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Date: Thu, 12 May 2005 12:16:27 -0400
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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: Plasma III on Hi Compression Engines


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Craig:

One thing you can do now is compare the TSIO-550 and it's operating=20
parameters to the TNIO-550 which has 8.5:1 CR.  The differences are=20
significant and address the issues you are asking about.  Lower TITs=20
and higher efficiency.  As a result, the TNIO-550 can be operated=20
continuously at higher power settings.  I routinely operate mine at=20
87-90% power, LOP.

Also, high CR engines will be much easier to operate when PRISM is=20
available so that the ICP/thetaPP issues are directly measured and the=20=

spark timing is altered accordingly in real time, rather than by a=20
look-up chart based on MP and RPM.  Since mixture plays such a=20
significant role in the EFFECTIVE timing, it is very helpful for it to=20=

be factored in.  Rather than trying to calculate the variables, why not=20=

just MEASURE the parameter that matters and adjust accordingly?

Walter


On May 12, 2005, at 10:24 AM, Craig Berland wrote:

"I put those two pieces of information together and reach the=20
conclusion that if there are ways to operate the engine at high power=20
but minimize the peak torsionals,=A0 then that method ought to be=20
used.=A0I=92m not sure I answered your question.=A0 If not, let me try =
again.=20
Regards,=A0 George"

Yes you did answer my question...thanks.=A0 One more.=A0 How much of a=20=

tight rope are we walking with the TSIO550 trying to balance peak=20
pressure and TIT?=A0 Well, two questions.=A0 I have discussed with some =
the=20
advisability of raising the compression ratio on the TSIO550 and I=20
advised against it. The quest for efficiency is outweighed by the quest=20=

for durability. What do you think?=A0 A similar question.=A0 Would you=20=

advise retarding the timing if Scot's engine was stock CR?=A0 Retard 2 =
to=20
3 deg's more=A0at 9 to 1 and 5 to 7 deg's more=A0at 10 to 1???=A0 If =
this is=20
so, then stock CR is the way to go. Finally let me say I believe there=20=

are lots of variables that affect engine durability like oil type and=20
viscosity, engine component balance and prop balance to name a few. So=20=

this is not a discussion on whether or not Scott or someone else should=20=

run a given CR. I'm trying to isolate and understand a given engine=20
calibration feature and I'm most interested in the TSIO550.

Craig Berland=

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Craig:


One thing you can do now is compare the TSIO-550 and it's operating
parameters to the TNIO-550 which has 8.5:1 CR.  The differences are
significant and address the issues you are asking about.  Lower TITs
and higher efficiency.  As a result, the TNIO-550 can be operated
continuously at higher power settings.  I routinely operate mine at
87-90% power, LOP.


Also, high CR engines will be much easier to operate when PRISM is
available so that the ICP/thetaPP issues are directly measured and the
spark timing is altered accordingly in real time, rather than by a
look-up chart based on MP and RPM.  Since mixture plays such a
significant role in the EFFECTIVE timing, it is very helpful for it to
be factored in.  Rather than trying to calculate the variables, why
not just MEASURE the parameter that matters and adjust accordingly?


Walter


On May 12, 2005, at 10:24 AM, Craig Berland wrote:


=
<italic><fontfamily><param>Arial</param><color><param>0000,0000,8080</para=
m><x-tad-bigger>"I
put those two pieces of information together and reach the conclusion
that if there are ways to operate the engine at high power but
minimize the peak torsionals,=A0 then that method ought to be used.=A0I=92=
m
not sure I answered your question.=A0 If not, let me try again.
Regards,=A0 George"</x-tad-bigger></color></fontfamily></italic>


=
<fontfamily><param>Arial</param><color><param>0000,0000,8080</param><x-tad=
-bigger>Yes
you did answer my question...thanks.=A0 One more.=A0 How much of a tight
rope are we walking with the TSIO550 trying to balance peak pressure
and TIT?=A0 Well, two questions.=A0 I have discussed with some the
advisability of raising the compression ratio on the TSIO550 and I
advised against it. The quest for efficiency is outweighed by the
quest for durability. What do you think?=A0 A similar question.=A0 Would
you advise retarding the timing if Scot's engine was stock CR?=A0 Retard
2 to 3 deg's more=A0at 9 to 1 and 5 to 7 deg's more=A0at 10 to 1???=A0 =
If
this is so, then stock CR is the way to go. Finally let me say I
believe there are lots of variables that affect engine durability like
oil type and viscosity, engine component balance and prop balance to
name a few. So this is not a discussion on whether or not Scott or
someone else should run a given CR. I'm trying to isolate and
understand a given engine calibration feature and I'm most interested
in the TSIO550.</x-tad-bigger></color></fontfamily>


=
<fontfamily><param>Arial</param><color><param>0000,0000,8080</param><x-tad=
-bigger>Craig
Berland</x-tad-bigger></color></fontfamily>=

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