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
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Stratus-List message posted by: LarryMcFarland <larry@macsmachine.com>
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
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
--> <larry@macsmachine.com>
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bings and EGTs |
--> Stratus-List message posted by: LarryMcFarland <larry@macsmachine.com>
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)" <frank.hinde@hp.com>
>
>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
>--> <larry@macsmachine.com>
>
> 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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bings and EGTs |
--> Stratus-List message posted by: "Don Walker" <d3dw@msn.com>
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)<mailto:frank.hinde@hp.com>
To: stratus-list@matronics.com<mailto: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)" <frank.hinde@hp.com<mailto:frank.hinde@hp.com>>
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>
[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
--> <larry@macsmachine.com<mailto:larry@macsmachine.com>>
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bings and EGTs |
--> Stratus-List message posted by: LarryMcFarland <larry@macsmachine.com>
Don Walker wrote:
>--> Stratus-List message posted by: "Don Walker" <d3dw@msn.com>
>
>
>
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Bings and EGTs |
--> Stratus-List message posted by: "Don Walker" <d3dw@msn.com>
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<mailto:larry@macsmachine.com>
To: stratus-list@matronics.com<mailto: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 <larry@macsmachine.com<mailto:larry@macsmachine.com>>
Don Walker wrote:
>--> Stratus-List message posted by: "Don Walker" <d3dw@msn.com<mailto:d3dw@msn.com>>
>
>
>
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.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|