Ed,
That's interesting.  I'm seeing the exact opposite.  The temperature from
the rear housing is about 20 degrees cooler than that from the water pump.
Could it be because of your plugs up installation the sensor on the rear
housing is at the top of the engine, i.e. heat rises, hottest spot ?  My
water pump is at the top of the engine...maybe hottest spot.  With a 20
degree difference, I want to make sure that I'm measuring at the right
point.

Steve

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Ed Anderson
Sent: Sunday, May 23, 2004 7:54 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: water temp sender


Steve, I have found the coolant sensor on the rear housing to also measure
higher temperatures.  My normal coolant sensor is at the thermostat and

would think that would be measuring the hottest part of the coolant (after
its made a trip from the pump to the rear housing and back to the

opening), but when I connected a temp gauge to the rear sensor it measured
hotter.  Perhaps because it is on the side of the engine where the spark
plugs are (and the metal nearest the spark plugs gets the hottest) but as

joins the rest of the coolant flow back to the thermostat its peak temp
lowers somewhat as it distributes it to the rest of the flow.  Just a

of course.

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 7:43 AM
Subject: [FlyRotary] water temp sender


> 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

> If that is the right place to measure coolant, then I'm kind of happy

> 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

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

> 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

> 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

> 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
>



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