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d3dw(at)sbcglobal.net
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 Posted: Thu May 06, 2010 4:21 am Post subject: egt readings |
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What are normal values for egt in the mid range...say 3500 rpm. I just installed a dual egt...been running it without one all these years.
My idle egt readings are even with smooth running up to about 1700 rpm or so. Then I'm getting rough running with my left bank showing about 900 and the right up to 1250. This problem has just developed with about 450 hrs on the Bing carbs. Can't find any air leaks, but it occured to me I don't know what normal is...could be the left is too cool.
Compression is even all the way around. don walker
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gkrysztopik(at)satx.rr.co
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| Posted: Thu May 06, 2010 4:58 am Post subject: egt readings |
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Don, I still don't have EGT's yet but I have a spreadsheet with others
EA-81's (non-Stratus) and two reported 1350 and one 1325.
Have you pulled the carb boots to inspect? Tightened plugs? Checked
exhaust manifold nuts? Fuel filters?
Gary Krysztopik
San Antonio, TX
Don Walker wrote:
| Quote: | What are normal values for egt in the mid range...say 3500 rpm. I just
installed a dual egt...been running it without one all these years.
My idle egt readings are even with smooth running up to about 1700 rpm
or so. Then I'm getting rough running with my left bank showing about
900 and the right up to 1250. This problem has just developed with
about 450 hrs on the Bing carbs. Can't find any air leaks, but it
occured to me I don't know what normal is...could be the left is too cool.
Compression is even all the way around. don walker
*
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larry(at)macsmachine.com
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| Posted: Fri May 07, 2010 10:14 am Post subject: egt readings |
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Don,
The volume of air to the Bings has a good deal to do with differences in
EGT. I found the cool side was getting less air pressure to the air
filter than the warm side.
Don't think you have any leaks and a well-adjusted pair of Bings will
provide EGTs of plus or minus 50 degrees of one another side to side.
1350 is a good target for
EGTs at 4500 to 4800 rpm in cruise. Would think EGTs would be lower at
3500 rpm. With the HDS wing, one seldom cruises below 4000 rpm.
If you have a bad ignition wire, EGTs should show an over-rich condition
(lower temps). Going with the higher temp suggests a lean condition
resulting from too much air and /or no problems with the ignition wires
that side. Example, in a steep descent toward the airport from 3000
feet, my reduced rpms will often see the EGT approach 1450, my set point
for the caution light. I have to pull the enrichment half way out to get
enough fuel to cool things. The EGTs nearly drop immediately and seldom
return the rest of the way down. Excess air in descent creates a very
lean condition temporarily at low rpms, 3500 to 3700 rpm.
Something to consider,
Larry McFarland 601HDS at www.macsmachine.com Stratus Subaru at 155 hours.
Don Walker wrote:
| Quote: | What are normal values for egt in the mid range...say 3500 rpm. I just
installed a dual egt...been running it without one all these years.
My idle egt readings are even with smooth running up to about 1700 rpm
or so. Then I'm getting rough running with my left bank showing about
900 and the right up to 1250. This problem has just developed with
about 450 hrs on the Bing carbs. Can't find any air leaks, but it
occured to me I don't know what normal is...could be the left is too cool.
Compression is even all the way around. don walker
*
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