BH1166
Well Known Member
For nearly a year, I have had a strange acting #4 EGT reading, that's repeatable on my 6A.
ENGINE
O320 DIA, FP prop, GRT EIS 4000, 1019TT, 467 SMOH (previous owner found corrosion on cam and had engine OH at 552hrs.) , Slick Mags, <100 hrs since OH, all SBs completed,
Slick Start, <100 hrs on TEMPEST plugs, 11 years on Slick harness, 11 yrs since new intake and exhaust gaskets.
Symptoms
After a normal engine start, warm up and mag check, Immediately after takeoff, #4 EGT is 200 degrees LOWER/COOLER than all others, spread alarm initiated.
HERE'S THE ODD thing.... I can reduce power by 100 RPM (2350 to 2250), and the EGT comes up within 5 seconds, in line with the others, and all is good. There is no roughness, or other symptoms than this.
The remainder of the flight EGTS are all ideal, responds appropriately to leaning, and at let down all respond as expected. I have verified my #4 is indeed #4, I have used a heat gun on all probe areas,
and get expected rise, in the same time span, per the EIS. Here is a picture in cruise....to me, these numbers are all pretty darn good. I am clueless what this is telling me, but dang tired of it happening
and no longer want to ignore. I have flown about 100 hours a year over the past 3 years of ownership.
ENGINE
O320 DIA, FP prop, GRT EIS 4000, 1019TT, 467 SMOH (previous owner found corrosion on cam and had engine OH at 552hrs.) , Slick Mags, <100 hrs since OH, all SBs completed,
Slick Start, <100 hrs on TEMPEST plugs, 11 years on Slick harness, 11 yrs since new intake and exhaust gaskets.
Symptoms
After a normal engine start, warm up and mag check, Immediately after takeoff, #4 EGT is 200 degrees LOWER/COOLER than all others, spread alarm initiated.
HERE'S THE ODD thing.... I can reduce power by 100 RPM (2350 to 2250), and the EGT comes up within 5 seconds, in line with the others, and all is good. There is no roughness, or other symptoms than this.
The remainder of the flight EGTS are all ideal, responds appropriately to leaning, and at let down all respond as expected. I have verified my #4 is indeed #4, I have used a heat gun on all probe areas,
and get expected rise, in the same time span, per the EIS. Here is a picture in cruise....to me, these numbers are all pretty darn good. I am clueless what this is telling me, but dang tired of it happening
and no longer want to ignore. I have flown about 100 hours a year over the past 3 years of ownership.