
>> winter that I actually had to block part of the radiator to raise it 
>> to anywhere near normal.  Up there in the NC mountains, that would be 
>> even more of a problem for you.
>>
>> I use a 187 F (86 C) New Old Stock AC sleeved thermostat (AC part 
>> number 1572320) that I was able to score from lister Kees 
>> Oudesluijs.  I installed it along with an upgraded core in the 
>> radiator at the same time, so I can't really say how much improvement 
>> the thermostat alone did; but since the modification my car runs 
>> consistently at 170 - 180 in the hot summers of the NC coast, except 
>> when in stop-and-go traffic when it might make it to 190 or a bit 
>> above.  In winter, it runs at 160 - 170.  I can see the sleeve 
>> operate as the car warms up because the gauge will cycle between 160 
>> and 190 until coolant temperature stabilizes.  That can take up to 50 
>> miles.
>>
>> A friend placed an order later with Kees for several of the 190 F 
>> sleeved thermostats.  I got one of those as a spare.  Don't know if 
>> he has any left, or can get more.  As far as I know, the only sleeved 
>> thermostats available from the usual suspects are 160s and I wouldn't 
>> waste my money on them.
>>
>> I just Googled the AC part number and came up with this source:
>>
>> *https://tinyurl.com/y9c6n53h*
>>
>> Unfortunately, it does not post to the USA (but on the bright side, 
>> it offers free shipping!). Maybe you could work out a deal with a UK 
>> lister to buy one for you and ship it to you.  £19.99 = $26.04
>>
>> Steve Byers
>>
>> HBJ8L/36666
>>
>> BJ8 Registry
>>
>> AHCA Delegate at Large
>>
>> Havelock, NC
>>
>>
>
>
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