From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Water Pump
Date: Fri, 15 May 2020 22:01:36 +0800
References: <list-241861@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-241861@logan.com>
Message-Id: <0662E2BA-7DEA-4A07-97EB-EE2C3D5C0AA7@gmail.com>

Thanks guys.
I=E2=80=99ve heard various reports, but i had thought the consensus was =
the Renesis pump didn=E2=80=99t cavitate till past 8K.
I do want to be able to sustain 7500rpm for at least a few minutes.=20
Should I change to a larger pump pulley or undersize the eccentric shaft =
pulley?=20
Is there clear evidence from the racers and not simply the producers of =
pumps etc.?
I do have a larger pulley on the Alternator.=20
Cheers.
Steve

> On 15 May 2020, at 9:47 pm, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>=20
> Steve,
> =20
> I didn=E2=80=99t see any reason to replace the stock 2004 water pump. =
An aftermarket impeller / pump is available but the car forums indicate =
many have failed in a short period of time.  =
https://shop.mazmart.com/en/rx8-re-medy-high-flow-water-pump          I  =
used an underdrive main pulley from the beginning. Unorthodox Racing I =
believe.
> =20
> Bobby
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20=

> Sent: Friday, May 15, 2020 6:58 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Water Pump
> =20
> Thanks Todd.
> Enjoyed your reply. Thanks a heap.
>=20
> Has anyone got definitive knowledge re the 2004 renesis 13b water =
pump.=20
> Is there a replacement with significantly better flow or lower =
cavitation that I should retrofit to maximise cooling capacity?
>=20
> Steve
>=20
> > On 15 May 2020, at 6:28 pm, Todd Bartrim bartrim@gmail.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > Well, I gotta admit that I'm a stubborn SOB. and way back when, =
another stubborn SOB whom I shouldn't name, but his initials are Paul =
Lamar.... was adamant that no way ever on God's green earth would an =
electric water water pump have any hope of cooling anything bigger than =
a lawnmower. So basically... it was challenge accepted!=20
> > Now at the time there was another Ozzie frequenting this list by the =
name of Leon Promet who had some rotary racing experience and was a big =
proponent of the EWP. (RIP Leon) But he was also a great talker and an =
entertaining fellow whom I enjoyed reading his many post on varied =
aspects of rotary engines. The EWP also promised a solution to a few =
other issues that were certainly not insurmountable, such as clearance =
for the mechanical water pump which usually resulted in an unsightly and =
draggy cowl bump. At the time, that seemed like something I wanted to =
avoid, due to drag and all that $%^* but after figuring out that I never =
should've built an iAirplane like all the other latte sucking so called =
experimenters out there, I started to realize that a Van's RV, while it =
is a great design and is perfect for many, many assemblers out there, =
it's probably not the plane I should've built. Don't get me wrong, it's =
a great plane and lot's of fun, but it's not really the plane I should =
be flying. The attached picture shows the automotive equivalent to my =
airplane.
> > Anyways, at the end of the day, I've got a fast airframe with big =
draggy bushwheels, that while not quite a STOL plane can still cruise =
sorta fast, blah, blah, blah, blah.....
> > So anyways, I like it, I think the EWP is a great idea and it does =
work. And I'm an experimenter. Enough said.
> >=20
> > Todd Bartrim (I should've went to bed instead of pouring a rum and =
answering that email.... )
> >=20
> >=20
> > On Fri, May 15, 2020 at 1:20 AM Stephen Izett =
stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
> > Hi Todd. What was the logic behind the choice to go with an electric =
water pump.
> > Was it concerns over cavitation at high rpm or as a backup.
> > Sorry if this has already been talked through.
> >=20
> > Steve Izett
> >=20
> > > On 15 May 2020, at 3:40 pm, Todd Bartrim bartrim@gmail.com =
<flyrotary@lancaironline.net> wrote:
> > >=20
> > > Yup, just the stock wheel. the turbo is an Hitachi 18S-2S. I still =
think you should take LeRoux up on his offer of that turbo. You could =
either modify the turbo manifold or use it to model a custom made =
manifold. Either way would likely be easier than trying to fit an =
aftermarket turbo. There was not a stock Renesis turbo so you're not =
gonna find anything easier.
> > > There's always something like this =
https://www.rx8performance.com/products/rx-8performanceturbokit and it =
doesn't look too complicated, or heavy, or expensive..... nahh, I'd =
still find a way to attach that old gen turbo to your Renesis.=20
> > > I'm using the Davies Craig EWP130 =
https://daviescraig.com/product/ewp130-12v-130lpm34gpm-remote-electric-wat=
er-pump-8180/ewp130-electric-water-pump-alloy-12v-8180
> > >=20
> > > Todd Bartrim (rebuilding a water pump right now, but it's a well =
water pump)
> > >=20
> > >=20
> > > On Thu, May 14, 2020 at 3:20 PM 12348ung@gmail.com =
<flyrotary@lancaironline.net> wrote:
> > > Todd,
> > >=20
> > > Are you running the standard hot section turbine wheel? Do you =
have the hitachi RX7 turbo? Also what model water pump did you use??
> > >=20
> > > Regards,
> > >=20
> > > Neil.
> > >=20
> >=20
> >=20
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