---------------------------------------------------------- Stratus-List Digest Archive --- Total Messages Posted Thu 02/23/06: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:01 PM - Bings and EGTs (LarryMcFarland) 2. 02:06 PM - Re: Bings and EGTs (Hinde, Frank George (Corvallis)) 3. 03:01 PM - Re: Bings and EGTs (LarryMcFarland) 4. 05:26 PM - Re: Bings and EGTs (Don Walker) 5. 06:15 PM - Re: Bings and EGTs (LarryMcFarland) 6. 06:57 PM - Re: Bings and EGTs (Don Walker) ________________________________ Message 1 _____________________________________ Time: 01:01:35 PM PST US From: LarryMcFarland Subject: Stratus-List: Bings and EGTs --> Stratus-List message posted by: LarryMcFarland Hi guys, I went flying yesterday and noticed something that was interesting for those of us with Bing carbs. The EGTs climbed to their normal 1420 at high climb 4800 rpm and the higher I got (4500 ft), the more the EGTs drifted lower. It eventually permitted a high rpm without going above the 1400 deg f. Nice for a good cross-country cruise, but as I descended to land, EGTs climbed back up to set limits on my EIS and the rpms had to be reduced to keep the EGTs at or below limits. Not something I'm worried about, but it seemed strange to see EGTs behind the curve while descending. On final everything was well below limits, but I was wondering about the altitude compensating carbs and if they ever get out of whack or is this normal. Does this square with anyone else's experience? Larry McFarland - 601HDS at 85 hours and still testing. ________________________________ Message 2 _____________________________________ Time: 02:06:19 PM PST US Subject: RE: Stratus-List: Bings and EGTs From: "Hinde, Frank George (Corvallis)" --> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" Hmm, Can't say I have noticed this Larry, probably because I have never looked at the EGT guage except to wonder how a valve could stand all that heat...:) Frank Do not archive -----Original Message----- From: owner-stratus-list-server@matronics.com [mailto:owner-stratus-list-server@matronics.com] On Behalf Of LarryMcFarland Sent: Thursday, February 23, 2006 1:01 PM Subject: Stratus-List: Bings and EGTs --> Stratus-List message posted by: LarryMcFarland --> Hi guys, I went flying yesterday and noticed something that was interesting for those of us with Bing carbs. The EGTs climbed to their normal 1420 at high climb 4800 rpm and the higher I got (4500 ft), the more the EGTs drifted lower. It eventually permitted a high rpm without going above the 1400 deg f. Nice for a good cross-country cruise, but as I descended to land, EGTs climbed back up to set limits on my EIS and the rpms had to be reduced to keep the EGTs at or below limits. Not something I'm worried about, but it seemed strange to see EGTs behind the curve while descending. On final everything was well below limits, but I was wondering about the altitude compensating carbs and if they ever get out of whack or is this normal. Does this square with anyone else's experience? Larry McFarland - 601HDS at 85 hours and still testing. ________________________________ Message 3 _____________________________________ Time: 03:01:04 PM PST US From: LarryMcFarland Subject: Re: Stratus-List: Bings and EGTs --> Stratus-List message posted by: LarryMcFarland Frank, The cylinder head temps never get above 195, so I doubt the EGTs are a problem at 1450 (my set limit). The aluminum heads at the exhaust are what I'd be worried about, but those temps have been o.k. I can fly wide open at 4500 feet or so and hold 130 mph, but it seems weird to watch the EGTs climb from below 1400 as I was letting off and descending. I can't figure out why. Ambient temps were in the high 30s, really cool clear air. It would seem the carbs are still richer at altitude and become lean during descent. This would seem to be a reverse of what I'd expect. Larry do not archive Hinde, Frank George (Corvallis) wrote: >--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" > >Hmm, Can't say I have noticed this Larry, probably because I have never >looked at the EGT guage except to wonder how a valve could stand all >that heat...:) > >Frank > >Do not archive > > >Subject: Stratus-List: Bings and EGTs > >--> Stratus-List message posted by: LarryMcFarland >--> > > EGTs climbed back up to set limits on my EIS and the >rpms had to be reduced to keep the EGTs at or below limits. Not >something I'm worried about, but it seemed strange to see EGTs behind >the curve while descending. >On final everything was well below limits, but I was wondering about the >altitude compensating carbs and if they ever get out of whack or is this >normal. Does this square with anyone else's experience? > >Larry McFarland - 601HDS at 85 hours and still testing. > > > > ________________________________ Message 4 _____________________________________ Time: 05:26:42 PM PST US From: "Don Walker" Subject: Re: Stratus-List: Bings and EGTs --> Stratus-List message posted by: "Don Walker" Larry, It seems that if you put your nose down to descend from an established cruise without pulling back, then your rpm has to increase...more heat? don ----- Original Message ----- From: Hinde, Frank George (Corvallis) To: stratus-list@matronics.com Sent: Thursday, February 23, 2006 4:05 PM Subject: RE: Stratus-List: Bings and EGTs --> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" > Hmm, Can't say I have noticed this Larry, probably because I have never looked at the EGT guage except to wonder how a valve could stand all that heat...:) Frank Do not archive -----Original Message----- From: owner-stratus-list-server@matronics.com [mailto:owner-stratus-list-server@matronics.com] On Behalf Of LarryMcFarland Sent: Thursday, February 23, 2006 1:01 PM To: stratus-list Subject: Stratus-List: Bings and EGTs --> Stratus-List message posted by: LarryMcFarland --> > Hi guys, I went flying yesterday and noticed something that was interesting for those of us with Bing carbs. The EGTs climbed to their normal 1420 at high climb 4800 rpm and the higher I got (4500 ft), the more the EGTs drifted lower. It eventually permitted a high rpm without going above the 1400 deg f. Nice for a good cross-country cruise, but as I descended to land, EGTs climbed back up to set limits on my EIS and the rpms had to be reduced to keep the EGTs at or below limits. Not something I'm worried about, but it seemed strange to see EGTs behind the curve while descending. On final everything was well below limits, but I was wondering about the altitude compensating carbs and if they ever get out of whack or is this normal. Does this square with anyone else's experience? Larry McFarland - 601HDS at 85 hours and still testing. ________________________________ Message 5 _____________________________________ Time: 06:15:33 PM PST US From: LarryMcFarland Subject: Re: Stratus-List: Bings and EGTs --> Stratus-List message posted by: LarryMcFarland Don Walker wrote: >--> Stratus-List message posted by: "Don Walker" > > > No Don, I reduce throttle to lose altitude, do tip the nose down a bit, but found the reduction a little short of what was needed to keep EGTs from climbing. Coming off 4800 to about 4300 rpm and descending out of 4500 feet found EGTs rising to the set limit until 4000 rpm and then backed down well after cutting rpms to 3000 entering final approach. Never noticed this from a high of only 3500 feet, but from 4500 ft, it's curious why EGTs would rise on descent. Maybe the difference of a 50 degree rise is just delayed cooling or heat not flowing as fast out the pipes at a slight reduction of rpm on a descent approach. Larry do not archive >Larry, > It seems that if you put your nose down to descend from an established cruise without pulling back, then your rpm has to increase...more heat? don > > > Hi guys, > I went flying yesterday and noticed something that was interesting for > those of us with Bing carbs. The EGTs climbed to their normal 1420 at > high climb 4800 rpm and the higher I got (4500 ft), the more the EGTs > drifted lower. It eventually permitted a high rpm without going above > the 1400 deg f. Nice for a good cross-country cruise, but as I > descended to land, EGTs climbed back up to set limits on my EIS and the > rpms had to be reduced to keep the EGTs at or below limits. Not > something I'm worried about, but it seemed strange to see EGTs behind > the curve while descending. > On final everything was well below limits, but I was wondering about the > altitude compensating carbs and if they ever get out of whack or is this > normal. Does this square with anyone else's experience? > > Larry McFarland - 601HDS at 85 hours and still testing. > > > > > > > > > > > > > > > > > > > ________________________________ Message 6 _____________________________________ Time: 06:57:34 PM PST US From: "Don Walker" Subject: Re: Stratus-List: Bings and EGTs --> Stratus-List message posted by: "Don Walker" In that case your apparent wind may have something to do with it, which affects cowl pressure and air flow. do you suppose you are maintaining a constant cowl pressure though the descent? ----- Original Message ----- From: LarryMcFarland To: stratus-list@matronics.com Sent: Thursday, February 23, 2006 8:14 PM Subject: Re: Stratus-List: Bings and EGTs --> Stratus-List message posted by: LarryMcFarland > Don Walker wrote: >--> Stratus-List message posted by: "Don Walker" > > > > No Don, I reduce throttle to lose altitude, do tip the nose down a bit, but found the reduction a little short of what was needed to keep EGTs from climbing. Coming off 4800 to about 4300 rpm and descending out of 4500 feet found EGTs rising to the set limit until 4000 rpm and then backed down well after cutting rpms to 3000 entering final approach. Never noticed this from a high of only 3500 feet, but from 4500 ft, it's curious why EGTs would rise on descent. Maybe the difference of a 50 degree rise is just delayed cooling or heat not flowing as fast out the pipes at a slight reduction of rpm on a descent approach. Larry do not archive >Larry, > It seems that if you put your nose down to descend from an established cruise without pulling back, then your rpm has to increase...more heat? don > > > Hi guys, > I went flying yesterday and noticed something that was interesting for > those of us with Bing carbs. The EGTs climbed to their normal 1420 at > high climb 4800 rpm and the higher I got (4500 ft), the more the EGTs > drifted lower. It eventually permitted a high rpm without going above > the 1400 deg f. Nice for a good cross-country cruise, but as I > descended to land, EGTs climbed back up to set limits on my EIS and the > rpms had to be reduced to keep the EGTs at or below limits. Not > something I'm worried about, but it seemed strange to see EGTs behind > the curve while descending. > On final everything was well below limits, but I was wondering about the > altitude compensating carbs and if they ever get out of whack or is this > normal. Does this square with anyone else's experience? > > Larry McFarland - 601HDS at 85 hours and still testing. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >