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1. 07:00 PM - EGT concerns resolved (Larry McFarland)
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| Subject: | EGT concerns resolved |
--> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
Hi Stratus guys,
I ran a rough test this afternoon that shows positive results of recommendations
found in the
archives and by people of our group. Thank you all for that. I had EGTs in the
area of 1550-degrees F at 5100-rpm. It was recommended standard 162 be replaced
with 170 main jets and the circlip be lowered one notch on the mid-range
needle. That seems to have taken care of EGT concerns. This blustery low-overcast
morning run up proved EGTs were stabilized as 2500-rpm yielded 1225-degrees
F and 3000 rpm hit 1260-degrees F. CHT temps did hit 230 after progressively
raising the rpm every 3-minutes. Because the prop's now set to a 14-degree
pitch, the test was repeated this afternoon and a written record was made of
the results with the cowl on. N601EZ was started on the ramp with the clipboard
in the right seat and my feet firmly on the brakes. The preliminary check of
engine function was followed by a progressive warm-up that went like this.
--------------------------(With an ambient temp of 68-degrees F.) ---------------------
----------------warm-up -----RPM -----CHT ---------EGT -------Coolant ------Oil
Temp
----------------6 minutes -@- 1000 ---123-156 ----846-1080 -------74 ------------89
----------------3 minutes -@- 1500 ---185-200 ----1100-1190 -----128 ----------114
----------------3 minutes -@- 2000 ---205-210 ----1200-1214 ---171-178 -----128-142
----------------3 minutes -@- 2500 ---213-215 ----1215-1235 ---180-181 -----153-155
----------------3 minutes -@- 3000 ---225-230 ----1257-1260 ---182-183 -----161-169
---------------18 min total running time and was halted before doing 3500 rpm.----------The
test data isn't probably as linear as to provide a great graph, because
I was filling in data line by line from the EIS, watching the clock, and
adjusting the throttle, but the issue now moves from EGT back to Cylinder Head
Temps and to find out if adequate cooling will be added by airflow at the radiator
in flight. The test suggested there's probably enough time to get to pattern
altitude and well above the runways to find out.
Any other opinions out there?
Thanks again,
Larry McFarland 601HDS-Stratus w/Ram Heads
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