[cf-drg]

There was an article published recently by some guy in Fly RC about fully cowled engines.. What I was wondering is how some of you get after run oil in an engine that is fully cowled? On my Enya's they have a breather tube (and nipple) between the 2 bearings.. So you can put a piece of tubing on it and squirt the oil through it.. But OS and Saitos are not so easy, what do you do?

[Ken E]

Been flying heli's and planes for23 years, never used after run oil, never had a engine failure.

[Max]

OS and Saito still have a breather tube, its just in the rear. Either way, your breather tube should extend outside the cowl. In that case you still run the after run oil into it, but you need to let the plane sit on its nose so that the oil seeps into the bearings..

The way I store my planes means that they are hung in a nose down position anyway, so that ensures the oil stay in the engine and not dribbling all over the fuse. Just a word of caution- If you leave the plane on its nose for a bit, the oil will seep out the front bearings and down the propshaft/spinner, so make sure you park it somewhere where you can wipe off the oil, or put a bag or something similar under the nose. Dont leave the plane parked on the missus white carpet or else...LOL

Also, like ken says here:

Originally Posted by Ken E

Been flying heli's and planes for23 years, never used after run oil, never had a engine failure.

Some of the better fuels don't need after-run. Remember, its the nitro that attracts moisture and causes the bearings to rust. Get into the habit at the end of the day's flying by emptying the tank, put the throttle to low power (in other words, not full closed) then attaching a glow driver and blipping the motor with the starter a few times. Even after it starts and sputters out, do this a few more times to make sure its run out all the fuel. Doing this will burn off all the remaining nitro in the crankcase and only leave the oil behind.

I do it this way as well and I hardly ever use after-run. I nly use it on motors that will be unused for prolonged periods of time.

[AJCoholic]

Originally Posted by Max

OS and Saito still have a breather tube, its just in the rear.

Not completely true Max - the newest line of O.S. 4 strokes, the Alpha line, has no breather. The oil recirculates within the engine... VERY clean, and excellent lubrication to all moving parts internally.

I have run a few of them, and they are probably my favourite 4 strokes to date.

AJC

[vinver]

[QUOTE=Also, like ken says here:


Some of the better fuels don't need after-run. Remember, its the nitro that attracts moisture and causes the bearings to rust. Get into the habit at the end of the day's flying by emptying the tank, put the throttle to low power (in other words, not full closed) then attaching a glow driver and blipping the motor with the starter a few times. Even after it starts and sputters out, do this a few more times to make sure its run out all the fuel. Doing this will burn off all the remaining nitro in the crankcase and only leave the oil behind.

I do it this way as well and I hardly ever use after-run. I nly use it on motors that will be unused for prolonged periods of time.[/QUOTE]

It's actually the methanol that absorbs moisture- and regardless of nitromethane content of the fuel, fuel left in the engine will absorb moisture.
Vince

[Ken E]

Probably a reason I have never had problems is my hobby shop is away from the house and is well sealed and insulated and electrically heated, no moisture. I think that you guys that are using your basements for your shop may find that moisture can be a problem, moisture in the air will be attacted to the methenol fuel. In these cases after run oil might be a good idea. ken

[wymbly1971]

Hey Darren,

I have a Saito 82 (inverted) in my Norseman. The breather nipple is just aft of the front bearing. I have added a piece of silicone tubing that curves around the engine and dumps just aft of the cowl.

After running, I flip the plane over, put a few drops of ATF in the tube and then stand it on its nose so the oil eventually gets to the bearing.

It's not much, but I also run her dry after a day of flying. Over extended periods of time (last winter), I yanked the rocker covers and threw a few drops down the pushrod tubes as well.