dbaflyer
Well Known Member
I have 6 hours on my newly minted RV9A. It has an O-320 (carb) with a Catto 3 blade propeller. Diameter 67 Pitch 70
#4 cylinder is consistently the hottest
#3 is the next hottest
#1 is the next hottest
#2 the coolest by far
Here is an image of some data from a flight from a couple days ago. It shows RPM reaching 2470 on climb out before I reduced down a bit to lower the CHT on #4. I also lowered the nose for a shallower climb.
What I am looking for is what to do in order to raise #2 CHT in order to give #4 more cooling. I currently have the standard vans blocking dams installed on the front of #2. You would think that deflection would give more air to #4 and less to #2 but maybe that's not the case?
The IAS during this period on the chart ranged from climbing through 110 KTS and then up to around 125 KTS.
#4 cylinder is consistently the hottest
#3 is the next hottest
#1 is the next hottest
#2 the coolest by far
Here is an image of some data from a flight from a couple days ago. It shows RPM reaching 2470 on climb out before I reduced down a bit to lower the CHT on #4. I also lowered the nose for a shallower climb.
What I am looking for is what to do in order to raise #2 CHT in order to give #4 more cooling. I currently have the standard vans blocking dams installed on the front of #2. You would think that deflection would give more air to #4 and less to #2 but maybe that's not the case?
The IAS during this period on the chart ranged from climbing through 110 KTS and then up to around 125 KTS.