Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Engine Reading in Cruise

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> RV10-List
View previous topic :: View next topic  
Author Message
Albert Gardner



Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
PostPosted: Sat May 03, 2008 6:02 pm    Post subject: Engine Reading in Cruise Reply with quote
I was talking to David McNeill on the phone about elevated CHT temps on cylinders 1 and 2 yesterday and mentioned that I had that problem also and was considering reducing the size of the air dams on those cylinders to improve temps. I told him I would post some instrument readings I had recorded about 2 weeks ago. Engine is IO-540 with 10:1 comp, 1 Lightspeed, Bendix servo, AeroComposites 3 blade prop.

Altitude: 2000 ft. OAT: 75F MP: 21” RPM: 2100 IAS: 128kt TAS: 140kt Leaned to 10.1 gph. Oil Temp: 203F
GHT 374 385 340 337 369 360
EGT 1398 1386 1382 1352 1390 1403
Albert Gardner
N991RV
Yuma, AZ

[quote][b]

- The Matronics RV10-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List

_________________
RV-9A N872RV
RV-10 N991RV
Back to top
View user's profile Send private message Send e-mail
n801bh(at)netzero.com
Guest
PostPosted: Sat May 03, 2008 8:14 pm    Post subject: Engine Reading in Cruise Reply with quote
Those look like some pretty good numbers to me.

do not archive
Ben Haas
N801BH
www.haaspowerair.com

-- "Albert Gardner" <ibspud(at)roadrunner.com> wrote:

I was talking to David McNeill on the phone about elevated CHT temps on cylinders 1 and 2 yesterday and mentioned that I had that problem also and was considering reducing the size of the air dams on those cylinders to improve temps. I told him I would post some instrument readings I had recorded about 2 weeks ago. Engine is IO-540 with 10:1 comp, 1 Lightspeed, Bendix servo, AeroComposites 3 blade prop.

Altitude: 2000 ft. OAT: 75F MP: 21” RPM: 2100 IAS: 128kt TAS: 140kt Leaned to 10.1 gph. Oil Temp: 203F
GHT 374 385  340 337 369 360
EGT 1398 1386 1382 1352 1390 1403
Albert Gardner
N991RV
Yuma, AZ

Quote:


====================================
http://www.matronics.com/Navigator?RV10-List
====================================
tronics.com
====================================
www.matronics.com/contribution
====================================



_____________________________________________________________
Click here to find singles for dating, romance and fun.
[quote][b]

- The Matronics RV10-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List
Back to top
billderou(at)yahoo.com
Guest
PostPosted: Sun May 04, 2008 11:18 am    Post subject: Engine Reading in Cruise Reply with quote
With your compression higher than my stock 8.5:1 some numbers may not compare but you are getting fairly good efficiency at 15.9 smpg. After I added a miles per gallon metric to my display and with some patience I now get 17.3 (or so) smpg at 180-185 smph with the mixture set to peak. I was surprised that you are doing this well with the 10:1 compression.

On the CHT readings: It seems for my engine the high CHT's settled down at 100-125 engine hours, also, I started cutting down the dams about this time. Working with two variables created a moving target. Now all my CHT's are within 25 degrees F. I think the goal would be to adjust the dam until the difference between cyl 1 & 3 is less than 25 degrees F and the same for cyl 2 & 4. Cyl 5 & 6 will get whatever cooling remains. If you eliminate the dams then on decent the front cylinders will cool very quickly.

The best advice I can give is make the dams easy to change so its convenient to modify them often. On my first dam change I drilled out the two rivets and replaced them with Tinnermans. The screw holes were tweaked such that the screw would slip between the fins. This allows the dam to be easily removed without touching the cowl.

As Ken Kruger told me - "sneak up on it". This was good advice.

Bill DeRouchey
N939SB, flying


Albert Gardner <ibspud(at)roadrunner.com> wrote:
[quote] I was talking to David McNeill on the phone about elevated CHT temps on cylinders 1 and 2 yesterday and mentioned that I had that problem also and was considering reducing the size of the air dams on those cylinders to improve temps. I told him I would post some instrument readings I had recorded about 2 weeks ago. Engine is IO-540 with 10:1 comp, 1 Lightspeed, Bendix servo, AeroComposites 3 blade prop.

Altitude: 2000 ft. OAT: 75F MP: 21” RPM: 2100 IAS: 128kt TAS: 140kt Leaned to 10.1 gph. Oil Temp: 203F
GHT 374 385 340 337 369 360
EGT 1398 1386 1382 1352 1390 1403

- The Matronics RV10-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> RV10-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group