From: "Matt Boiteau" <flyrotary@lancaironline.net>
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Date: Fri, 18 Aug 2017 11:36:39 -0400
Message-ID: <CAP-UEKttj2o2caxMSRnx+OecnNCAv4FwUBnwfhMVZd=tVaBtnw@mail.gmail.com>
Subject: Re: [FlyRotary] water pump and alt speeds
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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.

https://www.rx8club.com/series-i-tech-garage-22/quantitative-coolant-flow-simulation-254907

I use these on my engine to slow down the alt and pump.
https://www.rx8performance.com/products/performance-pullies


-Matt Boiteau

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.
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.
> net:81/lists/flyrotary/List.html
>

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<div dir=3D"auto">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.<div dir=3D"auto"><br><=
/div><div dir=3D"auto"><a href=3D"https://www.rx8club.com/series-i-tech-gar=
age-22/quantitative-coolant-flow-simulation-254907">https://www.rx8club.com=
/series-i-tech-garage-22/quantitative-coolant-flow-simulation-254907</a><br=
><div dir=3D"auto">=C2=A0</div><div dir=3D"auto">I use these on my engine t=
o slow down the alt and pump.</div><div dir=3D"auto"><a href=3D"https://www=
.rx8performance.com/products/performance-pullies" target=3D"_blank">https:/=
/www.rx8performance.<wbr>com/products/performance-<wbr>pullies</a><br></div=
><div dir=3D"auto"><br></div><div dir=3D"auto"><br><br><div data-smartmail=
=3D"gmail_signature" dir=3D"auto">-Matt Boiteau</div></div></div></div><div=
 class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Aug 18, 2017 02:19=
, &quot;Neil Unger&quot; &lt;<a href=3D"mailto:flyrotary@lancaironline.net"=
>flyrotary@lancaironline.net</a>&gt; wrote:<br type=3D"attribution"><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">Gents,<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am g=
etting 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.=C2=A0 I will me=
asure all pulleys tomorrow, but just need some speeds to work towards.=C2=
=A0 I have been told that an alternator can happily run between 3000 and sa=
y 8-10,000 even up to 30,000, but the higher speed will chew 15 HP and achi=
eve nothing in extra charge especially when I only have to run avionics and=
 charge the battery.=C2=A0 =C2=A0 Water pump has a speed whatever that is o=
ver which it just cavitates and does nothing. What is that speed for the RX=
8??=C2=A0 Neil.<br>
<br>
<br>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.<wbr>net:81/lists/flyrotary/List.<wbr>html</a><br>
</blockquote></div></div>

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