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jhnstniii(at)aol.com
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 Posted: Fri Jun 05, 2009 2:40 pm Post subject: Engine cooling issues and the #3 cylinder |
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Listers--Thought I would pass along a solution I haven't seen before on the list for the problem of the #3 cylinder running warm. Others have mentioned putting a washer behind the back baffle. We did that with little improvement. Then I realized we had glassed in our upper inlet ramps nice and symmetrically, but the engine is not symmetrical. The right bank of cylinders is forward of the left bank. If you glass in the upper inlet ramps symmetrically you will be "pinching" the airflow on the right side because the #1 cylinder is so far forward and there is a steep bottom ramp on the right side. If you put your hand in each of your inlets you will probably notice how much more room there is on the left side v. the right side. I could just get my hand through on the right side on ours. This restriction was what was causing the #3 to run hot.
I cut out and re-glassed the right upper ramp about 1 1/2 inches forward, so that the right upper ramp and right lower ramp surfaces were more parallel with no pinching of the airflow. Voila--the two rear cylinders now run even with the #3 much cooler than before. I can stick my hand right through there now.
Hope this helps. I called Vans and suggested they mention this in the instructions and plans.
LeRoy Johnston/David White (Ohio) RV-6A "Esperanza" 172 hours flying.
. Wanna slim down for summer? Go to America Takes it Off to learn how.
[quote][b]
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Jerry Grimmonpre'
Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142
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| Posted: Fri Jun 05, 2009 7:00 pm Post subject: Engine cooling issues and the #3 cylinder |
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LeRoy ...
Great story .... thank you for the observation/solution.
Jerry
do not archive
[quote] ---
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sat Jun 06, 2009 5:11 am Post subject: Engine cooling issues and the #3 cylinder |
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On 4 cyl Lycs the #2 and #3 will run hot if tightly baffled because the
intake side of the cylinder has no fins, but does need airflow past it.
Using silicone baffle spacers or something else to establish 1/8" or
more clearance between front of #2 and rear of #3 will cool temps 30
degrees or so. Cardinal owners learned this long ago as Cessna built
baffles too tight.
jhnstniii(at)aol.com wrote:
| Quote: | Listers--Thought I would pass along a solution I haven't seen before
on the list for the problem of the #3 cylinder running warm. Others
have mentioned putting a washer behind the back baffle. We did that
with little improvement. Then I realized we had glassed in our upper
inlet ramps nice and symmetrically, but the engine is not
symmetrical. The right bank of cylinders is forward of the left
bank. If you glass in the upper inlet ramps symmetrically you will be
"pinching" the airflow on the right side because the #1 cylinder is so
far forward and there is a steep bottom ramp on the right side. If
you put your hand in each of your inlets you will probably notice how
much more room there is on the left side v. the right side. I could
just get my hand through on the right side on ours. This restriction
was what was causing the #3 to run hot.
I cut out and re-glassed the right upper ramp about 1 1/2 inches
forward, so that the right upper ramp and right lower ramp surfaces
were more parallel with no pinching of the airflow. Voila--the two
rear cylinders now run even with the #3 much cooler than before. I
can stick my hand right through there now.
Hope this helps. I called Vans and suggested they mention this in the
instructions and plans.
LeRoy Johnston/David White (Ohio) RV-6A "Esperanza" 172 hours flying.
.
------------------------------------------------------------------------
Wanna slim down for summer? Go to America Takes it Off
<http://www.aolhealth.com/diet/weight-loss-program/?ncid=emlcntusheal00000001>
to learn how.
*
*
|
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sat Jun 06, 2009 5:42 am Post subject: Engine cooling issues and the #3 cylinder |
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Do you have a photo example?
Tim
On Jun 6, 2009, at 7:46 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
| Quote: |
On 4 cyl Lycs the #2 and #3 will run hot if tightly baffled because
the intake side of the cylinder has no fins, but does need airflow
past it. Using silicone baffle spacers or something else to
establish 1/8" or more clearance between front of #2 and rear of #3
will cool temps 30 degrees or so. Cardinal owners learned this long
ago as Cessna built baffles too tight.
jhnstniii(at)aol.com wrote:
> Listers--Thought I would pass along a solution I haven't seen
> before on the list for the problem of the #3 cylinder running
> warm. Others have mentioned putting a washer behind the back
> baffle. We did that with little improvement. Then I realized we
> had glassed in our upper inlet ramps nice and symmetrically, but
> the engine is not symmetrical. The right bank of cylinders is
> forward of the left bank. If you glass in the upper inlet ramps
> symmetrically you will be "pinching" the airflow on the right side
> because the #1 cylinder is so far forward and there is a steep
> bottom ramp on the right side. If you put your hand in each of
> your inlets you will probably notice how much more room there is on
> the left side v. the right side. I could just get my hand through
> on the right side on ours. This restriction was what was causing
> the #3 to run hot.
>
> I cut out and re-glassed the right upper ramp about 1 1/2 inches
> forward, so that the right upper ramp and right lower ramp surfaces
> were more parallel with no pinching of the airflow. Voila--the
> two rear cylinders now run even with the #3 much cooler than
> before. I can stick my hand right through there now.
> Hope this helps. I called Vans and suggested they mention this in
> the instructions and plans.
> LeRoy Johnston/David White (Ohio) RV-6A "Esperanza" 172 hours flying.
>
> .
> ---
> ---------------------------------------------------------------------
> Wanna slim down for summer? Go to America Takes it Off <http://www.aolhealth.com/diet/weight-loss-program/?ncid=emlcntusheal00000001
> > to learn how.
> *
> *
--
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