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Al Gietzen wrote:
From what little data I was able to find for the water pump on the 20B, it will pump about 35 gpm at engine RPM of 6000. Marginal, at best, for that climbout on a 90 degree day. At altitude, at cruise; the EWP may be able to handle it.
Gentlemen: as a data point I have in front of me the factory service manual for the 1985 RX-7. The Technical Data section lists the water pump capacity as 150-160 liters per minute/39.6-42.3 U.S. gpm/33.0-35.2 Imp. gpm at 6500 rpm of engine. They list a 1:1.18 eshaft/pump pulley ratio. Given that these numbers are for both the NA 12A and 13B models I'd definitely check to see if maybe that 20B might require a tad more flow especially running at 6K rpm at a relatively high power setting.
-Mike Robert
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