hi Ed,

if you're talking about operating temps of the thermostat in the Subaru
engine, I'd think this link is the answer.. the thermostat opens sooner
than the coolant temp suggested by Dennis.
https://www.vancafe.com/21200AA072-p/21200aa072.htm

On Sun, Jun 28, 2020 at 8:25 AM Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> Typically 90C or 195F.
>
> Dennis
>
>
> From: Edward Barger <edvbarger@yahoo.com>
> Sent: Sunday, June 28, 2020 11:17 AM
> To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
> Cc: vanagon@gerry.vanagon.com
> Subject: Re: Coolant Hoses, Complete Set -- Remove and Replace
>
> Have been following this with much interest
>
> Do you know what operating tempr /  for stat  the  93 Subi engine I have
> in our van  ?
>
>
> thank ed
>
>
>
> Edward V Barger
> edvbarger@yahoo.com<mailto:edvbarger@yahoo.com>
> 310 922 6251
> “Age is an issue of mind over matter …
> If you don’t mind it doesn’t  matter "
> Mark Twain
>
>
>
>
>
> On Jun 28, 2020, at 8:13 AM, Dennis Haynes <d23haynes57@HOTMAIL.COM
> <mailto:d23haynes57@HOTMAIL.COM>> wrote:
>
> This is really a tough one to answer. There are reasons the factory chose
> the 87C, 188.7F. The 80C is 176F. Many vehicle runs even hotter, 205 is not
> uncommon. While heat is an enemy there are efficiencies to be gained at
> this temperature and many vehicles run even hotter. To me 176F is hot
> enough to burn off contaminants in the oil but it will make significant
> difference in heater performance. This also helps with oil temperature
> especially on the 2.1L with the heat exchanger. There is also the benefit
> of reduced piston temps and pre-ignition. The reality though is at elevated
> outside temps you wont be able to maintain this. With a lower temp radiator
> switch you can end up with the fan just running constantly or worse calling
> for high speed cutting off the AC. The other concern is that trying to stay
> lower you end up thermocycling the engine more frequently. A major goal to
> engine operation and longevity is consistency. Get it hot, let it expand,
> and keep it there. If you have a problem controlling temperature the lower
> stat will only delay the inevitable. Having the coolant cool while the
> pistons and oil are hot is a good way to scuff them.
>
> For the Waterboxer the weakness is oil temperature control. If you want to
> extend engine life that is where you begin.
>
> Dennis
>
>
> From: Dan N <dn92610@gmail.com<mailto:dn92610@gmail.com>>
> Sent: Saturday, June 27, 2020 7:14 PM
> To: Dennis Haynes <d23haynes57@hotmail.com<mailto:d23haynes57@hotmail.com
> >>
> Cc: Vanagon Mailing List <vanagon@gerry.vanagon.com<mailto:
> vanagon@gerry.vanagon.com>>
> Subject: Re: Coolant Hoses, Complete Set -- Remove and Replace
>
> thank you for the comments regarding the hole on the thermostat...
>
> now another question...
>
> are there any benefits (or pros and cons) regarding a 80°C thermostat vs.
> a 87°C thermostat for the water boxer?
>
> thanks
>
> dan
>
> On Sat, Jun 27, 2020 at 3:14 PM Dennis Haynes <d23haynes57@hotmail.com
> <mailto:d23haynes57@hotmail.com><mailto:d23haynes57@hotmail.com>> wrote:
> You are correct regarding engineering for many parts. Thermostats make
> things a bit different as the parts suppliers try to make parts fit as many
> applications as possible so often details are missed or added that
> shouldn't be. For Vanagon t-stats a very common mis step is the diameter of
> the lower disc. Thermostats catalogued by the main body diameter and
> temperature will often have the wron lower disc, as used in many other
> VW-Audi products. I just obtained some stats "Facet" brand. Box says made
> in Italy. These have the small hole with the bobble pin. The lower disc is
> also flat instead of the step. It is the correct diameter and height.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com<mailto:
> vanagon@gerry.vanagon.com><mailto:vanagon@gerry.vanagon.com>> On Behalf
> Of David McNeely
> Sent: Saturday, June 27, 2020 3:11 PM
> To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM><mailto:
> vanagon@GERRY.VANAGON.COM>
> Subject: Re: Coolant Hoses, Complete Set -- Remove and Replace
>
> I would think that if a thermostat has a hole, it was a part of the
> engineering for the cooling system or at least for the thermostat.  If it
> does not have a hole, same assumption.  In other words, I don't modify
> parts.  However, like you did, I check with experts (which does not include
> me).  mcneely
>
>