<div style="margin: 0in 0in 10pt">Just got my first 4-stroke - A Saito 82 for my Ultra Stick.</div><div style="margin: 0in 0in 10pt"></div><div style="margin: 0in 0in 10pt">I didn't really know what to do with the crankcase vent line so it ran it to exit just below the firewall.As I'm running a little supplemental castor oil in 15% fuel, and I'm running the engine extra rich for break in, the entire bottom of the plane was heavily coated.I decided to route the vent line to exit near the exhaust outlet in an attempt to use the exhaust to carry some of the vent oil away.



Will this work or is there a better way?</div>

I wouldn't recommend the setup in your photo. Iwould suggest using a length of brass fuel tubing through the hole in the motor mount that a nose wheel would normally go and run your vent tubing to it. The crankcase has to breath and breathing through a short straw is easier than through a garden hose.

I"m not sure you are going to accomplish much in the way of a clean plane with either setup though. The exhaust is going to pump a ton of oil out no mater where the vent is. That is the bulk of the oil you are seeing with your first setup. The vent line does spit out oil, but not like the exhaust does. Once the engine gets broken in, and you get to a better tune, the amount of oil will drop, but not go away. It will be less than a two stroke engine of a like size but it's still there.

Good choice of engine I might add. It will treat you will.

Don

on my 150 i tapped the header and put a fuel fitting(nipple) on it and ran the vent to it.....it really smokes now[8D]

Intake or exhaust? O.S and some Magnums are running the vent into the intake. That seams to work well.

Don</p>

I used a set up similar to yours in your photo all last summer and it worked just fine. I did use a piece of larger size aluminum tubing for the last couple of inches that was attached to the muffler and out in the exhaust stream.
Once your engine is well run in and you lean the low end as much as possible the vent oil will be much less. I believe it to be beneficial to your engine to keep the vent line as short as possible. I would not think plumbing it into the muffler would work as the exhaust pressure in the muffler would be higher than the pressure in the vent line.
Fred

</p><div style="margin: 0in 0in 10pt">Thanks for the replies all.I too was thinking, "If only there was a second nipple on the muffler," but didn't reason through the problem in that the exhaust pressure would defeat the purpose of venting the case.I'm also not happy with the length of the tubing as is and will go back to venting below the firewall.This time though with a short length of metal tubing to extend an inch or so below the fuse.I think I will run this setup for one flying outing just to see the difference in oil residue distribution.</div>

I run my crankcase vent down the exhaust...I use a brass tube where the vent line would come into contact with the hot exhaust pipe....and silicon to get it outside the airplane....secured in place with tye wraps.....

exhaust...

yes the new magnums are different now... i havent tried one yet

yea I have two magnums a 70 and 120 and both crank vents connect into the intake, no mess, works great