Bill,

“I have the Renesis.  I expected that the EGT from the side port exhausts would be cooler than the PP exhausts on the 13B and 20B?  I think I expected about 13-1400 degrees with the difference going into the coolant”

My EGT’s usually run between 1400 at 1600F. If EGT temps are higher then I would look for an exhaust restriction. Pettit Racing claims they have identified housing damage from exhaust restriction caused by turbo’s and higher EGT’s. If true, a restricted exhaust may cause the same problem. High exhaust temps are not good for the coolant o’rings.

“Good idea but I am not certain how difficult it would be to squeeze that heater hose shut.  It is pretty stiff.  I could probably reduce the flow, but I would be concerned about damage if I squeezed it completely shut”

Bruce T. recommended not removing the press fit hose adapter to install a fitting. He recommended squeezing the end shut and welding it closed if not in use. Apparently removing the adapter can damage the housing. I’m using an exhaust heat exchanger for cabin heat and it works well. It doubles has a heat shield for my oil pan. It’s also much lighter. I did add a carbon monoxide detector.  I did a test flight a couple of weeks back to 17,500 ft. OAT was 0 F and it was comfortable in a long sleeve T shirt. At 17,500 I had 20” MP and could still climb at 300 fpm.

Bobby

N416AS__ Offically in Phase 2.

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Thursday, March 03, 2011 10:32 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Coolant routing

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy
Sent: Thursday, March 03, 2011 9:09 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Coolant routing

On Thu, Mar 3, 2011 at 8:59 AM, Bill Bradburry <bbradburry@bellsouth.net> wrote:

I have a heater hose connected from the stock outlet from the rear iron and
the other end of the hose is connected to the inlet to the water pump
housing.  I don't currently have a heat exchanger in this hose nor do I have
a valve to shut off the flow of water.  I assume that it is flowing full
bore any time the engine is running.  5/8 inch hose.  Naturally this water
is bypassing the hot side of the engine as well as the radiator.
I would like some opinions as to what effect this might have on my cooling
temperatures.  Has anyone done this, then installed a valve to shut off the
flow and seen the effect?
I have a valve, but didn't want to put it in till I design the rest of the
heater system.
What say ye?

Yesterday morning, OAT about 70, water temp about 170 when I took the
active, climbed to about 205 getting to pattern altitude, then cooled to
about 199 as I went around the pattern.  I left of a little sightseeing trip
got up to 2500 (low clouds) flew over the house, (the wife heard me coming
and ran outside..so much for thinking it was quiet!  She said it sounds like
an airplane on steroids. I take that as a complement)

The temp seemed pretty stable around 200, but it did climb to 210 one time
for a short period for no reason that I could figure then came back down.
EGT I thought was pretty high, around 1600.  Mixture about two bars above
the midpoint.

Bill B


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