From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: First successful RV-4 Renesis engine run
Date: Tue, 9 Jun 2020 10:05:54 +0800
References: <list-348124@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-348124@logan.com>
Message-Id: <78D40F2C-A50C-4637-B756-CAAFB1E582AB@gmail.com>

Hi Finn

We were returning fuel from the Fuel rail with the secondary injectors =
fed by ~8 inch hoses from the rail.
I changed this in order to install a Fuel Flow Transducer so shifted the =
regulator to the firewall where fuel returned to the header tank.=20
So from the firewall forward we are returnless with the flow transducer =
and insulated fine fuel filter above the engine just before the fuel =
rail.

We=E2=80=99ve not had any issue with fuel vapour locking. Our rail =
pressure us about 50psi.

Steve Izett=20


> On 9 Jun 2020, at 8:56 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>=20
> Yep.Except the next run pressing that button didn't do anything. But =
did go smooth.
> Third run today couldn't get it to run smooth (didn't try hard).
>=20
> When does shift from rough to smooth, RPM goes up and get a more =
continuous sound. When rough it's almost as if it doesn't fire half the =
time, yet mixture monitor shows close to ideal. Weird!
>=20
> So still a mystery. Stuck seal? Air in fuel?
> I have a returnless system. Regulator just after fuel pumps, returning =
directly to tank. 3/8" alum tube 3' to firewall, then a 3/8" EFI hose to =
a Standard filter sitting on top of engine and from there 5/16" EFI hose =
to Tee to primary and secondary fuel rails. Pressure sender at end of =
secondary fuel rail (where the damper normally sits). After the first =
run where I got up to operating temps, I could hear fuel boil after =
shutdown. Tracy is also using a returnless system in his RV-8, so it can =
be made to work. However, I may need to move the fuel filter into the =
fuselage so it doesn't get heated by the engine. Of course if the prop =
was on it would cool some.
>=20
> Finn
>=20
> On 6/8/2020 7:44 PM, Stephen Izett stephen.izett@gmail.com wrote:
>> Progress Finn.
>> Must have been encouraging the it went smooth!
>>=20
>> Cheers
>>=20
>> Steve
>>=20
>>> On 9 Jun 2020, at 12:26 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>>>=20
>>> I fixed the engine monitor so it now shows RPM. Had been running it =
at real low RPMs. Still, very rough.
>>>=20
>>> Happened to press button 3 (Cancel) on the EM3 (not EC3) and engine =
started running smoothly (tested up to about 3,000 PRM). Still without =
prop.
>>>=20
>>> Could be a coincidence, will have to let engine cool down and try =
again. But first time out of 5 or more runs where it started running =
smoothly.
>>>=20
>>> Now I need to fix an oil lead at filter adapter and move exhaust =
pipe away from bottom of fuselage so it doesn't melt it and perhaps put =
on a prop.
>>>=20
>>> Finn
>>>=20
>>>=20
>>> --
>>> Homepage:  http://www.flyrotary.com/
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http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
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>>=20
>=20
>=20
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