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

> On 15 May 2020, at 9:47 pm, Bobby J. Hughes bhughes@qnsi.net <flyrotary@lancaironline.net> wrote:
>
> Steve,
> 
> I didn’t 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.
> 
> Bobby
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
> Sent: Friday, May 15, 2020 6:58 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Water Pump
> 
> Thanks Todd.
> Enjoyed your reply. Thanks a heap.
>
> Has anyone got definitive knowledge re the 2004 renesis 13b water pump.
> Is there a replacement with significantly better flow or lower cavitation that I should retrofit to maximise cooling capacity?
>
> Steve
>
> > On 15 May 2020, at 6:28 pm, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
> >
> > 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!
> > 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.
> >
> > Todd Bartrim (I should've went to bed instead of pouring a rum and answering that email.... )
> >
> >
> > 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.
> >
> > Steve Izett
> >
> > > On 15 May 2020, at 3:40 pm, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
> > >
> > > 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.
> > > I'm using the Davies Craig EWP130 https://daviescraig.com/product/ewp130-12v-130lpm34gpm-remote-electric-water-pump-8180/ewp130-electric-water-pump-alloy-12v-8180
> > >
> > > Todd Bartrim (rebuilding a water pump right now, but it's a well water pump)
> > >
> > >
> > > On Thu, May 14, 2020 at 3:20 PM 12348ung@gmail.com <flyrotary@lancaironline.net> wrote:
> > > Todd,
> > >
> > > Are you running the standard hot section turbine wheel? Do you have the hitachi RX7 turbo? Also what model water pump did you use??
> > >
> > > Regards,
> > >
> > > Neil.
> > >
> >
> >
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