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03-20-2009, 02:29 PM
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Join Date: Sep 2006
Location: Manstad, Norway
Posts: 866
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What's the optimum values for CHT, EGT, oiltemp and oilpress on a IO-360?
Hi.
My Extreem IO-360 had just passed 50 troublefree hrs and is broken in.
Since I'm about to start X-country flying, I'm wondering what the optimum values for CHT, oiltemp and oilpress are?
I realize that the values can vary alot with powersetting, OAT etc, but I'm wondering if it's any numbers which are "better" for the engine than others?
For example:
Is CHT at 400'F better than 350?
Is oiltemp at 210 better than 180?
What is the ideal oilpress?
Is it any "ideal EGT" or will EGT just end up where it ends up after proper leaning?
Maybe this is a stupid question and maybe there's too many variables for a simple answer, but it'd nice to hear from you engine-experts out there...
Thanks.
__________________
Regards Alf Olav Frog / Norway
First RV-7 completed, (bought partly finished from a US-builder) 305 hrs per July 2014, SOLD
Second -7 had first flight Feb 25th 2014. 220 hrs pr July 2019. Life is good!
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03-20-2009, 02:54 PM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Hi Olav..
1. Both temps are OK.
2. Both temps are OK.
3. Around 75psi.
4. EGTs will vary with OAT and power settings...they are what they are.
Regards,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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03-20-2009, 05:01 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Quote:
Originally Posted by pierre smith
4. EGTs will vary with OAT and power settings...they are what they are.
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And will also vary with probe placement.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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03-20-2009, 07:33 PM
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Join Date: Jul 2008
Location: Santa Rosa, CA
Posts: 580
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TEMPS
What I personally like to see is;
400f CHT max hot day, hard climb, full rich.
325f CHT 65% pwr, lean at OAT 50f +or-
1650f EGT max, but at reduced power for cruise, 1450f
Oil temp min 170f and 220f max, but 180 to 190 is ideal
In cold weather (15f OAT) I only see a CHT of 265f or less. I think that is too cold. Also at the same OAT my oil runs 145f, that's way too cold. In the winter I almost totally block off my oil cooler and that helps. Now at the same OAT I run about 170f.
Steve Barnes the Builders Coach
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