Received-SPF: error
 receiver=logan.com; client-ip=65.23.108.44; envelope-from=steve@tsisp.com
Reply-To: <steve@tsisp.com>
From: "Steve Brooks" <steve@tsisp.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: New Scoop 
Date: Wed, 14 Jul 2004 12:03:37 -0400
Message-ID: <029f01c469bc$2068be40$6400a8c0@WORKGROUP.local>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
In-Reply-To: <list-320497@logan.com>
Importance: Normal

John,

> Before that, the temps would climb up, what I think is too high,
especially the oil.
That's part of the point. Maybe you're expecting temps to be lower than they
need to be. Also - how accurately is you're gauge calibrated? (I calibrated
mine with hot wax, but I'm still not sure I really trust it within 10
degrees or so.) I'm looking forward to getting my EM2, then I'll know better
whats going on. So far though, I think I'm within acceptible limits - I'm
not loosing any coolant and the engine keeps on running :)

First let me say that my oil temperature is a digital display from Aerospace
Logic.  Its' accuracy is +/- 1/2 degree, but would depend on the sensor.
Sensor is Westach made for aviation.  Coolant is a VDO gauge and sensor.  I
didn't verify accuracy of either one.

I went to the airport this morning to fit the new scoop, and since the
visibility was pretty good, I decided to take the plane up since I hadn't
flown it since I put all off the mods back that gave me fairly decent
results.  The OAT was 80F, and I took off from GRD elevation 600 MSL -
density alt was already 2200'  I climbed to 2200 MSL  with 5lbs of boost
(5300 RPM), leveled off, and pulled the throttle back to zero boost (4600
RPM).  Oil 190 and rising, coolant 200 and rising.  Oil stabilized at 217F
and coolant went up to 225 after about 2 minutes or so.  That's the highest
coolant temperature that I've seen in a long while.  Throttled back to -10
boost (4200 RPM), and temperatures stabilized at 215 Oil and 200 coolant.

I throttle up a little bit to about -5 boost, and oil temp up to 217 coolant
about the same.  Cruised at that throttle setting for about 5 minutes.
Everything pretty steady.  Speed only about 120 kts.  Didn't retract the
nose gear.

When I throttled down to descend and land, the oil was 180 and coolant also
about 180.  My temperature gauges seem to be tied to the throttle, which
tells me that I've not got sufficient cooling.

Last time I flew I was getting a stabalized 205/210 in the climb
(coolant/oil). When I leveled off at 5000 it settled down to 185. At 11000
it was lower until I opened the throttle, then it stabalized at 185.

I'd be happy with those temps.  I don't know what is different between the
tow set ups.  My coolant sensor is in the water pump housing, and it has a
pretty long probe on it, so I have no doubt that it's in the coolant stream.
This point is just before the coolant goes to the radiator, so it is at the
hottest point. My oil sensor is in the top of the remote oil filter, mounted
to the PSRU mounting plate.  I drilled and tapped a hole directly above the
tube that the filter screws onto.  This probe isn't very long, but I tapped
it in as far as possible, and I ASSUME that it's in the oil flow.  The oil
filter is after the oil cooler, and just before the oil re-enters the
engine, so it should be at the coolest point.

Your oil coolers are set up differently.  I'm using one of the 2nd gen,
where you are using 2 smaller ones.  Your coolers sit in the side of the
plenum, where mine sits end-to-end with the radiator.  The oil cooler is
closest to the scoop, so should be getting more air.


> I am curious about what your temperatures are running.  What do you see in
> climb ? and what do you see in cruise ?
Climb - 205/200, 1400 EGT, 100kts, 1000fpm on a 90F day.
Cruise - 185/190, 1300 EGT, 178kts, 5150 rpm, 38 MAP 11,000 ft.

Again, these temps looks very good to me.

I'd be interested in other perspectives on this one.
Me too.


Steve Brooks