From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: timing on renesis engines
Date: Tue, 9 Jul 2019 06:56:52 +0800
References: <list-12744763@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-12744763@logan.com>
Message-Id: <39F3D7D7-143E-4004-AFE2-E240914394A8@gmail.com>

So which MS document do we take as being the good oil for the LS2 coils. =
Is it 4.0mS or 3.5mS ?

Steve Izett

> On 9 Jul 2019, at 6:04 am, Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> That's an outdated page. I'm not sure why they even keep them alive.
> http://www.msextra.com/doc/pdf/MS3baseV30_Hardware-1.4.pdf
> Page 93
>=20
> Of course that number depends what voltage is consider at "nominal". =
Not sure if Tracy's changes value based on voltage or not. And RPM vs =
Manifold pressure
>=20
> =
https://www.miataturbo.net/diy-turbo-discussion-14/lsx-coil-thread-82744/p=
age8/#post1380088
>=20
>=20
>=20
> - Matt Boiteau
>> On 2019-07-08 11:58:11 AM, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>>=20
>> Matt,
>>=20
>> =20
>>=20
>> How did you end up with 3.5ms for the D585=E2=80=99s? At least one =
Megasquirt resource shows 4.0ms at 14VDC. My concern is the wide range =
between Tracy=E2=80=99s LS1 4.3ms and the 3.5ms referenced. If the =
megasqiurt information is correct then Tracy was very conservative with =
the LS1 settings.   4.0ms vs 5.6ms.
>>=20
>> =20
>>=20
>> =20
>>=20
>> http://www.megamanual.com/seq/coils.htm
>>=20
>> =20
>>=20
>> Bobby
>>=20
>> =20
>>=20
>> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20=

>> Sent: Friday, July 05, 2019 8:03 PM
>> To: Rotary motors in aircraft
>> Subject: [FlyRotary] Re: timing on renesis engines
>>=20
>> =20
>>=20
>> For the LS2 - D585 truck coils, 3.5ms is the recommended dwell.
>> =20
>>=20
>> =20
>>=20
>> - Matt Boiteau
>>=20
>> On 2019-07-05 7:37:10 PM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>>=20
>> Thanks Bobby and Lyn.=20
>>=20
>> According to Tracy=E2=80=99s code - 2.6 mSec RX8, 3.5 mSec RX7, 4.0 =
mSec LS2, 4.3 mSec LS1.=20
>> I also wondered about the timing difference between the various coils =
trigger circuit actually firing.=20
>> Now I suppose that difference might be a few uSec and insignificant, =
but if its 100uSec=20
>> then the timing difference between various coil types might become =
significant.=20
>>=20
>> @ 7000 RPM=20
>> 1 rev takes 8.6mSec=20
>> So each degree of EShaft rotation is 24uSec.=20
>>=20
>> Thanks again for the help.=20
>>=20
>> Steve=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> > On 6 Jul 2019, at 2:52 am, Bobby J. Hughes bhughes@qnsi.net wrote:=20=

>> >=20
>> > Lynn,=20
>> >=20
>> > Default is what ever Tracy set it to. The CAS location is not =
adjustable so default is set in his code.=20
>> >=20
>> > Bobby=20
>> >=20
>> > Sent from my iPhone=20
>> >=20
>> > On Jul 5, 2019, at 12:43 PM, lehanover lehanover@aol.com wrote:=20
>> >=20
>> >> What is the "Default" advance? Is that checked with a timing =
light? Easy starting can be up to 15 degrees of advance. For full power =
use up to 27 degrees of advance is good up to 10,500 RPM. Boosted =
engines require less advance as boost increases. Because the effective =
compression ratio as well as charge temperature is going up. Very high =
boost my have advance closer to zero. Advance is used to allow full =
combustion=20
>> >> of the charge before the exhaust port opens. At higher pressure =
and temps the flame front speeds are increasing. So, less time is =
needed. Thus less advance is needed. Lowering intake air temps with an =
inter-cooler and adding water spray can allow higher boost.=20
>> >>=20
>> >> Boosting to maintain sea level performance would probably not =
shorten engine life. Boosting for additional performance does shorten =
engine life. The kids get over 600 HP with boosted drag racing engines. =
This is fine if you only need the engine for 9 seconds. You have to know =
what the actual advance is to make any decision. Mark the flex plate or =
flywheel teeth with paint so you can check actual advance during any =
RPM.=20
>> >>=20
>> >>=20
>> >> It is difficult to detonate an NA engine. It is not difficult =
detonate a boosted engine.=20
>> >>=20
>> >> Lynn E. Hanover=20
>> >>=20
>> >>=20
>> >> In a message dated 7/5/2019 10:22:44 AM Eastern Standard Time, =
flyrotary@lancaironline.net writes:=20
>> >>=20
>> >> Steve,=20
>> >> I=E2=80=99m running default timing or maybe 1 degree advanced. =
Early on I experimented with 1-2 degrees advance for many flight hours =
and did not detect any noticeable change in engine performance. I did =
push the engine to what I believe was detonation during a ground tuning =
session. I was tuning under boost (44=E2=80=9D MP) , 7000 rpm with a =
wideband O2 on each runner and adjusting Mode 9 and Mode 4. With F/A =
balanced between each rotor and EGT=E2=80=99s under 1600F I was trying =
to see if increasing timing would lower EGT=E2=80=99s. F/A was in the =
11=E2=80=99s. This was at the end of the session and the engine and =
supercharger were already hot. I think I had added 4-5 degrees advance =
with no noticeable EGT decrease when I encountered a mild bang or =
misfire. This condition was well above my 38=E2=80=9D MP limit I =
sometimes use for takeoff.=20
>> >>=20
>> >> I=E2=80=99m curious about the dwell time setting difference =
between LS1 and LS2 coils. I switched to LS2 coils sometime back with no =
failures to date. I remember seeing an option setting in some of the =
code you or Finn posted. Internet research indicates LS2 coils require =
less dwell time than LS1. Possibly 0.5-1 ms less.=20
>> >>=20
>> >> Bobby=20
>> >>=20
>> >> Sent from my iPad=20
>> >>=20
>> >> > On Jul 5, 2019, at 12:58 AM, Stephen Izett =
stephen.izett@gmail.com wrote:=20
>> >> >=20
>> >> > Hi there Guys=20
>> >> >=20
>> >> > Of the guys with Renesis engines using EC2/3 can you comment on =
your timing settings.=20
>> >> > I=E2=80=99ve to date left the timing at the default setting =
figuring its set by the location of the CAS.=20
>> >> > Not sure if the various coil options have different trigger =
timing latency.=20
>> >> >=20
>> >> > Thanks=20
>> >> >=20
>> >> > Steve Izett=20
>> >> >=20
>> >> >=20
>> >> >=20
>> >> >=20
>> >> > --=20
>> >> > Homepage: http://www.flyrotary.com/=20
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>> >>=20
>> >> --=20
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>>=20
>>=20
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