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I don't know the answer, it would seem that either leaving the engine or
going into the engine (with the limits appropriately adjusted) would work
for both oil and coolant. It might be that those limits (oil after leaving
the cooler and coolant after leaving the engine) are simply a results of
where the temp sensors got placed on the engine during design phase. I don't
recall if the Mazda coolant temp gauge used the coolant sensor at the rear
housing or the thermostat. One was apparently used by the gauge and the
other one used by the ECU.
As best I recall, the old Racing Beat Technical Catalog specified that 180F
for the coolant leaving (of course the Mazda thermostat was set for 180F
which might have had something to do with that number) and 210F for the oil
flowing into the engines were the desired limits. However, I think that was
probably a bit conservative at least with the later engines with their
different castings. I have exceed those temps (as have most of us) without
any detectable adverse effect. But if you go past 230 on oil or around 220
on coolant for any extended period you may be pushing your luck.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message ----- From: "Steve Brooks" <steve@tsisp.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, May 23, 2004 8:27 AM
Subject: [FlyRotary] Re: water temp sender
Mark,
That's interesting. What are the acceptable temperatures for measuring at
those locations ? Also what temperatures are you seeing on yours ? I'm
not
sure what the reasoning is for measuring on at the coolest, and one at the
hottest points.
Steve
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of msteitle@mail.utexas.edu
Sent: Sunday, May 23, 2004 8:16 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: water temp sender
Steve,
I had the same question a while ago... I was told to measure the oil after
the
cooler (as it returns back to the engine), and measure the water on its
way
out
of the engine going to the radiator. So, my water temp sensor is on the
thermostat housing and the oil sensor is on the oil filter adapter.
Mark S.
Quoting Steve Brooks <steve@tsisp.com>:
> I now have another question. Since I found out that I'm measuring water
> temperature twice, and not measuring oil temperature at all, now I have
> another issue.
> I getting about a 20 degree difference between the two coolant temps.
>
> My coolant temp gauge sender is mounted in a port that was in the back
side
> of the water pump housing. As I recall, it's in the vicinity of the
> thermostat somewhere.
> The other temperature reading is from what I though was the oil
temperature
> port which is next to the oil pressure port, but turns out to be
coolant.
> If that is the right place to measure coolant, then I'm kind of happy
(not
> about being stupid about oil temp) that the coolant temperature is much
> lower than I previously thought.
>
> Also I wonder about why such a big difference ? The only thing that I
could
> think of is that one is on the outlet side of the radiator, and the
other
is
> on the hot side coming out of the engine before it goes to the radiator.
> Since I have no clue about where the coolant comes from that I'm
measuring
> next to the oil pressure sender, I really don't know.
>
> BTW My water temperature gauge is a VDO Vision series analog gauge, and
the
> oil temperature / pressure is a Aerospace logic digital display. The
Aero
> Logic is suppose to be accurate to within 1 degree, so I know that
> temperature is pretty accurate. The analog gauge really doesn't say
what
> its' accuracy is, so I guess that you can only ASSUME it's correct.
>
> So, where should I be measuring coolant temperature ?
>
> Steve Brooks
> Cozy MKIV N75CZ
> Turbo Rotary
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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