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Building Integrity
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Date:  11-2-2019
Number of Hours:  1.00
Manual Reference:  Section 2
Brief Description:  Balancing the CHTs

A healthy engine relies on consistent opperating tempuratures that are balanced. In most applications I've seen with UL engines, the cylinder heads that are at the air opening are always running too cool, and my bird is no exception. In fact, I've spent many hours trying to simply Raise the CHT's on cylinders 5/6 with little success. Today I added a baffle to the forward facing fins, to the included plenum dams I've installed and still these cylinders simply run too cool. In fact 245 at WOT in cruise. Yes it's 35 deg. OAT, but the spread is massive, with the hottest cylinder being 312F.
At this point I think the next natural course of action will be designing an interior baffle on the inside of the plenum box that directs the air up and over to the back side of both cylinders, blocking them off from all incoming airflow and directing the air towards, cylinders 3 and 4 instead which are also the warmest of the bunch. The plenums are acting much more like a pressure box than a flowing system which means the incoming air really needs to simply evenly distributed to all 6 jugs. The other option would be to design an airflow restrictor on the bottom of the forward cylinders, affectively not allowing airflow to escape through their fins.
The GOOD news here is that I'm only going to end up with a much more efficient cooling system than every before with less drag to boot. It's just time and money right?
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5/6 temps are far too low

5/6 temps are far too low

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forward facing fin cover

forward facing fin cover

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