[DeTomaso] Interesting Robertshaw 333-180 thermostat design change

Sun Nov 17 11:09:31 EST 2019

I have some of the original Robert Shaw 351C thermostats.  I bought 10
several years ago, and I still have some left.

Free to a good home, first come, first served.

I will be in the garage today.  I will post later today what I have.

On 11/17/19, 8:24 AM, "DeTomaso on behalf of Rich Hoppe"
<detomaso-bounces at server.detomasolist.com on behalf of
richbhoppe at gmail.com> wrote:

>I put one of these in my daughters car.  I think it is well made better
>than robertshaw.
>
>Sent from my iPhone
>
>> On Nov 17, 2019, at 4:04 AM, Thomas Tornblom <thomas at hax.se> wrote:
>> 
>> Here is the Tim Meyer thermostat:
>> 
>> https://www.tmeyerinc.com/product/high-flo-thermostat/
>> 
>> Looks OK.
>> 
>> Thomas
>> 
>>> Den 2019-11-17 kl. 09:08, skrev Mike Drew:
>>> This new one is Robertshaw Flowkooler, 333-180, purchased last week
>>>from Summit.
>>> Mine is a Robertshaw/Flowkooler 333-180, purchased several years ago
>>>from Summit....
>>> Mike
>>> Sent from my iPad
>>>>> On Nov 16, 2019, at 22:48, Thomas Törnblom <thomas at hax.se> wrote:
>>>> 
>>>> Is this from Robertshaw or Tim Meyer? I believe Tim Meyer has tooled
>>>>up to make the original design.
>>>> 
>>>> Thomas
>>>> 
>>>>> 17 nov. 2019 kl. 05:03 skrev Mike Drew via DeTomaso
>>>>><detomaso at server.detomasolist.com>:
>>>>> 
>>>>> All,
>>>>> 
>>>>> The Robertshaw 333-180 is the ultimate thermostat for the 351C—or at
>>>>>least it used to be.
>>>>> 
>>>>> There has been an undocumented design change with the same part
>>>>>number. Now, instead of supplying a thermostat with the 351C ‘hat’
>>>>>which partially (but not fully) blocks off the orifice in the center
>>>>>of a disc pressed into the block, instead they are supplying a
>>>>>conventional Windsor thermostat (ordinarily bad news) along with a
>>>>>replacement disc with a smaller (too-small) orifice. In order to use
>>>>>this thermostat the stock disc needs to be removed from the block and
>>>>>replaced with this new one. That then means that going forward only
>>>>>NON-Cleveland thermostats can be used. If a proper 351C thermostat is
>>>>>installed, it will be prevented from fully opening because the hat
>>>>>will strike the now-too-small disc.
>>>>> 
>>>>> With this new setup, when the thermostat opens it will fully block
>>>>>off the orifice. However, the engine is supposed to have at least
>>>>>some water circulating past the disc, with an area equivalent to that
>>>>>of of a 5/16ths bypass hose as used in other Ford engines. (If you
>>>>>compare the size of the stock ‘hat’ with the hole in the stock disc,
>>>>>you will see the hole is measurably larger). If I was to use this new
>>>>>setup, I would therefore be inclined to modify the disc, either by
>>>>>drilling bypass holes or (preferably) enlarging the center hole.
>>>>> 
>>>>> Too, the stock setup allows for some misalignment between thermostat
>>>>>and disc. If the thermostat wasn’t perfectly centered, it would still
>>>>>have room to fully open. With this new deal, if things aren’t
>>>>>perfectly aligned, it might not fully open, or worse, it might open
>>>>>and get stuck open, leading to very slow warmup problems.
>>>>> 
>>>>> Here is a pic of a ‘real’ Robertshaw 333-180 compared to the new one:
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> <image1.jpeg>
>>>>> 
>>>>> 
>>>>> Here is the new one with its included disc:
>>>>> 
>>>>> 
>>>>> 
>>>>> !DSPAM:5dd0c6a64479872232500!
>>>>> <image2.jpeg>
>>>>> 
>>>>> 
>>>>> And the disc laid over the thermostat:
>>>>> 
>>>>> 
>>>>> 
>>>>> !DSPAM:5dd0c6a64479872232500!
>>>>> <image3.jpeg>
>>>>> 
>>>>> 
>>>>> I’m sorry I don’t have a stock disc handy to compare, and show the
>>>>>clearance between the orifice and the hat. You will just have to take
>>>>>my word for it....
>>>>> 
>>>>> Mike (hoarding his one remaining good thermostat!)
>>>>> 
>>>>> Sent from my iPad
>>>>> 
>>>>> !DSPAM:5dd0c6a64479872232500!
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>> 
>> -- 
>> Real life:   Thomas Törnblom             Email:    thomas at hax.se
>> Snail mail:  Banvallsvägen 14            Phone:    +46 18 32 31 18
>>             S - 754 40 Uppsala, Sweden  Mobile:   +46 76 209 8320
>> _______________________________________________
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