From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Tuning
Date: Wed, 21 Oct 2020 22:19:08 +0800
References: <list-863045@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-863045@logan.com>
Message-Id: <A7E0925C-DE9D-47B0-8070-24E02CE4A2AF@gmail.com>

Hi Matt

With OAT at 21C 70F Cowl Flaps open I pull back power at about 1500 =
feet, Oil peeks at 110C 230F and H2O at 100C 212F
30in2 air into Water cooling and 9in2 into Oil Cooler. Makes sense given =
the inlet area into the Oil Cooler is low therefore the target of about =
15in2.
I instrumented the H2O rad and probably 20% of the cooler has zero or =
negative pressure inside the diffuser.=20
So hoping that mods to the H2O diffuser and significantly more air to =
the Oil cooler will bring both those numbers down to peek at 210F on a =
hot day and=20
close the Cowl flaps and cruise at around 175F.

Steve


> On 21 Oct 2020, at 9:22 pm, Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Steve, what are your temps? In Florida, with outside being 90-95F I =
can taxi all day long without overheating. On takeoff, I have to =
throttle back after 1 to 1.5mins because my oil pan gets to 230F. =
Coolant out is around 215F.=20
>=20
> Cruising around at ~3000ft, 80F OAT @ 2250prop rpm. Oil settles to =
215-220F, coolant 185-190F. Maybe 140kts.

>=20
> My plane is slower and eats more gas to a comparable lycoming. Usually =
they cruise at 180kts @ 8gph. I'm sitting at 168kts @ 18gph (not =
verified yet). Haven't been past 5000ft yet to see the performance =
numbers. I know my cowl needs a good redesign, intake probably doesn't =
flow the best, oil cooler is too small, prop may be off. But so far, not =
too impressed with the engine. I highly doubt the P-Port intake RX8 is =
anywhere near 250hp like Paul said.
>=20
> I'll have pics/videos soon (this weekend) of plane and flight data, so =
you'll see what I'm dealing with.
>=20
>=20
> - Matt Boiteau
>=20
>=20
> On Wed, Oct 21, 2020 at 2:38 AM Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Thanks Lyn
>=20
> So PP=E2=80=99ing a Renesis 4 port provide significantly better =
breathing.=20
> Is there a porting option for the Renesis 4 port that yields =
significant improvement, say 10% hp or is there too little material to =
play with?
>=20
> Cheers
>=20
> Steve Izett=20
>=20
>=20
>=20
> > On 21 Oct 2020, at 9:35 am, lehanover lehanover@aol.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > A Periphery ported side exhaust is better than both intake and =
exhaust being periphery ported. Neither the intake or exhaust port ever =
closes. So, there is exhaust dilution of the intake flow based on the =
amount of exhaust back pressure. Up to the point where RPMs do not allow =
enough time for this to occur.Then it sort of steps up on the cam and =
the power comes on as if by an electric switch. The full periphery =
engine tunes like a dirt bike.  The intake length and diameter and the =
exhaust length and diameter tune like a trombone.=20
> > A periphery ported 12-A can do 310 HP at 10,000 RPM. A 13-B can do =
330 HP at 10,000 RPM. We have to be under 105Db at 50 feet at full =
throttle. The Renesis has zero overlap. But it had a Micky Mouse intake =
with 2 different tuned lengths.=20
> > There was a builder at Sun&Fun years ago who had a RX-7 transmission =
for speed reduction. It worked fine. Later he had the idle too slow and =
it shook the gears of of 2nd gear. I forgot his name but he died of =
cancer.
> > LEH
> > In a message dated 10/20/2020 5:35:49 PM Atlantic Standard Time, =
flyrotary@lancaironline.net writes:
> > =20
> > Mat,
> >=20
> >             It will only idle hot at that rpm. (1800).  Cold it is =
2000 plus.  Yes P ported and the advance seems to vary little from 20 =
degrees.  Running Fueltech ECU. And running cheapest gas.=20
> >=20
> > Neil.
> >=20
> > =20
> > From: Rotary motors in aircraft <flyrotary@lancaironline.net>=20
> > Sent: Wednesday, October 21, 2020 1:38 AM
> > To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> > Subject: [FlyRotary] Re: Tuning
> >=20
> > =20
> > Steve =3D Using Megasquirt for ECU. How is your flight testing =
going?
> >=20
> > Jeff =3D I meant prop rpm. Using Neil's PSRU, which is 3.17. I just =
bumped up my idle to around 800prop (2500engine). I forgot to add, I am =
P-Port which causes a need for higher idle.=20
> >=20
> > Lynn =3D Idle can be that high? Usually I see rotary idle around the =
10-18 range, but that is for a car. Little different with a prop on 100% =
of the time.
> >=20
> > =20
> > Neil =3D That is a nice idle. I forget, are you P-Port? What is your =
timing at?
> >=20
> > Dave =3D 35 all time? Doesn't that seem really high for rotary. Pump =
gas? Lynn was saying 24 degrees for 87 octane.
> >=20
> >=20
> > - Matt Boiteau
> >=20
> > =20
> > =20
> > On Mon, Oct 19, 2020 at 12:11 AM Stephen Izett =
stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
> >=20
> > Hi there Matt and all
> >=20
> > What computer is controlling your fuel and spark Matt?
> >=20
> > Ive left the timing of the EC2 on the Renesis 4 port at Tracy=E2=80=99=
s default and haven=E2=80=99t changed it but was wanting to do some =
experimenting.
> > I take it that the timing setting in the EC2/3 will vary the whole =
timing curve over the rpm/load envelope.
> >=20
> > Cheers
> >=20
> > Steve Izett
> > Renesis 4 port EC2 EM3 RD1-C
> >=20
> >=20
> >=20
> >=20
> > > On 19 Oct 2020, at 10:21 am, Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
> > >=20
> > > Split table.
> > >=20
> > > - Matt Boiteau
> > >=20
> > >=20
> > > On Sun, Oct 18, 2020 at 10:17 PM Matt Boiteau =
mattboiteau@gmail.com <flyrotary@lancaironline.net> wrote:
> > >=20
> > > What AFR and timing are people running for idle, taxi, takeoff, =
climb, cruise, descent?=20
> > >=20
> > > idle =3D 11afr, 20 timing
> > > I seem to have to be around 11afr for it to stay alive. Still =
trying to get it to idle around 600rpm, maybe bump it up to 700rpm to be =
smoother without dieing and shaking apart.=20
> > >=20
> > > taxi / takeoff / climb =3D 13.2afr, 28 timing
> > >=20
> > > cruise - not sure aft, 28 timing
> > >=20
> > > decent - not sure aft, 32 timing
> > > Not sure what the plane likes. I tried 14afr, but the MAP really =
get's low and engine shakes. Guessing it should be more rich?
> > >=20
> > > I attached the timing table and split rotary table (second email). =
Not sure how to tune timing, I just want safe values for now.
> > >=20
> > >=20
> > > - Matt Boiteau
> > > --
> > > Homepage:  http://www.flyrotary.com/
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