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Oil temp is not measured in the car, at least not in the 2nd gens. There
is an oil temperature switch in some cars, located in the pan, that activates
a start assist system that you fill with coolant. It only operates at very
low temperatures, so the switch has some sub-zero setting.
Finn Lassen wrote:
I have a strong feeling that these numbers (180 and 210) are with the
water temp sensor in the engine block (Steve's oil temp sensor) and entry
into the engine for oil. Actually I don't know where oil temp is measured
in the car (other than oil pan). My oil pan temps run as much as 20C higher
than into-engine-block temps.
I thought I had a picture of my oil temp sensor, but can't find it.
Like Todd's, but a single 3/4" plate, temp sensor mounted on top opposite
the input hole.
In other words, the oil under pressure sprays onto the bottom of the sensor
before the oil turns 180 degrees back into the engine.
Finn
Ed Anderson wrote:
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
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