Fogging oil

[Bruce Tuncks]

Only recently have I heard of this stuff. You are supposed to spray it into the carby just before shutting down and then into each cylinder.

Does anybody use this? where do you get it from?

[onetrack]

It's a favourite amongst the boaties. The website below tells you where you can purchase it. Whitworths are a pretty good marine supplier, but you won't find them away from the coast.

(EDIT: - just checked Whitworths website, they don't appear to stock it. AutoOne do).

 

https://www.sta-bil.com.au/products/sta-bil-marine-fogging-oil

[facthunter]

How does it get into your rocker boxes and all the other places ? . Anything one does, helps. especially with steel cylinders and to a lesser extent Cast iron which is pretty rare being only on Volkswagen Chev aircooled some motorcycle and Franklins.. Nikasil don't rust ( and chromed ones , But they are now fairly RARE,). Nev

[onetrack]

Fogging oil doesn't get into rocker boxes unless you pull the covers off and squirt in there. Cylinder bores and rings are pretty critical areas - rockers, not so critical.

Nearly all corrosion in rocker boxes is on the rocker arms and pushrods, not a huge problem that will see you fall out of the sky. The rocker shaft and ball studs have an oil coating that should protect them for 3 mths.

[facthunter]

Well to be a little more specific ,plenty of camshafts LOBES and followers fail too, and they have oil on them. The PLUS in W-100 plus is for that especially where the camshafts are at the top of the crankcase where the water condenses IF the engine isn't fully warmed up.. Nev

[onetrack]

Nev - Agreed. But a camshaft lobe failure, or a follower failure, is still not as dangerous or immediately destructive as a failure in the piston/ring/valve/bore area.

[facthunter]

Yes the rust can totally pug up the top ring and break ring lands. Nev

[Mike Gearon]

I googled fogging problems in boats just for the hell of it. Wouldn’t call it conclusive.... let’s go with interesting. Big difference when your boat conks out on departure and somebody tows you in or you start the 4hp backup to get back home.

 

Here is a procedure others seemed to agree with.

 

‘Spraying it through the spark plug holes is not the way to fog an engine. It has to be running and you fog it until it almost stalls then throw a big rag over the carb to stall it. That way it coats the intake, valves and cylinders. Been doing it for years on the boat engines. Never had a problem’

https://www.yellowbullet.com/threads/dont-think-ill-ever-use-fogging-oil-again-anybody-else-have-problems.2030033/

[mkennard]

I googled fogging problems in boats just for the hell of it. Wouldn’t call it conclusive.... let’s go with interesting. Big difference when your boat conks out on departure and somebody tows you in or you start the 4hp backup to get back home.

 

Here is a procedure others seemed to agree with.

 

‘Spraying it through the spark plug holes is not the way to fog an engine. It has to be running and you fog it until it almost stalls then throw a big rag over the carb to stall it. That way it coats the intake, valves and cylinders. Been doing it for years on the boat engines. Never had a problem’

https://www.yellowbullet.com/threads/dont-think-ill-ever-use-fogging-oil-again-anybody-else-have-problems.2030033/

Is the big difference a propellor in the way?

[Mike Gearon]

Is the big difference a propellor in the way?

Yes. ☺️ I’ve missed the bloody obvious yet again. I guess you’d get somebody who wants to use their arm one last time to throw the rag at air intake.

[Mike Gearon]

Today. I’ll forget motors and stick with trying to extract the PVC stuck screw from an extruder barrel with a Ukulele heater pad. Not going any better and it’s 1950’s tech with no help from YouTube. Gas torch tomorrow.