VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics


Go Back   VAF Forums > RV Firewall Forward Section > Traditional Aircraft Engines
Register FAQ Members List Calendar Today's Posts

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 12-05-2011, 07:00 PM
rocketbob's Avatar
rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,564
Default

I don't agree with clearances being the only culprit because one can chrome cylinders to new specs on bore diameter, have the correct end gap and piston to cylinder wall clearances and they'll still use oil. But a chrome cylinder obviously has a different finish with very shallow peaks and valleys.
__________________

Please don't PM me! Email only!

Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
Reply With Quote
  #22  
Old 12-05-2011, 07:09 PM
LifeofReiley's Avatar
LifeofReiley LifeofReiley is offline
 
Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
Default

Quote:
Originally Posted by airtractor8 View Post
Hi Charlie

I have flown about 40hrs since fitting them and can only see a small reduction in consumption. They certainly didn't fix the problem totally. I think the cylinders are probably near the outer limits as mentioned in one of the previous posts. I will probably run them a while longer and change them out with new cylinders if consumption increases.
By chance do you know if your cylinders are tappered or straight bored? Also, a broken oil ring will cause oil blow by havoc...
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
Reply With Quote
  #23  
Old 12-05-2011, 07:26 PM
airtractor8 airtractor8 is online now
 
Join Date: Mar 2006
Location: Dardanup. Western Australia
Posts: 167
Default

Quote:
Originally Posted by LifeofReiley View Post
By chance do you know if your cylinders are tappered or straight bored? Also, a broken oil ring will cause oil blow by havoc...
They are Lycoming nitrited tapered bore. I guess it could have one or more broken oil rings but given that the consumption hasn't changed much since the second set of new rings was fitted I would have to be unlucky I think. Murfy says its certainly a possibility though.
Reply With Quote
  #24  
Old 12-05-2011, 07:29 PM
LifeofReiley's Avatar
LifeofReiley LifeofReiley is offline
 
Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
Default

Quote:
Originally Posted by airtractor8 View Post
They are Lycoming nitrited tapered bore. I guess it could have one or more broken oil rings but given that the consumption hasn't changed much since the second set of new rings was fitted I would have to be unlucky I think. Murfy says its certainly a possibility though.
My good friend had only one broken oil ring a couple of months ago and it just brings back memories when I read thru this thread. Maybe not...
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
Reply With Quote
  #25  
Old 12-05-2011, 08:18 PM
LifeofReiley's Avatar
LifeofReiley LifeofReiley is offline
 
Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
Default

Quote:
Originally Posted by airtractor8 View Post
They are Lycoming nitrited tapered bore. I guess it could have one or more broken oil rings but given that the consumption hasn't changed much since the second set of new rings was fitted I would have to be unlucky I think. Murfy says its certainly a possibility though.
Do you have the part # of the rings that were installed?
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
Reply With Quote
  #26  
Old 12-05-2011, 08:37 PM
airtractor8 airtractor8 is online now
 
Join Date: Mar 2006
Location: Dardanup. Western Australia
Posts: 167
Default

Quote:
Originally Posted by LifeofReiley View Post
Do you have the part # of the rings that were installed?
The first set were ECI the second and current set are genuine Lycoming. I don't have the part numbers near me at the moment.
Reply With Quote
  #27  
Old 12-06-2011, 05:35 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,213
Default H2AD/oil

Graham,
I am running an H2AD in my -4. I built the engine up myself, and have reconditioned cylinders on it. I did the first 50hrs with same oil you used,running 75% or higher throttle settings, and now run the 100 plus also. I have about 100hrs on it now, and it is using about 1/2 qt every 8-10 hrs. Like yourself, I never fill above 5 qts. I have heard all the recomendations for the valve stem seals also, but didnt put them on mine. Sounds like you have done all the right things, so I will be curious if you find a solution! Good luck.
__________________
Bill E.
RV-4/N76WE
8A7 / Advance NC
Reply With Quote
  #28  
Old 03-18-2014, 12:32 PM
TangoT TangoT is offline
 
Join Date: Mar 2014
Location: Florida
Posts: 2
Default How's the intake stems seals working?

Quote:
Originally Posted by mike in phx View Post
when i built my engine i have P10 new overhauled cylinders and 9.5-1 comp pistons total seal rings.
And when you use the rings it will puff smoke on idle.
Because of the added vacum, on intake stroke it pulls oil thru the guide.
So i added valve stem seals on exaust and intake valve. I have over 250
hours on valve stem seals and on the new turbo motor im using 1/4 quart oil on 35 hours.
If you need more info give me a call 602 697 4080
I'm wondering how this is working out? I have a Lyc IO-360-C1E6 that and considering doing the same. Any updates would be appreciated!
Reply With Quote
Reply



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 07:12 AM.


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.