interesting.  what parts are proprietary in a revmaster that are not in a GP?




On Tue, Jun 21, 2016 at 4:56 PM, Mike Stirewalt via KRnet
<krnet at list.krnet.org> wrote:
> A year or two ago, someone with a new Revmaster - I think it was the
> R-2300 - sent us a picture of head/valve damage he had suffered with his
> new engine.  Someone else was referenced at that time who had the same
> problems with that engine.
>
> How could that happen?  Nobody knows the VW better than Revmaster Joe yet
> here were people having serious issues with their new (and really nice)
> R-2300 engines.
>
> There's plenty of people flying that engine who don't have those
> problems, so how does this sort of thing happen?
>
> I can postulate just how -
>
> Somebody there at the shop in Hesperia took parts off the shelf to put
> the engine together like they'd done dozens or maybe hundreds of times
> before.  I doubt Joe Horvath does assembly these days, but I'm just
> guessing.  I doubt whoever put the troublesome engines together did
> anything wrong - but I'd also bet they didn't put the engine together as
> carefully as a person would who was going to fly behind it.  I'd bet they
> just took the valves out of their boxs and put them in.  I'd bet they
> didn't use any dykem to check the seats with each valve . . . and how
> carefully did they torque the head studs?  There's all sorts of little
> but critical things that need to be done with great care in assembling an
> aircraft engine and somehow I just don't have the confidence to trust
> that whoever assembles engines at the shop is taking the same care that I
> would in putting the engine together myself.
>
> That R-2300 looks to me like a wonderful engine - but it needs to be put
> together perfectly.  These engines get sold already assembled so if I
> bought one the first thing I'd do with it is get all the manuals and take
> the thing completely apart then put it back together, incorporating any
> improvements it might need.   As Jeff Scott has said, that needs to be
> done with any new and unknown engine.  Notice this engine is rated for
> continuous power of 80 HP at 3000 RPM.  Max RPM is 3200.  I really
> appreciate that this engine has been designed to operate at the perfect
> RPM for a VW.
>
> I haven't priced what an equivalently-equipped Great Plains engine costs
> these days but I imagine it'll work out about the same as what Joe wants
> for these R-2300 Revmasters.  GP appeals to me more because it is bought
> as a kit, so you KNOW how it's been put together.  Plus, parts are not
> proprietary.  Looks to me though that a lot more engineering has gone
> into the design of the R-2300 - rather than just increasing displacement.
>  I'm reading just now that GP's 2300 (actually 2276cc) is "optimized" to
> operate between 3200 and 3600 RPM.  Since I know 3200 is the very top of
> where I want to run my engine, both for prop tip mach speed issues and
> internal friction heat issues, I think I'd rather have an engine that's
> been engineered to operate at an RPM that will keep it cool and where it
> is most efficient.  I'd buy that R-2300, take it all apart and put an
> Ellison on it if I were choosing between the two.  It's gorgeous.
>
> Mike
> KSEE
>
>
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