From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Tuning
Date: Wed, 21 Oct 2020 14:37:31 +0800
References: <list-862004@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-862004@logan.com>
Message-Id: <FD52CD92-3C19-4C12-B899-7DB58595A8DD@gmail.com>

Thanks Lyn

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?

Cheers

Steve Izett=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=99s =
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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>=20
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