Today's Message Index:
----------------------
1. 09:42 AM - Re: test flight for changing Bing main jets from 176 to 178INNOCENT GLOBAL 0.0000 1.0000 -2.0210 (gary)
2. 10:06 AM - Re: test flight for changing Bing main jets from 176 to 178INNOCENT GLOBAL 0.0000 1.0000 -2.0210 (Hinde, Frank George (Corvallis))
3. 11:50 AM - Re: test flight for changing Bing main jets from 176 to 178INNOCENT GLOBAL 0.0000 1.0000 -2.0210 (LarryMcFarland)
Message 1
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| Subject: | test flight for changing Bing main jets from 176 to |
178INNOCENT GLOBAL 0.0000 1.0000 -2.0210
--> Stratus-List message posted by: "gary" <gkrysztopik@satx.rr.com>
Larry,
Thanks for reporting on this, nice to see you're being so systematic about
the tests. I don't have EGT's yet (but will soon) but I get 190 water temp
and 220 oil temp at 4800 rpm cruise, and 200/230 when WOT and/or climbing.
I was never clear on what a good oil temp is for the Stratus especially
because of the unique temp probe location in the pan. It just seems lower
is better for the long-term health of the engine. I'd love to find an old
beater subaru car and mount an oil temp sensor in the pan to see what it
runs at in the car. I think I'll keep an eye out for one.
I never changed any jets after having RAM do the heads and you guys have me
wondering. I guess I need to do some tests. I did swap out the foam air
filters for K&N's so I'd better check soon.
gary
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of LarryMcFarland
Sent: Friday, April 14, 2006 9:05 PM
Subject: Stratus-List: test flight for changing Bing main jets from 176 to
178INNOCENT GLOBAL 0.0000 1.0000 -2.0210
--> Stratus-List message posted by: LarryMcFarland <larry@macsmachine.com>
Hi Guys,
It's been a month since the main jets were changed, but testing waited
for Sun n Fun and weather. Thought I should finally report the
results for those with a Stratus EA81 and Ram Performance heads.
Sunshine and tall overcast clouds were on tap today with just a few
sprinkles. About 2:00 weather was finally flyable with reported ceilings
of 3800 ft. I did preflight and twice checked the header tank for water.
Still pitched at 17-degrees, N601EZ lifted off at 2:30, climbed into the
south practice area and I observed the effects of changing the Bing main
jets from 176 to 178. A 180 main jet was tried last year and it caused
the engine to run a little rough. On climb out at high rpm the EGT never
exceeded 1400 deg F. Engine power seemed the same and it ran smoothly.
At 3500 feet I leveled off, pushed the throttle fully forward and
watched the tach reach 4950 rpm but no further. The richer mixture was
obviously cooler and yielded a little less horsepower. I adjusted
elevator trim to optimize airspeed and held a level attitude and waited.
The airspeed topped out at 128 mph, 5 less than before. EGTs settled to
1350 degrees F. and stayed there. At full throttle, oil temperature
finally reached my alarm set point of 250 degrees and the light came on,
so I backed off to 120 mph and the oil temp settled to 240 degrees F.
Cylinder head and coolant temps were 204 degrees F. Ambient air was
78-degrees F, which is hot for this time of year, but I was pleased that
the EGTs were lower with this 178 main jet. At a cruise airspeed of 120
mph, an exhaust gas temp of 1325 degrees F was a definite improvement.
Despite a slight loss of top end rpm, I'm really happy with the 601 and
Stratus Subaru at this point in time. Ram Performance said 1350 was a
good target EGT temp and Stratus said that 1500 would be a good max
EGT. So I think this 178 main jet will stay on and I'll continue to
watch it as the season changes.
The tower broke my focus with a warning for possible thunderclouds, rain
and severe convective in the area. Recalling last night's local
tornados, I immediately turned around and headed back under a much
darker set of clouds and a thick haze at 3000 feet. My landing was real
good and I used 23 to return to the hangars with 55 minutes on the
clock. With three quarters of the fuel used up, I'll probably drain the
rest and prepare for paint.
Larry McFarland - 601HDS at www.macsmachine.com
Message 2
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| Subject: | test flight for changing Bing main jets from 176 to |
178INNOCENT GLOBAL 0.0000 1.0000 -2.0210
--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
Yes I would!
If you have the bing manual you can check it pretty easily...Tie the
airplane to a post and run it up to cruise.
I believe you pull open the choke levers (I have a primer so I had to
tie a pair of long lengths of safety wire to each lever) a little and
the rpms should rise a little and then drop when the mixture is
correct...if the RPMs don't rise its to weak.
This is from memory but it is something like that.
If you have the Ram heads you are almost certainly running way to weak.
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary
Sent: Saturday, April 15, 2006 9:42 AM
Subject: RE: Stratus-List: test flight for changing Bing main jets from
176 to 178INNOCENT GLOBAL 0.0000 1.0000 -2.0210
--> Stratus-List message posted by: "gary" <gkrysztopik@satx.rr.com>
Larry,
Thanks for reporting on this, nice to see you're being so systematic
about the tests. I don't have EGT's yet (but will soon) but I get 190
water temp and 220 oil temp at 4800 rpm cruise, and 200/230 when WOT
and/or climbing.
I was never clear on what a good oil temp is for the Stratus especially
because of the unique temp probe location in the pan. It just seems
lower is better for the long-term health of the engine. I'd love to
find an old beater subaru car and mount an oil temp sensor in the pan to
see what it runs at in the car. I think I'll keep an eye out for one.
I never changed any jets after having RAM do the heads and you guys have
me wondering. I guess I need to do some tests. I did swap out the foam
air filters for K&N's so I'd better check soon.
gary
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of
LarryMcFarland
Sent: Friday, April 14, 2006 9:05 PM
Subject: Stratus-List: test flight for changing Bing main jets from 176
to 178INNOCENT GLOBAL 0.0000 1.0000 -2.0210
--> Stratus-List message posted by: LarryMcFarland
--> <larry@macsmachine.com>
Hi Guys,
It's been a month since the main jets were changed, but testing waited
for Sun n Fun and weather. Thought I should finally report the results
for those with a Stratus EA81 and Ram Performance heads.
Sunshine and tall overcast clouds were on tap today with just a few
sprinkles. About 2:00 weather was finally flyable with reported ceilings
of 3800 ft. I did preflight and twice checked the header tank for water.
Still pitched at 17-degrees, N601EZ lifted off at 2:30, climbed into the
south practice area and I observed the effects of changing the Bing main
jets from 176 to 178. A 180 main jet was tried last year and it caused
the engine to run a little rough. On climb out at high rpm the EGT never
exceeded 1400 deg F. Engine power seemed the same and it ran smoothly.
At 3500 feet I leveled off, pushed the throttle fully forward and
watched the tach reach 4950 rpm but no further. The richer mixture was
obviously cooler and yielded a little less horsepower. I adjusted
elevator trim to optimize airspeed and held a level attitude and waited.
The airspeed topped out at 128 mph, 5 less than before. EGTs settled to
1350 degrees F. and stayed there. At full throttle, oil temperature
finally reached my alarm set point of 250 degrees and the light came on,
so I backed off to 120 mph and the oil temp settled to 240 degrees F.
Cylinder head and coolant temps were 204 degrees F. Ambient air was
78-degrees F, which is hot for this time of year, but I was pleased that
the EGTs were lower with this 178 main jet. At a cruise airspeed of 120
mph, an exhaust gas temp of 1325 degrees F was a definite improvement.
Despite a slight loss of top end rpm, I'm really happy with the 601 and
Stratus Subaru at this point in time. Ram Performance said 1350 was a
good target EGT temp and Stratus said that 1500 would be a good max EGT.
So I think this 178 main jet will stay on and I'll continue to watch it
as the season changes.
The tower broke my focus with a warning for possible thunderclouds, rain
and severe convective in the area. Recalling last night's local
tornados, I immediately turned around and headed back under a much
darker set of clouds and a thick haze at 3000 feet. My landing was real
good and I used 23 to return to the hangars with 55 minutes on the
clock. With three quarters of the fuel used up, I'll probably drain the
rest and prepare for paint.
Larry McFarland - 601HDS at www.macsmachine.com
Message 3
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| Subject: | Re: test flight for changing Bing main jets from 176 to |
178INNOCENT GLOBAL 0.0000 1.0000 -2.0210
--> Stratus-List message posted by: LarryMcFarland <larry@macsmachine.com>
Gary
If you look into the Archives, you'll see a page-long ditty that I wrote
last year on initial jet sizes
and what I went to since the RAM heads. It seems to be the best of what
is so far. Yesterdays flight
proved the main jets needed to be larger to keep EGT at a best range.
I'm sure that
the previous main jets were able to wring a little more horsepower out
of it, but I never fly wide
open anyway, so for 120 to 125 mph cross country these jets work "best".
You probably don't want to throw the foam filters away just yet.
Larry McFarland - 601HDS at www.macsmachine.com
gary wrote:
>--> Stratus-List message posted by: "gary" <gkrysztopik@satx.rr.com>
>
>
>Larry,
>
>Thanks for reporting on this, nice to see you're being so systematic about
>the tests. I don't have EGT's yet (but will soon) but I get 190 water temp
>and 220 oil temp at 4800 rpm cruise, and 200/230 when WOT and/or climbing.
>I was never clear on what a good oil temp is for the Stratus especially
>because of the unique temp probe location in the pan. It just seems lower
>is better for the long-term health of the engine. I'd love to find an old
>beater subaru car and mount an oil temp sensor in the pan to see what it
>runs at in the car. I think I'll keep an eye out for one.
>
>I never changed any jets after having RAM do the heads and you guys have me
>wondering. I guess I need to do some tests. I did swap out the foam air
>filters for K&N's so I'd better check soon.
>
>gary
>
>
>
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