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Rich, good questions, but like many of the choices we in
alternative engines face, there is no yes/no, good/bad- just another
risk factor with pros and cons to consider. I believe that there is
some technical merit to using an electrical water pump such as reducing pumping
HP losses, perhaps less weight, optimum coolant temp control,
etc. . You could also factor in your water pump current load
into your overall power considerations and run with a larger battery to get you
your minimum alternator-out time. But, I must admit that I find the
reliability and no need for attention mechanical pump preferable for
myself.
Me?, I'm waiting for a pizeo electric ignition
system and a mechanical fuel pump and then I can throw the
battery away {:>).
Ed
howe----- Original Message -----
Sent: Tuesday, July 11, 2006 1:02
AM
Subject: [FlyRotary] Re: - EWP
Power
In a message dated 7/10/2006 11:43:35 AM Central Standard Time, jesse@jessfarr.com writes: Have any of
you ewp folks looked at CSR Performance products stuff? They
tell me
they have a high volume pump that fits into some good looking
anodized
aluminum housings for big block car stuff that will pump up to 70
gpm
and is expected to last for 5500 hours or so; and, they have a remote
that is something like davies-craig that is also expected to last about
5500
hours and pumps around 35 to 37 gpm. They run in the $250 to $300
range,
supposedly use about 5 or 6 amps; and, I would like to learn from
someone
else's experimentation, if possible. <g>
jofarr, soddy
tn
http://www.csr-performance.com/
I have a potential safety question with using an electric pump, unless
the engine is using a magneto.
The ignition system runs on battery/alternator power. If it and the FI
are run by an ECU, it too needs power. The fuel pumps need electricity. There
are other electric hungry mechanism that need power.
In an alternator/battery failure (short of having dual alt and batt) to
have a water pump sucking 5 or more amps of power, this significantly shortens
the available flight time before engine stoppage.
If the engine is magnitoed, when the electrons disappear and the
pump stops, all that will happen is that the engine will fry---- The result
will be the same
Rich
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