Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Old 04-26-2020, 01:05 PM
rv8or rv8or is offline
Join Date: Oct 2007
Location: Norwich England
Posts: 162
Default Inverted Systems

This is a fairly old report that I came across today and it rang home with me.

I have had to rebuild my RV 3 engine due to corrosion issues in the crankshaft.
The engine is a O-235-F2B of 125 hp with an inverted system.
The first maintenance task a week after purchase was to pull the engine to repair a crack in the engine mount. It was quite a surprise when I undid the down pipe from the Tee piece of the inverted system to find it was full of water. After the engine mount repair I undid this hose at every 25 hour oil change and it was usually fairly full of water. At the next annual I pulled the crankshaft plug and found the crankshaft was beyond repair.
My opinion and only my opinion is that the metal Tee piece is acting like a condenser and dropping water down the inverted pick up hose.

My type of flying is only occasionally sportsman aeros usually +ve G. If the aircraft had been flown in hard aero's then this would not be so much of a problem.
For my flying I removed the inverted system to stop moisture build up.

So my advice is if you have a inverted system remove the drain pipe at every oil change to remove the water.

L4 Cub Share
RV8 in very very slow build
Reply With Quote

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 05:28 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.