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Building Integrity
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Date:  10-7-2019
Number of Hours:  0.50
Manual Reference:  Section 2
Brief Description:  Fine tune the CHT's again

With my first 390is as well as the current 520is, cylinders 5 and 6 have been consistently cooler than the rest by a good 20-30 deg F in cruise. This large delta only means the other 4 could really use more of the molecules floating around inside my plenums. One of the first tricks I used to raise their temps was to dam off the plenum in front of the cylinders using a flat plate. This was a non-efficient way to tackle the issue but worked alright. This time I want to dam them off again, but using a smooth and more efficient manner. Tonight started that process by laying up a flat 3 ply BID section using west systems on my dirty bench over plastic. The goal here being able to block off the ram air coming into the intakes and rather send the air over the top of each cylinder equally. To do this I have to virtually re-route the path of air from entry point all the way to the cylinder heads without using any sharp transtions. If this works well, I will be able to start closing off each of the intakes little by little in order to get the optimum 295deg cruise temp without going over max continuous of 356deg in any situation. This in turn will reduce overall cooling drag which only translates to speeeeed. Currently she holds steady at 210kts TAS as she sits, so I'm hoping for another couple knots after I complete this task.
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3 ply layp curing

3 ply layp curing

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