VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-12
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 06-07-2018, 03:56 PM
DonFromTX's Avatar
DonFromTX DonFromTX is offline
 
Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,771
Default

I have, often on auto and tractor engines. The open valve face tends to pick up some oxidation, which allows for some leakage. I have never pulled a Rotax head but would suspect the same there. Try running a compression check on a Lycoming that has sat for a time, same effect. Compression comes up after even a short run.
.
Quote:
Originally Posted by EXflyer View Post
Why would the valves not seat? Have never seen that on any auto engines that I have worked on.
__________________
A&P, PP-SEL, Pathological Flier, EAA Technical Counselor
EAA Chapter 595 President,http://www.595.eaachapter.org/index.htm
Retired US Army Officer
Reply With Quote
  #12  
Old 06-07-2018, 04:00 PM
DonFromTX's Avatar
DonFromTX DonFromTX is offline
 
Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,771
Default

You might be right there, had not thought about it much actually.

Quote:
Originally Posted by Piper J3 View Post
I think the reference was to lifter bodies pumping up with air if oil not purged correctly. You'd have to draw air into oil pump/pressure galleries.
__________________
A&P, PP-SEL, Pathological Flier, EAA Technical Counselor
EAA Chapter 595 President,http://www.595.eaachapter.org/index.htm
Retired US Army Officer
Reply With Quote
  #13  
Old 06-11-2018, 01:37 PM
rv7boy's Avatar
rv7boy rv7boy is offline
Forum Peruser
 
Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,354
Default

Jim, and others, you might be interested in reading this article on the Rainbow Aviation web site.
__________________
Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/APRS Automatic Position Reporting System

ďCertainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard


"It should be added that the sublime beauty of the facture brings within the realm of discourse the substructure of critical thinking. " -using Doug's Art Critique jargon link and my birthday, I get this!
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 04:22 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.