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Brilliant Bob. I concur. The key is delay between power applied and coolant
pressure change. Very little delay. That's either compression gasses leaking
into coolant or local boiling. What diameter coolant hoses you running? I've
seen similar results when a guy installed 3/4" diam hoses. He increased to 1"
diameter and all of the symptoms disappeared. He was able to aggravate the
problem by using Evans coolant...further flow restriction (thicker fluid) caused
temps to skyrocket.
Excellent job of gathering facts.
My guess is that you may be experiencing
nucleate boiling in the area of the C C thermal pick up. The generation
of steam bubbles would tend to insulate the wall of the housing. All
other indications indicate that there is heat being generated and dissipated
into the coolant. It looks like if you had continued with the 17. 5 GPH
fuel flow and the same RPM that the difference in the two temps would continue
to be spread, until power was reduced.
Looking at the water press. it looks like
it was increasing in press. at about the same rate as the rad
temp, peeking at 25 PSI. This translates to about 240 deg F.(sorry
Dave my steam table is ceria 1957) I don't think there is any direct
relationship between the rad outlet temp. and the C C temp.(This is only a
guess, because there is no Holiday Inn express close by, and I am not sleeping
much these days anyway)
Bob Perkinson
Hendersonville, TN.
RV9 N658RP Reserved
If nothing
changes
Nothing changes
The real mystery is the comparisons between rad inlet temp, rad outlet
temp and C.C. coolant temp (coolant temp measured right after passing
both rotor combustion chambers). In a 2nd gen 13B the CC coolant
temp is the hottest coolant in the engine because it normally cools slightly
after passing through the cooler intake port side of the engine. This
is the rad inlet temperature. As you can see, the CC temp and rad
inlet temp start out the same. When the power is increased, the rad
inlet temp climbs faster and higher than CC in the Renesis. I assume
this is caused by the increased heat picked up from the longer exhaust
ports. It is the amount that surprises me. Study the temp
differentials between these three temps and see if you can see the mystery
and make sense of this.
The Chart is pretty crowded even after I eliminated several parameters
for this jpeg but when viewing it in Excel, it is very easy to see and
identify all the data. Moving the mouse pointer to any point of any
parameter pops up a little tag showing what the item is and the exact
digital value at that point in time.
Tracy
-al wick
Cozy IV powered by Turbo Subaru
3.0R with variable valve lift and cam timing.
Artificial intelligence in
cockpit, N9032U 240+ hours from Portland, Oregon
Prop construct, Subaru
install, Risk assessment, Glass panel design
info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
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