Today's Message Index:
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1. 03:23 PM - CHT update (Ralph E. Capen)
2. 06:07 PM - Re: CHT update (Deems Herring)
Message 1
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As many of you may know, I have been obsessing a bit about my CHT's...to
get them consistent.
Here's the setup:
IO360B1F6
9.2:1 pistons
AFP Fuel Injection
LASAR Ignition with CHT sender relocated to allow for testing
Vetterman Dual Crossover Heater/Mufflers
SamJames cowl and plenum
Advanced Flight Systems 3400 Engine Monitor
Oil Cooler mounted behind #4 cylinder
Air for both Heater/Mufflers behind #3 cylinder
For constant power setting, here's the consistency that I have achieved:
#1 and #3 cylinders run within three degrees (avg) of each other
#2 and #4 cylinders run within three degrees (avg) of each other
The #1/#3 cylinders run 8.5 degrees hotter (avg) than the #2/#4
cylinders
With the members of the sets of cylinders running this close each other,
I'm thinking that I have the balance (front to rear) for each side
pretty well matched.
I'm trying to wrap my head around what could be causing the right side
to run hotter than the left. Here's some of what I'm thinking...: With
this plenum set-up, I'm thinking that the pressure/volume should
equalize from left to right. This would leave me with not much to
change to cause more cooling air to go from the left to the right -
meaning that I probably have to live with the differences.
Alternatively, maybe it's not really hotter...the two sets of CHT wires
for the left side (both equal length) are about three feet longer than
the ones for the right side (again, both equal length). Could the
difference in the lengths of the wires account for the reported
temperature difference?
I'm pretty close to thinking that this is as good as it gets...but I
would really like to know why...
Thanks,
Ralph
Message 2
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The accuracy of the readings is a different question but the relative flow
on each side should be controlled by the length of the baffle below and bet
ween the cylinders. increase the length of the baffle for the cold cylinder
s or or shorten the ones for the hot cylinders to change the balance. Remov
e the same amount from both ends of baffle if you don't want to change the
balance between 1/3 or 2/4. I wouldn't have a pm with calling what you have
close enough.
Deems
Here's the setup:
IO360B1F6
9.2:1 pistons
AFP Fuel Injection
LASAR Ignition with CHT sender relocated to allow for testing
Vetterman Dual Crossover Heater/Mufflers
SamJames cowl and plenum
Advanced Flight Systems 3400 Engine Monitor
Oil Cooler mounted behind #4 cylinder
Air for both Heater/Mufflers behind #3 cylinder
For constant power setting=2C here's the consistency that I have achieved:
#1 and #3 cylinders run within three degrees (avg) of each other
#2 and #4 cylinders run within three degrees (avg) of each other
The #1/#3 cylinders run 8.5 degrees hotter (avg) than the #2/#4 cylinders
With the members of the sets of cylinders running this close each other=2C
I'm thinking that I have the balance (front to rear) for each side pretty w
ell matched.
I'm trying to wrap my head around what could be causing the right side to r
un hotter than the left. Here's some of what I'm thinking...: With this pl
enum set-up=2C I'm thinking that the pressure/volume should equalize from l
eft to right. This would leave me with not much to change to cause more co
oling air to go from the left to the right - meaning that I probably have t
o live with the differences. Alternatively=2C maybe it's not really hotter
...the two sets of CHT wires for the left side (both equal length) are abou
t three feet longer than the ones for the right side (again=2C both equal l
ength). Could the difference in the lengths of the wires account for the r
eported temperature difference?
I'm pretty close to thinking that this is as good as it gets...but I would
really like to know why...
Thanks=2C
Ralph
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