|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

10-11-2011, 07:36 PM
|
|
|
|
Join Date: Jul 2008
Location: Shreveport, LA
Posts: 46
|
|
CHT's and EGT's in 9 with IO-320
Pardon this post if the answer appears elsewhere but I was not able to find the answer searching other threads.
We (meaning me and my other builders) just cranked our IO-320 for the first time in our 9A. And since I am the only pilot of the group (at present) I, of course, must complete the POH.
The Lycoming book on my IO-320 says CHT's should not exceed 435 degrees. However, one of my old sage instructors who is anal about these things said that even though the book list 435, there are those who fret over CHT's in excess of 400.
Of course, the Lycoming book is "gospel" for my engine, but I also know that CHT's with any given engine will be different based on the aircraft in which it is installed, and then any peculiarities of the particular aircraft (such as the baffling.)
So, what I want to know is, with properly fabricated baffles, what sort of CHT's should I expect with my IO-320 on initial climb, cruise climb, cruise, descent, etc? I don't want to list 435 as the red line for CHT's if, in a typical RV-9A installation, most of you guys are getting climb CHT's of 400 or so.
Any information is, of course, greatly appreciated.
|

10-11-2011, 08:10 PM
|
 |
|
|
Join Date: Nov 2006
Location: West Chester, PA
Posts: 689
|
|
Depends
My IO320 runs about 390 on hottest cylinder on initial climb on a hot day (2000DA). Level off and it drops to 325 or so. On a cooler day, it goes no more than 375 on climb. Runs a little hotter after I had my fuel servo adjusted to a leaner mid range.
__________________
Mark
RV-9A; Sold 
RV-14A; Building
2020 =VAF= donor
|

10-12-2011, 04:52 AM
|
 |
|
|
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
|
|
Use Lycoming's numbers.
Hugo, you'd do well to list Lycoming's numbers in the POH, for all temps and pressures.
You don't want to list 400 deg and then, next summer, happen to see 405 on a prolonged climbout. If you have a 'glass' panel, program the redline to Lyc's specs....there's already a built-in safety margin.
Best,
__________________
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!
|

10-12-2011, 08:47 AM
|
 |
|
|
Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
|
|
Pierre +1.
There are margins built into any engineering numbers. Use them accordingly.
|

10-12-2011, 09:58 AM
|
 |
|
|
Join Date: Jan 2008
Location: KTCY
Posts: 643
|
|
Quote:
Originally Posted by dahugo
The Lycoming book on my IO-320 says CHT's should not exceed 435 degrees.
|
Are you sure that it doesn't say Max. CHT 500 deg?
The manual for the O-320 says (expect that the IO-320 is the same):
Never exceed the maximum red line cylinder head temperature limit.
For maximum service life, cylinder head temperatures should be maintained below 435°F
(224°C) during high performance cruise operation and below 400°F (205°C) for economy
cruise powers."
We set the Dynons yellow at 430 and red at 450 max is 500 for the O-320.
__________________
Dave & Trina
RV-9A Flying  - 330 Hrs. Painted  Finishing the interior.
Last edited by MauiLvrs : 10-12-2011 at 10:21 AM.
|

10-12-2011, 10:04 AM
|
|
|
|
Join Date: Jan 2006
Location: Belgium
Posts: 645
|
|
max 500? F
Thats what my manual says!
Regards Pilottonny.
__________________
"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
|

10-13-2011, 03:55 AM
|
|
|
|
Join Date: Sep 2010
Location: Sao Paulo, Brasil
Posts: 72
|
|
Never exseed is 500
Absolute Max is 500 RED
Avoid from 450 on Yellow
Max Power Cruise 435 still in the Green
Normal Cruise 400 Green
Resume: Green 0 to 450
Jellow 450 to 500
RED 500 to 550
So, climbing on a very hot day is OK to see 435
Healthy cruise below 400. Best between 350 and 380 !!!
Last edited by bignose : 10-13-2011 at 04:05 AM.
|

10-16-2011, 03:33 AM
|
 |
|
|
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
|
|
Here we go, about to start a big fight here. And heck I do not care......I am a long way away  but lets be real here.
Lycoming set a max CHT which is a book figure, but go do some research on the strength properties of aluminium alloys. Start thinking about this with a bit of scientific thought.
Now I would suggest that your green range be up to 380, Yellow 380 to 420, and red over 420.
Yes before any of you get carried away with "but I live in Texas".......BS, I live in Qld, and I fly around northern Australia, no different.
I never see climb temps above 380-385 and cruise between 295 and 335, maybe 340 on the hotest of days. The IO540 is just a IO-360 x 1.5 so no big difference.
Sure you can "set" you numbers where you like, but trust me, I may just be speaing from a better informed position  .
If I saw CHT's in the 460+ range I would be really worried 
|

10-16-2011, 05:09 AM
|
 |
|
|
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
|
|
Agreed..
Quote:
Originally Posted by RV10inOz
If I saw CHT's in the 460+ range I would be really worried 
|
Me too, but that wasn't the original poster's question, now was it?  It's a full moon and I don't wanna fight either
Best,
__________________
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!
|

10-16-2011, 08:29 PM
|
 |
|
|
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
|
|
Pierre....You are afunny fellow

|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 06:51 AM.
|