Roland,
We have noted that the Whirlwind blades cause the door in the center of the cowl
to lift slightly in flight which didn't occur with the Warp Drive blades. We
attribute this to more air entering the engine compartment.
Our 914 cools properly using the factory supplied firewall forward kit. It is
very important to seal all gaps in the cooling duct so that all air must pass
through a radiator. We even seal between the bottom of the coolant radiator and
the top of the oil radiator with tape.
Jim & Heather
N241BW
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