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Originally Posted by Les
How thick the fins?
Suggest that 30FPI x 0.1 fins would be superior - 8 mm between tubes
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30FPI is pretty restrictive if the fins are crenulated like I'm imagining they are.
The Nippon-Denso cores which are prevalent here in Oz have the fins cut and crenulated as well, so even though the metal is 0.1mm or so thick, the fin's cross-section is more like 0.3-0.4mm thick.
At really low air velocities through the fins the air tends to turbulate well enough for even fairly open FPI's to keep radiator efficiency high.
If the fins were just basic flat folds, then yeah - maybe a higher FPI. Would need to keep on eye on the pressure drop though.