Only think I would think of is a backfire or transient causing a pressure that plenum couldn’t handle? Maybe put a blow off valve somewhere on it?
Marc
From: Rotary motors in aircraft Sent: Sunday, February 16, 2020 3:46 AMTo: Rotary motors in aircraft <flyrotary@lancaironline.net>Subject: [FlyRotary] Intake Plenum 13 B
Completed the intake manifold for my 13B "plugs up" mount.Adjustable for the best performance (18 - 24 inch) then can be locked by silicone 50 mm hoseNext step to place the 4 injectors on the 44 mm intake runners.
https://drive.google.com/file/d/1Pn3iWOamh-KfVfaHtgaUg5HGT8dZSIpZ/view?usp=drivesdk
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Le Roux Breytenbach
South Africa