[Healeys] Thermostats

[i erbs]

I had a nos sleeved Stat snd it failed just about closed.  Caused
overheating. Been using a non sleeved one with no issues.

Ira Erbs
Portland, OR
typos and artifacts are the fault of my phone

On Thu, Sep 13, 2018, 3:42 PM Bob Spidell <bspidell at comcast.net> wrote:

> 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 <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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