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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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I'm guessing, as above, they are to improve the efficiancy of the cooler. FWIW I took apart an RX-7 cooler which had thin perforated strips of aluminum in each tube. I removed them all and welded the end cap back on. Can't tell the difference in operation.
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Gordon
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'71 911 Coupe 3,0L outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage
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