Mailing List flyrotary@lancaironline.net Message #63634
From: Matt Boiteau <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] water pump and alt speeds
Date: Fri, 18 Aug 2017 11:36:39 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
From the rx8club group, they say the stock generation rx8 water pump will start cavitation around 6000-6500rpm using stock pullies. This guy simulated the pumps and got around 7000rpm.


On Aug 18, 2017 02:19, "Neil Unger" <flyrotary@lancaironline.net> wrote:
Gents,

                   I am getting belt slip over 6500 engine revs and suspect that the water pump and alt speeds are too fast and taking too much power to drive.  I will measure all pulleys tomorrow, but just need some speeds to work towards.  I have been told that an alternator can happily run between 3000 and say 8-10,000 even up to 30,000, but the higher speed will chew 15 HP and achieve nothing in extra charge especially when I only have to run avionics and charge the battery.    Water pump has a speed whatever that is over which it just cavitates and does nothing. What is that speed for the RX8??  Neil.


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