WingnutWick
Well Known Member
All,
A follow up post from my earlier post: http://www.vansairforce.com/community/showthread.php?t=159504
So after confirming with Dan H via photos, my original baffle seals were "the worst he's seen in a while" haha. So I completely re-did all of the seals, added a washer behind #3 ("washer trick"), and sealed off all the gaps in the baffling with Permatex. Furthermore I adjusted my dual P-Mgas to -1.4 Adv Shift and max advance to 36.
All this improved my CHT's by around 30+ degrees as now I am able to hold my hottest cylinders (#3, #4) around 400 at WOT, full rich, sea level on a slightly hot day. It's still a bit hotter than I imagine it should be but a heck of a lot better than skyrocketing back 430 instantly. I believe I will attempt the "baffle mod" in the near future to attempt to bring those down a little further.
I am still showing my #1 running pretty cool compared to the rest. For example at a normal cruising altitude at 2500 RPM pre lean I will see this: #1-344/1349, #2-372/1314, #3-383/1293, #4-312/1206. As I begin to lean #1 will peak out earlier than the rest at 1390. I will continue to lean to drive #1 LOP. #2 and #3 will peak out around 1410 and, with #1 showing about 30 LOP. Resulting lean from this has: #1 20 LOP, #2 50 ROP, #3 87 ROP, #4 110 ROP (with #4 never hitting peak). Any thoughts on these spreads? Normal?
Finally, cleaned gascolator wire screen (pretty clean) and crimped off a primer line that was no longer being used and broken - still seeing the low fuel pressures on WOP and full rich. Again no noticeable loss in power when this happens or significant change to EGT's though it is often accompanied with a large spike in FF momentarily and then as the FF's drop back down shortly thereafter the fuel PSI will rise a bit. Does this sound like air in the lines?
A follow up post from my earlier post: http://www.vansairforce.com/community/showthread.php?t=159504
So after confirming with Dan H via photos, my original baffle seals were "the worst he's seen in a while" haha. So I completely re-did all of the seals, added a washer behind #3 ("washer trick"), and sealed off all the gaps in the baffling with Permatex. Furthermore I adjusted my dual P-Mgas to -1.4 Adv Shift and max advance to 36.
All this improved my CHT's by around 30+ degrees as now I am able to hold my hottest cylinders (#3, #4) around 400 at WOT, full rich, sea level on a slightly hot day. It's still a bit hotter than I imagine it should be but a heck of a lot better than skyrocketing back 430 instantly. I believe I will attempt the "baffle mod" in the near future to attempt to bring those down a little further.
I am still showing my #1 running pretty cool compared to the rest. For example at a normal cruising altitude at 2500 RPM pre lean I will see this: #1-344/1349, #2-372/1314, #3-383/1293, #4-312/1206. As I begin to lean #1 will peak out earlier than the rest at 1390. I will continue to lean to drive #1 LOP. #2 and #3 will peak out around 1410 and, with #1 showing about 30 LOP. Resulting lean from this has: #1 20 LOP, #2 50 ROP, #3 87 ROP, #4 110 ROP (with #4 never hitting peak). Any thoughts on these spreads? Normal?
Finally, cleaned gascolator wire screen (pretty clean) and crimped off a primer line that was no longer being used and broken - still seeing the low fuel pressures on WOP and full rich. Again no noticeable loss in power when this happens or significant change to EGT's though it is often accompanied with a large spike in FF momentarily and then as the FF's drop back down shortly thereafter the fuel PSI will rise a bit. Does this sound like air in the lines?
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