From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Fri, 05 Jul 2019 21:03:14 -0400
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Subject: Re: [FlyRotary] Re: timing on renesis engines
To: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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For the LS2 -=C2=A0D585 truck coils, 3.5ms is the recommended dwell.
=C2=A0

- Matt Boiteau
On 2019-07-05 7:37:10 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@=
lancaironline.net> wrote:
Thanks Bobby and Lyn.

According to Tracy=E2=80=99s code - 2.6 mSec RX8, 3.5 mSec RX7, 4.0 mSec LS=
2, 4.3 mSec LS1.
I also wondered about the timing difference between the various coils trigg=
er circuit actually firing.
Now I suppose that difference might be a few uSec and insignificant, but if=
 its 100uSec
then the timing difference between various coil types might become signific=
ant.

@ 7000 RPM
1 rev takes 8.6mSec
So each degree of EShaft rotation is 24uSec.

Thanks again for the help.

Steve


> On 6 Jul 2019, at 2:52 am, Bobby J. Hughes bhughes@qnsi.net wrote:
>
> Lynn,
>
> Default is what ever Tracy set it to. The CAS location is not adjustable =
so default is set in his code.
>
> Bobby
>
> Sent from my iPhone
>
> On Jul 5, 2019, at 12:43 PM, lehanover lehanover@aol.com wrote:
>
>> 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 d=
egrees of advance is good up to 10,500 RPM. Boosted engines require less ad=
vance as boost increases. Because the effective compression ratio as well a=
s charge temperature is going up. Very high boost my have advance closer to=
 zero. Advance is used to allow full combustion
>> of the charge before the exhaust port opens. At higher pressure and temp=
s 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 addi=
ng water spray can allow higher boost.
>>
>> Boosting to maintain sea level performance would probably not shorten en=
gine life. Boosting for additional performance does shorten engine life. Th=
e kids get over 600 HP with boosted drag racing engines. This is fine if yo=
u only need the engine for 9 seconds. You have to know what the actual adva=
nce is to make any decision. Mark the flex plate or flywheel teeth with pai=
nt so you can check actual advance during any RPM.
>>
>>
>> It is difficult to detonate an NA engine. It is not difficult detonate a=
 boosted engine.
>>
>> Lynn E. Hanover
>>
>>
>> In a message dated 7/5/2019 10:22:44 AM Eastern Standard Time, flyrotary=
@lancaironline.net writes:
>>
>> Steve,
>> 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 d=
etect 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 E=
GT=E2=80=99s under 1600F I was trying to see if increasing timing would low=
er EGT=E2=80=99s. F/A was in the 11=E2=80=99s. This was at the end of the s=
ession and the engine and supercharger were already hot. I think I had adde=
d 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.
>>
>> 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 da=
te. I remember seeing an option setting in some of the code you or Finn pos=
ted. Internet research indicates LS2 coils require less dwell time than LS1=
. Possibly 0.5-1 ms less.
>>
>> Bobby
>>
>> Sent from my iPad
>>
>> > On Jul 5, 2019, at 12:58 AM, Stephen Izett stephen.izett@gmail.com wro=
te:
>> >
>> > Hi there Guys
>> >
>> > Of the guys with Renesis engines using EC2/3 can you comment on your t=
iming settings.
>> > I=E2=80=99ve to date left the timing at the default setting figuring i=
ts set by the location of the CAS.
>> > Not sure if the various coil options have different trigger timing lat=
ency.
>> >
>> > Thanks
>> >
>> > Steve Izett
>> >
>> >
>> >
>> >
>> > --
>> > Homepage: http://www.flyrotary.com/
>> > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Li=
st.html
>>
>> --
>> Homepage: http://www.flyrotary.com/
>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List=
.html


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<body><div id=3D"__MailbirdStyleContent" style=3D"font-size: 10pt;font-fami=
ly: Arial;color: #000000">
                                        For the LS2 -&nbsp;D585 truck coils=
, 3.5ms is the recommended dwell.<br>&nbsp;<div><br></div><div class=3D"mb_=
sig">- Matt Boiteau</div><blockquote class=3D"history_container" type=3D"ci=
te" style=3D"border-left-style:solid;border-width:1px; margin-top:20px; mar=
gin-left:0px;padding-left:10px;">
                        <p style=3D"color: #AAAAAA; margin-top: 10px;">On 2=
019-07-05 7:37:10 PM, Stephen Izett stephen.izett@gmail.com &lt;flyrotary@l=
ancaironline.net&gt; wrote:</p><div style=3D"font-family:Arial,Helvetica,sa=
ns-serif">Thanks Bobby and Lyn.=0D<br>=0D<br>According to Tracy=E2=80=99s c=
ode -  2.6 mSec RX8, 3.5 mSec RX7, 4.0 mSec LS2, 4.3 mSec LS1.=0D<br>I also=
 wondered about the timing difference between the various coils trigger cir=
cuit actually firing.=0D<br>Now I suppose that difference might be a few uS=
ec and insignificant, but if its 100uSec =0D<br>then the timing difference =
between various coil types might become significant.=0D<br>=0D<br>@ 7000 RP=
M =0D<br>1 rev takes 8.6mSec=0D<br>So each degree of EShaft rotation is 24u=
Sec.=0D<br>=0D<br>Thanks again for the help.=0D<br>=0D<br>Steve=0D<br>=0D<b=
r>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>=0D<br>> On 6 Jul 2019, at 2:52 am, Bo=
bby J. Hughes bhughes@qnsi.net <flyrotary@lancaironline.net> wrote:=0D<br>>=
 =0D<br>> Lynn,=0D<br>> =0D<br>> Default is what ever Tracy set it to. The =
CAS location is not adjustable so default is set in his code. =0D<br>> =0D<=
br>> Bobby=0D<br>> =0D<br>> Sent from my iPhone=0D<br>> =0D<br>> On Jul 5, =
2019, at 12:43 PM, lehanover lehanover@aol.com <flyrotary@lancaironline.net=
> wrote:=0D<br>> =0D<br>>> What is the "Default" advance? Is that checked w=
ith a timing light? Easy starting can be up to 15 degrees of advance. For f=
ull 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 com=
pression ratio as well as charge temperature is going up. Very high boost m=
y have advance closer to zero. Advance is used to allow full combustion=0D<=
br>>> of the charge before the exhaust port opens. At higher pressure and t=
emps the flame front speeds are increasing. So, less time is needed. Thus l=
ess advance is needed. Lowering intake air temps with an inter-cooler and a=
dding water spray can allow higher boost.=0D<br>>> =0D<br>>> Boosting to ma=
intain sea level performance would probably not shorten engine life. Boosti=
ng for additional performance does shorten engine life. The kids get over 6=
00 HP with boosted drag racing engines. This is fine if you only need the e=
ngine for 9 seconds. You have to know what the actual advance is to make an=
y decision.  Mark the flex plate or flywheel teeth with paint so you can ch=
eck actual advance during any RPM.=0D<br>>> =0D<br>>> =0D<br>>> It is diffi=
cult to detonate an NA engine. It is not difficult detonate a boosted engin=
e.=0D<br>>> =0D<br>>> Lynn E. Hanover=0D<br>>> =0D<br>>> =0D<br>>> In a mes=
sage dated 7/5/2019 10:22:44 AM Eastern Standard Time, flyrotary@lancaironl=
ine.net writes:=0D<br>>> =0D<br>>> Steve,=0D<br>>> I=E2=80=99m running defa=
ult timing or maybe 1 degree advanced. Early on I experimented with 1-2 deg=
rees 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 detonat=
ion during a ground tuning session. I was tuning under boost (44=E2=80=9D M=
P) , 7000 rpm with a wideband O2 on each runner and adjusting Mode 9 and Mo=
de 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 i=
n the 11=E2=80=99s. This was at the end of the session and the engine and s=
upercharger 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 takeof=
f.=0D<br>>> =0D<br>>> I=E2=80=99m curious about the dwell time setting diff=
erence between LS1 and LS2 coils. I switched to LS2 coils sometime back wit=
h no failures to date. I remember seeing an option setting in some of the c=
ode you or Finn posted. Internet research indicates LS2 coils require less =
dwell time than LS1. Possibly 0.5-1 ms less.=0D<br>>> =0D<br>>> Bobby=0D<br=
>>> =0D<br>>> Sent from my iPad=0D<br>>> =0D<br>>> > On Jul 5, 2019, at 12:=
58 AM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> =
wrote:=0D<br>>> >=0D<br>>> > Hi there Guys=0D<br>>> >=0D<br>>> > Of the guy=
s with Renesis engines using EC2/3 can you comment on your timing settings.=
=0D<br>>> > I=E2=80=99ve to date left the timing at the default setting fig=
uring its set by the location of the CAS.=0D<br>>> > Not sure if the variou=
s coil options have different trigger timing latency.=0D<br>>> >=0D<br>>> >=
 Thanks=0D<br>>> >=0D<br>>> > Steve Izett=0D<br>>> >=0D<br>>> >=0D<br>>> >=
=0D<br>>> >=0D<br>>> > --=0D<br>>> > Homepage:  http://www.flyrotary.com/=
=0D<br>>> > Archive and UnSub:  http://mail.lancaironline.net:81/lists/flyr=
otary/List.html=0D<br>>> =0D<br>>> --=0D<br>>> Homepage:  http://www.flyrot=
ary.com/=0D<br>>> Archive and UnSub:  http://mail.lancaironline.net:81/list=
s/flyrotary/List.html=0D<br>=0D<br>=0D<br>--=0D<br>Homepage:  http://www.fl=
yrotary.com/=0D<br>Archive and UnSub:   http://mail.lancaironline.net:81/li=
sts/flyrotary/List.html=0D<br></flyrotary@lancaironline.net></flyrotary@lan=
caironline.net></flyrotary@lancaironline.net></div></blockquote>
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