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midlife midlife is offline
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Join Date: Apr 2004
Location: Central CA
Posts: 567
The back curved blades of the 3.6 fan would reduce the efficiency, but that alone would not account for the lower air flow. I suspect that fan needed to be designed for a lower flow rate to prevent stall. The 3.6 had the engine mounted oil cooler removed so the total air flow area is reduced and the flow resistance would be greater.

Most modern automotive fans have forward swept blades to reduce noise, but not lose as much efficiency as the backward swept blades.
'69 911 Targa w/ 3.2
Old 08-09-2009, 03:21 PM
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