VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-10
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 08-26-2015, 08:03 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 7,924
Default

Quote:
Originally Posted by BillL View Post
Edit: This is a fundamental engine design issue. The temps caused coking that caused the guides to wear, so they improved the wear resistance of the guides, now they stick because the root cause remains. The root cause is the guide wall temperature is too high. Running LOP, cooler EGTs, and CHT's will certainly help, if not eliminate, the sticking. The challenge will be the break-in conditions. Cool ambients and leaning will help to the point that CHT and cooling is not compromised.
Group...does field experience suggest angle valve engines exhibit less valve sticking?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #22  
Old 08-26-2015, 09:46 AM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,565
Default

Dan, after working on a few hundred lycs and contis, I'm not sur if I remember sticking on ANY angle valves of either brand.
__________________
Actual repeat offender.
Reply With Quote
  #23  
Old 08-26-2015, 10:26 AM
Plummit's Avatar
Plummit Plummit is offline
 
Join Date: Apr 2010
Location: SoCal
Posts: 715
Default

Wow this has been some really valuable information, and something I want to look in to regarding my engine. My understanding is that my engine came from Vans, then was sent to BPE for them to work their magic. Records indicate that they re-worked the engine and installed 9:1 pistons, with a HP boost to somewhere around 285.

Currently the engine has just over 200 hobbs hours, and we notice an occasional miss and roughness. The engine also seems to run smoother when hot.

~Marc
__________________
RV-10
N814RV
2018 Donation made!

Last edited by Plummit : 08-26-2015 at 06:41 PM.
Reply With Quote
  #24  
Old 08-26-2015, 10:50 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,324
Default

Quote:
Originally Posted by Plummit View Post
I never run LOP. Typically I try for 50 ROP,
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #25  
Old 08-26-2015, 11:13 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 7,924
Default

Quote:
Originally Posted by Plummit View Post
Typically I try for 50 ROP, but have had a couple of overheat issues if I try climbing out on a hot day and don't do a good job of maintaining the airspeed at 130 kts.
I don't believe I'da toll 'em that.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #26  
Old 08-26-2015, 12:00 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,520
Default

Quote:
Originally Posted by aerhed View Post
Dan, after working on a few hundred lycs and contis, I'm not sur if I remember sticking on ANY angle valves of either brand.
Well - this certainly puts the angle valve in a more favorable light.
__________________
Bill

RV-7
1st Flight 1-27-18
Phase II 8-3-18
Reply With Quote
  #27  
Old 08-29-2015, 08:30 PM
Bill.Peyton's Avatar
Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,649
Default

FWIW I did verify today that I have the newer valve guides with the "circle C" stamped on the head.
__________________
Bill Peyton
RV-10 - 875 Hrs
First Flight Oct 2012
WA0SYV
Aviation Partners, LLC
Reply With Quote
  #28  
Old 08-29-2015, 10:07 PM
miyu1975's Avatar
miyu1975 miyu1975 is offline
 
Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,037
Default

I can speak to one angle valve that stuck a valve.
__________________
Ryan Allen, CFII

RV 7 N612RA
E-170/175
Reply With Quote
  #29  
Old 08-30-2015, 08:09 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 7,924
Default

Quote:
Originally Posted by miyu1975 View Post
I can speak to one angle valve that stuck a valve.
Of course, the next question would be "What vintage angle valve?"....old or new valve guide material?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #30  
Old 08-30-2015, 09:22 AM
Bill.Peyton's Avatar
Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,649
Default

Dan,
In my case the newer valve guides didn't really make much of a difference. I have 400+ hours on the engine and still had a slight build up. In my case, I attribute this to the excessive oil consumption during break-in and for the first 50 hours or so. In addition, my number 5 cylinder would routinely get up to 400 on climb out. I now have redesigned the rear baffle plate to allow for better airflow and no longer have the issue to the same extent. Cylinder 5 was also the tightest guide clearance. In all cases, my front two cylinders run 10-15 deg. cooler than the rest. When I passed the reamer through the front two cylinders they were clear and had full clearance.
I did a climb test yesterday to verify one more time, that my issue was indeed a sticking valve. I kept the CHT's just under 390 all the way up to 7K feet at full power with no issues. I normally would not climb at full power, or best angle.
__________________
Bill Peyton
RV-10 - 875 Hrs
First Flight Oct 2012
WA0SYV
Aviation Partners, LLC
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:48 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.