arizona baffle
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- blsewardjr
- 4 Diamonds Member
- Posts: 485
- Joined: Tue Jul 26, 2011 11:19 pm
- First Name: Bernie
- Aircraft Type: DA40
- Aircraft Registration: N377DS
- Airports: KCHO
- Has thanked: 118 times
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Re: arizona baffle
My DA40 has had a hotter #1 cylinder (anywhere from 10-30 degrees from the next hottest) for years. I recently put on a new #1 cylinder and the problem, if anything, gotten worse. (The new cylinder has 45 hours on it and the temp is 20-30 degrees hotter than the next hottest cylinder across a range of fuel flows ROP to LOP at 65%). If the #1 temp was within a good temp range I might not care, but it now runs 405-420 on climb out and 400+ at book ROP settings for 65% and 75%. (LOP it runs cool enough, 370-380, but I'd like to be able to go fast if desired.) I've tried everything I've seen on this forum (Arizona baffle, sealing up all holes, addressing the waves in the top flexible baffles, tightening the baffles to cylinders, mag timing, PowerFlow, fine wire plugs, GAMIs, etc.) It seems to me that the only thing left is to try cutting down the interior part of the Arizona baffle that partially covers the #1 cylinder, which is visible in Steve's post above. My IA discussed it with Diamond, who said that it might help but would increase the #3 CHT. That would be ok because it's the coldest cylinder. He's a little reluctant to do it and asked me to run it by you guys. I was wondering if anyone else has done it or has any other ideas. If so, that might help persuade. Thanks. Bernie
Bernie Seward, IR, AGI
2003 DA40 N377DS
KCHO Charlottesville, VA
2003 DA40 N377DS
KCHO Charlottesville, VA
- Rich
- 5 Diamonds Member
- Posts: 4592
- Joined: Mon Aug 30, 2010 12:40 pm
- First Name: Rich
- Aircraft Type: DA40
- Aircraft Registration: N40XE
- Airports: S39 Prineville OR
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Re: arizona baffle
One thing you might check is something I found with my #3 cylinder after installing the Surefly. The scat tubing that leads back to the battery had become routed below that cylinder head, impeding airflow in the area where the CHT probe is located. My #3 CHTs were nibbling at 400 deg in cruise. I did some finagling to keep the tubing away from the cylinder head and voila! back to normal. You might check for some similar obstruction below #1. #3 has been and still is my hottest cylinder, but not by much. My coldest cylinder has long been #4, and the overall pattern of CHTs follows EGTs.blsewardjr wrote: ↑Tue Mar 24, 2020 9:12 pm My DA40 has had a hotter #1 cylinder (anywhere from 10-30 degrees from the next hottest) for years. I recently put on a new #1 cylinder and the problem, if anything, gotten worse. (The new cylinder has 45 hours on it and the temp is 20-30 degrees hotter than the next hottest cylinder across a range of fuel flows ROP to LOP at 65%). If the #1 temp was within a good temp range I might not care, but it now runs 405-420 on climb out and 400+ at book ROP settings for 65% and 75%. (LOP it runs cool enough, 370-380, but I'd like to be able to go fast if desired.) I've tried everything I've seen on this forum (Arizona baffle, sealing up all holes, addressing the waves in the top flexible baffles, tightening the baffles to cylinders, mag timing, PowerFlow, fine wire plugs, GAMIs, etc.) It seems to me that the only thing left is to try cutting down the interior part of the Arizona baffle that partially covers the #1 cylinder, which is visible in Steve's post above. My IA discussed it with Diamond, who said that it might help but would increase the #3 CHT. That would be ok because it's the coldest cylinder. He's a little reluctant to do it and asked me to run it by you guys. I was wondering if anyone else has done it or has any other ideas. If so, that might help persuade. Thanks. Bernie
2002 DA40-180: MT, PowerFlow, 530W/430W, KAP140, ext. baggage, 1090 ES out, 2646 MTOW, 40gal., Surefly, Flightstream 210, Orion 600 LED, XeVision, Aspen E5
- Rich
- 5 Diamonds Member
- Posts: 4592
- Joined: Mon Aug 30, 2010 12:40 pm
- First Name: Rich
- Aircraft Type: DA40
- Aircraft Registration: N40XE
- Airports: S39 Prineville OR
- Has thanked: 145 times
- Been thanked: 1180 times
Re: arizona baffle
I incorrectly said “#4 CHT”. In fact it was #3 CHT that was a problem. #3 is on the right side, whereas #4 is on the left.
2002 DA40-180: MT, PowerFlow, 530W/430W, KAP140, ext. baggage, 1090 ES out, 2646 MTOW, 40gal., Surefly, Flightstream 210, Orion 600 LED, XeVision, Aspen E5